Latheboy's toy - GSXR750 Turbo fuckun

[latheboy]

Thanks guys i'm digging it. I love making shit for the bike that you can't buy.

It's 6mm polycarbonate.

I don't know what to do with it now, put it back on or leave it in the house so i can look at it :D

Maybe the bike should come inside.

[rod185651]

Nothing I write can communicate how impressive that is.

[Watto]

thats a piece of art mate

[rock hard]

quote:Originally posted by latheboy

Thanks guys i'm digging it. I love making shit for the bike that you can't buy.

thats a good feelin for sure Ivan,but this plenum realy is beautiful

[mr.zxr]

That plenum is trick. you've spent some time on that, and imo it's time well spent.

[latheboy]

All up i think there's about 20 hours in the 7 parts to make the plenum.

I was thinking about put one of these stickers in the window.
http://www.creepyuncle.com.au/#
Zombies or the stripper.

[latheboy]

Time of an update.
I blew the gear box again and almost went under a bus because of it, that was exciting.
When i rebuilt it the first time i missed the wear on the shift drum and it was jumping out of 2nd.

Oldskool worded me up as to the problem and i got some new parts in the mail.
Deano helped out with a couple of gears too, so with a week to go until the drags she looked like this.
http://i1226.photobucket.com/albums/ee405/latheboy179/P1000763.jpg

I got it back together and running and did a AFR check on the dyno, all good so a drag racing we shall go:D

That shit is so much fun, best was 11.35 @ 120mph.
I need to harden up abit of the line, but with a few people asking if my gear box would make it i was a bit soft. Fuck you TK.
Looks like this at the moment and Gibbo has given me a cool idea for the paint.

http://www.streetfighters.com.au/attachment.php?attachmentid=186&d=1323068911 (http://www.streetfighters.com.au/attachment.php?attachmentid=186&d=1323068911)

http://www.streetfighters.com.au/attachment.php?attachmentid=197&d=1323069567

Power is 130HP at the wheel, i started with 92/94 at the wheel.
http://i1226.photobucket.com/albums/ee405/latheboy179/GSXR750TAFRVsHP.jpg

I'm getting 40HP from 7PSI with only retarding the ignition and about $1000 in parts.
The theory is 1 bar (14.7PSI) will double your power, so 7PSI should be 45HP. Close enough i reckon.
I have tuned it with EGT's in each exhaust port and a AFR meter so i could tune each carby. The 4 carb's have different jets and needle settings to get the afr right, I could lean it off a bit but being a oil cooled motor i'm happier keeping the cylinder temps down.
When i first tuned it i had the interia set up wrong on the dyno (4wd Dyno), thats why it says more power in the last graph.

I also did a graph at 5PSI just to see the difference.
http://i1226.photobucket.com/albums/ee405/latheboy179/5PSIvs7PSI.jpg

[BANDITROD]

That's all kinds of awesome ivan I love it give yourself a slap on the back mate ...not a pat a slap cos it's more hardcore

[Yella]

Nice work. love this build

[Fight_fan]

Fuckin rad dude! I dig it. Well done!

[slingy88]

Hi Latheboy,

Just read your thread through. Mate WOW. You do some AWESOME work Bud, your now officially my hero.

Hey, we ort to start the turbo gsxr750 SSSA owners club,(thats what all the cool kids are doing) only where ever we went i'd have to hide mine under a sheet, because like Yella so ellequently put it, mine looks like a TURD in comparison.

Love all the one off machined parts, keep it up

Your motor the 749cc looking at the clutch cover or is it a 748cc short stroke?


:D

[latheboy]

Thanks nigga's ...

It's the big block slingy, 749 it is.. none of this small block 748 shit ;)

We could start our own forum and everything haha ... Turd is a bit harsh i think, i dig both Yella's and your bike.. Something to do with the homebuilt turbo i reckon... RAD

[slingy88]

Thanks nigga's ...

It's the big block slingy, 749 it is.. none of this small block 748 shit ;)

We could start our own forum and everything haha ... Turd is a bit harsh i think, i dig both Yella's and your bike.. Something to do with the homebuilt turbo i reckon... RAD

All right, all right, no need to rub it in.

Anyway, mines 813cc, so who's is bigger than who's now.;)

All hail homebuilt turbo's.:cool:

[slingy88]

Mate, just wondered what spec, or at least what AR your T28 turbo is? Your dyno graphs look real good for such a large turbo, and i'm just gathering info for a possible upgrade to mine in the future.

Cheers

Slingy

[RevHead]

Nothing I write can communicate how impressive that is.

+1 on Rods statement

[latheboy]

I thought the turbo was off a fully sick skyline but EXBEN told me it's off a Silvia so it's a bit ghey.
A/R.42 on the compressure and .48 on the zaust side

Thanks Pete

[slingy88]

Cheers :D

[Deano]

I would have said skyline cause I thought Silvia's had .64&.60 ar t25 on the s13 .64&.60 in a t28 on the s14 and the same again for the s15 except ball bearing (gt28r or gt2560r)

[latheboy]

Maybe i heard wrong, wouldn't be the first time....

Cool as, the bike is a bit more fully sick again...

[EXBEN]

It's my understanding that the .48 was used on the 180sx silvias using the CA18 motor, I'm just going by what I've been told as I don't use these turbos.

[Deano]

I have one of those ca18 turbos here. Came off my bike before I went to the gt28r

They are in the t25 frame (only a circlip holding the comp cover on) and have the 3 bolt outlet where Ivan's is the 2 bolt outlet in a t28 frame ( should have 4 or 5 bolts holding the comp cover on).

I think that's how it works anyway

[latheboy]

Yup it's a T28 and it has 6 bolts for the comp cover and same for zaust side.

It's the best daily bike ever, but seeing as i've been riding it i cant call it a streetfighter anymore;)

[Deano]

Sounds like you have a commuter bike now

[Booster]

The little t28 like yours Ivan was often part of a pair on a twin turbo setup
they were not known for reliability when turned up in there std fitment, but if not pushed they last a long time, and spool real fast with super light ceramic exhaust side

[ozzy1100]

all the ceramic exh factory turbos dont like over 1 bar boost (14.7psi) from what have been told over the yrs is that tubine
is sort of guled and pressed onto the shaft and have a habit of spining of with the extra temp at over a bar. this btw is just rule of tumb and just what i have been told over the yrs.

[BANDITROD]

i have heard the same lynton

[latheboy]

New headlights, brackets are rough as bro but it gets them mounted were I want them for the moment.
I'll be remaking them with a cover or the top.

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0015.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0012.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0011.jpg

[xa-mont]

that's a cool different approach. how is that for legality?

I'de probably want both for low/high though so that you don't have a huge black spot on the opposite side of the low beam.

[latheboy]

how is that for legality?



Yes.

I haven't had it out in the dark yet, but anything is better than shitty downlights

[kiwi kdx]

I love this thing!!!!
Lights look awesome there mate.

[hooligan]

the lights look fucking cool, and so does smiley the psychotic button.

[hyofighter]

thumbs up for the lights , the whole out side the box thing and that

[BANDITROD]

thats cool ivan you fag

[El_Hefty]

yep original is good, roadworthy? I guess depends on who certs it?

[80s freak]

Well there goes that idea I've had in my head for ages. It looks as good as I thought it would. As far as roadworthy, technically it wouldn't pass because the light is obstructed from view on the opposite side.
but I doubt you'd get pinged for it.

[latheboy]

Gibbo said the other day about the roady issue, i might mount one of the light up with the brackets the other way so the lights are more forward.

I need the Smiley, it tells me to do bad things

[Tony Nitrous]

Great thread.
Great build.
Excellent.
Love it.

[drewboy]

The headlights do look great there, very original. Instead of moving them forward, maybe a low beam on each side, and a highbeam in the middle would work. Could maybe squeeze the highbeam projector under the bottom triple clamp?? Nice work so far!

[latheboy]

No, no lights in the middle.
I've wanted to run a race plate for ages for the nice clean look infront of the froks.

The lights are off a fully sick madass sach thingy and have the magic E mark which is a first for my bike:D

Didn't move the lights i got drunk instead, got to have a think about the possition froward or back.

Thanks guys, I build what I want and try to be different

[Yella]

Love the race plate look.

[Iceman]

Ivan, you have always been different. I guess that's why we like you.

Lights looks cool mate.

[latheboy]

We, it's been in bits again but back together today.

Fucking shit 23 year old needle and seats give it in.

number 1 carb was dripping the other week so i ripped the carbs off and the runner was FULL of fuel.
Oil smelled of fuel too.... Dump the oil and put some new shit in, fucked around with carbs and them number 3 did the same thing FUUUUUUUUU!!!!!!

anyway i got new parts and then had fueling problems with number 1 again. more FUUUUUUUUU!!!!!

I somehow moved the float height and it wasn't fueling..... all back together and good.
Will have to put it on the dyno to make sure its ok...

I think i'll write a letter to Mr. Suzuki to tell him how "very very angry i am with you" 23 years ffs...
Now that its running i can take it to work and fininsh the headlight covers...

[latheboy]

Been a while with not much done, made some headlight covers and a LED front running light under the plate.

Tuning is all good, I have mapped fuel pressure against boost and there is more fuel pressure all the time.
Haven't turned the boost up yet so still 130HP at the wheel

Just need to make a new dash then paint the it, not too keen as it means I have to clean it...

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0224_zps40675971.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0222_zps507c2f22.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0221_zps9129247e.jpg

[BANDITROD]

looking good ivan i like the headlight set up it looks great

[ozzy1100]

i was just thinking the same thing rod lol
the race card and flat profile on the forks is just horn
but i wish this bike wasnt sssa imo :-)

[latheboy]

Thanks Rod.

Really ozzy? What don't you like about it?
Is it the shitty rattle can paint? The fact I haven't cleaned it in over a year? Or just the shitty standard wheel?

I had been looking at a late model gix swinger a while ago but haven't thought about it much.

Also I've got a wog chrome front guard coming in the mail, should look a bit nicer.

[ozzy1100]

lol like i said just imo cause i really like what u are doing and this is one of my fav bikes here atm
i just have never taken to sssa's, there are some bikes i have seen that it really works on(robmacs blade comes to mind)
but most it just seems there is some thing about them that unballance the look of the bike from the side
yr bike has that great squat tuff racey stance at the front that goes so wel with the light option and engineering then opens up and looks all washed out and soft on one side at the back, all this is subjective i mean i think a dirty zephyr is sexy lol
btw if u want a busa arm russ has had mine up on ebay a few times

[ozzy1100]

btw chome is for chap wearing ass pirates..............
and those mirrors are not to bad for the price are they :-)

[latheboy]

Far enough ozzy, ill pass on the swing tho.

Mirrors are great, $30 or $40 ... I broke one and didn't care, just get some more...

[Redmohawk]

I love sssa on most bikes , this one not at the moment. Earlyer in your build it looked more "in place" now the front end has more going it doesnt seem to fit in my minds eye. I dont find it unpleasant , just doesnt seem to flow with the rest of the bike in its current shape.

I do love the front end now , I've always been a fan of your bike. The lights/covers and the race plate all just seem to work just right, hiding the lights at the sides a stroke of off the wall intelligence.

[BANDITROD]

wog chrome is carbon fibre ozzy

btw chome is for chap wearing ass pirates..............
and those mirrors are not to bad for the price are they :-)

[latheboy]

Fuck you cunts, I spent a few hours last night looking at swingers, then looked at swing arms ;)

I don't normally give a shit about what other people think but i must have had doubt about it already.

It is a fighter I guess and ever evolving.

[ozzy1100]

wog chrome is carbon fibre ozzy
Lol shows how much I know
And yer those mirrors I did the same riding around yard pissed :-)

[mr.zxr]

I fell kinda like a lebonese ass pirate. i have a polished frame and carbon fibre..:o I know it was a 90's thing but is it really that bad. those were the days i had a head full of hair and was getting laid every weekend.... i just don't want to let go.

[RevHead]

It is a fighter I guess and ever evolving.

so farkin true!

[slingy88]

Not being biased but i luv your bike latheboy. Awsome , no nonesense, used daily fighter. Thats what they're supposed to be about arnt they.
The ssa looks great. There is alot going on up front now but you'd have to go all pimped 300 section rear end to compete with it which would be wrong as well. Carry on with it and see. Could change the wheel to a car rim with more metal to fill it out more or even paint with changing colours from front to back to alter the what catches the eye etc.
Anyway mate, its your bike so you just keep doing what makes you happy with it.

[slingy88]

Oh and whats your steering damper off?

[latheboy]

Yeah i'm keeping the SSSA i dig it.
I have a plan for the wheels.

It's an Öhlins SD, got it with the bike.

Don't worry mr.zxr, I still pump out Poisons greatest in times of need

[latheboy]

Clutch is back together, I went for a cruise on a private road to see if I could get it to slip.
It seems fine on 9PSI and hitting the limiter in 1st and 2nd, I run out of private road.

http://i1226.photobucket.com/albums/ee405/latheboy179/HPVsPSIgreenisfuel.jpg

Green is fuel pressure and red is boost.

This is when I fucked it up.

http://i1226.photobucket.com/albums/ee405/latheboy179/opps.jpg

The blue run is from ME putting the wastegate controller on backwards so it was a dead end, wastegate stayed shut.
The clutch didn't slip on this Blue run, i shut it down when i saw the boost line going North... Clutch played up afterwards
Before the turbo my bike made 94/96 HP.... And not such a low RPM, in 10KPH on the graph i've gone from 6PSI to 10 and a bit.
If I run it all the way and the motor didn't let go, she would have been a monster.:D

[ozzy1100]

would have been one hell on a run till some thing when pop lol
love the top run where you can see how well the riseing rate reg works with fuel preasure in a blow though system

[latheboy]

She started to hum that's for sure, I almost broke my wrist shutting it down.

Blow through is the way forward.

I'll stick to that theory until I build an injected bike anyway;)

[ozzy1100]

hahaha lol mind you a few yrs ago i would have said you are mad it will run but be a pig and a pain in ass to tune but more and more i see of what and the like are doing it looks like worth a try

[ALBI]

Bit of an update to the shitter.

I want to be able to see all the work i put into the plenum so here is Plenum cover MK3

Still needs a polish and the o-rings put in.

http://i1226.photobucket.com/albums/ee405/latheboy179/Newcover.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/Newcover4.jpg
hmmm you have given me an idea hmmmm

[latheboy]

I'm lucky that I build Dyno's for a living Ozzy, tuning was not really an issue just alot of dyno time. Free for me.
I did tune each cylinder so there are different jets and needle heights in each carb, most tuners would not do that.
You should do it tho :)

Abli.
I used polycarbonate for the cover, after talking to a plastics guy today i'm not sure if I'll keep the window.

I have bad stains on the inside from standoff/ reversion and it looks shithouse.

Copy paste
"Reversion is the flow of the air fuel mixture out of the cylinder and into back into the intake manifold."

When petrol comes into contact with polycarb it changes it into perspex, which is brittle.
So I won't be suprised if it cracks.

Next option is glass if I'm to keep to window, I haven't looked into this yet.

Another option is to make 50 windows and replace them as they look shit. Not really too keen on that either.

[ALBI]

HMM YES I SEE my clear clutch cover went to shit and stained so i redid it with new polycarb again.

by the way im going to use just 1 turbo at the moe as i already have good s hand gt 1543 freelander turbo and an intrcooler etc so im going to run that to learn etc and get timming set up that way i can do set up for penuts lol then if happy then go to twin s

[Deano]

you are better off starting with the correct turbo. if you use a turbo cause its free and then build everything to suit it, when you find out it wont do the job you have to remake everything plus you have to buy the correc turbo.

it is a fiddly job doing it once let alone twice on the same bike after you weren't happy with the first effort. the turbo is the heart of the system if you start with a good base you will get a better end result.

and there is no such thing as a 'cheap turbo bike' think of a figure and double it, now double it again. now you are getting close.

[ozzy1100]

that Plenum is dead set sexy mate
atm im just trying to design a simple lifting bike/fixture table out of 1/2 plate, 100 rhs and 75 rhs and am fast finding that
making shit work is a dam site harder than just makeing shit......
so i can only imagine the time and grey hairs it cost to design and build some like that best with only the resorces at your disposal.

and if you so happen to make better dyno's though their use and your better understanding of them who are they to complane :-)

i have found a wideband data logger in the states ... it logs o2, egt, map, air temp, oil temp, oil press, fuel press, rpm and shaft rpm all this with wifi to any thing with net as a active web page dash and with sensors but only 1 egt sensors costing about $550............and the extra egt can be had for a bit more.
scotty of rapid motion(TOP BLOKE) is the man building my motor and has basicly said its so easy using old sckool tuing methods on the set up and tune ill be useing that i wouldnt need to spend the money and make things more complex than they need to be,
but fuck me thats cool mmmnnnnn set over all o2 then cross reff 4egts at diff loads and rpm takeing into account other variables till you have the over all best out come...........
love yr work

[ozzy1100]

you are better off starting with the correct turbo. if you use a turbo cause its free and then build everything to suit it, when you find out it wont do the job you have to remake everything plus you have to buy the correc turbo.

it is a fiddly job doing it once let alone twice on the same bike after you weren't happy with the first effort. the turbo is the heart of the system if you start with a good base you will get a better end result.

and there is no such thing as a 'cheap turbo bike' think of a figure and double it, now double it again. now you are getting close.

what this man said
yes there are some great 2nd hand turbos off cars that will be perfect in some cases but you need at shit load of understanding that best comes form exp to know when and where so if cost a real prob it can be done well
but is just so easy to buy what you need and in a lot of cases ends up costing close to the same with half the sore head it becomes a very temping option

[latheboy]

I was lucky enough to get a defect notice on my bike for NO mud guard/ refector.

Could have been a $382 fine but the cop was nice to me.

I had to make it all pretty and legal for Vicroads.
Looked like this...........GHEY.....

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0017_zpsa775bf89.jpg

Now that was never going to last so as per the other thread regarding the mud guard, I did this.

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0019_zpsbac62baf.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0022_zps67bc7e47.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0021_zps9d98c04c.jpg

http://i1226.photobucket.com/albums/ee405/latheboy179/IMAG0020_zpsa202bc29.jpg

Red is because ...... Fuck I never told Vicroads I changed the colour. Fixing that now so i can cover it in bewbies and clear coat.

Latest new part is the carbon front guard off a KTM RC8.

[rod185651]

I actually don't mind the number plate position, and if it .stops you getting yellow stickers bonus.

[hooligan]

I like it too,
i want to do it to my vfr at some stage. How solid is it? does it shake and vibrate, ie, do you think it'll crack?

[latheboy]

It's nice and stable, although I haven't had a look at it while riding.
I think it'll get a little shake going from bumps and vibations.

My welds don't crack :D

[ALBI]

It's nice and stable, although I haven't had a look at it while riding.
I think it'll get a little shake going from bumps and vibations.

My welds don't crack :D
FARK YOU MATE!!!!!

im doing the same deal with my number plate, well i was ! farkkkk kin hellllllll lol.

[latheboy]

FARK YOU MATE!!!!!

im doing the same deal with my number plate, well i was ! farkkkk kin hellllllll lol.

You should still do it, all the kool kids are mounting them that way.;)

[Large]

Meh.

That's so 2008, like the one I had on the Spondon.

[hooligan]

That's why i asked about the cracking, actually. I remeber you saying you had trouble with yours.

[Large]

Yeah cracked a few times.

Ivan prolly wont be doing 1 oclock whoolies like I used to tho'

[latheboy]

Ha... I think you're right Mr. Large

[hooligan]

If he ate more pies he could bulk up to put more weight over the back end.

[BANDITROD]

looking good ivan its about time you painted that thing i like the new paint scheme

[Azrael]

How did go getting a turbo'd bike over the pits? I mean getting the defect off? Theyre kinda picky about that shit here, as much as they like to pick on fender eliminators, but when cops see turbos they think its christmas..

[latheboy]

When i got pulled over it was for the no mud guard/refector.

The cop didn't see the turbo until I had the notice in my hand and was about to leave.

He stood there and pointed at it with his thinking face on, didn't say anything just walked away.

When I was at Vicroads, I pushed it into the pits and the lady asked me what I had changed.
I pointed at the mud guard and she said ok.

That was it. Probably lucky she didn't know what she was looking at.

[latheboy]

looking good ivan its about time you painted that thing i like the new paint scheme

I'm not sure about the paint yet, I kinda like the rough as guts paint.... Still keeping in that theme tho, rattle canned it and you can see runs and the black still coming through haha

Ideally I want to buy a heap of stick mags and cut out all the bewbies, glue the pics on and clear over the top :cool:

Don't know how that will fly with the fuzz tho....

[BANDITROD]

hahahaha that would be awesome

[K6Thou]

I'm not sure about the paint yet, I kinda like the rough as guts paint.... Still keeping in that theme tho, rattle canned it and you can see runs and the black still coming through haha

Ideally I want to buy a heap of sick mags and cut out all the goatse, glue the pics on and clear over the top :cool:

Don't know how that will fly with the fuzz tho....

Fixed.

:p

[latheboy]

Ha ... That will be on the under tray ...

[latheboy]

Bit of an update.....

Been running really good for a long time on 9PSI
Went to a bike show on the weekend (border bike fest) and set up the dyno.
Put my bike on just to do a couple of power runs and make sure all is good for the show.
Bloody thing was coming on super strong and kept spinning the wheel.
Since I've changed the undertray in the last month I now don't have anywhere good to tie it down so can't get correct down force.
It also felt like it was boosting a bit odd.
It coughed high in the RPM so I just shut it down and parked it.
Anyway I had a bit of a look today and pulled the wastegate apart.
Found this!!!!!

http://i1226.photobucket.com/albums/ee405/latheboy179/Wastegate Diaphragm_zps8i0rr8op.jpg

The Diaphragm is rooted and letting the boost control signal past so it's not opening....
My fuel pump is good for 22PSI and when it coughed it was running out of fuel....
Sooooooooooooooo, I was running more than 22PSI of boost and it didn't blow up .. pretty happy seeing as she's over 90K on the motor.
New Wastegate and I better put some MORE PSSSSST in it:)

[ozzy1100]

Fuck lol

[Gix11]

It's a GSXR mate, what did you expect?!

[latheboy]

Yeah, I should know better by now Si... It is the big block 749cc not the shit box 748cc, so should handle a lot more than that :)

[xa-mont]

should be able to run a safe 20psi then ;)

[latheboy]

Not quite, I need more than 3PSI of fuel pressure than boost.... 19PSI should be ok :)

I want to run 15PSI just so I can say, Ive got a bar haha

[xa-mont]

I want to run 15PSI just so I can say, Ive got a bar haha

HAHA that's as good a reason as any.

[BANDITROD]

holy shit ......so how much power did it make at 22psi

[hooligan]

imagine if it was a man sized 1100....

[latheboy]

imagine if it was a man sized 1100....
Ahaha... get fucked :)

Don't know how many hp's, I can't tie it down now with the subframe change.
I'm making some tie down brackets at the moment while I'm waiting on a new wastegate.
I'll run it at 9PSI to make sure it's ok then i'll get excited :)

http://i1226.photobucket.com/albums/ee405/latheboy179/HPVsPSIgreenisfuel.jpg

Old power graph here, the solid line (without dots) is the power.
Where it crosses 115 km/h it's making 80HP and it rolls over, well the latest one doesn't lean over ... it just keeps going north from there and breaks loose.

[latheboy]

7 year update.
Went drag racing cause I'm a racist now..
Stripped 3 threads on the cam journals so the oil got out of the rocker cover . Boo went home and cried myself to sleep with Jen stroking my hair.
Next day I had a plan, made some bridges and fix that problem.
Next issue, SSSA is too short.
No problem anymore.
9030
96 SRAD swingarm
Because RAD and cheap ..
Werd

[oldskool]

I love it x

[latheboy]

So the bridge.
I had some parts laser cut at work and busted out the mill.
Cracky Mccracky
9031
9032
9033

[Neo Dutch]

;)