Which Fuel injection management for turbo

[Issues]

I have a cafe project. Gonig to change motor out for a GSX750 16v TSCC engine my brother gave me. I have a GT2871 and GT2876 to choose from. Posably going to bore out the 750 to 800+cc. With intercooler and shit would like it to be 200+whp.

I have been advised to run Autronic or Stinger EMS. What would some of the veterans here recomend?

The project bike.
http://i452.photobucket.com/albums/qq246/nastytroll/xn85.jpg

[Booster]

An original old Zook turbo ... i'm gunna cry if you cut that up ... Resto it

I think the 2871 would be a very big turbo for a tscc 750 motor, a 2860 would give better throttle response and still make 200hp easily, something like the nissan gtir 2860,(320hp) it has a slightly bigger exhaust side which is generally the choke point on the 2860's if you push them hard .but even the 280hp versions will do great on the 750.
Cheap and simple engine management would be a Microtech LT4 or LT10 , setup for fuel only and triggering off the coil negative
No stuffing around with cam and crank sensors , std ign map is fine to at least 15 psi , i'm still running std ign curve on my 750 at 30 psi, but using good fuel & water inj to controll detonation at that level.

[Deano]

They are big turbos as Greg said.

For me Autronic sm4 all the way. Wouldn't touch anything else

[Issues]

The bike T boned a pedestrian about 10 years ago or more so most of the panels are bent, cracked or missing. The appeal of a leagal turbo cafe was worth the little I paid for it. My google research says there were 1153 of these bikes made world wide and parts would not be that easy to find for a resto. Good condition XN85's have sold for $2000-$4000.

Thanks Booster, I was a little worried about the ignition for the 750 being a problem. I already had the 2 garrets here, I can mock it up with the 2871 and bolt in a 2860 when the time comes. Do you have any recomendatons for cam and engine internals, comp ratio and such?

The bike has been sitting under a tarp in a paddock for around 9 years, the previous owner had cut the wiring harnes to get it running but that was 6 years ago. When we picked it up the back wheen wouldn't turn from the seized chain. I have an original Suzuki workshop manual I purchaced through ebay USA.

The TSCC was replaced with a 12XX big hp jobby and only has 42k km on it, I will stip it and do some internal work as we don't know its history but the clutch was shot when the 750 was picked up, so I don't have high hopes.

Deano, I was recomended an Autronic because of its self tuning ability but it was quite expensive. I understand that it will cut down on dyno time and help pay for itself. Can you give me any info on what it is like to use? Thanks.

[Deano]

The sm4 works better than any other ecu when running itb. You will be mapping in throttle/pressure mode so auto tune won't work. I could waffle on for hours about how great I thinks it is but I won't. Exben has used Autronic with great success along with mr.zxr so the proof is in the pudding. It is not expensive compared to what you get. It will do just about everything you can think of and then some.

There are areas in a bike build that you can save some $$$$ but I think the ecu is NOT one of these areas.

Buying a brand name, well supported and turbo bike proven ecu was the best money I ever spent

[latheboy]

I'd have a look at Haltech for ECU's, autotunes and heaps of other things built in.

They aren't very big in OZ even tho they are based in shitney, but they are massive in the US and Eurotrash.

[Issues]

Abit of a grave dig but I have been working away and the XN has been stored in a mates shed. I'm picking it up this weekend. I have just bought a K3 GSXR1000 for a parts doner. Here is the question. Could I use the complete GSXR1k wiring harness on my GSX750TSCC with a power commander or someting? The original wiring harness is pretty much cut up and rooted, apparently the XN85 engine was running but its been sitting about 8 years.

Plans are to fit all the GSXR susspension and wiring harness with gauge cluster and FI, looking at either GT2860 or custom TD05. I'm not sure if I will intercool it or not, maybe go with minimal look being a cafe bike.

[Dynomutt]

TO use the GSXR injection system would require mounting all the various sensors etc onto your motor. You may be able to graft the XN85 set up onto your 750 motor and then a power commander onto it. If you have a look on 750turbo.com the guys over there have had very good results grafting power commanders onto the GPZ750 turbo ECU, a couple of the guys have even grafted the latest power commander 5 and used the autotune facility.

[ALBI]

motronic or microtec is the goods,a lot of drag racers use motronic i have a shop around the corner from home that is motronic!
ive seen some autronic unit in some cars and the owners swore of them ??

dont know if they were comp savey or not!!

wolf 3d was the go in the 90's but havent heard much from them

just work out wat you want the system to do for you and go shopping,ask the manufactor,surf online and see what is being said about the product!!

[BANDITROD]

i took deanos advice and got a autronic sm4 for my bike i am yet to test it but after all the hype im sure it will be the goods

[Deano]

The results speak for themselves. I know of 3 Autronic ecu's fitted to turbo bikes on this forum and 2 of those were replacing other ecu's because the first ecu weren't giving the required result.

If you were to talk to some people running the ecu you were thinking of and there experience with it the that would be a good start.
Ignore any comment about what has worked great on cars unless they are talking about something with itb and turbo.
Last I heard wolf closed down a couple of months back. A mate had a new wolf ecu on his mini with a turbo corolla motor in it and they had all sorts of proplems getting the thing to run. All to do with the sensors for crank apparently. Once running it was ok apart from not wanting to rev past 6500. He ended up wishing he had put a motec or Autronic on it.

[BANDITROD]

i know a few mates that had shitloads of trouble with wolf 3d on there turbo cars ended up going with motec

[Tony Nitrous]

I'd love an XN85 just for the novelty value,
but as a useable bike they weren't that good
(or piss-poor if you put one up againsts the Kwak)

Good way of owning a registered / legit Turbo bike though,
Its been mentioned before but not seen it done.

Interesting.