suzuki efi + turbo

[derangedrover]

Wondering if anyone can enlighten me what folks are doing in terms of engine management when turbo'ing gsxr's/busas etc?
Does Suzuki use a map sensor that can read positive pressure, or is this something that needs to be addressed?
A brief bit of research revealed people using PCIII's and not much more, surely there must be more to it than that in terms of management (not talking pumps/injectors/timing etc)?

Cheers
Daryl

[Booster]

Several ways to do it.
powercommander only works well if using a FMU with a hi rate of rise in the fuel pressure, basicly the fmu does most of the fueling with the PC filling in the gaps, problem is it can only be tuned for a limited window of boost.
option 2 is a secondary injector system that keeps the oem injectors and ecu operating as usual and has a piggyback ecu that reads boost and drives a second set of injectors to make up the extra fuel needed.
option 3 is an interceptor that can read boost ,picks up the oem injector signal and modifies it and drives 1 set of injectors (usually bigger than std) in the oem position.
option 4 is a complete standalone ecu programmed from the beginning .
i like option 2 as (in my case) Suzuki did pretty good with the std tunes, even with a turbo a yosh box tune can bring it back into line ,
Tuning for top end isn't difficult the hard part is making a usable part throttle , driving out of corners with out snatching , good economy ,easy starting and idle .

[Docktor]

WTF is a FMU. Fuel management unit i assume. In lamens terms is that a rising rate pressure reg?. Pete keeps asking me and as far as i know its a fuel pressure reg that adjusts fuelling for boost. i.e ^lbs of boost = 6lbs more fuel pressure .

[Booster]

http://www.bellengineering.net/Pages/products_FPR.html
I have done 3 busa's with the 2025 and a powercommander.
I posted on the GS thread another way to do it with what you have Doc , but it will probably take more time than you have before this weekend. I have a FMU here also but its $200 for a reco unit

From the Bell pages
Pressure calculation: the fuel pressure required increases with the square of the boost pressure ratio:
Example: 6 psi boost is a pressure ratio of 1.41. With stock fuel pressure of 36 at zero boost, than:

Needed fuel pressure = ( PR2 x 36) + boost = (1.412 x 36) + 6 = 77.5 psi

[derangedrover]

Thanks booster.
So if you wanted to run ~7psi on a stock motor (not decompressed), a PCIII, an FMU, slightly larger injectors if needed and a tune would get you out of trouble, or would you need a new fuel pump also to get to ~80psi and required flow rate?
Any recommendations on where to look for piggyback ecu's and larger injectors, pumps etc?
Where's the best place to do research, like where's the best place to position secondary injectors etc.
Excuse my ignorance but I'm guessing your in the 'bike industry'?

Cheers
Daryl

[Booster]

Was in the motor trade but the shine goes off playing with your toys when doing it daily on oil changes and brake pads, Farming now..
Std pump (busa) can't flow enough fuel for more than ~200hp
PC, FMU ,pump like the bosch 910 (needs to be good to have adequate flow rate at high pressure)will nearly do 300hp with std injectors.
Microtech MT2 or MT4 are commonly used in the US for secondary controllers, these have to be ordered to suit the application , i am about to try a haltec f9 as the microtech looses its wideband O2 sensor interaction when the 12000rpm option is activated and i want to be able to datalog mixtures,revs,boost, air temps etc.
most put the secondarys in the plenum aiming straight down the throttlebodies.

[evad]

Booster, have you had a look at the ms extra code? It has a fair few options? http://megasquirt.sourceforge.net/extra/ and you are able to log using a palm pda. http://www.msefi.com/viewtopic.php?t=17184 and it all downloads into log veiwer http://www.ideasandsolutions.biz/megalogviewer/MegaLogViewerVE_Analyze_Manual.pdf
I know that you have used the upmarket units, but was wondering if it might suit your needs?

[derangedrover]

Hey Booster,
Do you have any pics of how you hooked up the 2025 and external pump?
Where have you fitted the return line etc, and what did you do with the stock pump etc?

Much appreciated.
Daryl

[Booster]

http://www.streetfighters.com.au/forum/upload/253911844149167.jpg

can't see a whole lot,oem pump removed, bulkhead fitting in tank sump for hi flow outlet,to pump , to filter, to fuel rail to fmu ,to oem outlet for return. two throttlebody nipples connected to the fmu signal supply check valve fitted inline so it only sees pressure. fmu bleed screw set 3/4 to 1 turn out .
This works for the Bell, a Vortech would need a fuel pressure reg too as they only raise with boost not set base levels.

[derangedrover]

Thanks for that.

Cheers
Daryl