I am currently saving for a twin turbo setup (DIY sorta thing)
I thought about a supercharger but just like the idea of turbos

I am wondering what you guys think would be the best FMU to go with.

Is there an FMU that works with the stock ECU to control the fuel and timing?

I have seen turbo setups with additional injectors but I would really rather just buy some bigger ones and use a piggyback fmu.

What about a good, cheap stand-alone system that can control it?

Just help me find a good midpoint between max safeness, max power, and min cost.

thanks

 

hows the Profec E-01?

I love gadgets and dont mind paying extra, but is it a good unit?

What all does it ome with?

Would I need any other electronics for my turbo setup?

 

Cheap and stand-alone don't really mix well.

If you really want to run an FMU, just get a takeoff from a Vortech or ATI kit. There's always some on EBay. I would also think about getting a 6BTM from MSD to retard timing under boost. I ran the ATI FMU and 6BTM on my old Procharger setup with no problems for 3 years.

As for a controller, I'll be using either an AVC-R or Profec-B on my twins. Haven't decided which one yet (probably the Profec). Jordon Musser was running an AVC on his single turbo car...I think there was a thread about it in the FI somewhere.

 

ATI fmu
I would get a cartech fmu. I ran one for about 2 years when my ATI went bad. It took the entire summer to get my ati back, so after the second week I ordered up the cartech.

 

so all i would need is the profec?

 

Dude this sounds like a pipe dream. Keep it stock. this way its safe and minumal cost

 

if you implying that i am in fact too poor to afford to do what i have talked about, then you are just wrong.

take my word for it.

 

I'm sure that this didn't imply that you were poor... an FMU is totally not needed. I won't have one on my car! It's one less thing you have to worry about failing, thats all he was trying to say.

"I'm RICH biatch"

 

If you want to do it the right way, buck up for the bigger injectors and an impedance converter. I'd never run an FMU on a car of mine.

 

sorry if I was a little snappy.
i just thought he assumed i was some kid just wasting your time.

kick ***.

I thought that some sort of FMU was mandatory to supply enough fuel?

So the stock ECU can handle the increased fuel demand?
I am looking for at least 500 flywheel hp.

If thats the case all I need as far as electronics go is a good timing retard right?

I just want to clarify because I never thought that all I would need is a timing retard.

GTG will elaborate after work...

thanks guys

 

What about the superfueler?

 

Superfueler is not optimal for a turbo. It can only add X amount of fuel based on a boost signal. It works well for a supercharger as the boost is linear, however if you mash the gas on a turbo car and hit full PSI around 3K rpms and it is rich as hell but leans out on the upper rpm's the fueler isn't going to compensate that well because there is only 1 setting for each psi of boost (depending what MAP you have). You still going to need to tweek the PCM to get the fuel right, so why not just get bigger injectors and tune it that way since you will need to do that anyways. Timing can also be taken care of in the PCM, no need for boost retard.

 

SMOKNZ, Say what???

Boost from a turbo is nonlinear, so tuning a PCM that is not boost-aware to know when to add boost fuel and take out boost timing is not gonna be easy. Most people use an aftermarket system as opposed to the stock PCM.

What you say about the superfueller is totally inaccurate. It has 10 settings based on amount of boost. However, it does not use those settings to just spew fuel. It also has a tach input that determines the pulsewidths to send to the injectors, adding the right amount at the right RPM range. The superfueller is a much better alternative to an FMU for any boost application.

 

Well I guess I'm not most people, I still use the stock PCM. At wot boost is pretty non-linear. The way I tune the car is to set the PE tables at worst case, ie. max load. I adjust timing in the 100kpa table for max boost at all rpm's as well. That way anything less will be covered. Optimal no, but it works ith a PCM that cannot see boost. I don't play around with the car at varying boost levels. It's either cruizing around out of boost or WOT. I may see some boost while accelerating slightly, but usually the MAF is not even close to being maxed out at that point and will compensate for the additional airflow should there be any.

Back to the superfueller. Have you ever used one? I have. The superfueller has little ***** to adjust the fuel, but it adds it at its own rate based on it's own MAP, RPM, and the **** setting. With a supercharger varying boost levels usually correspond to different RPM's so adjustment of the superfueller can be used to richen up or lean out the car at different RPM's by adjusting the *****. If the Turbo car's fuel dilivery curve set up in the superfueller is not right at WOT, there is nothing you can really do except make it rich at the leanest spot, making the rest of the fuel curve off. For example with my car I was running WAY rich in the Mid RPM range and running lean on top with the Fueller OFF. Should I have turned it on, I could have richened the top end with the fueller, but how was I going to lean out the mid RPM range with it without sacrificing the top end fuel. Boost was the same thru the whole RPM range so I was limited to adjusting 1 ****.

See what I mean? What is so innacurate about that I ditched the superfueler and got bigger injectors and Tunercat. Adjustment has been easy since

Bill

 

The superfueler has 10 settings... Since you always have "full boost" at WOT at lower rpms you could set the superfueler to see from 7-12psi and you can adjust fueling according to .5 psi. and boost should raise a tad more reaching higher rpms with a turbo too.. right? (not sure, never had a turbo car)

The pcm still has to compensate for RPM fueling... the superfueler will compensate for boost fueling... It works and it is reliable.

I had one... and it worked... it really worked, but the car consummed a lot of gas with it... it made the system inefficient. Maybe it did cool the intake charge and I was able to avoid detonation that way and gain a lot of power, because the car did good power for what it had.

I still have it. and I moved to 75# Injectors instead. I removed it from the car, but we will see how power develops and if i need it again...