ivegot a fully built 2.4 with a t3/t4 , i have a safc2 and i know you guys say they are crap but it helps me out at idle, 35lb injectors walbro 255 pump and possibly a begi 2025 fmu , i have a 96 ecu so hptuners is out of the question, do you guys think that the fmu will get me to 13psi or what other route do i need to take
thanks guys you have always been alot of help
matt
I would look into upgrading to a '97 ecu so you can use hptuners. It will get your better results than trying to make your car run with the mechanical fmu.
you guys dont think that i can get their with the fmu, funds are limited at the moment becuase i had the motor built up right, maybe i could run 42lb injectors would that be safer, i dont have the money to get a 97 ecu wiring harness and all that , plus i am using a 99 motor which we tapped the hole for the knock sensor to make it larger to fit the 96 knock sensor that the car had.
i just want to know if it is possible to get their with the adjustable fmu , i have heard good things about the 2025 with our cars
bump anyone else help me out
Yeah you can deffinatly get there with proper sized injectors, the safc2 and an FMU, i know because ive done it, the only problem you will run into is with the SAFC. Its a great device (despite what everyone on here will tell you) But you come to a point where it cant really be used for idle and boost. To expound, the SAFC works well with an FMU, because the FMU will back pressure into the rail and you can fine tune this under high throttle position and RPM with the SAFC. However, with a low throttle and low RPM map in it you'll find that you need your injectors tuned way down. So you basically have a map that will need to go from the -40's range to possible the +20's or 30's, and thats obviously a very intricate range for your car to hit in meer seconds, going from pretty lean to very rich, so it doesnt end up hitting it well. The FMU will help but it compounds the problems by forcing you to tune around the RPM/throttle point where the boost kicks in and the FMU backs mad fuel into the rail. However it prevents you from leaning out from the boost so its more help then harm. To compensate for these problems you might want to look into an alternative method of tuning the injectors for idle and low throttle positions. HP tuners would help with this because you can just add the injector constant into the CPU and let the CPU take care of the idling.
I would personally look to upgrade to a 97 ECU, hptuners will save you much time and headaches. The driveability with the car will also be bear stock compared to an SAFC where you will continually be getting MAP codes and having open loop issues. Also on 13psi those injectors will not be enough, get yourself some 440's or even larger. Duty cycle at 10psi and those injectors is over 90% and that was on a supercharged car.
"Horsepower is the Ultimate Accessory"
ok so bigger injectors than what i have now , and you say that i might be able to get away with using the safc which is good news because my budget is tight. can you adjust timing withthe safc
SAFC is a fuel computer only. What most guys did prior to HPTuners was run a MSD ignition in order to retard some timing. There are some simple things you can do to help in tuning like a couple steps colder plugs and an adjustable fuel pressure regulator. One this you will certainly want to look into is a wideband. Widebands are expensive but it's one of those must have tools if you are planning to tune for boost numbers that you are looking for. It's sad to say but once you start doing what you wanna do the game isn't cheap and budgets are really going to restrict you from not only getting the car where you want it, but also having a well tuned, safe, and drivable vehicle.
"Horsepower is the Ultimate Accessory"
im already running a plx m300 wideband and NGK tr6 sparkplugs
