7AFTE, Tuning Question Options

[celicomx]

I'm currently building a 7AFTE, my question is, go FMU? or SAFC witch 350cc Injectors? I'm going to boost less than 10psi, so any advice is welcome.

[Micky_lovescelic...]

I'm currently building a 7AFTE, my question is, go FMU? or SAFC witch 350cc Injectors? I'm going to boost less than 10psi, so any advice is welcome.

315cc injectors ( assuming ) that they are balenced and in good order. Are good for about 252hp. I like to side on caution and say that with age of
most fuel systems, pumps, thus you probably can support only about 214hp. You don't want to be operating at maximum injector cycle duties and
should have a buffer zone.

350cc is good for about 280hp. However, I ponder if the injector drivers are capable of supporting such large injectors. I expect very poor control.

With that said you need to understand how other aspects work, the factory 7AFE injectors aren't big by any means, they are something like 180cc.

Beyond that, The Apex-i SAFC or NEO etc, such systems are really only good for fuel corrections, not comparable to standalone management.

What these systems do is alter / modife the signal that is being sent to the ( factory engine-management. ) Where as something like a true piggy back like a e-manage or e-manage ultimate actually acts as a standalone.

It keeps the factory original ECU in a closed loop state, basically the ECU thinks everything is operating as normal. And the E-management and corrisponding sensors and so on are communicating. However, you still have to work within the factory limitations of the factory architecture.

I don't know how extensive you have built your 7AFE or 7AFTE as you call it. But, 10 psi is a tad ambitious with a Apex SAFC II. Sounds like you are using the old ( dump a lot of fuel and pray method. = ) You are better off with a smaller high response turbo and well balenced induction system using maybe 4.5~6psi tops. A well sorted low pressure, high response
system is superior to lots of lag and huge amounts of power.

One of the aspects of my job is that I not only design the hardware but the software as well for engine-management systems and ancilary devices.
Beyond this and amongest other terribly borning stuff, I have pretty much used every major competitive engine-management system on the market.

Good luck,
Mick

PS, It all depends on how extensive you want to get and how well refined.
Remember the fuel is only one aspect, induction systems are a multitude of parameters and beyond that
we haven't discussed the ignition system. ^_^