S-AFC Fuel Management, 7afe options Options

[[Freemantle]]

I've recently acqiured a '95 ST as my new daily driver after some unfortunate mishaps with my previous vehicle (Honda Prelude). I've been a Honda kid since before I could drive, but I refuse to just give up on this car because it is "a 110 hp Toyota".

That being said, the Celica feels like it has no aftermarket when compared to anything I've driven prior. As a non-typical Honda guy, I'm all about keeping the car stock looking and using some shade-tree mechanic work to turn out some surprising numbers. I've got a T25 off a fresh rebuild and I'm ready to make this car a little more ballsy. I've done plenty of reading, I just have one issue.

The 7afe seems to have nothing as far as fuel management is concerned. I refuse to use an FMU (Boost dependent rising rate fuel pressure regulator) as "fuel management". It appears that the best kind of fuel management I am going to get is using the AFC hack, where I will use oversize injectors and dial them down with negative values with an AFC. Here are my questions.

A) How does the 7afe ECU respond to boost? The AFC will do nothing to correct ignition, it will just keep the car from seeing boost to dial down the map position (decreasing pulse duration to dial down the oversize injectors from choking the car).

B) Has anyone done this before?

C) What injectors fit the 7afe that can be easily obtained? What is the cc/min rate of stock 7afe injectors?

Thanks for your time.

[playr158]

another great deal for the money is the prs4 standalone unit.....which could potential be cheaper or more expensive then the greddy-emanage......note to run the e-manage you must by this and that attachment ect.....this and that sensor... the prs4 retails for 849$ and it will also adress your map sensor question because you can tac a 2.5bar map sensor for an additional 90$....... but standalone isn't for everyone especially if your under 10psi...its just a option....

[[Freemantle]]

Thanks for all the input, this has definately showed some aftermarket potential. This setup isn't going to be serious, (not much more than 8Psi on a junkyard turbo, hell - I paid $1800 for the car) so I doubt that a full stand-alone will be my avenue.

I can most likely get a secondhand e-manage unit for a decent price. If not I will most likely run the S-AFC and use my old PLX wideband from my old car's turbo setup and dial in the fuel for saftey reasons.

While timing control would be a huge power benefit as well as saftey, I'm not really looking to take home any tropies with this car, just give it a little pep and make it move like somthing besides "a girls car" (does every Celica owner get dissed with this?).

As far as the Dr's comments, you are correct in the sense that the injector duty cycle is greatly increasing, but the pulse duration per rotation is not increasing in a sense that will accommodate the increased density of each intake stroke. If you have it and you love it, then more power to you. I'm not saying that it will surely blow up your car, or that it should never be done, but past experience tells us that anyone on boost has a tendency to get bored and push the FMU system well beyond its limits. I'd be lying if I said that I didn't want this 7afe to put down 225whp, even if I fully know that isn't feasable with improvised fuel management.

Speaking of horsepower, what kind of engine (or wheel) horsepower do 7afte owners experience at low boost on stock internals? I'm not sure how responsive this car is to boost, and I want to size my injectors properly. I saw the post with the 240cc injectors listed, they just seem.... small compared to what I am used to using. Any larger alternatives? MKIII supra injectors perhaps? Thanks for bearing with me, I'm trying to dig up the Toyota ghetto-fab secrets.

EDIT: I'm having a tough time sourcing a manifold. Any suggestions? Do all "a" heads have the same port size?

This post has been edited by [Freemantle]: Jul 27, 2005 - 4:06 PM