Fuel Injection For Forced Induction?

What is the best fuel injection set up for forced induction,
regardless of price? Please feel free to go into details.



F.A.S.T., DFI gen 7, LT1 Edit, TunerCat?

THANKS!!:D

Probably a DFI gen 7. Not sure about the big stuff that was released a bit ago. You will find more info on turbobuick.com about this subject then on here

The stock PCM can be used with surprisingly good results. I am still using it, for example. But if you want an aftermakret system, the best unit in the "affordable" price range is the Electromotive TEC3. If $$$ is not an issue, the Motec.

Which is "best" depends on your budget and goals for the car. The main limitations of the stock PCM are as follows.

1. Cannot (readily) monitor MAP over 100kPa. IOW, it does not sense boost. There may be a work around if you want to make a career out of the project!

2. Will not operate over 7,000rpm.

3. Operates only high impedance injectors, which limits injector size. The Acceleronics add-on box solves this limitation neatly.

So, what do you have in mind? The aftermaket units have a variety of other useful/desirable features. Datalogging, ability to control multi-stge nitrous, use of multiple coils, etc. The BIG disadvantge with them is tuning for drivability. Anyone who tells you this is easy either doesn't know what they're talking about or is just lucky. It takes both knowledge and time to correctly calibrate EFI. The WOT part is easy, it's everything else that can be a real bitch.

Rich Krause

rskrause -

Let me piggyback on here a bit, and I guess add to the question.


I have run both Holley's and Carter AFB's. (original & edelbrock)

The Carter is a superior carb in a lot of ways, but it's almost TOO adjustable, and it's easy to get one really screwed up because of the immense adjustability. Holleys, on the other hand, are quite easy to live with because they have less adjustability and as a practical matter, are SIMPLER.

Carrying that analogy over to the fuel injection question, which system would be the Carter AFB of the fuel injection world, and which would be the Holley 750 Vacuum?


I ask this because I like a sort of "set & forget" kind of car, and I don't need or desire to adjust to the Nth degree. I just want something that will be reasonably simple to set up and run reliably.

If price is not an issue than Motec is probably the best aftermarket computer out there.

What are your hp goals?

Originally posted by IDOXLR8
If price is not an issue than Motec is probably the best aftermarket computer out there.

What are your hp goals?

Why is motec the best computer out there?

Originally posted by sleeperz28
Why is motec the best computer out there?

IMO the Motec is capable of doing more things than the DFI and FAST system. Thus has the most potential. :)

The only reason I mentioned Motec is because he stated that money was not an issue. Personally, I have a FAST system and can say I am extremely happy with it. :)

Stock PCM goes a long way. And the price is right... :)

Why not start there and upgrade when you outgrow it? I went stock because I didn't want to have to splice and dice the wiring if I didn't have to. So far, I haven't.

Now if you want to go 8s with a speed density setup, you've got your work cut out... :D

Originally posted by LameRandomName
rskrause -

Let me piggyback on here a bit, and I guess add to the question.


I have run both Holley's and Carter AFB's. (original & edelbrock)

The Carter is a superior carb in a lot of ways, but it's almost TOO adjustable, and it's easy to get one really screwed up because of the immense adjustability. Holleys, on the other hand, are quite easy to live with because they have less adjustability and as a practical matter, are SIMPLER.

Carrying that analogy over to the fuel injection question, which system would be the Carter AFB of the fuel injection world, and which would be the Holley 750 Vacuum?


I ask this because I like a sort of "set & forget" kind of car, and I don't need or desire to adjust to the Nth degree. I just want something that will be reasonably simple to set up and run reliably.

Good question! The best answer I can give is that it is possible to get completely screwed up with ANY of the aftermarket systems. Part of the problem is that they don't come with very useful guides. That's one reason I like the Electromotive - it does come with some decent tuning info.

In other words, it's very easy to make changes with any of them. The problem is figuring out what changes to make to achieve your desired result. The promotional materials are very misleading. Don't confuse "ease of use" with "easily tuned". A substantial part of the business at the shop I'm associated with consists of straightnening out the tune on cars where the owner has installed an aftermarket FI. Many of these things run so poorly, if they run at all, that they come in on trailers.

Bottom line: don't think it a plug-n-play situation. Unless you are very lucky or very skilled it's not going to be easy getting the drivability tuned into an aftermarket system. And I have NEVER seen an aftermrket car that runs as nice as a factory calibration. Makes sense, as I understand the OEM's have drivability experts that spend hundreds of hours doing the tuning. They also have equipment that we don't.

Not trying to dissuade anyone from an aftermarket FI, just trying to say don't do it if you don't need it.

And I agree - Motec is the best because it's the most flexible. Also very expensive. And it's no easier than the others, just more "powerful".

Rich