I was gonna post this in the Power Adder section but it's really more appropriate to post it here, I think, since I already know how to put all the hardware together, I jsut need to figure out the electronic side of the project. I'm trying to figure this out for my brother's 86 Fiero autocross car with 3.4L Quad Cam motor out of a Lumina Z-34. Physically installing a turbo system (single T3/T4 hybrid, most likely) is not a problem. Getting fuel enrichment worked out so the pistons don't melt down, not so easy. I was thinking along the lines of a 2-bar MAP sensor, bigger injectors and then let somoeone else reprogram the stock ECM/chip for me. Then my brother suggested looking into buying a "piggyback" computer or something like that, installing a couple of extra fuel injectors into the intake, and only kicking them in when the motor goes into positive boost. We will be increasing the engine's output from about 220 HP now to roughly 300. I'm looking for suggestions (not necessarily limited to the above 2 ideas) from people who have actually done stuff similar to this before. I'm trying to get this project done in a quality way, but quickly, cost effectively and I don't give a rat's *** about the bits-and-bytes of it. I just want the results. Suggestions very much appreciated.

A lot of companies have produced add on injector kits with seperate controllers for them.
A lot of turbo Buick guys are using them with one injector.
I think A.T.R. http://www.atrperformance.com and Casper's http://www.casperselectronics.com/ make or sell them.


Here is an alternative way to inject extra fuel from a GN guy, http://www.gnttype.org/techarea/fuelsystem/7th.html

You can also get them with more injectors. Paxton http://www.paxtonauto.com was, and might still be making one for TPI/LT1 type throtle bodies that used three injectors.

Carroll Supercharging http://www.carrollsupercharging.com/ makes some they call "Superfuelers" that are worth checking out.

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

EFI Performance Club on Yahoo


[This message has been edited by IROCKZ4me (edited December 05, 2001).]

Thanks for the info. I will check them out.

Oops, I forgot about EFI Systems. Thats pretty bad since I have one of their PMS piggyback ECMs that they used to make for GM EFI setups. They don't make the PMS for GM apps any more, but they do make a "secondary injector driver" for add on injectors like the systems I posted above. Info is on this page: http://efisystems.com/sid.htm