OK, having never owned, nor known anyone who has owned a CFI set up, I know nothing about them.

I notice that they receive a lot of negative talk here on teh board.

Can anyone fill me in on what they were intended to do, and why all the negitive talk?

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'86 Camaro SC 2.8 V6, 5spd, T-Tops
Mods:

(Performance)
Flowmaster cat back exhaust

(Non-Performance)
Pioneer DEH-P4000 head unit
Pioneer 6X9 Tri-Ax speakers
Jensen 8" dual voice coil sub
Blacked out tail lights and side markers (VHT
Nightshades spray tint)

3

 

BBT,

The CFI system was the predecessor to the TPI system. The system used two TBI400 units (single bore and injector) and mounted the units opposite the cylinder banks that they served (thus the name, "Cross Fire"). The idea was to make longer intake runners that would promote better low RPM torque. This had been done in the '50s on larger engines with some success, and was the basis for the popularity of the old Offenhauser intakes.

The idea was sound, but the execution left a lot to be deired. Parts were unique, ports were too small (as is typical in OEM systems) and the result was not as promising as had been hoped. The TPI system hit the drafting table almost immediately and was released just two years later in an effort to recover from the poor acceptance of the CFI. The much longer intake runners of the TPI finally accomplished what the GM Powertrain boys were trying to do in the first place.

In addition, those opening the hood of a TPI for the first time got to see that long shiney plenum and all those silver intake tubes routed all over, and the image just screamed "sexy" and "powerful", like the old multiple velocity stack injection units of the past. Some uneducated people would say "Wow! A supercharger!" Well, not exactly, but the idea was in the back of their minds that TPI=performance. GM loved it all the way to the bank.

The CFI had no such immediate appeal, since it basically looked like a wide intake that didn't fit correctly under the air cleaner. Since it was only offered for a short time and on a few engines, it never got wide exposure. GM was fairly happy about that. On the down side, the systems that are out there don't have a lot of support and are misunderstood. A CFI can be made to run well, but the general opinion is that the engines aren't worth fighting. Much of that is not the fault of the induction system, but the inability of the ECM to manage the system and the poor choices of camshafts and compression ratios for the original engine.

Any other questions?

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

well. i got CFI and i get alot of crap from people.

go here for info
http://www.enteract.com/~mikew/cgi-bin/Ultimate.cgi
theres some people there running mid 13s with CFI

i got stock manifold and TBs and im runnin to sixty in about 6 secs with my mods in my sig.

i have an extra manifold i plan on porting soon so i can run with TPI, then i can see the look on their faces HAHAHAHA thats going to be fun


i raced an LS1 the other day and i kept up with him till 30 mph but by 50 he was 4 cars in front of me. but it was fun

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RED82TA5.7L

1982 Pontiac Trans Am
Cross-Fire Injected 5.7l V8
New TH350 Raptor with a shift-kit, 2600 stall torque converter, Eldebrock TES Headers, 3" Hooker Cat-Back.
Mods: 1.6 Proform Roller Rockers, electric fan, Corvette 5.7L computer chip, K&Ns, MSD 6A Ignition Box, MSD Conductor Spark Plug Wires .
Audio: JVC Kameleon CD deck, Jenson 4x6 front, Eclipes 6x9 rear, 2 10" mTx T4000 powered by a mTx 200watt amp.
Black Powder Coated 1990 16x8 Formula Wheels with 245/50/ZR16 Perelli P7000, 1.5" Jamex Lowering springs(pics are before lowering springs, ill get new ones soon).
For Pictures go to
http://members.theglobe.com/RED82TA57L/mycar/


A cool Trans Am site with Message Boards http://www.transamgta.com