PFF - Pennock's Fiero Forum, PDA Edition

Performance 84-86 Iron Duke TBI Units! (Page 1/1)

82-T/A [At Work]

OCT 28, 06:15 PM

Hey guys, I know a lot of you have, in the past, wanted that Holley 3739 TBI unit from back in the day (which is basically unobtainium). Well... I recently picked up a 1984 Chevrolet Corvette, which has Cross-Fire Injection on a 350 V8. I remember from back in the day, that my 82 TransAm (which also had at one point CFI), had the same TBI units. I was looking for some performance options for the Cross Fire Injection (since I find that system to be so unique) and ran across this company called, X-Fire Performance.

https://www.xfireperformance.com/

They provide a boring service for the Cross-Fire Injection throttle bodies, which happen to be the exact same TBI unit that's on our 1984-1986 Pontiac Fiero. They offer the service for $900, but that's for TWO of them (since the 82-84 Corvettes have two of these throttle bodies in the Cross-Fire Injection system). I just mentioned this to the owner, and he said he'd be happy to offer the service for 4 cyl Fiero owners.

If you've been looking for one of those aftermarket Holley 3739 performance TBI units... you don't need to spend $1,000 anymore, because you can get one bored (larger) for less than half that. Feel free to reach out to them via their contact form.

jdv

OCT 28, 06:46 PM

Tod if you are going to be tuning the vette http://www.dynamicefi.com/ makes the boards that works with that computer.

Patrick

OCT 28, 11:57 PM

quote

Originally posted by 82-T/A [At Work]:

They provide a boring service...

Hey... give them a break, Todd. Not every type of service needs to be exciting!

82-T/A [At Work]

OCT 29, 06:27 AM

quote

Originally posted by jdv:

Todd if you are going to be tuning the vette http://www.dynamicefi.com/ makes the boards that works with that computer.

Unfortunately, the owner (Bob), passed away a couple of weeks ago... so even though the site is still up, you can't actually order anything anymore.

quote

Originally posted by Patrick:

Hey... give them a break, Todd. Not every type of service needs to be exciting!

Haha... it's the most excitement you can have as a result of a boring task!

jdv

OCT 29, 02:30 PM

I didn't know. Have not gone to thirdgen.org in ages. It is one of the more knowledgeable tuning sites. Bob helped many people out even if they didn't buy his own product.
Rip Bob

Dennis LaGrua

OCT 29, 09:21 PM

If the modified TBI unit accepts the Fiero injector it will make the tuning job much easier. Editor Programs are available that will allow changes to the fueling table in the ECM but it may not be needed. Run with it, monitor the O2 sensor with a scanner and see.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

82-T/A [At Work]

OCT 30, 06:02 AM

quote

Originally posted by Dennis LaGrua:

If the modified TBI unit accepts the Fiero injector it will make the tuning job much easier. Editor Programs are available that will allow changes to the fueling table in the ECM but it may not be needed. Run with it, monitor the O2 sensor with a scanner and see.

It does! You send them just the base plate (they don't do anything with the fuel metering part) and they send it back to you restored and bored out. You can send them the top part (if you want it refinished like the bottom part), but that's an extra charge. There are also aftermarket injectors that will fit this TBI unit in stock of the factory injector (if you prefer).

Dennis LaGrua

OCT 31, 08:33 PM

quote

Originally posted by 82-T/A [At Work]:
It does! You send them just the base plate (they don't do anything with the fuel metering part) and they send it back to you restored and bored out. You can send them the top part (if you want it refinished like the bottom part), but that's an extra charge. There are also aftermarket injectors that will fit this TBI unit in stock of the factory injector (if you prefer).

I was alluding to correct injector flow but it looks like you have that solved. THis TB conversion may be exactly what Duke Fiero owners are looking for especially if a turbo is added. With a cam, 5 psi of boost and some port work, a 135HP Duke is possible and would make life easier for some.