Turbo my 3.4 pushrod (Page 1/3)
M.aaron80 OCT 23, 11:47 AM
I have a 88 with 5spd trans and a pretty fresh 3.4 pushrod from a 96 camaro. It also has crane cam and heads done. I’m considering putting a turbo on since the hard part is all done. Can anyone help me out? I was planning my 2nd 3800 swap but I bought the car I with a nice 3.4 already in. Thanks
pmbrunelle OCT 23, 01:50 PM
What do you want to know?

BTW, there is a turbo kit for sale in The Mall:
https://www.fiero.nl/forum/Forum4/HTML/079543.html
M.aaron80 OCT 23, 03:09 PM
What type of turbo or kit I can put together. Thanks! I’ll ask if he has it
Dennis LaGrua OCT 23, 07:14 PM

quote
Originally posted by M.aaron80:

What type of turbo or kit I can put together. Thanks! I’ll ask if he has it


I used a Garrett T-3 turbo on my 3.4L setup. Its uses the Buick Grand National compressor wheel. With 10 lbs of boost it gives fairly quick performance very similar to my 3800SC as the turbo car has a modified TH125H with 3.33 FDR that does help the acceleration quite a bit. If you go turbo be sure to use premium fuel and add octane booster if you do a 1/4 mile run.


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" 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 "

[This message has been edited by Dennis LaGrua (edited 10-24-2021).]

pmbrunelle OCT 24, 12:56 AM
There were some turbo kits made for the Fiero, such as the Miller-Woods kit.

However, there are no Fiero turbo kits in production anymore, so if you want a pre-made kit, you have to find one used.

On my own 3.2 L Fiero, I decided to get the various parts piece by piece. The centerpiece is the T04E 50-trim turbo, with 0.63 AR turbine housing and T3 stage 3 turbine wheel. I suppose it works OK, but I don't have enough experience driving many different turbo cars to make a good judgement. I almost always run 91 AKI pump gas, street or strip.

I would suggest looking into the BorgWarner EFR line of turbos. Each one works with a pretty wide window of airflow, so it's easy to match an EFR turbo to an engine. Besides that, the wastegate and BOV are combined into the turbo, so you don't have to take care of buying these items separately and plumbing them in.

Making your own setup piece-by-piece will require some study, whereas bolting on a pre-made turbo kit is probably simpler.
Dennis LaGrua OCT 24, 11:15 AM
If you wish to add a turbo its not all that hard but it does require fabricating a crossover pipe w a mounting flange, connecting to the exhaust, running the oil feed/return lines, installing a 2 BAR MAP sensor and using a special program to work with it. The timing tables in the chip program need to be programmed to work with boost and N/A operation. I built and installed Turbo kits years back, then swaps came along and made them less desirable. I may still have the chip programs for turbo operation but I'd have to search my old computer files. If you get the system working properly 250+ HP is possible but size the turbo and crossover pipe properly and do not run more than 9 psi of boost without an intercooler. When complete and you slam that pedal down to the floor, the excitement is incredible.

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" 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 "

BillS OCT 25, 07:29 PM
A performance cam for a non-turbo engine is not ideal for a turbo engine - consider changing the cam out before you add a turbo. I had Comp Cams do a custom cam for me when I turboed my 3.2.

Unfortunately, depending on how much boost you want to use, your pistons may also be non-ideal. I had Ross Racing make me up a custom set of forged pistons that had 8.5 compression so I could boost to the 10-11 psi level.

I have never understood why people build a conventional no-turbo engine and then want to add a turbo. There is a fair bit of difference between the two sorts of build.
reinhart OCT 26, 05:23 AM

quote
Originally posted by BillS:

A performance cam for a non-turbo engine is not ideal for a turbo engine - consider changing the cam out before you add a turbo. I had Comp Cams do a custom cam for me when I turboed my 3.2.

Unfortunately, depending on how much boost you want to use, your pistons may also be non-ideal. I had Ross Racing make me up a custom set of forged pistons that had 8.5 compression so I could boost to the 10-11 psi level.

I have never understood why people build a conventional no-turbo engine and then want to add a turbo. There is a fair bit of difference between the two sorts of build.



Yes especially lower compression and forged components.
M.aaron80 OCT 26, 10:46 AM
I did not build the 3.4 I bought it that way.
pmbrunelle OCT 26, 12:46 PM
You only need to modify the engine for turbo if you're looking for more power. Otherwise, many people turbo factory NA engines without changing anything.

Honest Don for instance has a turbo on a stock 2.8, and he did a 8.7872 ET in the 1/8 mile.
That translates to roughly 13.99 in the 1/4.
https://www.fiero.nl/forum/...HTML/098801.html#p24