New question, old info (Page 1/2)
1of269 MAY 31, 05:35 PM
Hello everyone, this has probably come up a thousand times, but being a newbie here, and not knowing how to navigate through all this I just wanted to ask:
1. How much boost could a 2.8 crank handle? And how about the 2.8 rods?
2. Anyone here have a 2.8 Turbo build thread, if so, can you leave a link? THANK YOU!!
IMSA GT MAY 31, 05:54 PM
I don't have information about adding a turbo but I will say that the money spent vs. horsepower gains is not worth it. Lets put it this way, here is what one member did to his 2.8:
- KKK K26-6 turbo from a Porsche 944 Turbo
- Custom turbo crossover and downpipe
- Turbonetics Evolution wastegate, set at 7 psi for now,
- Frozenboost A2W intercooler and plumbing with heat exchanger mounted behind radiator fan
- 7730 ECM running DIS custom tuned $8F codemask by Darth Fiero
- Knock sensor & custom crank sensor/bracket/trigger for DIS
- 24lb, 4-hole Mustang injectors, 255lph fuel pump
- Custom exhaust, no cat or muffler, 2.5" to C6 'vette tips.
- Bored TB, "Dawg-style" modified upper plenum done myself, ported middle intake
- Innovate wideband AFR, Speedhut digital boost gauge
- Engine oil cooler post-turbo behind fenderwell side-scoop
- Motor is fully rebuilt, .060 over, 3-angle valve job, cleaned-up heads, ported manifolds, stock specs on all other internals
- EGR, CSI, cruise, and PCV can all deleted; TB coolant lines deleted from TB and rerouted to turbo

Stock 2.8 quarter mile time is 15.9 and his is now 14.83. Is the money spent worth that small of a gain? The stock 2.8 block was not designed for high performance.

Other than that, I considered doing a turbo setup just for the sound and looks, not for any major gains.

[This message has been edited by IMSA GT (edited 05-31-2022).]

pmbrunelle MAY 31, 07:02 PM

quote
Originally posted by IMSA GT:
I don't have information about adding a turbo but I will say that the money spent vs. horsepower gains is not worth it. Lets put it this way, here is what one member did to his 2.8:
- KKK K26-6 turbo from a Porsche 944 Turbo
- Custom turbo crossover and downpipe
- Turbonetics Evolution wastegate, set at 7 psi for now,
- Frozenboost A2W intercooler and plumbing with heat exchanger mounted behind radiator fan
- 7730 ECM running DIS custom tuned $8F codemask by Darth Fiero
- Knock sensor & custom crank sensor/bracket/trigger for DIS
- 24lb, 4-hole Mustang injectors, 255lph fuel pump
- Custom exhaust, no cat or muffler, 2.5" to C6 'vette tips.
- Bored TB, "Dawg-style" modified upper plenum done myself, ported middle intake
- Innovate wideband AFR, Speedhut digital boost gauge
- Engine oil cooler post-turbo behind fenderwell side-scoop
- Motor is fully rebuilt, .060 over, 3-angle valve job, cleaned-up heads, ported manifolds, stock specs on all other internals
- EGR, CSI, cruise, and PCV can all deleted; TB coolant lines deleted from TB and rerouted to turbo



The project thread for that car is here:
https://www.fiero.nl/forum/Forum1/HTML/089931.html

Then there's boretti's project:
https://www.fiero.nl/forum/...130314-2-103956.html

My own project which is a work-in-progress:
https://www.fiero.nl/forum/Forum2/HTML/142133.html

********************************************************************************

Download the Chevrolet Power Manual and have a look:
https://gafiero.akroncdnr.com/docs/60V6Pwr.pdf

Fiero 2.8 engines have "large-journal" crankshafts.

The challenge with turboing a stock V6 is more with how the top end breathes than the robustness of the bottom end, IMO.

********************************************************************************

Check the current quarter mile list for typical results:
https://www.fiero.nl/forum/Forum1/HTML/098801.html

[This message has been edited by pmbrunelle (edited 05-31-2022).]

IMSA GT MAY 31, 09:18 PM

quote
Originally posted by pmbrunelle:

...




See for me, I always take someones question and think "a turbo kit with pipes" I never think how far they are going to build the motor.

You have a very nice built engine so yes, I can see a turbo working awesome in your case.

[This message has been edited by IMSA GT (edited 05-31-2022).]

Frenchrafe JUN 01, 03:55 AM
There was the Fiero in Norway (I believe?) that got over 400HP from a 2.8L block.
However, he used SBC rods, custom pistons and a custom crank. And he still had clutch problems holding the torque!
Expensive build😜
There are alternative engines that are better suited to boost. It's just a question of time, skills and money as to which way to go...

Regards,
Rafe

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"Turbo Slug" - '87 Fiero GT. 3800 turbo. - The fastest Fiero in France!
https://youtu.be/c4Cu7_2OgYc
https://www.youtube.com/cha...1wZvWQlkYxTjivW_0XNg

Frenchrafe JUN 01, 03:57 AM
Double post.

[This message has been edited by Frenchrafe (edited 06-02-2022).]

1of269 JUN 01, 09:51 AM
pmburnelle THANK YOU!! Exactly what I needed.
IMSA GT JUN 01, 07:38 PM
What is your goal with the setup? Do you simply want a few extra horsepower or do you want to do a full build-up on the motor?
Dennis LaGrua JUN 08, 09:29 AM
My first foray into building a boosted engine was on a stock 2.8L with 6 lbs of boost using a Garrett T-3 turbo from an old 2.5L Ford Thunderbird. The timing and fueling tables in the ECM had to be altered to accommodate the boost and to keep from blowing the somewhat weak cast pistons. Performance was improved but I didn't feel comfortable driving with that setup. This led to me building a 3.4L with a larger turbo a complete rebuild with a cam, forged Ross Pistons, 24 lb injectors, MSD ignition, reprogammed ECM, and to hold the extra power I used a beefed up TH125H transmission. The car is fast but economy with the 3 speed is 20 hwy MPG. I probably have over $6,000 invested and performance is not as good as my 3800SC which gets 29 hwy MPG. If I look back I consider the 3.4L Turbo build a gross waste of money. The 3800SC was designed for boost, the 4 speed 4T65eHD gives better drivability and cost less than half of what the turbo 3.4L V6 build cost. Just my experience.

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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 "

XxdjxX89 JUN 08, 04:35 PM
The engine can handle 7lbs , maybe more ,,, I broke piston rings and blew head gaskets on the 2nd bank ,,,, was cool learning experience ,