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| 4 Cylinder Engine Swaps (Page 1/2) |
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BillS
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MAY 28, 08:53 PM
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I don't recall seeing any 4 cylinder swaps - has anyone done them?
The obvious candidate is the Ecotec - they were available in a couple of FWD configurations that should be adaptable to the Fiero. Dead easy to get c. 375 bhp from them or more if you are prepared to buy some pistons and they take up less space than a V8.
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Dennis LaGrua
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MAY 28, 09:12 PM
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Ecotec Swaps have been done in Fieros. I would say they were never real popular but we did have a few guys here a while back who did them. One member even made a swap kit but I can't recall his name. You can purchase ready made swap harnesses for the early engines but hard to find for the later engines. ------------------
" 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 "
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BruhMans06
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MAY 29, 10:41 AM
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So the Ecotec is one engine that a lot of people are into but.... if you are up for the work involved, I would recommend a K series. this is all dependent on whether or not you are up for spending extra money on axles for the Honda transmissions. The K series are fantastic engines and its almost fits too perfectly in the Fiero, but its definitely a challenging swap. Not many have done it but there are Facebook groups out there for K swapped Fieros with guys that are more then happy to help with any questions you have for it.
Ive been working on my K swap for almost a full year now, and im close to getting the car driving. I know a guy on Facebook that tracks his K Fiero and it blazes through the track. Other then these two engines, the Honda K series and the Ecotec, im not aware of any other swaps.
well, im bias soo..[This message has been edited by BruhMans06 (edited 05-29-2025).]
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FieroWannaBe
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MAY 29, 11:59 AM
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There have been a few Sunbird Turbo C20GET swaps.
Quad 4s have been swapped for a while, but good examples of those engines are hard to come by now.
Ecotec swap are around, but I think the Transmission changes required, and the ECU tuning limitations stop a lot of people.
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BillS
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MAY 29, 12:00 PM
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The K series is a great engine, though often expensive to build (as I expect you found out) but for c. 200 bhp they are pretty bulletproof.
The reason I'd prefer a turbo Ecotec is lower cost, already designed for fairly high output levels (stock options for the 2.0 of 260 bhp and you can get c. 375 bhp without going inside the engine (that's what I have in my Solstice).
The turbo LNF came in transverse front mount in the HHR SS and Cobalt SS - I wonder if the whole power unit/transaxle could be fitted to a Fiero?
I went after market turbo on my 88 Fiero GT - built a stroker 3.1 and ran it at 10 psi with no issues for twenty years -- limited the boost to 10 psi as it is such a swine of a job to fit an intercooler on a Fiero but it was fast and reliable.
The Ecotec is a strong and (fairly) modern engine - so far it has been putting out the 375 bhp at 25 psi max boost in my Solstice for 16 years......
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BillS
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MAY 29, 12:07 PM
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| quote | Originally posted by FieroWannaBe:
Ecotec swap are around, but I think the Transmission changes required, and the ECU tuning limitations stop a lot of people. |
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The trans changes could well be difficult - hs anyone tried to see if the whole lump can be fitted to a Fiero?
I'm not aware of any limitations on the tuning end - you just get an ECM from the car the LNF came from and have it tuned - there are people running well beyond 400 bhp on that engine and ECM - some of the Cobalt SS guys are crazy - here is one with 500 bhp on the street:
https://www.youtube.com/watch?v=pOQWcvfxxt8
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Raydar
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MAY 29, 01:42 PM
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I remember you! It's been a minute. Hope you are doing well.
I'm surprised more people haven't jumped into this thread.
There are several people here who have swapped Ecotecs into Fieros. I've even thought about it, but it requires a few cradle mods, and I don't weld, so...
But even a stock 2.4 is worth ~170 HP, right out of the box. And since that's the engine used in the Polaris Slingshot, there are quite a few aftermarket performance bits available.
Roger Thelin has been building swap brackets, cradle sections, etc., for a long time.
His web page is currently unreachable, but I would expect that he's still out there, doing stuff. His phone number is in the link, below.
https://www.fiero.nl/forum/Forum4/HTML/074936.html[This message has been edited by Raydar (edited 05-29-2025).]
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1985 Fiero GT
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MAY 29, 02:04 PM
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BillS
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MAY 29, 03:10 PM
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I know that there have been quite a few V8 swaps done and presumably the transaxle takes the torque. My LNF puts out 347 Tq at the wheel s- not sure how that translates into traditional power at the flywheel. Can the Fiero transaxle accommodate that? It is similar to the LS engines.
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FieroWannaBe
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MAY 29, 04:11 PM
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The Buick Regal came with e 2.0L Turbo and the F40 trans, I would assume, it could fully be swapped, haven't seen it though.
The supercharged Cobalt SS drivetrain has been down at least once, the axles for that application are bolt in on the Fiero with a F35/F40 transmission.
The practical life of the Fiero transmission is over. Parts are hard to find.
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