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| Returning Fiero Owner - Let's Talk 2.8 Breathing (Page 5/14) |
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sourmash
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APR 05, 02:08 PM
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SpaceLion
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APR 05, 02:26 PM
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Oh yeah, can't wait to get it. Did you get my last PM Sourmash? I just need to know how you'd like to receive your money.
| quote | Originally posted by sourmash:
Keep in mind the failure rate of the ebay Chinese turbos is extremely quick and high. Many fail within weeks due to tolerance issues.
Anyway, this turbo intake has been ported out to 64+ mm. Of course you don't have to use one with that large of an opening. Here are some more shots. There's more than $50 in work done to it. Looks pretty clean inside.
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SpaceLion
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APR 05, 02:32 PM
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Yeah that is a lot wider opening than I would probably use, I think I'm just going to go with the guy that Ray recommended and port a stock TB to 56mm and just make a gasket so that's a little more plug and play. I do wonder though if it will fit... [This message has been edited by SpaceLion (edited 04-05-2020).]
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sourmash
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APR 05, 03:17 PM
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I replied to the one PM a few days ago, but that was the only one. For me I'd save the money and use a larger TB and replace the electrical plug and any hose fittings. Especially for a potential turbo later. The stock intake is about 51.9mm with this caliper. You'd have to drill and tap for the Fiero TB and it's pretty close to the opening of the intake throat to fit a stock TB. It's probably doable but it's not so difficult to change the TB itself and save the 150 and spend half on reworking to a larger TB.
Along with the TB I'd do the exhaust manifold mods and cross-over mods that people talk about.
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BillS
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APR 05, 05:01 PM
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It looks like you have been doing the right sorts of things. The injectors may be just slightly large, but not so much that you will have issues with idle.
I've built two engines for these cars over the years. The first was a stroked 3.2 (.040" over using an 3.1 crank) with special low compression pistons and an IHI turbo boosting at 10 psi. Very reliable and very quick, and lasted well for almost 20 years. Custom Comp Cams stick designed specifically for turbo use and their roller high ratio rockers and springs, and forged custom Ross pistons to keep it all together. Lots of fun with Porsches that didn't have a turbo in there.
The second engine was a naturally aspirated engine based on a 3.4 engine, with a Crane 272 cam, a bunch of head work and a reworked Firebird/Camaro intake manifold which isn't perfect but gives you a starting point way ahead of the stock Fiero manifold. The removal of restrictions in the head, and manifolds (including the use of a 62 mm TB), and including exhaust opened things up very nicely and the engine no longer runs out of steam below 5,000 - t pulls cleanly to 6,000 at which point you might as well shift as power is dropping off.
If any of that is of interest, you can see pics and description at http://www.britishv8.org/MG/BillSpohn.htm
The engine is installed in a 2000 lb. fiberglass bodied MG and we estimate that it is around 200 bhp.
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SpaceLion
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APR 05, 05:39 PM
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Yes , luckily a previous owner had a true dual exhaust put on. I'll have to see what I'm working with when I take physical ownership on the car in June. We'll see. I replied to your reply also.
| quote | Originally posted by sourmash:
I replied to the one PM a few days ago, but that was the only one. For me I'd save the money and use a larger TB and replace the electrical plug and any hose fittings. Especially for a potential turbo later. The stock intake is about 51.9mm with this caliper. You'd have to drill and tap for the Fiero TB and it's pretty close to the opening of the intake throat to fit a stock TB. It's probably doable but it's not so difficult to change the TB itself and save the 150 and spend half on reworking to a larger TB.
Along with the TB I'd do the exhaust manifold mods and cross-over mods that people talk about. |
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SpaceLion
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APR 05, 05:45 PM
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Bill, You have a Fiberfab Jamaican?? I only just recently discovered these cars and I absolutely love the styling. Clearly inspired my the Miura/GT/E-Type. Rumor has it there were about 250 made. I actually found one on facebook marketplace last month in Ohio the guy was selling for 3500. I immediately offered him his asking price, saw that he read my message, followed up a couple of times, saw that he read those, no reply. A couple of weeks later, it was marked as sold. Definitely on my dream sheet. I've just been doing a lot of research on these lately so it's weird to see yours pop up in the thread about the car that I bought instead.. lol. Very cool. Let me know if you ever sell it.
| quote | Originally posted by BillS:
It looks like you have been doing the right sorts of things. The injectors may be just slightly large, but not so much that you will have issues with idle.
I've built two engines for these cars over the years. The first was a stroked 3.2 (.040" over using an 3.1 crank) with special low compression pistons and an IHI turbo boosting at 10 psi. Very reliable and very quick, and lasted well for almost 20 years. Custom Comp Cams stick designed specifically for turbo use and their roller high ratio rockers and springs, and forged custom Ross pistons to keep it all together. Lots of fun with Porsches that didn't have a turbo in there.
The second engine was a naturally aspirated engine based on a 3.4 engine, with a Crane 272 cam, a bunch of head work and a reworked Firebird/Camaro intake manifold which isn't perfect but gives you a starting point way ahead of the stock Fiero manifold. The removal of restrictions in the head, and manifolds (including the use of a 62 mm TB), and including exhaust opened things up very nicely and the engine no longer runs out of steam below 5,000 - t pulls cleanly to 6,000 at which point you might as well shift as power is dropping off.
If any of that is of interest, you can see pics and description at http://www.britishv8.org/MG/BillSpohn.htm
The engine is installed in a 2000 lb. fiberglass bodied MG and we estimate that it is around 200 bhp.
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[This message has been edited by SpaceLion (edited 04-05-2020).]
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La fiera
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APR 05, 09:37 PM
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| quote | Originally posted by BillS:
It looks like you have been doing the right sorts of things. The injectors may be just slightly large, but not so much that you will have issues with idle.
I've built two engines for these cars over the years. The first was a stroked 3.2 (.040" over using an 3.1 crank) with special low compression pistons and an IHI turbo boosting at 10 psi. Very reliable and very quick, and lasted well for almost 20 years. Custom Comp Cams stick designed specifically for turbo use and their roller high ratio rockers and springs, and forged custom Ross pistons to keep it all together. Lots of fun with Porsches that didn't have a turbo in there.
The second engine was a naturally aspirated engine based on a 3.4 engine, with a Crane 272 cam, a bunch of head work and a reworked Firebird/Camaro intake manifold which isn't perfect but gives you a starting point way ahead of the stock Fiero manifold. The removal of restrictions in the head, and manifolds (including the use of a 62 mm TB), and including exhaust opened things up very nicely and the engine no longer runs out of steam below 5,000 - t pulls cleanly to 6,000 at which point you might as well shift as power is dropping off.
If any of that is of interest, you can see pics and description at http://www.britishv8.org/MG/BillSpohn.htm
The engine is installed in a 2000 lb. fiberglass bodied MG and we estimate that it is around 200 bhp.
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That intake is a choker bill! Beautiful car tough![This message has been edited by La fiera (edited 04-05-2020).]
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Dennis LaGrua
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APR 05, 10:46 PM
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| quote | Originally posted by sourmash:
Keep in mind the failure rate of the ebay Chinese turbos is extremely quick and high. Many fail within weeks due to tolerance issues.
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Possibly so but porting will never get you anywhere near as much air into the engine than as a Turbo. If you are concerned about Chinese turbo quality then a good used Garrett, HKS, or Holset may be the ticket.
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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 "
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ericjon262
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APR 06, 03:17 AM
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| quote | Originally posted by sourmash:
Keep in mind the failure rate of the ebay Chinese turbos is extremely quick and high. Many fail within weeks due to tolerance issues.
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it's worth mentioning to, that there are plenty of people making big power on the Chinese turbos, and have been for a long time. it's also worth mentioning that in some instances, you can buy 2 or 3 of them for the price of say, a precision 6266.
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"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
cognita semper
http://www.fiero.nl/forum/Forum2/HTML/119122.html
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