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| Which transmission is best (Page 6/6) |
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IMSA GT
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APR 23, 09:08 PM
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| quote | Originally posted by lateFormula:
The F23 is rated for input torque of 170 ft/lb.
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| quote | Originally posted by Justinbart:
F23 all the way.
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| quote | Originally posted by Backroadgee:
The F23 is rated for input torque of 170 ft/lb.
F23 all the way. |
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Man you're really setting yourself up for one big ban hammer. Keep going.
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Dennis LaGrua
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APR 24, 06:22 AM
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| quote | Originally posted by Frenchrafe:
In the old post by Dark horizon he says that his Getrag was holding up to 500 HP. But he had modified his driving technique so as not to blow the gearbox.
Today, many years later, I am running a Getrag behind 407HP 3800 turbo engine. And have been for the last 10 years or so.
It's the clutch that takes the pain with my driving technique.
(And I suspect Dark horizon's as well?)
You can run manual gearboxes behind a 3800 as long as you are not a high revs/bouncing off the limiter and drop the clutch type of driver!
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Years back when I was drag racing and driving a stick we would "wind up" the transmission to prevent breakage. This technique involved going to the starting line in first gear and braking to keep tension in the transmission before moving on the launch. We feathered the clutch to take away any possible rollback where there might be backlash and shock on the transmission gears.. I can't say if this idea would work on a Fiero. It may have some merit but 500HP sounds pretty optimistic for a Getrag to handle..------------------
" 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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Frenchrafe
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APR 24, 06:46 AM
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| quote | Originally posted by Dennis LaGrua:
Years back when I was drag racing and driving a stick we would "wind up" the transmission to prevent breakage. This technique involved going to the starting line in first gear and braking to keep tension in the transmission before moving on the launch. We feathered the clutch to take away any possible rollback where there might be backlash and shock on the transmission gears.. I can't say if this idea would work on a Fiero. It may have some merit but 500HP sounds pretty optimistic for a Getrag to handle..
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I fact this is exactly what I do for launching, and in general for hard gear changes. It's my clutch disc that suffers, not the gearbox.
My Getrag's still going strong...------------------
"Turbo Slug" - '87 Fiero GT. 3800 turbo. - The fastest Fiero in France! @turboslugfiero
https://youtu.be/hUzOAeyWLfM
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CFiberFiero
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MAY 09, 02:51 PM
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dumb question, is the getrag 5 out of anything alright? im looking at what's listed as a "getrag 5 260 e30". Still learning as I jump into the deep end!
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Raydar
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MAY 09, 04:02 PM
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| quote | Originally posted by CFiberFiero:
dumb question, is the getrag 5 out of anything alright? im looking at what's listed as a "getrag 5 260 e30". Still learning as I jump into the deep end! |
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There are a lot of different Getrags, in other brands and configurations, as well as the ones we're interested in. Be careful.
If you want a Getrag, look for a 282. 86-90 or 91. Must be for a GM application. Find one for a V6. 2.8 or 3.1. The later ones have better differential gears, and different slave cylinder setups, but all have been adapted to Fieros. (One from a Quad 4 or Ecotec will not bolt up.)
Also consider a New Venture Gear T-550. It's essentially a 282, with a hydraulic release bearing, also with the better differential gears. Find one from a 3.1 Cavalier or similar. I think they made those 92 and 93. Maybe 94.
The F23 is also a Getrag. It's widely considered the sturdiest 5 speed that you can find for our application. The only real issue is that the one from the 2.2 OHV Cavalier (which is the one that will bolt to our blocks) has shorter gearing (3.91?) than most would prefer. Some people have built hybrids, and are quite happy.
The F23 can use stock Fiero manual axle assemblies. The F40 requires custom axles.
You also might stumble across a 284. They came in the 3.4 DOHC W-body cars. They are supposed to be a bit stronger than a 282, but are not rebuildable - no parts - and are pretty much absurdly expensive. They also have a strange (relatively speaking) clutch.[This message has been edited by Raydar (edited 05-09-2025).]
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Patrick
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MAY 09, 07:33 PM
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| quote | Originally posted by IMSA GT Here:
Man you're really setting yourself up for one big ban hammer. Keep going.
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Makes me wonder what the hell he/it was trying to accomplish. 
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CFiberFiero
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MAY 22, 11:11 AM
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| quote | Originally posted by Raydar:
There are a lot of different Getrags, in other brands and configurations, as well as the ones we're interested in. Be careful.
If you want a Getrag, look for a 282. 86-90 or 91. Must be for a GM application. Find one for a V6. 2.8 or 3.1. The later ones have better differential gears, and different slave cylinder setups, but all have been adapted to Fieros. (One from a Quad 4 or Ecotec will not bolt up.)
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What would the 282 come out of?
-edit nvm sorry for the dumb question. wikipedia has all the answers.[This message has been edited by CFiberFiero (edited 05-26-2025).]
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