Adapting a Small Bore Slave for use on the Getrag. Pics and Info included. (Page 4/6)
Rodney FEB 10, 06:09 PM
The aluminum slaves I am making for the Getrag will be the same bore size as the OEM GM Getrag slaves. 23.86 mm. They can make them a smaller ID but not as small as the Isuzu slaves. 22.1 mm. The Isuzu slave is about 20.85-20.90. I am hesitant to make them smaller. GM made them this diameter. I have an OEM GM Getrag slave in my 88 and it works great. My pedal is near perfect in my opinion. I wonder what my tooling fee might be if I made a smaller slave for the Getrags in the 22.1 mm bore diameter and offered it as an optional slave for the Getrags.


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Rodney Dickman

Fiero Parts And Acc's Web Page:
www.rodneydickman.com
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7604 Treeview Drive
Caledonia, WI 53108
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JazzMan FEB 11, 01:24 PM
Can you hard-anodize the inner bore surface on these aluminum slaves? That'll reduce wear from dirt and grit that will get trapped against the piston seal due to the bore surface being exposed to air all the time except when the clutch pedal is pressed.

My dream cylinder would have a stainless cylinder liner.

JazzMan
Capt Fiero APR 12, 09:12 PM
Just another update I did this mod several months ago, FieroChick and I just got back from a 3000km road trip and I did not go through even one drop of clutch fluid. Everything worked perfect. I'll be doing this mod to our other 2 getrag cars this summer. Both our V8 Fiero's are now running Getrag 5spds, so at least one part will be cheap to replace on them.

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

VortechGT APR 20, 09:21 AM
So let me make sure I have this right.

You bought a 86 GT Clutch slave, removed the studs, installed on the getrag, used the getrag pushrod and it's been working fine?

I am having slave problems with my 88GT with a soft pedal and I think this may fix my problem so I want to be sure I am doing this right.
Capt Fiero APR 20, 11:27 AM
Yep thats it in a nutshell.

Its not specifically for the 86GT its for any 4spd car. 85GT, 85 2M6, 86SE and 86GT.

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

VortechGT APR 20, 03:20 PM

quote
Originally posted by Capt Fiero:

Yep thats it in a nutshell.

Its not specifically for the 86GT its for any 4spd car. 85GT, 85 2M6, 86SE and 86GT.




Great! I just checked with my local autoparts supplier using your part number and they have one in stock. So I will pick one up this week and give it a shot.

Which bleeding technique did you happen to use after you replaced yours?
pprbart@cs.com JUL 08, 01:52 PM
i have adopted your suggestion of using the isuzu slave for the 5 speed getrag. my situation is somewhat ususual in that is have swapped a 4.3l v6 using archies adapter and a centerforce clutch. all was well until i began having trouble with getting itnot first gear then into others. with the centerforce clutch and pressures plate i needed 1" of slave travel to completely disengage the clutch.
could not get the travel with the getrag slave. went to the isuzu and a longer bolt and eventually got the 1" travel. many thanks for your info. bled the getrag by the archie method and still am getting small bubbles out.

imo, the entire design defies any logic. fluid source flowing downward, then horizontal, then upward. the pressure differntial from high to low is negligible. this is not like brake lines where all flow is downward. the fiero slave is more like a siphon flow. the factory pressure injector is most reliable fluid moving under positive pressure, not subject to the leakge of vacuum or lack of pressure of gravity flow.

hter is so much misinfo out there it is sad. the centerforce people said 1/2" of movement of the pressure plate will release the clutch. nonsense. maybe some other design , not here. i measured to clutch external arm throw needed to release my clutch.
it is 1" minimum. some may take exception, but with the 5speed getrag this is fact.

thanks to members like yourself these cars will survive. i used this chassis to build a lamborghini diablo so my investment in time and money was substantial.
uhlanstan JUL 12, 12:21 PM
Plus,s ++ all around one of the great GREAT write ups on this forum..a real help to Fiero owners

[This message has been edited by uhlanstan (edited 01-09-2010).]

Capt Fiero JUL 12, 01:17 PM
Just another update.

Been running this for roughly 8 months and put it through a ton of speed shifting, so really smacking the pedal down quick and damn near side stepping the clutch.

Stuck in Traffic that got the engine bay so hot, you could actually see the heat waves coming out the rear deck.

Accidentally ran the car so lean that the exhaust from the Manifolds down to the base of the Y-Pipe were cherry red Effectively baking the slave. I did note the clutch pedal did feel "different" however still functioned perfect.

My left leg is totally accustomed to the heavier pedal and feels weird jumping into a normal clutch Fiero. I am going to be doing this same mod to my V8 Fiero with a Getrag in it.

This has been the best 39 upgrade I have ever done to a Fiero.

My only concern now is after all this abuse, I can sorta feel the clutch is starting to go. (I've put 50,000kms on this car, and never replaced the clutch, so I have no ideas how many miles were on the clutch when I got it.)

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

Fieroseverywhere NOV 04, 02:34 PM
So what was the final length of the pushrod you ended up using? I know you used the getrag one but did you end up lengthing it any. I have some steel rod the right diameter that I just need to cut down. Any idea on the length? Anyone know the stock getrag pushrod length?

I just scored a getrag and everything needed to install. The only thing that's missing is the slave. I'm not sure which, but I have 2 sitting around that are either isuzu or muncie slaves would like to modify one to work. I'm not sure which cause I've run both of those trans at different points in this car and just don't remember which is actually on there. I have a cast one on the car but I also have an OEM steel slave sitting on the shelf that would be an excellant choice. It just needs a rebuild. Any help on the rad length would be greatly appreciated.

EDIT: Congrats David on becoming a new daddy!!! Wishing all the best to you a Lisa and of course a big welcome to little Arianna Cassandra Bergquist!!!

[This message has been edited by Fieroseverywhere (edited 11-04-2009).]