Tapping transmission case for GT2 slave conversion
Registered User
Joined: Oct 2008
Posts: 1,696
From: Portland Oregon
Rep Power: 188
Positive update!!..... I pulled the slave out (takes 5 minutes now) and shortened the shaft and WOW soo much better.
Here's the deal, all the people that have the high engagement point like i had need to do this because it reduces the pedal effort for some reason. It was a little stiff with the high engagement point but now it's in the sweet spot and is not bad at all.
I was way up on the pedal, about the first 8-10%; i'm down to about 65-75% now. I cut out about 1/4" of the shaft. Now it's about 1/8" shorter than the stock GT2 rod.
John, 1/4" should be the sweet spot for you from what you've told me your car engages at.
Here's the deal, all the people that have the high engagement point like i had need to do this because it reduces the pedal effort for some reason. It was a little stiff with the high engagement point but now it's in the sweet spot and is not bad at all.
I was way up on the pedal, about the first 8-10%; i'm down to about 65-75% now. I cut out about 1/4" of the shaft. Now it's about 1/8" shorter than the stock GT2 rod.
John, 1/4" should be the sweet spot for you from what you've told me your car engages at.
Registered User
Joined: Jan 2011
Posts: 314
From: NoVA
Rep Power: 32
How much longer is the stock rod vs. the GT2 rod? Based on a previous post of yours it looks like it's the GT2 rod is 1/8" shorter? Is that about right?
I don't have a GT2 rod to measure but I'd like to cut the stock rod down to about GT2 length... I just don't want to cut it too much.
I don't have a GT2 rod to measure but I'd like to cut the stock rod down to about GT2 length... I just don't want to cut it too much.
Registered User
Joined: Oct 2008
Posts: 2,321
From: Fastlane USA
Rep Power: 246
How much longer is the stock rod vs. the GT2 rod? Based on a previous post of yours it looks like it's the GT2 rod is 1/8" shorter? Is that about right?
I don't have a GT2 rod to measure but I'd like to cut the stock rod down to about GT2 length... I just don't want to cut it too much.
I don't have a GT2 rod to measure but I'd like to cut the stock rod down to about GT2 length... I just don't want to cut it too much.
Stock Rod: 102.69 mm
GT2 Rod: 91.21 mm
Registered User
Joined: Jan 2011
Posts: 314
From: NoVA
Rep Power: 32
The stock slave is the same between the 996tt and 997.1tt. I couldn't find the part number for the 997gt2 slave, but the 996gt2 slave is the same as the 997gt3 slave.
Registered User
Joined: Oct 2008
Posts: 1,696
From: Portland Oregon
Rep Power: 188
I would like to add that the rod length is not 100% apples to apples. The stock and GT2 slave shaft may very well recess into the slave assembly at different depths. The important measurements are how far it sticks out from the mounting flange and how far it goes into the bell housing.
Last edited by VAGscum; Jan 24, 2012 at 07:18 AM.
Registered User
Joined: Jan 2011
Posts: 314
From: NoVA
Rep Power: 32
True, although I'm basing length off of people's reported clutch engagement points using the GT2 rod and stock rod. While it's going to be just a guess, it gives me a good starting point. I'd like something in between the GT2 rod and stock rod, which should give me a mid to mid/high clutch pedal engagement.
Registered User
Joined: Oct 2008
Posts: 2,321
From: Fastlane USA
Rep Power: 246
I would like to add that the rod length is not 100% apples to apples. The stock and GT2 slave shaft may very well recess into the slave assembly at different depths. The important measurements are how far it sticks out from the mounting flange and how far it goes into the bell housing.
Registered User
Joined: Oct 2008
Posts: 1,696
From: Portland Oregon
Rep Power: 188
True, although I'm basing length off of people's reported clutch engagement points using the GT2 rod and stock rod. While it's going to be just a guess, it gives me a good starting point. I'd like something in between the GT2 rod and stock rod, which should give me a mid to mid/high clutch pedal engagement.
Basic Sponsor
Joined: Apr 2008
Posts: 3,328
From: NorthEast US
Rep Power: 239
I would like to add that the rod length is not 100% apples to apples. The stock and GT2 slave shaft may very well recess into the slave assembly at different depths. The important measurements are how far it sticks out from the mounting flange and how far it goes into the bell housing.
To make an adjustment to the slave only, after the fact is not that big of a deal and then you will have a good idea exactly what you need to do in terms of modification.
__________________
991.2 GT3 RS Weissach Racing Yellow
991.2 Turbo S GT Silver
991.2 GT3 Chalk (Manual)
2022 Cayenne White
former 1972 911T white, 1984 911 3.2 Targa black, 993 cab white, 993TT arena red, 993TT silver, 996TT speed yellow, 991.1 GT3 white
www.speedtechexhausts.com
info@speedtechexhausts.com
Testimonials facebook SpeedTech Exhaust Videos
991.2 GT3 RS Weissach Racing Yellow
991.2 Turbo S GT Silver
991.2 GT3 Chalk (Manual)
2022 Cayenne White
former 1972 911T white, 1984 911 3.2 Targa black, 993 cab white, 993TT arena red, 993TT silver, 996TT speed yellow, 991.1 GT3 white
www.speedtechexhausts.com
info@speedtechexhausts.com
Testimonials facebook SpeedTech Exhaust Videos
Registered User
Joined: Jan 2011
Posts: 314
From: NoVA
Rep Power: 32
I was going to mention this, too. This is good information and should be taken into account before modifying slaves. Plus, I doubt all brands/styles of clutches/pressure plates/flywheels will engage at exactly the same point. I think before modifying slave length, it would be a good idea to install it and see where it engages. There is a good chance it will be fine with no modification.
To make an adjustment to the slave only, after the fact is not that big of a deal and then you will have a good idea exactly what you need to do in terms of modification.
To make an adjustment to the slave only, after the fact is not that big of a deal and then you will have a good idea exactly what you need to do in terms of modification.
Registered User
Joined: May 2010
Posts: 1,062
From: Utah
Rep Power: 106
There is no retaining ring to keep the piston from falling out?
Registered User
Joined: Oct 2008
Posts: 1,696
From: Portland Oregon
Rep Power: 188
Their is, but if you use the stock 996tt shaft instead of the one the slave comes with their is no notch to lock it in. Some people using the adapter bracket are just using the old shaft due to the length differences.
Thread Starter
|
Registered User
Joined: Mar 2011
Posts: 183
From: Florida
Rep Power: 42
If the piston gets pushed far enough it can start pushing hard enough to pop out of the slave and then start pushing against the transmission case........LOL ask me how i know.