Tapping transmission case for GT2 slave conversion
#61
01-22-2012, 05:59 PM
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.
#63
01-23-2012, 12:43 PM
Join Date: Mar 2011
Location: Florida
Posts: 183
Rep Power: 40 
I forgot to add, do not make you rod too short or else your slave piston will want to push out of the slave! You want to have the internal spring compress a bit.
#64
01-23-2012, 01:14 PM
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.
#65
01-23-2012, 02:03 PM
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
#66
01-23-2012, 06:08 PM
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.
#67
01-24-2012, 05:00 AM
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; 01-24-2012 at 07:18 AM.
#68
01-24-2012, 08:22 AM
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.
#69
01-24-2012, 09:47 AM
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.
#70
01-24-2012, 05:01 PM
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.
#71
01-24-2012, 07:24 PM
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.
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991.2 GT3 RS Weissach Racing Yellow
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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
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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
#72
01-24-2012, 07:46 PM
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.
#74
01-25-2012, 12:02 PM
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.
#75
01-25-2012, 05:03 PM
Join Date: Mar 2011
Location: Florida
Posts: 183
Rep Power: 40
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.