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thstone · 08-04-2019, 03:56 PM

I am way behind in updates, but I'll just start with today's fun.

At the last race, the clutch pedal went to the floor and stayed there. I reached down with my toe and pulled it back up and it worked normal again for the rest of the race and the drive home. Disaster averted.

So I order a replacement slave cylinder and go out to swap it this morning. Instead of the expected clip-style clutch line retainer, I find that this slave has a hard line with a nut that screws into the slave cylinder.

WTF? This ain't gonna work.

So I check the numbers on the transaxle and find that they aren't where I expect them to be. Curious.

Searching around the trans and I find "VW Audi LAU 012 301". A quick search on this forum and I find that I have an Audi A4 transmission.

Then I do a little bit more searching and find that the hard line slave cylinder is from a Boxster S.

Then I'm worried that the gear ratios might be different between the Porsche and the Audi transmissions (even though both are Audi!) and if so, then maybe I need to swap a Boxster trans back in so I don't have any advantage or disadvantage.

I do another search and find that there is a 0.2 difference in 1st gear. 2nd and 5th differ by 0.06 (or less) and 3rd and 4th are exactly the same. The final drive ratio is also the same.

So I'm not going to worry about these minor differences in gear ratios and just replace the slave cylinder with the S version and get it ready to race again!

Anyone need a 97-99 slave cylinder?

Audi LAU 012 301 transaxle...

I was expecting to find a 97-99 2.5L slave cylinder (this is the new replacement that I bought)...

But I found an S model slave cylinder (that you can see was leaking so this definitely needed to be replaced)...

08-04-2019, 03:56 PM	#1274
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	I am way behind in updates, but I'll just start with today's fun. At the last race, the clutch pedal went to the floor and stayed there. I reached down with my toe and pulled it back up and it worked normal again for the rest of the race and the drive home. Disaster averted. So I order a replacement slave cylinder and go out to swap it this morning. Instead of the expected clip-style clutch line retainer, I find that this slave has a hard line with a nut that screws into the slave cylinder. WTF? This ain't gonna work. So I check the numbers on the transaxle and find that they aren't where I expect them to be. Curious. Searching around the trans and I find "VW Audi LAU 012 301". A quick search on this forum and I find that I have an Audi A4 transmission. Then I do a little bit more searching and find that the hard line slave cylinder is from a Boxster S. Then I'm worried that the gear ratios might be different between the Porsche and the Audi transmissions (even though both are Audi!) and if so, then maybe I need to swap a Boxster trans back in so I don't have any advantage or disadvantage. I do another search and find that there is a 0.2 difference in 1st gear. 2nd and 5th differ by 0.06 (or less) and 3rd and 4th are exactly the same. The final drive ratio is also the same. So I'm not going to worry about these minor differences in gear ratios and just replace the slave cylinder with the S version and get it ready to race again! Anyone need a 97-99 slave cylinder? Audi LAU 012 301 transaxle... I was expecting to find a 97-99 2.5L slave cylinder (this is the new replacement that I bought)... But I found an S model slave cylinder (that you can see was leaking so this definitely needed to be replaced)... __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor Last edited by thstone; 08-04-2019 at 03:59 PM.