What did you guys use to drill the hole for clutch master? I looked through the writeup on top and it looks like alot of people just marked and cut it. Surely someone used one of this drill cutters that cuts a perfect hole right? I am asking because I am horrible with cutting and read that some people had problems with the firewall ripping after cutting.

Also where you cut the tunnel, did you guys just estimate? I looked at all the pictures and some used a tunnel from a manual and others just cut it, but all the cuts look different. Can anyone provide me with an exact measurement?

I am just worried about how I mount the master and screwing up the firewall. I lined up the clutch pedal and tried marking the wall, but I am still afraid I am going to screw up on it.

 

What exaclty is it your are trying to do? Are you going from auto to stick or something? And is it the car in your sig?

 

For the master, the pedals mount/locate off of the brake booster, then you can mark the hole location from the inside and drill out.

For the shifter, I wanted a tight fit, so I mounted the trans in place, and traced along the bottom of the tunnel around the shifter mount on the tailhousing. Then took the trans back out and cut upwards..

 

I located the master cylinder off of the pedals, then for the big hole where the master actually slides through, i used a hole saw. 1 3/4" i think..

 

Mount the pedals and mark where the hole will be with reference to the mounting plate that the U-bolt will go through. You will see a pattern in the plastic for the plate.

I used a 1-5/8" hole saw from Lowes (~$10). I didn't have any problems with the firewall nor the plastic in front of the firewall ripping.

For the shifter, I just estimated based on where I saw other people cutting the holes in the sticky. The easiest way to do this without estimating is to install the transmission and trace like 85MikeTPI said.

 

FWIW, when i did my conversion i used the write up that gm high tech did when they did an a4-m6 swap. Great write up, plus they give dimensions for the holes that need to be cut.

 

Can you please link to the write up. I found a tunnel from a manual car so I think I am just going to weld that in the auto's place.