Camaro LT5

[Stielow]

Originally Posted by CarlC

Many folks modified the OEM 4th gen part with the "drill mod" in order to increase the flowrate through the MC. Are any other similar modifications needed for the Dorman part?

Carl off memory I think that restrictor was in the stock hydraulic line. Going to the Earls parts with -4 line opens the circuit up.

Some automotive development information. The restrictor is the stock line to help protect the driveline from snap clutch applications. With the restrictor you can’t run the engine up to redline and dump the clutch. The restrictor controls the apply rate of the clutch. If you get rid of it your system reacts faster. Downside your driveline loads go up and you break more parts.


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[CarlC]

Thanks Mark.

BTW, the Wagner replacement MC is made by AP but I too like the aluminum Dorman part (on order....).

[jmac]

Awesome info, great detail.

1) What throw out bearing are you going to be using?

2) For the cruise control, is that only compatible with a factory ECM and not for something like a Dominator?

[Stielow]

If you carefully remove the stock end that designed to hook to the stock 4th Gen Camaro pedal the Dorman part has 1/4 - 20 treads. I run a die down those threads after I remove the crimes on part.

I then use a piece of 5/16 thick wall tubing to make a new rod. Drill and tap one end 1/4 - 20 and the other end 1/4 - 28 for a 1/4 rod end






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[Stielow]

Sorry got ahead of myself a bit. Need to set the length of the rod prior to cutting it.

I mock it up on my table to sort that out.

Copying the stock 4th gen geometry should make the linkage at a 90 degree angle at 1/2 stroke. It you draw a line from the pivot point of the pedal to the pivot point of the rod end the to the center of the master cylinder it should be 90 degrees. This keeps the side load on the master cylinder to a minimum. If you are failing master cylinders most likely your geometry it incorrect and your side loading the master cylinder.

While you have the assembly out of the car and on the work bench also verify the push rod is straight. The centerline of the master cylinder and the push rod should be straight at half stroke. In my setup I had to add two washers to straighten it up.

I later tack welded the washers on the pedal to make it easier to assemble later.




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[Stielow]

I had to clearance the support to clear my bolts.

I use a long stud to make assembling all this in the car easier.




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[Stielow]

Because the LT5 ECM is looking for a clutch switch and I’m adding Cruise control I added a clutch switch also while I was making stuff.



My disclaimer. This works for me and there maybe other ways to do it. I have used this system on the last 5 Camaros with zero issues. I then to revert back to “what do GM do” for a lot of my solutions.

It is amazing the the 1969 clutch pedal and the 1991 pedal are the same length. These setup coupled with a Centerforce clutch make the clutch pedal feel like a stock Camaro.


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[CarlC]

Originally Posted by Stielow

Because the LT5 ECM is looking for a clutch switch and I’m adding Cruise control I added a clutch switch also while I was making stuff.

What type of user interface are you considering to actuate / control the CC?

[Stielow]

Originally Posted by CarlC

What type of user interface are you considering to actuate / control the CC?

I’ve used the Dakota Digital Cruise control (The CAN) based one on 2 projects now and it is truly plug and play. You need a throttle by wire set up.

It works great and has an OE looking turn signal stalk.


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[jmac]

Originally Posted by Stielow

Because the LT5 ECM is looking for a clutch switch and I’m adding Cruise control I added a clutch switch also while I was making stuff.



My disclaimer. This works for me and there maybe other ways to do it. I have used this system on the last 5 Camaros with zero issues. I then to revert back to “what do GM do” for a lot of my solutions.

It is amazing the the 1969 clutch pedal and the 1991 pedal are the same length. These setup coupled with a Centerforce clutch make the clutch pedal feel like a stock Camaro.


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Hi Mark,

Quick question, the additional switch you added to the clutch pedal, is that just like a brake light switch? I'm looking to add this to mine as well.

Thanks!

John