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ACT Performance Clutch releasing very close to the 1991 Toyota MR2 floor.
I did some more research in 2015 after Troy Trugleo raced my car. He complained a lot. We had just grown used to the pedal release point. I was at a loss as to what to do.
I searched the internet for a few days, weeks… and then months.
I found a thread on a Honda forum that discussed this same issue. The OP was using a ACT racing clutch and the release point was on the floor. It was discovered that the ACT pressure plates are made by Exedy. They also make a few other “performance clutch pressure plates”. The Exedy made pressure plates have a shorter height as compared to the OE Honda pressure plate. The height is only by a millimeter or so. The fix was to put a washer under the release fork pivot stud.
I was then speaking with Gouky who had said he was having a hard time keeping E153s working in his V6 race car, and he mentioned another endurance race team was having the same issues.
I mentioned my finding on the Honda forum. He suggested trying to fit a body panel spacer U-washer in through the access hole. I tried doing it on a E153 that was out of the car and to me and my fat fingers there was just not enough room.
So two weeks ago at Watkins Glen we lost a transaxle when the front engine mount bolts broke and shoved the transaxle into the frame rail. Here was my chance to test the theory.
I used a regular off the shelf washer. It was between 1 and 2 mm thick. Well used but clean. No clue where it came from. I unscrewed the pivot stud under the shift fork, and put the washer on the stud and torqued it back into place.
After reinstallation of the new transaxle we tested it.
Release is now where OE release is, in the middle of the clutch pedal arc. Shifting is much more precise as the gear shafts have more time to slow when you shift gears, thus slowing the wear on the sychros.
Now I am working on a fix for the wearing of the nylon bushing that is on the number 2 shift fork. I think that by using the solid shift cable bearings/brass bushings, that too much pressure from the shift input is being applied to the nylon bushing to the shift hub that causes abnormal wear.
The fix would be to use BRD Polyoxymethylene bushings at the end of the transaxle side of the shift cables. I think this will allow a 30% less force to the nylon, while still allowing for an accurate shift feel. More on this after we test it at Charlotte over the 4th of July weekend
A few early announcements for 2015! First off we are building another car. A 1992 Toyota MR2-GR will join the #79 MR2 GTv6 in ChumpCar, WRL and AER racing events in 2015. The new car 179 will be powered by a 275hp Toyota 2GR-FE V6.
Zipline Welding Booms and McKibbin’s Irish Pub Montreal will continue their support of RSm cars in 2015. Lincoln Electric will again be our official supplier of welding equipment. MR2Guru.com will be the official RSm OE used and new parts supplier.
Porterfield.com is now the official brake supplier for the Raybestos race brake pads. New for 2015 we have inked a deal with AutoMeter to supply race winning gauges so my drivers can keep up to date on the condition of our V6 engines.
FrakensteinMotorWorks.com will be supplying the needed parts to complete the monster motor swap into the MR2 chassis. Moroso will again be supplying oil products from Accumulators to Aluminum Oil Pans.
Racing Strong will again be working along sideTruleo.com to develop new and exciting products for the Toyota Mr2 that are race proven. A new big brake system using Toyota / Lexus OE parts and custom Raybestos pads is just one of the new systems that will be available soon.
beyonddrivenauto.com is now the official RSm race and utility light supplier!
I know you just want to see the data! You will need to have a PDF reader installed to view these.
1991 Toyota MR2 N/A
1991 Toyota MR2 Turbo
RSm’s 1991 Toyota MR2 GTv6 finished 3rd in the 2013 Optima Batteries ChumpCar World Series Eastern Division Championship at VIR.
Ice and freezing rain could not stop the power and reliability of the Camry V6 powered MR2 against some of the fastest machines in the ChumpCar series.
Gene Bird, Mike Helm and Bill Strong piloted the MR2 RSm’s best finish in 4 years of racing in the ChumpCar World Series.
2014 brings some big changes to RSm and endurance racing. 8 races planned with more possible.