Things I learned at a Dr. Evil Transmission Clinic, (McMarks Coffee Sucks) |
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Things I learned at a Dr. Evil Transmission Clinic, (McMarks Coffee Sucks) |
ConeDodger |
Dec 13 2009, 02:29 PM
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#1
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Apex killer! Group: Members Posts: 23,612 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
First of all, my transmission had just been rebuilt a year or so before and at that time had a billet intermediate plate and Guard Torque Biasing Differential installed at that time. Issues discovered during that rebuild were the bearing in the stock intermediate plate had a cracked race which I hear is common, and synchro replacement was needed in gears 1 through 3.
So, I was opening a fresh box and should expect to find fresh parts without wear. right? My first gear synchro which again was new, showed pretty significant wear. My first gear dog teeth were pretty worn as well. The dog teeth wear would never have gotten by the guy who rebuilt it. He would have replaced it during the rebuild. Lesson one: never downshift your 901 into 1st gear while you are moving. It seems that even though it has a syncho it will not tolerate that. I changed to M 3rd and S 4th gears. I left the Zd 5th on the advice of the learned DNHunt who knows a bit about teeth in humans as well as transmissions. Lesson two: this is a very nice gear set for street driving in traffic with lights and stop signs. I expected it to be a great autocross/DE transmission but what I didn't expect was to be able to cruise down Sunrise Blvd. in 4th gear without any urgency to downshift. In short, it isn't so "busy" in traffic. Lesson three: with all due respect to the Capn who says transmission gear oil does not need to be changed, I have to agree with the Evil Dr. My fresh gear box had a little metal Chia Pet attached to the magnet after only a few thousand miles. The Dr. says change it after the first thousand miles. I agree. |
ottox914 |
Dec 13 2009, 07:37 PM
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#2
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The glory that once was. Group: Members Posts: 1,302 Joined: 15-December 03 From: Mahtomedi, MN Member No.: 1,438 Region Association: Upper MidWest |
For autocross, not DE or track, how did you like the diff? From driving other cars with LSD, they can add a "push" to an auto cross car, where as on the track its much more better.
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ConeDodger |
Dec 13 2009, 07:53 PM
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#3
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Apex killer! Group: Members Posts: 23,612 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
For autocross, not DE or track, how did you like the diff? From driving other cars with LSD, they can add a "push" to an auto cross car, where as on the track its much more better. Dave, I have not had the car on the track for any purpose. I have autocrossed it with the differential. It is not an LSD. It is a torque biasing differential. Paul Guard who owned GT Racing until recently suggested that a torque biasing differential was better for autocrossing which is my primary leisure activity with the car. Rather than lock both wheels into propelling the car, a torque biasing unit transfers the torque to the wheel that is not slipping. I have not felt anything like push. Here are some pictures at an autocross a couple weekends back. I am running my street tires which are 300 wear rating and the only time it didn't go exactly where it was pointed was when I over modulated my brakes. Then I would go straight (IMG:style_emoticons/default/blink.gif) The car has a Tarret front bar, stock rear, stock torsion bars, Elephant bushings, monoballs front and rear, koni adjustables. Very flat in corners. Attached image(s) |
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