anyonebutme
05-08-2013, 12:21 AM
I met up with the Maddog crew at Road America for the MFBA/Midwest Domestics track car May 4-5. Brought out the Stealth for some testing. Goals were to have fun, learn the track, and do some testing on the car. Was taking temps of various parts with IR gun, while the main focus was testing the cooling system mods to rid overheating issues on track. Coolant was under 20% glycol, 2 bottles of water wetter, tap water. Only new additions to the "cooling system" was front splitter, a ghetto front turbo heatshield made from a license plate, and 2nd water wetter bottle.
Before I move into the videos and other bad news, cooling system report was positive. Cooling system never rose over 95*C throughout the first day, barely reaching 90*C on the sessions I limited to 100MPH due to [possible] driveshaft vibrations. 2nd day tested the cooling system without the splitter, resulting in temps climbing to a tad over 100*C, but stable. Much better than before. I'm satisfied that at my current power level, overheating issues have been resolved for me. My new datalogger, however, decided to give me fits. None of the sessions where I drove through the driveshaft vibrations recorded. The vibration was violent, so I guess it's not surprising.
Day 1: Started out cool, partly sunny. Got decently warmer for later sessions. Think high around 60-65. After a session was cut short due to 2 accidents resulting in 2 cars being totalled (both drivers OK), and our class being scolded for over aggressiveness, day settled into routine. Suprise visit from Jesse results in drooling over his "dirty" engine bay. Also results in convo about lack of action here. Last session car stumbles and dies coming out of turn 5, results in argument with safety personnel who are convinced that towing my car on 2 wheels is acceptable. Also results in flatbed unable to hook onto my car from the front, so in desperation I get in the car, floor the throttle, and attempt to drive it on the bed. Works. Back to pits aboard tow truck to the enjoyment of gathered 3S owners. Turns out intake pipe blew off the rear turbo. Also got some line mod advice from lead instructor.
http://www.youtube.com/watch?v=DeD6aQEqG0s
http://www.youtube.com/watch?v=OcoaHycH-Dw
Decided to try to drive though vibration, worked. Scary.
http://www.youtube.com/watch?v=r-mSr-ibIxA
http://www.youtube.com/watch?v=Y2mkQn3vSgA
Day 2: full sun, warmer. Started out bad and got worse. I crashed first session, totally my fault. Missed the downshift into 3rd, upsetting me and maybe the car a bit, entered too hot for the cold tires and cold track, and M5 behind me reported I locked up the rear tires possibly. Almost recovered but biffed the ending. No controls were datalogged so I can only guess at what I did wrong. Intake pipe came off from impact, but safety crew unplugged MAS and I drove back to pits to the relief of safety crew. Anyways, not gonna stop me. After removing the broken headlight and stabbing myself in the process, resulting in a chunk of glass and piece of glove imbedding itself into my thumb, proceeded to make car drivable. Ducttape thanks to brent, went back out. Got cheered by the flagman I crashed next to. Splitter then detached at 120+MPH due to unseen damaged mounting bolts and broken support rod from accident. Come in, remove splitter, go out, all in same session. Most flagmen are watching my car closely by now for shit falling off. Noticed loss in front end grip and cooling ability. All is well in my world again....... 2nd to last session of day, engine looses 2 cylinders on first hot lap, come back in, coil not firing, called it a day. Got a ride in another instructor's car, turns out I was underbraking everywhere, and the datalogs confirmed. Too much dirty autoX driving got me used to lower braking ability before lockup I guess. I was still outbraking street tired cars, but wasn't braking to the ability of my race tires. Something to work on. Results in no flat spotted tires at least, lol.
[videos in next post, 5 video limit WTF?]
Other information gathered:
Oil temp: 90-110*C depending on how long I was WOT.
Front rear brake temp delta (355mm front brakes): 12-15% rear brake rotor hotter.
transmission temp: 180*F
Rear diff temp: 180*F
Xfer case temp: 210*F
All temps are case temps, guessing oil is about 50* hotter due to case cooling by airflow.
Before I move into the videos and other bad news, cooling system report was positive. Cooling system never rose over 95*C throughout the first day, barely reaching 90*C on the sessions I limited to 100MPH due to [possible] driveshaft vibrations. 2nd day tested the cooling system without the splitter, resulting in temps climbing to a tad over 100*C, but stable. Much better than before. I'm satisfied that at my current power level, overheating issues have been resolved for me. My new datalogger, however, decided to give me fits. None of the sessions where I drove through the driveshaft vibrations recorded. The vibration was violent, so I guess it's not surprising.
Day 1: Started out cool, partly sunny. Got decently warmer for later sessions. Think high around 60-65. After a session was cut short due to 2 accidents resulting in 2 cars being totalled (both drivers OK), and our class being scolded for over aggressiveness, day settled into routine. Suprise visit from Jesse results in drooling over his "dirty" engine bay. Also results in convo about lack of action here. Last session car stumbles and dies coming out of turn 5, results in argument with safety personnel who are convinced that towing my car on 2 wheels is acceptable. Also results in flatbed unable to hook onto my car from the front, so in desperation I get in the car, floor the throttle, and attempt to drive it on the bed. Works. Back to pits aboard tow truck to the enjoyment of gathered 3S owners. Turns out intake pipe blew off the rear turbo. Also got some line mod advice from lead instructor.
http://www.youtube.com/watch?v=DeD6aQEqG0s
http://www.youtube.com/watch?v=OcoaHycH-Dw
Decided to try to drive though vibration, worked. Scary.
http://www.youtube.com/watch?v=r-mSr-ibIxA
http://www.youtube.com/watch?v=Y2mkQn3vSgA
Day 2: full sun, warmer. Started out bad and got worse. I crashed first session, totally my fault. Missed the downshift into 3rd, upsetting me and maybe the car a bit, entered too hot for the cold tires and cold track, and M5 behind me reported I locked up the rear tires possibly. Almost recovered but biffed the ending. No controls were datalogged so I can only guess at what I did wrong. Intake pipe came off from impact, but safety crew unplugged MAS and I drove back to pits to the relief of safety crew. Anyways, not gonna stop me. After removing the broken headlight and stabbing myself in the process, resulting in a chunk of glass and piece of glove imbedding itself into my thumb, proceeded to make car drivable. Ducttape thanks to brent, went back out. Got cheered by the flagman I crashed next to. Splitter then detached at 120+MPH due to unseen damaged mounting bolts and broken support rod from accident. Come in, remove splitter, go out, all in same session. Most flagmen are watching my car closely by now for shit falling off. Noticed loss in front end grip and cooling ability. All is well in my world again....... 2nd to last session of day, engine looses 2 cylinders on first hot lap, come back in, coil not firing, called it a day. Got a ride in another instructor's car, turns out I was underbraking everywhere, and the datalogs confirmed. Too much dirty autoX driving got me used to lower braking ability before lockup I guess. I was still outbraking street tired cars, but wasn't braking to the ability of my race tires. Something to work on. Results in no flat spotted tires at least, lol.
[videos in next post, 5 video limit WTF?]
Other information gathered:
Oil temp: 90-110*C depending on how long I was WOT.
Front rear brake temp delta (355mm front brakes): 12-15% rear brake rotor hotter.
transmission temp: 180*F
Rear diff temp: 180*F
Xfer case temp: 210*F
All temps are case temps, guessing oil is about 50* hotter due to case cooling by airflow.