HellBringer
01-27-2015, 09:11 PM
So I picked up another Supra weekend before last -- '94 TT 6 speed. As such, it was my duty to take it to the drag strip for a general road worthiness check and performance validation. It came equipped with a recently-added intake, downpipe and Apex'i exhaust. Otherwise, it was pretty much all stock/original. I employed the old school bleeder T (18ish psi), a few gallons of Sunoco 110 on top of a 1/4 tank of pump 93, my trusty CCW drag pack and the "5-min true twin conversion". Results as follows:
http://i282.photobucket.com/albums/kk252/AHPowelson/125_timeslips_zpsea0e28c8.jpg
Video:
http://www.youtube.com/watch?v=Q7W5aKqkhMk
1st pass -- knowing I had the stock (and almost certainly original) clutch, I tried to do a quick slip it out of hole around 4500RPM which surprisingly resulted in a bog. 12.0 @ 118.5MPH with a laughable 1.95 60'.
2nd pass -- Let's try a 5500RPM clutch dump in hopes of some tire spin. Yeah.. stock clutch is not impressed -- RPM's shot up and hovered at around 6500RPM until I banged into 2nd. 11.80 @ 118.8 with a 1.81 60'.
3rd pass -- I let the car cool for a good hour. I was a little less aggressive with the launch and it came out of the hole a little harder, but slipped on each gear shift... 1/8 trap was down a lot, so decided to reset the ECU before the next pass. Ended up with 11.89 @ 118.0MPH with a 1.79 60.
Oil down on the track shut things down for over an hour... Almost packed it in since the temp was dropping fast, but decided to make one last pass.
4th pass -- I had high hopes for this pass assuming I could replicate (or improve on) the 60'; the temp had dropped, and the ECU was reset assuring full timing advance. I came out of the hole pretty hard around 5000RPM and blew the tires away (for the first time).. Banged into 2nd, 3rd and 4th and despite what I knew would be a crap 60' and overall ET, I had great expectations for the MPH when near the top of 4th the bottom fell out... I was unexpectedly greeted with a terrible misfire, loss of power, etc... Coast through the traps to 11.9 @ 107MPH with a horrendous 1.91 60'...
Luckily it turned out I blew the (newly run for TTC) vacuum line off the EGCV which resulted in almost a complete loss of boost -- easy fix and no big deal..! Unfortunately the clutch stank and was pissed, the sun was going down so the temp was dropping fast and the track was gone, so we headed home.
Once gain proving the formula -- basic off the shelf BPU is good for solid 11's all day long. With the spring mod and a clutch that held mid-11's and 120MPH traps would be easy. Next up is a new clutch and some general maintenance stuff, then it will be a daily driver. For reference, my Hardtop Supra when it was BPU++ went 11.3 @ 125MPH on a less-than-perfect pass. The key differences were a clutch that held, FMIC, cam gears and spring mod.
For reference, it's Alpine Silver, but has a high-dollar 3M wrap that's very close to the stock RSP:
http://i282.photobucket.com/albums/kk252/AHPowelson/0125151357a_edit_zpsd3afecad.jpg
http://i282.photobucket.com/albums/kk252/AHPowelson/125_timeslips_zpsea0e28c8.jpg
Video:
http://www.youtube.com/watch?v=Q7W5aKqkhMk
1st pass -- knowing I had the stock (and almost certainly original) clutch, I tried to do a quick slip it out of hole around 4500RPM which surprisingly resulted in a bog. 12.0 @ 118.5MPH with a laughable 1.95 60'.
2nd pass -- Let's try a 5500RPM clutch dump in hopes of some tire spin. Yeah.. stock clutch is not impressed -- RPM's shot up and hovered at around 6500RPM until I banged into 2nd. 11.80 @ 118.8 with a 1.81 60'.
3rd pass -- I let the car cool for a good hour. I was a little less aggressive with the launch and it came out of the hole a little harder, but slipped on each gear shift... 1/8 trap was down a lot, so decided to reset the ECU before the next pass. Ended up with 11.89 @ 118.0MPH with a 1.79 60.
Oil down on the track shut things down for over an hour... Almost packed it in since the temp was dropping fast, but decided to make one last pass.
4th pass -- I had high hopes for this pass assuming I could replicate (or improve on) the 60'; the temp had dropped, and the ECU was reset assuring full timing advance. I came out of the hole pretty hard around 5000RPM and blew the tires away (for the first time).. Banged into 2nd, 3rd and 4th and despite what I knew would be a crap 60' and overall ET, I had great expectations for the MPH when near the top of 4th the bottom fell out... I was unexpectedly greeted with a terrible misfire, loss of power, etc... Coast through the traps to 11.9 @ 107MPH with a horrendous 1.91 60'...
Luckily it turned out I blew the (newly run for TTC) vacuum line off the EGCV which resulted in almost a complete loss of boost -- easy fix and no big deal..! Unfortunately the clutch stank and was pissed, the sun was going down so the temp was dropping fast and the track was gone, so we headed home.
Once gain proving the formula -- basic off the shelf BPU is good for solid 11's all day long. With the spring mod and a clutch that held mid-11's and 120MPH traps would be easy. Next up is a new clutch and some general maintenance stuff, then it will be a daily driver. For reference, my Hardtop Supra when it was BPU++ went 11.3 @ 125MPH on a less-than-perfect pass. The key differences were a clutch that held, FMIC, cam gears and spring mod.
For reference, it's Alpine Silver, but has a high-dollar 3M wrap that's very close to the stock RSP:
http://i282.photobucket.com/albums/kk252/AHPowelson/0125151357a_edit_zpsd3afecad.jpg