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Hey everyone - I need some help thinking this out.
Last season I went to the strip with largely a stock set up other than the usual CIA and exhaust. I was able to run pretty consistent 15.7s & 15.8s with 2.3 60ft times on junk tires and having to roll into the throttle slowly at launch to have any hope of not spinning the one tire on 3.08 gears.
Fast forward to this year and I've now replaced the stock LCAs to the poly/tubular UMI arms, installed a UMI torque arm with the forward mount on the cross member vs. the trans and had an Eaton 3 series with 3.73 gears installed. Add to that new wheels, 15x4 skinnies and 15x8 rears with MT ET streets. I've shaved off weight by removing the seats, adding a fiberglass hood and a 1 piece aluminum driveshaft.
Slap all that on, I go out yesterday and on my best run of the day run a 15.71 with a 2.27 60ft time. With DA and weather being fairly similar. I ran my ET Streets as high as 30psi and as low as 20. No slipping that I could tell at either end of the PSI range.
What the hell isn't working here guys. I should be much quicker than that right? Some considerations Ive been contemplating are 1) I'm on stock shocks & springs 2) I'm not 100% sure my pinion angle is -2 (there's no vibration but it could be at 0 or -1) and 3) the bushings at the front of the torque arm are a piviot point and to be torqued to like 40 ft/lbs. Well there's no way in hell to get a torque wrench in there so I guess at it. Which is a possibility.
What do you think? Here is my best run of the day:
RT: .002
60: 2.227
330: 6.521
1/8: 10.012
1000: 13.094
1/4: 15.713 @ 85.83
Last season I went to the strip with largely a stock set up other than the usual CIA and exhaust. I was able to run pretty consistent 15.7s & 15.8s with 2.3 60ft times on junk tires and having to roll into the throttle slowly at launch to have any hope of not spinning the one tire on 3.08 gears.
Fast forward to this year and I've now replaced the stock LCAs to the poly/tubular UMI arms, installed a UMI torque arm with the forward mount on the cross member vs. the trans and had an Eaton 3 series with 3.73 gears installed. Add to that new wheels, 15x4 skinnies and 15x8 rears with MT ET streets. I've shaved off weight by removing the seats, adding a fiberglass hood and a 1 piece aluminum driveshaft.
Slap all that on, I go out yesterday and on my best run of the day run a 15.71 with a 2.27 60ft time. With DA and weather being fairly similar. I ran my ET Streets as high as 30psi and as low as 20. No slipping that I could tell at either end of the PSI range.
What the hell isn't working here guys. I should be much quicker than that right? Some considerations Ive been contemplating are 1) I'm on stock shocks & springs 2) I'm not 100% sure my pinion angle is -2 (there's no vibration but it could be at 0 or -1) and 3) the bushings at the front of the torque arm are a piviot point and to be torqued to like 40 ft/lbs. Well there's no way in hell to get a torque wrench in there so I guess at it. Which is a possibility.
What do you think? Here is my best run of the day:
RT: .002
60: 2.227
330: 6.521
1/8: 10.012
1000: 13.094
1/4: 15.713 @ 85.83
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