So I'm not a big drag-racer - in fact, I have a second set of race tires, but they're for road-racing and autocross, I was told they have too stiff a sidewall to use, plus I need to save their tread. So I went out with my street Kumho Supras.

Last time at the track the best I could pull out was a 14.97 in my stock ITR with AEM CAI and PS belt pulled. Last time I had Falken Azenis. This time I returned with JDM 4-1 header and 2.5 cat (still stock exhaust) and instead of Falken Azenis like last time, I had Kumho Supra 712's. Those tires spun all the way through second gear most launches. Finally, near the middle of the night (I ran 15 freakin times) I had an awesome launch (well it felt good) and it just felt like first gear was pulling much better, though still spinning all the way into 2nd. I got a 14.90. The Falken Azenis stuck so much better it's not even funny, but it appears that my 2.4's are nearly the same:

With AEM CAI, PS belt removed and Azenis:
60' .................. 2.4144
330' ................ 6.4344
1/8 ................. 9.7594
1/8 mph .......... 71.86
1000 ............... 12.5587
1/4 ET ............. 14.9739
1/4 MPH .......... 93.22

With AEM CAI, JDM 4-1 header, 2.5 cat, PS belt removed and Kumho:
60' .................. 2.4430
330' ................ 6.4700
1/8 ................. 9.7515
1/8 mph .......... n/a
1000 ............... 12.516
1/4 ET ............. 14.9047
1/4 MPH .......... 94.57

analysis and advice anyone? (besides that I suck at launching obviously)

 

i think those are decent times for what you got, im not a big fan of either of those tire makers...just get some BFG Drag Radials if you really want to lower your 60'.
also,what do you think it should be running? is ET corrected for sea level?

 

Hmmm, I have no idea - how would I find out? The track is in Tulsa Oklahoma

 

call the track and ask em,they should know that

 

I would get a exhaust, advance timing like 2 degrees, run some octane booster and themn go run proly run a little I ran 2 tenths faster by removing ps belt and advanceing timing.

 

same here - ran 15.1's and 15.2's all day and then did nothing but remove PS belt and got 14.9's