Rep Power: 363

alright, well ... I'll give everyone a little background first. This was my first time at any track, I left my car full interior .. nothing was taken out ... tire pressure was kept the same as I would run it on the street (roughly 44? psi) ... basically nothing was touched.

elevation was 1100 feet, temperature was ~78 degrees, there was a little bit of wind, the track was at California Speedway in Fontana

Ok, I ran 4 times.
my first run was HORRIBLE ... my shifter popped out of first gear after my launch:

1st run

R/T: .983
60': 3.131
1/8: 10.629
1/4: 15.633
mph: 99.6

2nd run

R/T: .531
60': 2.422
1/8: 9.380
1/4: 14.315
mph: 99.51

3rd run

R/T: .581
60': 2.541
1/8: 9.763
1/4: 14.814
mph: 97.52

final run

R/T: .666
60': 2.400
1/8: 9.393
1/4: 14.362
mph: 99.60

I'm not at all disappointed. I just need to work on my launches. Mods:

K20A
Injen CAI
17x7.5" SSR Comp - 215/40/17 GY Eagle F1 GS-D3 tires
Nextgear Intake Mani Gasket
no p/s
~150 pounds weight reduction

stock everything else.

on my final run, I thought about my dyno numbers ... and how rich I was running after 7500 rpms ... so I decided to shift at 8000 rpms instead of 8500 ... but I think I could've gotten a 14.2 if I had shifted at 8500 ... considering that my 1/4 time compared to my 1/8 increased, comparing my 2nd and 4th run.

 
Rep Power: 336

way 2 go. im still workin on breakin outta the 18;s lol

 
Rep Power: 312

damnit derek....you shoulda told me you were going to the track....i would have gone too.

 
Rep Power: 294

Thats freaking good dude 14.3 thats really good. If you can improve your 60 you will be in the 13s next time. Good luck

 
Rep Power: 404

thats good, im telling you, you need better launches.... i'll be there for sure on the 12th...

 
Rep Power: 302

same here

 
Rep Power: 404

i posted this in Socal

 
Rep Power: 813

not bad at all. but that seems a bit high isn't tire pressure supposed to be 30 or something?

 
Rep Power: 363

hm I read somewhere that as you change the size of your rims (or was it profile?) that tire pressure needs to change accordingly...

I could've sworn the receipt for the tires said ~44 psi ... but I could be wrong. I'm pretty sure the tire pressure is pretty high right now ...

 
Rep Power: 294

yeah that does seem pretty dam high

 
Rep Power: 312

next time ill go and see if my car can even do 18s.

 
Rep Power: 813

you don't go by the pressure on the tire. you go by whats written on the car. if its a civic ex, then 30psi for 15" rims. yes you do change with the rim size I believe, but I don't know how to figure that out.

 
Rep Power: 363

rob: I'm sure you'll do better than 15's ... just take your spare out and take out your power steering pulley for the runs ... it's not like you're gonna be using it when you go straight anyway.

gear: yeah ... I remember something like that ... different pressure for different sized rims ... anyone know what the recommended is for the 215/40/17 ???

 
Rep Power: 363

updated 1st post with all info

 
Rep Power: 401

i dont think he'll hit 13's with his current setup.

 
Rep Power: 312

i would like to break 15s....im gonna take out my system, spare tire, front seat, rear seats, and whatever else i can to shave some weight.

if i take out the ps pulley, is the tensioner gonna be enough to tighten it? or am i gonna need to get a spare serpentine belt?

 
Rep Power: 363

^ don't take out the pulley ... just take out the belt. I think it's just like 4 bolts and then you can loosen then tension on the pulley and it'll slip right out.

 
Rep Power: 312

ohhh..got it. Ill have to do that

 
Rep Power: 0

Your tire pressure was super high. Your front tires should be around 18-20 psi (even on stock tires).

 
Rep Power: 0

I think that the complete missconception is that time taken off of the 60ft works on a 1:1 ratio, it does NOT (i.e. .433 seconds taken off of the 60ft does NOT = .433 seconds faster in the 1/4). I am not to sure on the exact #, but it is atleast 1:1.5. So .433 seconds off of the 60ft would = somewhere around a .65 reduction in the 1/4mile. So if we take his 2.422 60' and reduce it to around a 2.1(more than obtainable with his current setup) he will run around a 13.9xx. So with his setup and a decent launch (not even a great one) 13s should be no problem.

 
Rep Power: 0

WHAT?!?!?! Tire pressure should be aound 27-35 psi. Depending on how rough or smooth you want them to ride. 18-20 psi will cause major sidewall damage, don't listen to this guy.

 
Rep Power: 0

I almost forgot that 14.3xx was at a higher altitude. So 13s should be not problem at whatever altitude you ran at. Corrected you could hit 13.7xx with a decent lauch.

 
Rep Power: 0

Everybody I have talked to at the track lowers their front tire pressure down to 18-20 psi for drag racing.

Daily driving pressure is 32 psi BTW.

 
Rep Power: 0

Oh ok, I thought you meant DD at 18-20 psi. My bad...