idoke1

iTrader: (5)

Yesterday night, I was at sacramento raceway trying to get 12s. My car is stock but for the exhaust pipes. My best time i could do was 13.2 @ 108 mph with a 2.1 60 ft. I ran 3 times and all times was pretty consistent. For all those who do drag race, how did you manage 12s on street tires or with the stock 19s? I just could not get my PSS to bite off the line. I may need to brake torque but at what RPM? I tried feathering off the line, holding 1000 rpm and feather that off the line and it did not bite. For the last run, I smash the gas pedal on green and i still couldn't bite. Any help will definitely be appreciated.

Vervish

iTrader: (4)

I am no drag racer but I think you need to lower your tire pressure..

lorenr

iTrader: (1)

2008 means no limited slip thus no traction on the starting line. You should have gotten in on that group buy for the OS Giken limited slip carrier. Having both rear wheels hook evenly will drop your 60 foot time a lot, which is everything.

I also think that with street tires it is not a matter of air pressure but "even" contact with the starting line surface.

You may also need drag racing tires.

BS ISF

^^^this is completely false! I have cut 1.87 60' times on 275/30/19 RE-11's at normal psi. there are way too many factors that could lead to you not hooking up. lowering tire pressure could have helped possibly, track prep and DA are the two main factors. check to see what the DA was on that day at that track. also, just do a small burnout to clean off the tires and do around the water box. a ton of info in the drag thread so look at that. my best has always been just leaving off idle and mashing the gas and shifting after the beep.

jat0223

iTrader: (1)

This highly depends on location, weather conditions and track prep. If conditions are well, just mashing the pedal and shifting after kissing the limiter is enough to get good times well under 13s.

idoke1

iTrader: (5)

I'm going to assume the track was not prep well. I saw a 2010 STI running 13.7 and a 2014 STI running 14s. The 2010 had a cobb tune and full exhaust. The 2014 was stock. I think for me to really get 12s, i will need the track well prep. At the same time, i also saw a 2015 mustang with exhaust hitting 12.6s @ 111 mph. Thats pretty darn good if all he had was exhaust. It could had been tuned but i didn't spoke to the owner. There are a lot of factors but to those who did run 12s, was the track prep well for you to achieve that time?

iH8RICERZ

iTrader: (3)

Sac raceway is terrible for track prep... especially on the wednesday night fun drags. There are just too many cars trying to get runs in that the track prep sucks

jat0223

iTrader: (1)

Yes track prep and weather conditions were favorable. I even messed up one of my shifts by holding it for too long and hitting fuel cut off but still managed a 12.7 @112mph.

darbs242

iTrader: (5)

Go to the track when it's cold outside, take out your spare, jack, make sure your gas tank is almost empty. Turn vsc off, sport mode on, solid 1st threw 2nd burn out. Wait till the second yellow light goes out, take your foot off the brake and floor it with a set of rear slicks = 12s and if your good with a full exhaust you might find 11s. Nitrous will find you 11s for sure.

WillK

Adjusting tire pressure is a double edged sword. What you gain in your 60' time you'll probably lose on the top end. Practice your launch. I'm not familiar with best launch for IS-F but it should be easy to get it below 2.00 with stock set up and street tires.

SuprFleaJQ

So it's best to just let your foot off the brake and mash the gas? No brake torque necessary for the best times?

caymandive

iTrader: (2)

The IS-F should run 12's all day everyday with minimal prep at most drag strips. Low fuel, remove extra items in trunk and a careful launch with adjusted tire pressures for the track conditions. I've gone to the track from freezing to hot and have never been in the 13's without totally blowing the launch.

Track elevation is another thing to watch for however. What is the elevation at Sacramento?

H1_OFICR

Were you on slicks when you ran your 11.87?

caymandive

iTrader: (2)

Yes and at least two members here including myself have run a 12.0 on street tires. Only reason to run drag radials is if the temps are too cold to get a descent launch no matter what tire pressure you try on street tires.

To get into the 11's without N2O you NEED cold temps (55F or cooler), low track altitude, moderate weight reduction and a bit of tail wind and experience doesn't hurt either.

idoke1

iTrader: (5)

I'm not sure what elevation sacramento raceway is too? I did found this link and i'm not sure if its right.

http://www.dragtimes.com/da-density-...calculator.php