Okay, i have a question for all you drag racing guys out there. A while back i ran my car at the drag strip just to prove to some haters that it could indeed hit 12's. took me a couple tries to do it because i'd never really launched the car before because i'd only used it for autocrossing/road racing. never had a reason to drag it before.

my first time at the track i made 4 passes and ran a best time of 13.6... i was embarassed/pissed because i knew the car could do better. well i went out to the place where we do autocrosses and practiced launching that night. i don't like not being good at things, so this was something i had to get right. my next time at the track my best time out of 3 passes was a 13.1. the other two passes were 13.2 and 13.1. i still wasn't happy, so i went to the track for a 3rd time and hit 13.01 twice. every one of these passes was made at night, and in cold weather. i was unable to get around the water box so i spun tires on every launch. the best 60' i was able to pull up until that point was a 1.92.

well, then i went to give it one more shot. same deal as before, cold, wet tires, also overinflated to around 44psi. still spun a bit, but managed to pull a 12.9 on my first run, then missed 2nd (hand slipped off the shifter) and did 13.2, then on the third run did a 12.82 @ 107.41. here's a link to the original thread: 12.82 @ 107.41 with slips.

i didn't know this at the time, but i wasn't just fighting the cold/wet/overinflated tires. turns out i was also dealing with this: Boost leak i didn't know i had at the time.

the mods on the car at the time were the same as the mods i have now, only i was on the stock clutch still. the only power adders were the HKS catback, and a dirty K&N drop in filter. no tune (still no tune now).

My question is how much more speed do you think is in the car given the fact that i only managed a 1.86 60', and had that boost leak at the time i ran it last? now that i've found the boost leak and fixed it, i was thinking about taking the car back to the track and seeing what it can do at full power. the only difference now is that the car has 128,000 miles instead of the 50,000 it had then.

this is just my unprofessional opinion, but i think dropping my 60' to a 1.6-1.7 should be enough alone to get me into the 12.6 range. not sure how much more speed i should pick up now that i'm boosting properly again. what do you guys think? also, given the gremlins i was facing at the time, do you guys think 12.82 @ 107.41 was a good time?

thanks in advance.

 

still............... ballin.

 

Lots of guys can get 1.75-ish 60's with the right launch, and the rule of thumb is that ever 1/10th in the 60' gets you 1.5 or 2/10ths in the 1/4, so 12.6-something should be about right for a 60' improvement.

On the boost leak - it's hard to say. On my car, I found two significant boost leaks, and even though the butt dyno said the car certainly had to be faster, I didn't pick up any HP. Dunno why.

The 12.8 seems about right to me. Get an engine management system and pick up 20-30 HP easy.

Tom

 

Fixing the boost leak will probably just make the turbo not work as hard. If the boost is still set as the factory intended, the stock turbo can support a slight leak and still hold the boost, but it'll probably spool quicker with the leak fixed, and not work the turbo so hard to do it.

 

Your car needs a tune badly. Get a tune & you will make your goal.

 

i don't want to tune the car. i want to leave it the way it is. i ran a 12.82 with a boost leak, and stock tune so i don't really think the tune is a hurting me at all. i've run 129k miles on the stock tune and it's fine.

 

damn 128k on an 06 is nuts.

but yes you do need a tune.

 

i agree, a tune would do nothing but good...but why do you say i NEED one when the car is running 12's with just a catback and boost leak?

 

casue its free horsepower man.

i ran a 12.6 with a BR intake and mbc and a tune. everything stock.

 

that's not stock.

 

126k!?!?!

Dood, wow....and yes, get a tune. You will need it. [:

 

130k miles now