Krab

iTrader: (28)

I went to the track tonight, and came home happy, but dissapointed at the same time. I told myself that as long as I came home with a mid 12 second pass, I wouldn't kick myself in the butt. My best runs of the night were:

12.72 @ 113.44 2.09 60'
12.68 @ 112.35 2.03 60'
12.71 @ 112.06 2.04 60'

I was running these times with mods in sig, plus 255/50/16 BFG's @ 17 psi. I was launching at about 2500-3K rpm, and alternating between slipping/dumping the clutch. I'd mostly bog when I would dump it, but spin when I would slip it. How do you guys do it to run low 12 second passes with cam only and sometimes even bolt on only cars? The track prep does kinda suck at my local track, they don't give you an option of going around the water box, you HAVE to go through it, but would that effect my launch that much? What am I doing wrong?

unit213

First and foremost, you should be heating the hell out of your tires. Do you do a good burnout? A 1.7 60' would put your best run at a 12.2 @ 112.06mph. That sounds right for your trap speeds.

edit: It looks like your mph is pretty low for your mods. Are you powershifting? Have you had it tuned?

Krab

iTrader: (28)

Unit, yeah I do a pretty good burnout everytime. I use the linelock and just sit there, hold the rpms at about 4K and heat the BFG's anywhere from 5-7 seconds (lots of smoke).

Moose

iTrader: (5)

I personally think your MPH is low for the package that you have. You also need to imporve on your 60ft. I think you are heating the BFG's right, I think you need more practice.

Have you disconnected the front sway bar?

my car, while probally lighter then yours, was in the 113-115 with most of the basic bolt on's..

unit213

The real problem here IMO is your trap speeds. Something isn't right. An intake/full exhaust car can trap 113mph. When was the last time you had it dyno'd? What kind of numbers did it put down? Also, tell us about the tune.

Tally TransAm

iTrader: (17)

those were the EXACT same times i was running cam only

i really dont think you have anything to worry about, remember lots of the GREAT times will get posted here, whereas very few of the average or bad times will get posted. kinda makes it tough to compare

how was the car comparing to other ls1's at the track that night???

Fred99LS1

I would also expect more MPH with that setup. Forget that for a minute though & consider the current mph. What was your 1/8 mph? You have alot to gain in the 60'. With 113 trap speed you should be going atleast 12.3 on a 1.8 60' time. Alot of those Texas guys are flying, what was the weather & track elevation?

10.5 Dave

iTrader: (5)

I will assume you are new to drag racing.If that is the case practice and more practice will help you more than anything.I improved my times by half a second in my Z06 after getting 20 passes under my belt.One more thing to remember is people only post their best times.I'm sure alot of other people have times similar to yours.

Camaroholic

iTrader: (1)

When I was cam only, with 16" ET Streets, my times were ~12.5-12.6 @ 112.

Only changes made were to 4.56 gears and 28" ET Drags, I ran 11.96 @ 116 in a little better weather. A friend ran an 11.85 pass in my car that same night. Worse weather was 12.1-12.2's @ 113-114.

It's a combination of the tires and the launch, IMO. Stick a 12-bolt back there, rev 'er up and don't worry about when you dump the clutch. I was dumping at about 5500.

-Andrew

Krab

iTrader: (28)

I'm not that new to drag racing, I've been going for the past two years or so, so I have about 50 or so passes. I will admit though, there is more room for improvement and consistency.

Other LS1's were running about the same, or higher times, except guys on E/T streets. Those guys were in the 12.2's or so. My 1/8th traps were about 88.x mph.

I haven't had it dynoed yet, but I will in the next couple of weeks or so. Tuning was done by Chris Robinson, so I'm confident it has nothing to do with that. The only mod I've added since the tuning is an ASP pulley which shouldn't have affected it.

I just don't get it, with an FTRA, lid, cut-out, throttle body and free mods, I was running 12.9x @ 109.xx with a 2.0 60'.

I guess I might have been to easy on my car, after hearing so many horror stories of people grenading their 10 bolt with BFG's. I'll admit I was babying her off the line to play it safe, and you're not supposed to do that if you want to get a good ET. I'll get her strapped on a dyno and post up the results. Any more replies are welcome.

CHRISPY

Are you doing your burnout in second gear?

If not try it and bring the revs up to about 6000 for a few seconds. Makes a BIG difference to traction. Roll out with the tires still spinning and you'll feel them grab.

Makes a BIG difference How is your shifting? are you running a stock clutch? Could be getting clutch slip as well.

Cheers,
Chris

Krab

iTrader: (28)

Dang, I'm not doing 2nd gear burnouts, I thought they were just for bragging rights. I am running a stock clutch though, I don't exactly know what a slipping clutch feels like yet. I've brought the car up to 45 and put it in 6th to give it a little gas, and the rpms don't fly up. On a scale from 1-10, my shifting is probably a 7. Need more practice on the 2-3 shift. I'll go out and practice my shifting and 2nd gear burnouts on a backroad or something.

03AV8R

Dude, your 60's are horrible. Its as simple as that.. If you woulda scored 1.7's (which you very EASILY should be) You would have been in the low 12's.. Its as simple as that.. Low 12's with 1.7 60's that you should already have as a gimme with D/R's.. Your heating tires good so you must be grannying the launch somewhere.. Also try going down to 12 PSI at least 1 launch just to see..

unit213

I agree with you about the 60' time. He's missing about 8-10mph though.

Krab

iTrader: (28)

I also forgot to mention the weather. It was in the 50's that night, and the track is at sea level. No idea on the humidity though. It was raining the night before so it might have still been humid since there really was no sun out on Friday to dry things up. I'm going to give it another try on the 31st, since the track is having free racing night that day.

unit213

Krab- Just make sure you do a good 2nd gear burnout and row like you've never rowed before. You can pick up some mph by powershifting...if you're confident in your skills. Don't want to bend any pushrods or screw up a shift fork.