: First time down the strip
04-12-10, 09:44 PM
Went to test and tune to try my V out at US 41(No Limit) dragstrip. It was busy with about 175 cars, but the weather was perfect in the low 70's. I was hoping for 13.30's @ 110ish. My V is totally stock other than 275/40/18's on the rear. I have driven 3-4 of my former cars down the track.
The first pass I drove through the water, because there wasn't much on the burnout box:tisk: Strangely it was tied for my best 60' at 2.11 seconds. There was wheel hop on every shift, and it got really squirrely at 80 ish mph. The result was a firstname.lastname@example.org.
I aired the rear tires down to 22 psi and went down again right away. It was the best run of the four I made email@example.com with another 2.11 60'. I made a similar run after the car cooled for 3 hours.
I'm pretty happy. A Mustang or GN probably would have gone high 12's with that kind of mph, but I understand that an 4000 lb IRS car setup for the road course is not the ideal drag setup. I would like to get a 12 out of the car and still be able to open track it. Two tenths off the 60' would probably get me into the 12's. Hopefully after my DSS axle is installed I'll be able to do a proper burnout and shave a little more off the 60'. Any other strip tips or experiences you'd want to share?
04-12-10, 10:17 PM
headers and a tune will get you in the twelves i got a 13.1 13.0 and a 12.9 on 255's at the track leaving the whole nice and easy.
04-12-10, 11:46 PM
drag radials after the axels may help, it is my understanding a big smokey burnout does not really help standard street radials much if at all and some claim it hurts traction unless on slicks or drag radials.
04-13-10, 12:44 AM
Glad to see those times and that you didn't blow anything up :thumbsup:
04-13-10, 08:16 AM
drag radials after the axels may help, it is my understanding a big smokey burnout does not really help standard street radials much if at all and some claim it hurts traction unless on slicks or drag radials. I don't really believe in doing big smokey burnouts on regular radials. I do think there is benefit in spinning them until there is a little smoke and pulling right to the line. Both my '91 stickshift KB Mustang LX and '89 Turbo Trans Am were able to pull consistent 1.9 60' on aired down BFG Comp TA's (not DR). I like the hydraulic clutch on our cars a lot, but it's a little too abrupt for me to be able to effectively feather the clutch out of the hole. Maybe with more practice.
04-13-10, 08:49 AM
That's a great run Gus Mahn! Ill have to make it down there next time you guys go. Who all went, and what did they run?
04-13-10, 09:12 AM
Thanks. There were three first gen V's there. I don't know if they want their names posted, but one V had a 150 shot and ran 12.99@120. The other was a stocker with aftermarket wheels and exhaust. I believe he ran only once and ran a 13.50@105. I'll be sure to let you know if we go again. You do the same.
04-13-10, 11:35 AM
12.99@120... damn he must have sprayed the crap out of it on the 2nd 1/8
Yeah really....and still barely breaking into the 12's.
04-13-10, 12:57 PM
Good runs man! I know what you mean about getting squirrely, hitting 4th and passing the 1/4 mile I still felt the rear of my V dancing on 245s.
Next time the other V should not forget to take any pressure out of their tires and run at 39psi :(...the first pass he made at 30 psi broke into 12s....next time 18psi and 275s.
04-13-10, 01:49 PM
Next time the other V should not forget to take any pressure out of their tires and run at 39psi :(...the first pass he made at 30 psi broke into 12s....next time 18psi and 275s.120 mph on a 4200lb (with driver) car works out to 565 hp and the possibility of a 11.40 ET in a car that makes use of traction. I'd bet a high 11 is in his future if he can find some traction!:highfive: Next time I go, I'll also air the fronts up to 50ish psi. Unbolting one side of the front swaybar wouldn't hurt either.
04-13-10, 10:18 PM
120 mph on a 4200lb (with driver) car works out to 565 hp and the possibility of a 11.40 ET in a car that makes use of traction. I'd bet a high 11 is in his future if he can find some traction!:highfive: Next time I go, I'll also air the fronts up to 50ish psi. Unbolting one side of the front swaybar wouldn't hurt either.
You'll learn that those 1/4 mile calculators you use don't work on our Vs. Unless you have a dana 44 or Madman.
04-13-10, 10:36 PM
You'll learn that those 1/4 mile calculators you use don't work on our Vs. Unless you have a dana 44 or Madman.I understand the ET will never be right. Even with a stronger rear, these cars will never 60' like a straight axle, but the mph/hp function should be pretty accurate.
Here is how a straight axle will affect your time.....I am car 62 the other guy was a Fox Body with a straight axle (I don't know why the 1/8 didn't register).
Is the general consensus around 20 PSI in the rear at the strip, or less? What about the fronts?
04-17-10, 09:25 PM
18 PSI in the rears and go to 50 PSI in the fronts. Drive around the wet box on street radials. A burnout is useless on street tires.
And a lil ol' school reaction time reduction trick is to use your emergency brake at the line. The reaction time is less from your brain to your hand (I use a small piece of coat hanger hooked onto the brake release lever as an extension) than from your brain to your foot.
04-18-10, 01:39 PM
I have taken a bunch of my cars to the strip and the wheel spin nets you more MPH versus getting grip at the line. I do not recall the numbers from my Impala SS. So, as an old recall:
My stock 87 Mustang with a solid axle did 13.5 @ 102 with 4.11 gears on street drags. Normal street was about 13.9 @ 105. Stock with 3.08 was 14.4 @ 99.
The 87 Grand National did 12.4 @ 110 MPH running in neutral for the last 100 feet or so (did not want to break 11 in those days - roll cage required). On a private track test, it did 11.7 @ 122 on Hoosier Drag ET's. So, when you see some runs where the ET is really low and the MPH is also low, they could have bagged the end of the run for some reason.
The Nissan 330 ZX Twin Turbo did 13.9 @ 101 back in 1990. That was my first intro to IRS. With a bad launch, it was more about 14.5 @ 103. I think with better gearing, even on the stock IRS rear setup, the car would launch a little harder, get a little less wheel spin and resultant wheel hop for a better ET but lower MPH.
My stock CTS-V on a cold day (39F) had no grip, hopped all over the place (launch, 1-2, 2-3) and did 14.1@ 107 with a 2.476 60 foot. I tried launching a little nicer and got the 60 foot down to 2.323 and did 14.1 @ 104. I was hardest car to launch that I have ever driven (highest weight IRS vehicle).
I know it is a limited result set, but I have seen similar from others, as well. More grip, better launch, lower ET, lower trap speed with race tires versus the street tires where the lauch is sacrificed but trap speed increases quite a bit. So, with good axles and sticky tires, I suspect to see a V visit the 12's at about 105 or so.
04-18-10, 04:01 PM
I have taken a bunch of my cars to the strip and the wheel spin nets you more MPH versus getting grip at the line. I don't think that wheelspin gets you more mph. Sticky tires have soft sidewalls and high rolling restistance. You trade mph for grip when running them, and losing 2-3 mph is not uncommon.
04-18-10, 04:36 PM
I don't think that wheelspin gets you more mph. Sticky tires have soft sidewalls and high rolling restistance. You trade mph for grip when running them, and losing 2-3 mph is not uncommon.
True, a softer tire will have more rolling resistance, but I noticed the same benefit on a good 1.9 60 foot versus a 2.3 60 foot with the same radials and the same PSI. ET went up on the poor 60 foot but MPH improved.