CDH76

I'm thinking about going to the 1/4 mile tonight. I'm on street tires in a z51 M7. Tires are SC2's on that stock 20" wheel

I have a set of OEM 18/19's but no tires for them yet.

Anyone ran this setup and on on street tires? What times are you getting?

On the street I have no traction in 1st and a decent amount in 2nd if they tires are warm. Will I still slip a good amount in 1st on a prep track?

Thanks!

C7&7

Use launch control! She will hook.

CDH76

Are you serious? Launch control does not work very well at all! Have you done this and had good results?

C7&7

I use launch control all the time with my pzeros and my r888s. She does ok. However back to your original question I would try to slip it out in second.

CDH76

Maybe I wasn't very clear. I'm just curious about the 1st gear launch. On a prep track I should have full grip in 2nd if I have some warm tires. First is where I'm concerned. I plan on launching around 2k rpm and not going WOT until I'm NLS 1st to 2nd. Just wanting to see what kind of results people get on street tires with 650+ hp.

What times did you run with launch control?

C7&7

10.77 @ 133 with like a 1.8 60 foot on R888s and using launch control.

CDH76

That isn't bad at all. I'm surprised launch control worked that well. I just don't want to drop the hammer at 4K RPM's with this eLSD system. Don't feel like replacing a rear end right now. My 60 will suffer but hopefully not by much.

C7&7

I usually come out at like 3K...and just let launch control handle the slip. I dont have the ***** to launch it any higher.

NoOne

I get pretty decent traction in 1st gear even on the street with 645rwhp. I am amazed actually.

I would try it all out but my guess is short shift 1st gear at around 4500rpm and then 2nd. Once I get over 4500 it just blows the tires off in 1st gear.

It is such a short gear anyways you won't get too far before having to shift anyways.

I'm interested because the traction is so good on the street wonder how on a prepped surface it would be.

I personally would not touch launch control.

Elite275

Are you in an auto? The rpm limit set on the manual is different and completely sucks.

C7&7

No. M7

C7&7

howd she run?

CDH76

Horrible man! It was my first time going and I just couldn't get things going. 1st horrible. No traction at all in 1st and 2nd. Next two runs I missed 3rd. My best run was 3rd run when I missed 3rd gear and ran 11.7. Next two runs I dropped the tire pressure to 26 and had so much wheel hop I didn't even continue throttle. Last run I got side ways in gear 1-3. Not sure why. I never had that problem outside of 1st gear. I won't go back until I have a 18" wheel on drag radial. My best trap was 127 which was horrible (missing 3rd gear). When I ran the Texas Mile I trapped 133 mph and that wasn't even on a prep track.

After those horrible runs I was so frustrated I just tucked my tail and went home. Need more traction.

joemosfet

Launch control isn't active unless the throttle pedal is floored.

jacksnorm

I would not dare try to run my car without tires that will hook. Way to easy to tear up something. With stock street tires you would be better off leaving traction control on and driving off nice and easy not trying to set a record time.

C7&7

maybe for an auto. M7 it doesn't have to be.

joemosfet

^ Pretty sure it does.

NoOne

You do realize that it is the opposite?

Tires that spin put no stress on the drivetrain, tires that hook hard put massive stress everywhere.

jacksnorm

I get your point, but traction eliminates wheel spin/wheel hop not to mention I have seen a few corvettes getting crossed up and into the wall or guard rails. When my car had 650 RWHP it got sideways a few times violently with stock MPSS tires. Now at over 800 I wouldn't dare put them back on unless I was taking a road trip.

Marine1965

I race my Z51 sometimes at our Dragstrip....it is a 1/8th mi track....
I ran 6.69 last weekend 108 mph, 1.58 60'...it has ran 6.50s....I do not use launch control....I put all my settings in track mode, turn off the traction control and stability control....go to Race mode....I do a small burn out on my 18" Mickey Thompson Street ETs that are on 18" Z06 rims...I go to the line...hold my foot on the brake and launch at a complete idle....I never torque it up....the light come down and I put the peddle to the floor and do not let off till the race is over....I have zero wheel spin and zero wheel hop...my car dyno 767 h.p. To the flywheel....it runs 10.30s 1:4 mi the same way...my Z51 comes out of the hole like a rocket....

Everything you are doing is wrong in my experience...try my way...you will be very happy...