boostedrs

iTrader: (2)

Well recently I purchased some Mickey Thompson ET Street Drag Radials on some z06 wheels. They are 275/45/17 and they have about say 70 % tread left so they aren't brand new. I bought these figuring they would HOOK hard on my car on the track. Well It seems I have tried everything possible to try to hook on these tires at the track... My previous best was a 7.91 @ 91.8 w a 1.81 60 ft on Nitto DR's My technique on those was launch at about 3700 or so and feather the clutch and they hooked pretty good @ about 16 psi. With the M/T's I havae tried everything it seems pressure at 24, 18, 16, 13, and even 11. Then I have launched at 5k, 4k, 3k, dumped the clutch, and tried to feather it. The best I have got was a 1.90 60 ft! In about 11 passes. But I can't get them to hook? What is the correct teqnique to launch on these? What am I doing wrong!?

ty_ty13

iTrader: (42)

i put about 19-21.25 pounds in my MT Dr's but they are 275/60 15's and i cut 1.53's


what other suspension do you have?


these DR's hook best at about 19.5 pounds... just the nature of them...

bigdsz

iTrader: (1)

Check out this thread.

https://ls1tech.com/forums/drag-racing-tech/530254-m-t-drag-radials-what-pressure-you-running-track.html

I can't hook either. I've got 275x40x17's. I put out about 425 rwhp. Iloaned them to a friend of mine that puts out about 460 rwhp, and he couldn't hook. I think it's the track, but maybe I need to work on the suspension too.

tektrans

iTrader: (23)

They don't like to shocked too much, that's my experience on them.
I think they are great DR's but I think the best performing sizes would be going on a 15" rim. I wouldn't expect too much from a 17" DR unless the track and your suspension/power level is perfect.
I've run 1.41 on the 325 50 15's off the footbrake and they would not hook for me off the transbrake. I would think it would be even harder on a stick car.

boostedrs

iTrader: (2)

My suspension setup is
BMR Front/Rear Sway Bars
BMR Adjustable Torque Arm
BMR 1" Lowering Springs
KYB Adjustable Shocks
BMR Weld-in Rectangular Sub Fram Connectors
Metco Billet Relocated Low Control Arms

That is pretty much all of my suspension stuff. But still can't get it to hook.

Loadre

iTrader: (5)

M/T recommends these tires only for footbraked auto cars. Manuals or transbrakes need a bias ply.

bigdsz

iTrader: (1)

I did not realize that MT did not recommend their DR's for M6 cars, I'll have to check that out . I do however realize that 275X40X17's are a compromise and would like to run the 15's. I will get Weld or Centerline 15X10 when and if they come out, I catagorically refuse to pay $400 for Bogarts just on general principles. 17X11 ZR1's seem like a viable option, I can buy them chromed for $130 each. The only way I can get the MT DR's to halfway hook is at like 13PSI.

GTA91

iTrader: (14)

What? Are you serious??

Loadre

iTrader: (5)

Yup it was somewhere online and was also in Car Craft or GMHTP in the section where the Pros answer some Q&A.

GTA91

iTrader: (14)

Like I believe anything I read in magazines or everything I read online... from what I've seen, these tires just need a quick cleanup burnout... anymore than that and they tend to get slippery. I think that's the real problem.

bigdsz

iTrader: (1)

OK guys I just called Mickey Thompson, I got to tell you I am astounded, they categorically stated the the MT DR's should NOT be used on a manual transmission car. Kevin told me the shock load is too great for the tire since the side wall is stiff. The shock makes the tire spin out of control assuming your car has the hp to do so. I was told M6's need ET Streets or slicks, period. Now I understand why my friend and I haven't been able to get the DR's to hook.

ls1mongrel

iTrader: (32)

I cut low 1.6 with the 17" mt, sold them to a guy with a vette and he never could get them to work good, I dont think they like the shock of the clutch dumps, need more sidewall for that !

tektrans

iTrader: (23)

I had no idea. No wonder I couldn't hook off the transbrake.

GTA91

iTrader: (14)

I got my 325/50/15's last night and I'm mounting them on my 15x10 prostars today. Guess I'll find out how they work in a few weeks when my car is running again...

Loadre

iTrader: (5)

You can thank the LT1 guy for enlightening you.

dedge

If you go to Micky Thompsons web site they have the correct way to break their tires in, the correct air pressure to run at the track and also how to do your burnouts to get maximun traction.

GTA91

iTrader: (14)

I wonder how many stickshift and transbrake guys have been trying this on 15" MT DR's or the 325/50/15?

Ranger

Wow.

I'd suggest that the issue you guys are having is related to getting the MT Radials up to proper temp.

On my stock 02 Z06 I'd did about 50 passes on stock tires; 250 passes on BFG 315.35.17 Comp TA DRs, and the last 50 passes on MT Sreet Radials 275.40.17. And the MT Radials produced the best 60' consistently. Got about 50% 1.6X and 40% low 1.7X and 10% mid-1.7X. Best was 1.609.

But the MT Radials are very sensitive to proper psi and to a correct burnout.

I ran them usually at 20-22 psi.

First burnout of the day, a good smoky burnout.
Second and subsequent passes that day, spin them to just first wisps of smoke, which MT calls "hazing the tires." If you do a smoky burnout after the first pass, the Radials get greasy and the 60' suffers .15-.25.

My car had 363 rwhp. Launch rpm was 4600-5200 on a well prepped track and a few hundred lower on moderate prep.

Fast clutch release and a progressive throttle squeeze.

Several guys in our Corvette club are running these tires and all have similar 60' to mine on about the same rwhp. On same day same track four of us were cutting mid 1.6X. The fastest stock C5Z06 60' have all been on the MT Radials. The MT bias-ply don't come to the fore until the rwhp climbs to around 400 in Z06s.

Ranger

GTA91

iTrader: (14)

Ranger, I agree. The logic above just doesn't make sense to me b/c lots of stick guys have cut low 60's on nitto/bfg DR's. I definitely agree with you on tire pressure and burnouts. All the research I've done leans towards proper pressure/burnout. Guess I'll find out soon enough.

broken98

Have no exp w/mts on track but my friend runs them on street. Its a m6 (lca tourq arm car )w/ a 17inch rim leaving on n02 @3300 and they hook like a mo fo. He doesnt heat them up too long and he ussualy feathers clutch a bit. Plus those tires arent rated for many miles or passes so inmo i woudnt buy them used. Im sure a 15 inch is much better.