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Unread 09-01-2011   #1 (permalink)
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Default Mickey Thompson tech: "ET Street Radials won't work on stick cars"

As some may have read in an earlier post, I've been looking around for a set of track-only wheels and tires for my '11 GT. I had decided on the ET Street Radials but stumbled across a set of the ET Streets on ebay for cheap so I checked them out on the MT website. They list a "suggested tube" on the site and preferring to not have to mess with tubes I e-mailed MT to see if tubes were required for those tires (after finding mixed results online, 50/50 split). The tech emailed back that they are a tube-type tire and listed the reasons a tube should be used, that wasn't the interesting part though. I replied thanking him for the info and that I would end up getting the ET Street Radials b/c I didn't want to mess around with tubes. His reply was that if my car was an auto the ET Radial would be a fine choice but that they wouldn't work if my car was stick . . . stating that due to how much harder stick cars hit the tires compared to autos, combined with the ET Street Radial being a stiffer tire, I would just spin (he said they had done extensive testing). The MT website makes no mention of the Radials only being suited for auto cars and LRS uses them in their Race Star package (also without any trans. distinction). I know that manual cars hit the tires harder than autos and the Radials probably are a harder compound and stiffer sidewall than the Streets, but to the degree that they won't work on my car?

So I'm asking for input from anyone running either the ET Street Radials or Radial IIs (same compound) on manual transmission 2011 GT's.

Do they work? What do you launch at with them? etc.

Also to anybody running the Streets, do you run tubes?

Thanks all.
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'11 GT MT w/ 3.73s and some bolt-ons

600 RWHP / 460 RWTQ - Measured <--> 627 RWHP / 485 RWTQ - DA Corrected
11.94 @ 123, 1.84 60 ft. - Actual <--> 11.85 @ 124 - DA Corrected
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Unread 09-01-2011   #2 (permalink)
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Don't waste your time with those.

Much better to run MT Drag Radials for simplicity and great performance.

Mickey Thompson 3754R Mickey Thompson ET Street Radial Drag Tires
 
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Unread 09-01-2011   #3 (permalink)
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I never ran tubes when I had ET streets and never had a problem.

I can understand about the ET drag radials but lots of manual trans cars run them regardless.

And if you want tires with more sidewall flex then run 15" wheels/tires so your tires will have a taller sidewall.
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Unread 09-01-2011   #4 (permalink)
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I'm running M&H Cheater Bias Ply tires with tubes in a 26 x 11.5
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Unread 09-01-2011   #5 (permalink)
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I have a set of MT 3743 ET Street 26x11.5-17LT on RaceStar 17x9.5 and those are a tubeless tire plus I am running a manual transmission…
I have only blasted down the track a couple of times and I hit them harder each time off the line… I am starting to get some spin (launching at 3000RPMs) not a lot but I can feel a little, hardly any spin going to second and none that I can feel or hear hitting third… They did not improve my 60’ times like I thought they would but this is my first set so I am going to have to learn how to get the best launch out of them… I think I need to drop my RPMs down and slip the clutch a little more to keep my RPMs up at launch…
I have 15 pounds in them I think I need to drop down a few more pounds and try it again… According to Mickey Thompson 12 pounds is the minimum you should run on ET Street 26 inch tall tires with the cars weight of over 3500 pounds.
I am with you, looking thru the catalog I seen nothing on the ET Street Radial II being for an automatic transmission but one section of the catalog does say that the tire compound best for a clutch would be M7 and the radials tire is a R2…

http://mickeythompsontires.com/catalogs/
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Unread 09-01-2011   #6 (permalink)
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I am a Mickey Thompson guy through and through, but I kind of disagree with both statements.

1. you DON'T need tubes with the ET Streets. (or ET Drags for that matter) Been there done that. The tires actually lay a more even patch without the tubes pushing them out in the middle.

2. Yes, stick cars work better with bias ply tires which will absorb the shock of a clutch drop by wrapping around the rim... but stick cars can also work on radials. It just takes a very specific technique. Raise the revs and ride it out with a nice clutch slip to keep the tires from spinning on the hit, because once you spin a radial, they don't really want to recover. (so the pass is blown)

One of our employees at UPR has a 2011 GT with our control arms and SCT tune, and he's running 11.90s with a manual trans on drag radials.
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Unread 09-01-2011   #7 (permalink)
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I'm running ET street radial IIs (265/40-18) on a bone stock 2011 GT MT. I was running 16# in them and launching at 4000 RPM. I cut a 1.83 60' and a 12.72 @108 the first time out in 90 deg heat. They worked for me!
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Unread 09-02-2011   #8 (permalink)
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Those are the exact ones I plan to run.

Quote:
Originally Posted by Ltngdrvr View Post
And if you want tires with more sidewall flex then run 15" wheels/tires so your tires will have a taller sidewall.
That's what I'm hoping for by running a 275-60-15 (like Grimace427 posted the link to above).

Quote:
Originally Posted by JohnRichard View Post
They did not improve my 60’ times like I thought they would but this is my first set so I am going to have to learn how to get the best launch out of them… I think I need to drop my RPMs down and slip the clutch a little more to keep my RPMs up at launch…
Quote:
Originally Posted by Sharad View Post
It just takes a very specific technique. Raise the revs and ride it out with a nice clutch slip to keep the tires from spinning on the hit
Sounds like slipping the clutch is the most effective method with the Radials on a stick car. I was hoping to avoid that but I guess I'd rather slip the clutch than mess around with the Streets/tubes/etc. I can tinker around with them when I get them, maybe I can find a suspension setting/launch rpm combo that allows me to do a traditional drop-clutch launch, we'll see I guess.

Thanks for the input all.
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'11 GT MT w/ 3.73s and some bolt-ons

600 RWHP / 460 RWTQ - Measured <--> 627 RWHP / 485 RWTQ - DA Corrected
11.94 @ 123, 1.84 60 ft. - Actual <--> 11.85 @ 124 - DA Corrected
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Unread 09-02-2011   #9 (permalink)
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Quote:
Originally Posted by HercDriver View Post
I'm running ET street radial IIs (265/40-18) on a bone stock 2011 GT MT. I was running 16# in them and launching at 4000 RPM. I cut a 1.83 60' and a 12.72 @108 the first time out in 90 deg heat. They worked for me!
Nice times, especially on that hot of a day. Thanks for the info. Do you get any wheelspin when you launch? at the 1-2 shift?

Off topic question, but what gear ratio is your car, 3.31s, 3.55s, 3.73s? I ask b/c I've got the 3.73s and running a 27" street tire at the strip I run out of 4th gear right before the traps (have to shift or hit the rev limiter right at the line), and seeing that you run a shorter tire yet it seems like you'd have the same issue that I do. But I guess there are a lot of factors that play into it, I was just curious seeing your times.
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'11 GT MT w/ 3.73s and some bolt-ons

600 RWHP / 460 RWTQ - Measured <--> 627 RWHP / 485 RWTQ - DA Corrected
11.94 @ 123, 1.84 60 ft. - Actual <--> 11.85 @ 124 - DA Corrected
Wannabe Sleeper
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Unread 09-02-2011   #10 (permalink)
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My last time out at the strip I bolted on my Racestars with these exact MT tires. I first burnout was epic and no one that came with me got a decent shot!

Anyway, it was about 93 degrees with almost 3,000' DA so times sucked. I did run a 1.82 60' on to a 12.59 @113mph. All mods listed in sig.

On every pass I got great traction but I wasn't lauching it like a pro. Maybe about 3k rpms +-500 due to the heat and not wanting to break anything as I was driving the car home. On one pass I got tire shake through 1st gear but I stayed in the throttle and drove through it. The track was bumpy as all hell so I could not tell if the vibration I was feeling was from the tires or the surface.

Either way now that temps are coming down here I will hit the track again sometime this month and will not leave without and 11 second slip.

Mickey Thompson tech: "ET Street Radials won't work on stick cars"-263320_254084341287977_100000592400478_983686_7548663_n.jpg

Mickey Thompson tech: "ET Street Radials won't work on stick cars"-284585_254084327954645_100000592400478_983685_4788128_n.jpg
 
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Unread 09-02-2011   #11 (permalink)
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I run 305/35-20's ET Street II's never had a problem what so ever....daily driven.....only thing I cant vouch for is driving in the rain other than that I LOVE MY STICKY TIRES
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Unread 09-02-2011   #12 (permalink)
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Quote:
Originally Posted by Grimace427 View Post
Anyway, it was about 93 degrees with almost 3,000' DA so times sucked. I did run a 1.82 60' on to a 12.59 @113mph. All mods listed in sig.

On every pass I got great traction but I wasn't lauching it like a pro. Maybe about 3k rpms +-500 due to the heat and not wanting to break anything as I was driving the car home. On one pass I got tire shake through 1st gear but I stayed in the throttle and drove through it. The track was bumpy as all hell so I could not tell if the vibration I was feeling was from the tires or the surface.
Those still seem like decent times, especially considering the DA. It's good to hear that they provide good traction off the line as long as you don't launch at too high of a rpm. I'll be trailering the car to the strip but would still prefer not to break anything, so I'll gladly keep the launch rpm low and take a little engine bog and good off-the-line traction in place of a hard launch that may jeopardize traction and drivetrain parts. Thanks for the info.
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'11 GT MT w/ 3.73s and some bolt-ons

600 RWHP / 460 RWTQ - Measured <--> 627 RWHP / 485 RWTQ - DA Corrected
11.94 @ 123, 1.84 60 ft. - Actual <--> 11.85 @ 124 - DA Corrected
Wannabe Sleeper
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