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Old 03-26-2013, 01:54 PM   #1
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New MT radial PSI suggestions

Just got these today. Mickey Thompson ET Street Radial II - 295/45-17 on AM Bullit wheels. The MT website says to run them at 12 PSI and up. They came loaded at nearly 40 so I put them down to 20 to test them out. Its in the 30s here but with some cold test launches they gripped really well.

They are for track use only and I'm running 6MT and 3.31 ratio. Any suggestions for drag race PSI? Thanks!

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Old 03-26-2013, 02:02 PM   #2
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Just got these today. Mickey Thompson ET Street Radial II - 295/45-17 on AM Bullit wheels. The MT website says to run them at 12 PSI and up. They came loaded at nearly 40 so I put them down to 20 to test them out. Its in the 30s here but with some cold test launches they gripped really well.

They are for track use only and I'm running the 3.31 ratio. Any suggestions for race PSI? Thanks!
Wow looks awesome man!! I been looking on Craigslist for a pair to strap on some rear tires..
For road course I lower the psi to 27 cold and it goes up to 35 when hot and run it at that.
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Old 03-26-2013, 02:08 PM   #3
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Wow looks awesome man!! I been looking on Craigslist for a pair to strap on some rear tires..
For road course I lower the psi to 27 cold and it goes up to 35 when hot and run it at that.
Thanks! I don't plan on running road course anytime soon although I bet it is fun.
I'm concerned about getting the most traction at the drag strip.
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Old 03-26-2013, 02:40 PM   #4
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I know my tires are bigger, 285-35-19, but MT recommends 35 for mine. I got a response from AM saying the same. Maybe if you are really unsure reach out and see what they say.

I cannot in anyway see 20 as being correct PSI!

Also, they are not like true drag tires where you can mess with the PSI and get good traction. Radial tires need to be at their correct PSI so the tire sits flat too the ground. Too high a PSI and the outsides pull up and the contact patch is low. Reverse that and too low a PSI and the inside of the tire doesn't make contact but just the outer edges.

either way you will also wear your tires out faster.
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Old 03-26-2013, 02:44 PM   #5
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I know my tires are bigger, 285-35-19, but MT recommends 35 for mine. I got a response from AM saying the same. Maybe if you are really unsure reach out and see what they say.

I cannot in anyway see 20 as being correct PSI!
Yeah I just put them at 20 because I wasn't sure if the website was correct. These are Street/Drag radials though. If I remember correctly drag radials always run pretty low psi.

Any update on your new MT street comps? Mine should be here next week!
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Old 03-26-2013, 02:47 PM   #6
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Yeah I just put them at 20 because I wasn't sure if the website was correct. These are Street/Drag radials though. If I remember correctly drag radials always run pretty low psi.

Any update on your new MT street comps? Mine should be here next week!
Ohh I think I misread your post haha my bad, thought you meant the street comps .

Yes somewhat, only gotten to drive them in 38 degree weather, but daaaaaamn they stick in this cold weather, cannot wait until the heat of summer.
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Old 03-26-2013, 03:35 PM   #7
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I run M/T tires at 13 psi at the track and find that to be the best place for them, just FYI.

Again, that is 13 PSI at the track on the street I roll a simple 32 PSI.
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Old 03-26-2013, 03:41 PM   #8
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I run M/T tires at 13 psi at the track and find that to be the best place for them, just FYI.
Thanks! Do you have the ET Streets or IIs?
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Old 03-26-2013, 03:45 PM   #9
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I have ran both and the drag radial as well. 13PSI just seems to be the sweet spot for some reason.
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Old 03-26-2013, 03:47 PM   #10
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I'll try 13. Thanks.
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Old 03-26-2013, 03:49 PM   #11
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Again that is 13 PSI at the track.. You will need more PSI to run on the street to make sure a tire doesnt separate from your rims.
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Old 03-26-2013, 04:38 PM   #12
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This is for the track only. I recommend starting at 18psi and going down from there til you get the launch your looking for. Your sweet spot will probably be between 12-16psi. The tires will perform different everywhere in the country due to altitude, temp and track prep.
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Old 03-26-2013, 04:45 PM   #13
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This is for the track only. I recommend starting at 18psi and going down from there til you get the launch your looking for. Your sweet spot will probably be between 12-16psi. The tires will perform different everywhere in the country due to altitude, temp and track prep.
Good info thanks!
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Old 03-26-2013, 10:55 PM   #14
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I run M/T tires at 13 psi at the track and find that to be the best place for them, just FYI.

Again, that is 13 PSI at the track on the street I roll a simple 32 PSI.
Same as above 14-18 track 32 street on 305/35/18 ET streets
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Old 03-27-2013, 11:43 AM   #15
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Didnt think about it but I do run at the same track when I go I bet that has alot to do with why 13 PSI consistantly seems to be the sweet spot for me with M/T tires.
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