LS1Queen

iTrader: (1)

I run the radials and with very little burnout's and 22psi i have went 1.322 60ft and can pretty much cut 1.30's at will I have tried low air pressure and big burn outs they just wouldnt hook

gearheads78

iTrader: (29)

Well I tried it at 18 and seemed to work OK. 1.67 60 in a full weight car. I was pretty happy. I think with a little work I can get it down in at least the low 1.6 range.

Dbluegoat

19-20 here.....I actually forgot to take air out once and they were at 30psi and I clipped off a 1.58 60'

less than 19 seems to be worse

skinnies

iTrader: (33)

That does remind me, I did a 1.70-1.90's when my buddy put 28lbs of air in them and I didn't check them because my guage was in my other car. Only change was dropping them do 18lbs and it went immediately to high 1.5's.

ChevPower

iTrader: (8)

This is how we found out the radials like the air, we bought are first set of 325's and where running 15psi and through out the tires lifes the car was cutting 1.40's never dead hooking, on the 2nd set my wife the queen stoped at goodyear on the way to the track to have them put on i forgot to let the air out the car cut its first 1.30 60ft the i realized that i didnt bag them so i took the air pressure from 30psi to 15psi the car spun like hell so did the pass after that so i started thinking how did it just hook on 30psi so to the pumps we go i put 20psi and tried that it went 1.36 60ft dead hooked after 3 more 1.30 60ft i adjusted them back to 15psi 60ft went to 1.45

gator's 99TA

iTrader: (2)

there ya go. what chevpower said.

also the taller the tire the more psi can be used and still hook IMO. a 17" m/t will require slightly less, but not significanly less.

bigdsz

iTrader: (1)

Guys, I'm sure we've all heard the terms "contact patch" an "wrinkle wall". There is a reason for them, it's obvious that the more you air down a tire the larger the contact patch will get. Likewise when you floor the gas, the side wall of the tire wrinkles, so the contact patch gets even larger. Less air to a point is better. I think the MT spec is a 12 lb minimum. For sure dragsters and funny cars air down their their tires WAY down. I'm certain they would more than likely want to go 300+ mph with a fully inflated tire, but they can't because of traction.

gator's 99TA

iTrader: (2)

bigdsz - you certainly know how to throw around terms but there is one thing you are missing. a very important issue.

its where a tire is designed to operate at. a dragster with a 33" goodyear slick will operate its best at 7.5 psi for SC dragsters. would you run a 17" nitto dr at 7.5psi?

how you are "explaining" contact patch leads me to believe that i should run 7.5 psi in nittos b/c the contact patch will grow. right?

its all about the design of the tire. the radial tire does not operate at its optimum at low psi. i mean, not to be mean but your slow/lazy 60' times show this right?

bigdsz

iTrader: (1)

Below are the tire pressure guidelines off the MT website. I would think if MT thought you would get maximum traction at 22-25 psi for instance, then they would have said that.



Proper use of Mickey Thompson ET Street Radial

Inflation Pressures


On the racetrack DO NOT use starting pressures below 11 psi.
Recommend pressures for:

P295 and larger sizes: 11-14 psi
P275 and smaller sizes: 12-16 psi



On the highway we recommend running 75% of the max psi as notes on the sidewall of the tire.

Burnouts


The tread compound used in the ET Street Radials is designed to heat quickly and does not require a heavy burnout. Continue the burnout until the engine starts to pull down. We do not recommend a dry hop after the burnout.

Bead/Wheel Slippage


Some bead/wheel slippage may result during the course of a 1/4 mile (or 1/8 mile) drag race. This is normal.

Bead-Lock Wheels


For drag strip speeds in excess of 180 mph, Bead-lock wheels are highly recommended.

gator's 99TA

iTrader: (2)

nice cut and paste. what are your real world experiences leaning on this tire? like myself and others have said in this thread, you arent even leaning on this tire untill you are sub 1.5 60' times

redline2k

iTrader: (9)

I don't think the problem is his suspension. I have seen vettes with totally stock suspension cut 1.5x 60's on bfg drag radials. So this stays on topic when I ran drag radials on my car my best 60' were with 20lbs of air in the tires.

daniel6718

iTrader: (36)

should make this thread a poll

10-12
12-14
14-16
16-18
18-20

or something like that

Brett H

iTrader: (2)

I have some problems with these statements. First your "contact patch" will actually decrease with lower air pressures on a MT street radial because the tire will begin to "cup" causing only the outside edges to make contact with the ground due to its stiffer sidewall which leads me to the "wrinkle wall". MT street radials are just that "street tires" and are nothing like a drag slick that is designed to have a soft side wall to produce wrinkles. Although I have seen the MT's wrinkle personally it is nothing like what a slick or W tire will do.
So to reiterate what I have already stated, from personal experience I have found that 20-22 psi min with a small burmout works best and yeilds me consistent 1.6 60' on a bolt on car.

ChevPower

iTrader: (8)

[QUOTE=Brett H]I have some problems with these statements. First your "contact patch" will actually decrease with lower air pressures on a MT street radial because the tire will begin to "cup" causing only the outside edges to make contact with the ground due to its stiffer sidewall which leads me to the "wrinkle wall".


This is true a RADIALS needs air pressure to support the side walls if not the side wall will give pushing the center of the tire in causing less contact.

gator's 99TA

iTrader: (2)

ugg forget it guys. this cat is happy telling us whats up with his no hookin 6 speed on radials. just give up and be happy with your bumper draggin 22 psi radial tires.

greg/paula/chevypower/lsqueen - just think how much of the rear bumper cover you could rip off if you REALLY hooked (sarcasim).

and here is a pic. if you dont do this on a small 28" radial, then shut the fug up.

http://www.drivelinestudios.com/nbna...tionalsweb.jpg