3074S M/T, a confusing and frustrating happening

[Woodfin]

Racers,

I need some help and experience about a tire change. For a number of years, I have raced with and recommended to others the M/T 3074S [32x14 stiff sidewall] This tire has given excellent performance and many rounds won with dead-on consistent runs.

The usage of this tire continued with my Super 10 and again, dead-on consistent, round after round.

Now the issue;

Two weeks ago I replaced the Super 10 tires simply because of them being two years old even though they were still performing excellently.

With the first run, Texas Motorplex, they chattered and slipped. This did not upset me even though it has never happened before with this tire or this truck. I thought, "OK new tire, needs a run or two to settled down"

I was wrong, even though I managed to win several rounds the chatter/slip never improved. The 60 foot was all over the map [exerating but coming from dead-on 60-foot numbers to moving around .02 - .03] We have a problem.

Yesterday, the second outing on the new tires was a repeat of the week before. slip/chatter and 60 foot moving .02 -.03 [again at Texas Motorplex] and again, managed to win some rounds in spite of inconsistent performance.

And remember, this is happening with a truck that prints time slips with the tire I just took off [same tire, same number, same size, same compound]

The starting line looks good, it has some rubber build up but is smooth and sticky. While watching other cars run most are dead hooking.

I am frustrated and open to suggestions.

[Woodfin]

I forgot to mention, we experimented with different pressures from a high of 12 to a low of 9 but the chatter/slip did not change.

With the tires I removed, 11 was the sweet number.

[MR DERBY CITY]

H o o s i e r..........

[james schaechter]

Did you contact Buddy at MT or the person that you bought the tires from?

M

Originally Posted by Woodfin

Racers,

I need some help and experience about a tire change. For a number of years, I have raced with and recommended to others the M/T 3074S [32x14 stiff sidewall] This tire has given excellent performance and many rounds won with dead-on consistent runs.

The usage of this tire continued with my Super 10 and again, dead-on consistent, round after round.

Now the issue;

Two weeks ago I replaced the Super 10 tires simply because of them being two years old even though they were still performing excellently.

With the first run, Texas Motorplex, they chattered and slipped. This did not upset me even though it has never happened before with this tire or this truck. I thought, "OK new tire, needs a run or two to settled down"

I was wrong, even though I managed to win several rounds the chatter/slip never improved. The 60 foot was all over the map [exerating but coming from dead-on 60-foot numbers to moving around .02 - .03] We have a problem.

Yesterday, the second outing on the new tires was a repeat of the week before. slip/chatter and 60 foot moving .02 -.03 [again at Texas Motorplex] and again, managed to win some rounds in spite of inconsistent performance.

And remember, this is happening with a truck that prints time slips with the tire I just took off [same tire, same number, same size, same compound]

The starting line looks good, it has some rubber build up but is smooth and sticky. While watching other cars run most are dead hooking.

I am frustrated and open to suggestions.

[Mark Markow]

I run that tire on my s-10 between 13.5 and 14 psi . at your weight I think 15psi would work. we run that tire at a pressure just slightly lower than the radial. you may just be wadding it up to much.

[Woodfin]

Thanks to all

Mark, I will keep going up with pressure and test that.

[kansas stocker]

Do they have the same circumference?
Pete

[supergas4]

where did you buy them.

[Woodfin]

Racers, I bring this topic back for an update.

To review, I installed, simply for maintenance, a new set of M/T #3074S [32 x 14 x 15S] The old set, although performing well, was two plus years old with many runs.

These are on my S-10, Super 10 super stocker that I also bracket race. It runs 6.30 - 6.40 in the cooler months, 6.40 - 6.50 in our Texas heat.

The stiff side wall has worked as expected for me with several other packages. Also, with my Truck, it has a 5.57 rear gear, 1.98 low and 6600 converter so it hits hard at the trans brake release, even with the small 327 engine.

So, again to review, the first outing with new tires produced chatter and slip. [same tire, same part number, same air pressure] I even talked with M/T to verify the tire was the same design, no changes.

After two frustrating outings of chasing the cause, and chasing the dial, and chasing the reaction times, at the recommendation of another race who runs the same tire and similar weight and performance, I made a drastic [for me] change. I am not prone to make large changes, I am usually slow and methodical with changing.

AnyWho, even though the truck had worked well at 11 pounds with old tires, and even though the general feedback was "hitting the tire too hard, needs more air" [we had it as high as 13 pounds]

Well, just go figger, dropped air pressure to 8 pounds and voila, dead hook with the expect ET.

It would be reasonable for a person to expect, at my age and with my experience, such lessons would have already been learned, yet, that expectation is wrong. It is my observation that the lessons are an on-going and never ending process.

[Mike Rietow]

Originally Posted by Woodfin

Racers, I bring this topic back for an update.

To review, I installed, simply for maintenance, a new set of M/T #3074S [32 x 14 x 15S] The old set, although performing well, was two plus years old with many runs.

These are on my S-10, Super 10 super stocker that I also bracket race. It runs 6.30 - 6.40 in the cooler months, 6.40 - 6.50 in our Texas heat.

The stiff side wall has worked as expected for me with several other packages. Also, with my Truck, it has a 5.57 rear gear, 1.98 low and 6600 converter so it hits hard at the trans brake release, even with the small 327 engine.

So, again to review, the first outing with new tires produced chatter and slip. [same tire, same part number, same air pressure] I even talked with M/T to verify the tire was the same design, no changes.

After two frustrating outings of chasing the cause, and chasing the dial, and chasing the reaction times, at the recommendation of another race who runs the same tire and similar weight and performance, I made a drastic [for me] change. I am not prone to make large changes, I am usually slow and methodical with changing.

AnyWho, even though the truck had worked well at 11 pounds with old tires, and even though the general feedback was "hitting the tire too hard, needs more air" [we had it as high as 13 pounds]

Well, just go figger, dropped air pressure to 8 pounds and voila, dead hook with the expect ET.

It would be reasonable for a person to expect, at my age and with my experience, such lessons would have already been learned, yet, that expectation is wrong. It is my observation that the lessons are an on-going and never ending process.

It might not be the new tires.