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 Post subject: pirelli P7 tires
PostPosted: April 21, 2019, 12:28 am 
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Joined: October 19, 2009, 9:36 pm
Posts: 2137
Location: meadview arizona
my tires wore out on the rear, probably due to tuning the computer under boost,

size is 105/55/16.

the tires i took off were pirelli P6's that i inflate to 28 psi cold.

can't get P6's anymore so i fitted P7's, now the car wanders all over the road.

i haven't changed anything else my rear camber is 1 deg negative on both sides and i have 1/8" tow in, i have checked this today, i also checked the front which is 1 degree negative camber, caster is 4.5 degrees and 1/16" tow in, all as before, the temps are within 2 degrees across the tread after a longish drive.

the car seems to float around and change lanes with different camber changes in the road surface, also because i am so close to them, i can here them and they sound just like they are running flat or near to flat, like a rumble but they are not.

any help would be apreciated.

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 Post subject: Re: pirelli P7 tires
PostPosted: April 21, 2019, 9:14 am 
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Joined: March 19, 2011, 10:22 am
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Location: Holden, Alberta, Canada
Hi John
Just a shot in the dark here - are they by any chance directional tires? I have had directional tires mounted wrong and they act kinda squirrely.

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 Post subject: Re: pirelli P7 tires
PostPosted: April 21, 2019, 10:53 am 
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Joined: October 19, 2009, 9:36 pm
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Location: meadview arizona
Hi JD,

not directional but have a note on them saying "outside".

i still have the old tires so i might put them back on just to see if it is the tires or ?

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 Post subject: Re: pirelli P7 tires
PostPosted: April 21, 2019, 12:06 pm 
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Location: Massachusetts
It's probably the tires. That's too bad. My first guess on the noise is it might come down to the shape and positioning of the blocks in the tread. I had a set of tires on a Mustang that did that and after a while you could see the blocks didn't wear evenly either. Then you could see what was going on.

I think the desire of the tire to follow the road camber is called "trammeling". Some tires do this more than others, but I don't remember exactly why. Consider dropping your pressure a few pounds, at least to see what changes...

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 Post subject: Re: pirelli P7 tires
PostPosted: April 22, 2019, 7:51 am 
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john hennessy wrote:
Hi JD,
Oooh, you're gonna hear about that one!!! :mrgreen:

Sincerely,
"Perry"

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 Post subject: Re: pirelli P7 tires
PostPosted: April 28, 2019, 9:08 pm 
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sorry JD and Perry,

sorry about that, there are times when my mind is out of wack

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 Post subject: Re: pirelli P7 tires
PostPosted: April 29, 2019, 7:18 am 
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Joined: March 19, 2011, 10:22 am
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Location: Holden, Alberta, Canada
john hennessy wrote:
sorry about that, there are times when my mind is out of wack

Ha ha ha, no problem at all John, now we know you're just as normal as the rest of us.

For a moment, just a moment, being mistaken for the CEO of Team Slotus felt pretty good. That was til I pictured myself bent over the 7 working on it and Bubba was behind me ...............

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'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O.
Perry's S10 Super 7 The 3rd
Perry's 4th Build, The Topolino 500 (Little Mouse) Altered


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 Post subject: Re: pirelli P7 tires
PostPosted: April 30, 2019, 7:52 am 
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horchoha wrote:
For a moment, just a moment, being mistaken for the CEO of Team Slotus felt pretty good. That was til I pictured myself bent over the 7 working on it and Bubba was behind me ...............
If you're working, Bubba won't be anywhere around. Now, if you were bent over the grill, putting pork chops on a plate, keep an eye out for him. You could lose a finger... Don't get your hands anywhere near his mouth when he's eatin'... :rofl:

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