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Question for you higher horsepower FI guy - DRs, cold, and tire shake?

Old 01-14-2007, 11:59 AM
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Default Question for you higher horsepower FI guy - DRs, cold, and tire shake?

Not entirely sure what was going on last night so I figured I would post up and see if anybody else has had this happen.

Last night here in phx it was below freezing and I was driving my turbo camaro home. Well after testing a few things I was running about 14 psi on good gas and it makes about ~740 rwhp at that boost level. When I wacked it on the freeway at about 75 mph with the 315 BFG DRs it started to break loose and started to "shake" pretty badly, almost like the DRs started to skip on the ground. It literally felt like the rear was going to come out from underneath me. I got home, checked underneath to make sure everything was tight and went out again to test it and it did it again! On 10 psi it didn't have any issues. Has anybody experienced this before? Is it related somehow to just being too cold outside with the DRs, concrete freeways, and too much power for traction? Pretty weird and it's never done this before, just spun.
Old 01-14-2007, 01:50 PM
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I've had that happen with Nitto DRs. When it gets real cold they become VERY hard and dont hook and can shake.
Old 01-14-2007, 02:54 PM
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Stop "testing" in cold weather.

Andrew
Old 01-14-2007, 04:07 PM
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do you have stroker motor? I had probs with crank leaking oil out of gun drilled hole on around seal leaking on clutch.
Old 01-14-2007, 05:33 PM
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That was God warning you. Cold Nittos = no traction.
Old 01-15-2007, 07:46 PM
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well what was it?
Old 01-15-2007, 08:52 PM
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I dunno if it's just cold... but weeks ago when the temp was around freezin early one morning, I rolled into mine in second gear and pedaled and put it back down to get the nittos warmed up. I was seeing almost 16psi in the cold air and rolled into it in third and had that same 'shake' feeling... grabbing hard and jumping. I thought my car was gonna **** the ten bolt on the interstate so I got right out. I repeated this to a T a few days later again in the freezing air. It's definitely not a normal thing or my 12 bolt would already be under the car.
Old 01-15-2007, 08:57 PM
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I had BFG's on my Cobra and Cold + DR's + IRS = Oh, S@#$!!! Lesson of the day...Dont test on cold pavement!
Old 01-15-2007, 09:42 PM
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thats wheel hop at high speed...
Old 01-15-2007, 09:53 PM
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Originally Posted by otherwhitemeat
thats wheel hop at high speed...

Yup, I don't have a boosted car but I used to have some VERY worn out Nitto's, on a really cold day I could nail it in 3rd and have the *** end start to break loose and it would do the same thing your describing...it's HELL on the drivetrain!
Old 01-15-2007, 11:01 PM
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That's kind of what I figured guys, DRs + freezing weather = tire shake/wheel hop with decent power. It hardly ever gets this cold in phoenix which explains why it's never happened before. I checked everything underneath the rear and there was nothing loose and everything was still good from when I originally set it up.
Old 01-15-2007, 11:09 PM
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Originally Posted by Pro Stock John
That was God warning you. Cold Nittos = no traction.
Old 01-15-2007, 11:56 PM
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Originally Posted by Pro Stock John
That was God warning you. Cold Nittos = no traction.
I can deal with the no traction, that's nothing new. It's the wheel hop at 75 mph that got to me.
Old 01-15-2007, 11:57 PM
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It FEELS worse than hop though, you can really feel it twisting...
Old 01-16-2007, 01:00 AM
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i had that trying to EASE into 4th gear........ first and last time i did that!! scary feeling.... it was on my way home and i skated across a few lanes
Old 01-16-2007, 09:48 AM
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Originally Posted by Frost
It FEELS worse than hop though, you can really feel it twisting...
That's why I was worried. Tire spin at 75 mph is no problem, the rear end feeling like it's trying to make an exit from underneath your car at 75 is a problem.
Old 01-16-2007, 01:05 PM
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You are just plain....well do not try stuff in cold weather as that seems to break a lot of things. Just ask Halfshaft Steve.

Chad


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