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> Neep some help, front tire chatter how do I fix it??, Second day on track tomorrow
FASTFATBOY
post Dec 1 2013, 12:20 AM
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First time on r comps.

The front end is chattering in the corner, get on the gas and it fixes it cant carry any entry speed because of it.

Tires are BFG R1's, pressures to start are 30F 26 R, end of session 34F 33R.

I took the rear spring rubbers out and lowered the rear. The ass end was all over the place, this helped a bunch and dropped 3 seconds off the lap time.

Go up or down on pressure or what?

You enter the corner, the car starts to push and the tires chatter, skip, gas pedal pedal helps it.

All input welcome.

My new best is 2:02 at NOLA.
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FASTFATBOY
post Dec 4 2013, 08:54 PM
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I took my spring rubbers out of the rear, it dropped the rear an inch(at least). Made the rear have MUCH more grip.

My axle snubbers have been trimmed about an inch, I can push the car down in the rear with my hands about 1.5 inches and you can feel them hit.

How much "free travel" should the rear have sitting still should they have? How far should I be able to push the rear down with my hands before they touch?

This post has been edited by FASTFATBOY: Dec 4 2013, 10:51 PM
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Blainefab
post Dec 10 2013, 02:46 AM
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QUOTE (FASTFATBOY @ Dec 4 2013, 12:54 PM) *
I can push the car down in the rear with my hands about 1.5 inches


If you can do this with shocks installed then the shocks are shot.

With no shocks you can bounce the back of the car pretty good - hitting the bumps stops I think would be easy, but not a good metric for ride or bump stop height.
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FASTFATBOY
post Dec 10 2013, 02:55 AM
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QUOTE (Blainefab @ Dec 10 2013, 02:46 AM) *
QUOTE (FASTFATBOY @ Dec 4 2013, 12:54 PM) *
I can push the car down in the rear with my hands about 1.5 inches


If you can do this with shocks installed then the shocks are shot.

With no shocks you can bounce the back of the car pretty good - hitting the bumps stops I think would be easy, but not a good metric for ride or bump stop height.



What about zero rake in the car?

I drove it again today with the rear raised even with the front, still good rear grip just not as good as it was (it seems).

No longer touching the bump stops on the street.
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Posts in this topic
FASTFATBOY   Neep some help, front tire chatter how do I fix it??   Dec 1 2013, 12:20 AM
nape   Less front roll stiffness > Soften the front sw...   Dec 1 2013, 05:21 AM
Blainefab   Try backing off the front sb end link nuts a coupl...   Dec 1 2013, 06:25 AM
Steve91T   I don't think that's enough front tire pre...   Dec 1 2013, 06:27 AM
Blainefab   With Toyo/Hoosier/Yokohama, starting cold pressure...   Dec 1 2013, 08:37 AM
Interceptor   QUOTE (Blainefab @ Dec 1 2013, 01:37 AM) ...   Dec 1 2013, 03:37 PM
ReEntryRacer   QUOTE (Interceptor @ Dec 1 2013, 07:37 AM...   Dec 1 2013, 09:17 PM
FASTFATBOY   VID http://www.youtube.com/watch?v=YaCRdy4mBVw......   Dec 1 2013, 11:22 AM
FASTFATBOY   Listen at 4:44 and 8:56 https://www.youtube.com/w...   Dec 2 2013, 03:56 AM
trackbird   QUOTE (FASTFATBOY @ Dec 1 2013, 10:56 PM)...   Dec 2 2013, 01:27 PM
robz71lm7   How are your caster bushings??? I've had weir...   Dec 2 2013, 07:33 PM
PeteL   Loose upper control arm bolts were the cause of my...   Dec 2 2013, 09:59 PM
FASTFATBOY   All of my front bushings are fine. Would the 35/1...   Dec 3 2013, 04:02 PM
FASTFATBOY   Tire pics. They were rotated at the end of day 1. ...   Dec 3 2013, 04:04 PM
trackbird   QUOTE (FASTFATBOY @ Dec 3 2013, 11:04 AM)...   Dec 3 2013, 04:48 PM
Steve91T   You're on Strano springs, right? Seems like yo...   Dec 3 2013, 05:05 PM
FASTFATBOY   QUOTE (Steve91T @ Dec 3 2013, 05:05 PM) Y...   Dec 3 2013, 05:24 PM
Steve91T   QUOTE (FASTFATBOY @ Dec 3 2013, 12:24 PM)...   Dec 3 2013, 06:13 PM
FASTFATBOY   QUOTE (Steve91T @ Dec 3 2013, 06:13 PM) Q...   Dec 3 2013, 09:50 PM
camarokid91   My car does this in Autocross on low speed tight c...   Dec 4 2013, 06:38 PM
trackbird   QUOTE (camarokid91 @ Dec 4 2013, 01:38 PM...   Dec 4 2013, 08:46 PM
FASTFATBOY   QUOTE (trackbird @ Dec 4 2013, 08:46 PM) ...   Dec 4 2013, 08:50 PM
FASTFATBOY   I took my spring rubbers out of the rear, it dropp...   Dec 4 2013, 08:54 PM
ReEntryRacer   QUOTE (FASTFATBOY @ Dec 4 2013, 12:54 PM)...   Dec 4 2013, 09:54 PM
Blainefab   QUOTE (FASTFATBOY @ Dec 4 2013, 12:54 PM)...   Dec 10 2013, 02:46 AM
FASTFATBOY   QUOTE (Blainefab @ Dec 10 2013, 02:46 AM)...   Dec 10 2013, 02:55 AM
mr.beachcomber   QUOTE (FASTFATBOY @ Dec 10 2013, 02:55 AM...   Dec 10 2013, 01:24 PM
FASTFATBOY   QUOTE (mr.beachcomber @ Dec 10 2013, 01:2...   Dec 10 2013, 01:47 PM
FASTFATBOY   QUOTE (Blainefab @ Dec 10 2013, 02:46 AM)...   Dec 10 2013, 01:50 PM
FASTFATBOY   I put the Detroit TrueTrac in the car, trimmed the...   Dec 8 2013, 11:48 PM

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