 Project 3.6 RS Thread, Live and learn.. Tires rubbing at Autocross |
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| mskala |
 Nov 9 2026, 08:49 AM
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#161
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R  Group: Members Posts: 1,968 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None 
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When I was autocrossing my -6 with ~150HP (narrow body), it worked well
with 20mm front torsion bar (Elephant was only one making these) and 180lb rear springs, no rear sway bar, very soft front sway bar. I used 205/45 on 7.5x16 wheels. As was said, you will need an adjustable brake bias. If using autocross tires like RE71, the sidewalls are very stiff, and you will need to keep pressure much lower than you have, probably below 25psi. Any 914 should be able to be set up to handle trail braking fine. But with the low weight of these cars, either the front needs to either stay a bit soft or you will need to initially apply the brakes more gently to get the weight transfer. And, with high HP, be gentle on the gas on the way out of the turn. Also, for the lug nuts, I was always under the impression that you should have as much thread engagement as stud diameter; that would mean 14mm / (1.5mm/thread) = 9.3 turns of engagement for safety. I suspect you would get flagged at tech sometime if you have a lot less than that. |
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| mepstein |
Nov 9 2026, 09:20 AM
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#162
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914-6 GT in waiting Group: Members Posts: 20,989 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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open lug nuts makes everything easier
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| brant |
Nov 9 2026, 11:11 AM
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#163
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914 Wizard Group: Members Posts: 12,290 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(mskala @ Nov 9 2026, 07:49 AM)  When I was autocrossing my -6 with ~150HP (narrow body), it worked well with 20mm front torsion bar (Elephant was only one making these) and 180lb rear springs, no rear sway bar, very soft front sway bar. I used 205/45 on 7.5x16 wheels. As was said, you will need an adjustable brake bias. If using autocross tires like RE71, the sidewalls are very stiff, and you will need to keep pressure much lower than you have, probably below 25psi. Any 914 should be able to be set up to handle trail braking fine. But with the low weight of these cars, either the front needs to either stay a bit soft or you will need to initially apply the brakes more gently to get the weight transfer. And, with high HP, be gentle on the gas on the way out of the turn. Also, for the lug nuts, I was always under the impression that you should have as much thread engagement as stud diameter; that would mean 14mm / (1.5mm/thread) = 9.3 turns of engagement for safety. I suspect you would get flagged at tech sometime if you have a lot less than that. (IMG:style_emoticons/default/agree.gif) |
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