 Roll couple and rear tire spin |
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| yeahmag |
 Feb 22 2018, 11:49 AM
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#21
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Advanced Member  Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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I do think an LSD would help this car, just way, way, WAY out of the budget right now. I'd like to tune the inner wheel spin out with suspension as best I can (for now).
I'd love to dyno it, it's a healthy 2056 for sure... |
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| pcar916 |
Feb 23 2018, 06:01 AM
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#22
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Is that a Lola? Group: Members Posts: 1,523 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None
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My car is where I like it on a road course, and got far better when I installed an LSD. But for AX it was immediate and terminal understeer because the LSD breakaway is set far too tight for that. That said my machine is stiffer than yours on both ends of the car and has roughly 225hp at the wheels. If I was to build a box for AX with a non-open diff, it would likely be a torque-bias diff instead.
I'm liking Chris' solution and tweak with tire pressures when you get it close. Good Luck |
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| yeahmag |
Feb 23 2018, 11:45 AM
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#23
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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I'm constantly tweaking tire pressures, but we settled on roughly 21lbs HOT front and rear worked best on the day of testing. I'm sure newer DOT-Rs would be have a bit different.
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| pcar916 |
Feb 23 2018, 05:45 PM
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#24
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Is that a Lola? Group: Members Posts: 1,523 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None
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QUOTE(yeahmag @ Feb 23 2018, 11:45 AM)  I'm constantly tweaking tire pressures, but we settled on roughly 21lbs HOT front and rear worked best on the day of testing. I'm sure newer DOT-Rs would be have a bit different. Oops, I meant Chris' mechanical solution then tire pressure tweaks. |
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| yeahmag |
Feb 23 2018, 05:52 PM
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#25
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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I may have a line on a 22mm sway bar (Gerold) and another member has offered to sell me some 22mm torsion bars. Money and time are the biggest obstacles to testing that setup now.
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| stownsen914 |
Feb 25 2018, 09:52 AM
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#26
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Senior Member Group: Members Posts: 912 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
So I'll throw this out there ... years ago when I was driving a stock-ish 914 on the track with an approx. 130 hp modified engine, I was getting terrible inner rear wheel shuddering due to lack of traction. The problem disappeared when I switched from regular performance tires to R compound tires. I see you're using Hankooks, which I understand are decent performance tires (it sounds like yours may be on the used up side, for what it's worth), but it may be worth exploring different tires in case the other suggestions don't do eliminate the problem for you.
Scott |
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| sixnotfour |
Feb 25 2018, 04:01 PM
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#27
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914 Wizard Group: Members Posts: 10,411 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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| sixnotfour |
Feb 25 2018, 04:02 PM
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#28
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914 Wizard Group: Members Posts: 10,411 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains
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flat 8
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