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Tracking / Autocross / HPDE / Drifting What these cars were built for!


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Old 08-07-2020, 06:38 PM   #15
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That's not what breaks axles. It's sudden shock load when the axle cannot take any more..
I hear you. That's what I'm worried about. Bumpy track at maximum compression while accelerating and a catastrophic failure

Hear the bumpiness: You can just hear the clunk I'm talking about at 0:26.






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Old 12-07-2020, 01:58 PM   #16
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Hi all. I have been doing HPDE and DD'ing my car for three years and have gone through two driver side axles in 40k miles. What is the upgrade option referenced in this thread? I don't need 1,000hp unobtanium super axles, but I could apparently use something stronger than OEM. I am on RCE springs, so it is not angle induced. I run 245 RS-4s on 17x9 Apex wheels. The heat shield looks like a smart mod, too...
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Old 12-07-2020, 03:05 PM   #17
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I hear you. That's what I'm worried about. Bumpy track at maximum compression while accelerating and a catastrophic failure

Hear the bumpiness: You can just hear the clunk I'm talking about at 0:26.
If you're hitting max compression then you probably need more bump or something to help mitigate max compression on those type of bumps.

This is what @CSG Mike is talking about, nothing worse than an completely unloaded wheel getting shocked on when coming back down onto pavement. Yes, it happens more than 1 time. And no, I still have OE axles. (carefully knocks on wood)

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Old 12-07-2020, 04:29 PM   #18
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Hi all. I have been doing HPDE and DD'ing my car for three years and have gone through two driver side axles in 40k miles. What is the upgrade option referenced in this thread? I don't need 1,000hp unobtanium super axles, but I could apparently use something stronger than OEM. I am on RCE springs, so it is not angle induced. I run 245 RS-4s on 17x9 Apex wheels. The heat shield looks like a smart mod, too...
DSS should permanently fix your problem, since you're not running slicks.

PM me to order and I'll get you squared away.
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Old 12-07-2020, 04:48 PM   #19
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Stiffer spring rates
Raised rear subframe (SPL subframe bushing kit)
Max out rear droop travel with tender springs
Cusco heat shield
OE axles re-packed with hi-temp grease (Redline CV for example), vented

This is the formula I've followed. Not only will your axles last longer, you'll be rewarded with a better handling car. It's what the factory TMG cars in Europe do for longevity of their axles on endurance race cars. I haven't replaced one yet, and started with 30K street units. Hoosier R7's exclusively.

Lots of ways to skin this cat though....
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Old 12-08-2020, 12:45 AM   #20
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DSS should permanently fix your problem, since you're not running slicks.

PM me to order and I'll get you squared away.
Aren't those axles like 1200 bucks? And good for 800 hp? My car is stock. An axle rated at 300 hp would still be double what my car makes.
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Old 12-08-2020, 08:32 AM   #21
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Aren't those axles like 1200 bucks? And good for 800 hp? My car is stock. An axle rated at 300 hp would still be double what my car makes.
Let me know when you find a 300 hp axle.
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Old 12-08-2020, 08:49 AM   #22
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Let me know when you find a 300 hp axle.
Honestly, the stock ones should be. Fairly easy and cheap to replace, but a little disappointing nonetheless given stock power level, ride height, and street tires.
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Old 12-08-2020, 10:25 AM   #23
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Honestly, the stock ones should be. Fairly easy and cheap to replace, but a little disappointing nonetheless given stock power level, ride height, and street tires.
Just like how the TOB can't handle anything either.

Cars have weak points, you live and learn.

My car has been lowered since 900 miles, now at 23k miles or something. It's had hard launches it's whole life from ProSolo and now sees the track with R7s. I have yet to go through an axle. Though even with that, I have 2 spares always ready to swap.
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Old 12-08-2020, 02:11 PM   #24
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Honestly, the stock ones should be. Fairly easy and cheap to replace, but a little disappointing nonetheless given stock power level, ride height, and street tires.
Axles are rated in torque, not hp.

When you drop a fat 2800lb car on a little axle, it's gonna break.
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Old 12-08-2020, 06:40 PM   #25
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Axles are rated in torque, not hp.

When you drop a fat 2800lb car on a little axle, it's gonna break.
My point is, as you know, simply that they are inadequate if they have trouble surviving stock power levels (in this very light car). But thanks for the correction on hp vs tq. I will drop a line to the guys that MAKE the axles and let them know to they are marketing them wrong
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Old 12-08-2020, 06:54 PM   #26
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My point is, as you know, simply that they are inadequate if they have trouble surviving stock power levels (in this very light car). But thanks for the correction on hp vs tq. I will drop a line to the guys that MAKE the axles and let them know to they are marketing them wrong
The car is not made to be track-ready out of the box. Folks who track the car are a tiny minority.

Even a GT3RS is not track ready out of the box.

This is why there is a 86 race car available for about $90k, and a GT3CUP available for approximately $250k. Those cars are truly track ready.
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Old 12-09-2020, 10:54 AM   #27
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I hear you. I run an oil cooler, race pads, and try not to abuse the clutch and trans too much. Your "track ready" comment is very general though. I am talking about axles. Do those other cars require aftermarket axles for an otherwise stock car on street tires to run HPDE without breaking? Is that a common thing? I believe the answers are "no" and "no". Anyway, I will just keep buying stock ones every 20k until I replace the car. Thanks.
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Old 12-09-2020, 11:40 AM   #28
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I hear you. I run an oil cooler, race pads, and try not to abuse the clutch and trans too much. Your "track ready" comment is very general though. I am talking about axles. Do those other cars require aftermarket axles for an otherwise stock car on street tires to run HPDE without breaking? Is that a common thing? I believe the answers are "no" and "no". Anyway, I will just keep buying stock ones every 20k until I replace the car. Thanks.
I honestly don't understand what point you're trying to stand on.

Cayman 2.7s have IMS bearings that explode basically. S54 Engines from the E46/E85/6 have VANOS Failure and spin bearings. I can literally go on and on.

EVERY car, let me say that again, EVERY CAR will have a weak point. Engineers design the car to satisfy the constraints that are given to them - IE not a car that is ran 10/10ths on the track, hell not even 3/10ths for that matter.
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