Axle boot tears
06-29-2014, 10:38 AM
#1
Axle boot tears
This past week I was at VIR. After my second hot lap doing HPDE both outer axel boots were spewing grease all over the place. I had a smoke screen behind my car and had poor braking which caused the car to be unstable and spin. This is the third time that I have been to the track and torn outer axel boots. I have used several different manufactures for replacement axels. The car is lowered only 1" and I run Nitto NT-01 track tires. I have no issue when driving on the street. I had the axles replaced after my last track event in March and they were fine with street driving. Is there something happening that is causing the boots to tear? Is it heat buildup in the brakes that is causing the grease to boil? That is the only plausible reason I have found. Has anyone else who tracks their car had this problem? Is there a different type of boot or axel I need to use? Is anyone using vented axel boots? I can't be the only person this has happened too.
Any help appreciated!!
This is what I read on the driveshaftshop website:
Road race upgrade(ask if available for your application)
Standard grease liquefies at 300 degrees Fahrenheit, the high temp gease has a much higher break down temp. We have a vented boot that keeps the boot from expanding. The benefits are keeping c.v. temps down, Which pro longs axle life and boot life. In road race settings axle failure 9 times out of 10 caused by high temperatures in the c.v’s.
This is from the sunspeed website
Any help appreciated!!
This is what I read on the driveshaftshop website:
Road race upgrade(ask if available for your application)
Standard grease liquefies at 300 degrees Fahrenheit, the high temp gease has a much higher break down temp. We have a vented boot that keeps the boot from expanding. The benefits are keeping c.v. temps down, Which pro longs axle life and boot life. In road race settings axle failure 9 times out of 10 caused by high temperatures in the c.v’s.
This is from the sunspeed website
¹ Optional Road Racing Upgrade
If you will be racing your car consider that the CV is bolted directly to the rear rotor. On extreme tracks it can get the internals of the CV to well over 300 Fº The problem, after 300 Fº most grease will vaporize and blow the boot up like a balloon causing it to rub on the suspension ripping the boot and ending the race. We have created a Road Racing upgrade that will eliminate this problem. First we polish and match all the internals so the CV is pre-broken in. We then use a high grade synthetic grease specially formulated for this applicatione.g. NEO. We have developed a higher durometer boot and vented them so if the higher temperature is achieved it will just let the gas out of the boot and not expand it. With all this in place the axles will hold up to the most demanding tracks. Please remember the axles without this package will handle most track days. This extreme Road Rage package is designed for an all out race car that will see continuous extreme track days.
06-29-2014, 03:49 PM
#3
I snapped a brand new eBay axle after 10 autox.launches when I got a.real.OEM axle to replace noticed it was much heavier and thicker, possible your car had the eBay ones?
06-29-2014, 05:40 PM
#5
The axels aren't breaking. Only the boots are tearing. The last two sets were from a local reputable rebuilder. He did not charge me for the replacements or the labor but it happened again.
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06-30-2014, 04:01 AM
#9
Originally Posted by 99SH
Is you builder using OEM boots?
