Polarporsche

I had an axle (blue) shear off this past weekend at the IRPCA PCA race at Miller on my 996 WC Cup Car.
I had blue axles on the car and replaced the one broken axle with a OEM black axle, that's all we could find at the track to get me up and running within 2 hours.

The black axle seem to fit properly and bolted right in but the tracking grove for the ABS pick up seems to be a little different design than the Blue Axle we removed from the car
The issues I had after replacing the blue axle with a black axle was the ABS braking was very erratic, it caused intermittent ice brake effect and made things very challenging during the race weekend.

I'm going to purchase a Blue axle to replace the broken one, ASAP. Does any know if it's ok to mix the different axle types or a no-no because of ABS issues.

amso3

I'm wondering if the broken axle damaged the sensor on that upright. We swap out blue and black axles (in pairs though) on 996 cups all the time. If there was a difference in the axle notches, it would cause issues front to rear, which we have not seen. If you have data the monitors all 4 wheel speeds, I'd check that defore and after the broken axle

boothkc

They should be replaced in pairs. They are also to be used in the same direction for their life so if you keep the unbroken one it should be used on the same side only...something to do with metal and how they get stressed in one rotational direction only.

Blue and blacks should interchange. From memory the Blues are about $6800 per pair and the blacks (street axels) are only about $1500.

No idea how much weaker the black ones are in a race application.

Kevin

Ricky Boo-Boo Johnson

We had the same thing happen, but we opted not to swap black for blue - the threading seemed to be quite different.

Polarporsche

Thanks to all for your input, I have found a set of used Blue Axles from a fellow Rennlister and will replace both axles with the matched used set. I plan on keeping the good Blue axle that's on my car as a spare back-up, the Black axle will be go back into storage.

I have asked my shop (Tatum Racing) to look at the ABS sensor to ensure it wasn't damaged when the axles split. The axle shaft actually split in two just inside the outer boot, luckily it didn't damage the suspension or under carriage.

amso3

Holy mackerel, I just noticed the Tatum Racing sign in the Avatar (and your post). Say hi to JT, Patsy and Shawn for me

Polarporsche

Will do, JT, Pasty and Shawn are really nice folks. I truly enjoy the friendly & family atmosphere around their shop.

Leigh2

Russ let's do lunch and discuss the rental rate on my spare black axle

Polarporsche

Lunch on Friday at Bothy's for sure.

We didn't end up using your turbo axle, it didn't have the ABS pick-up track on it so we ended up getting a used axle from Potter's Shop.

Hopefully the rental rate is not to high for unwrapping and rewrapping your axle, it's still new & shiny and on the shelf.

Skypalace

The stock grease in the blacks will quickly liquify when run at race temp, you'll soon have black streaks all over your wheels, and the axles won't last. At a bare minimum you'll want to repack with Krytox or Neo.

See old thread https://rennlist.com/forums/porsche-...bad-pic-3.html

smsarchitects

+1
that liquifying just happened to me this last weekend with the normal grease used in the turbo axles.....only on loaded side though which I guess makes sense.
repacking all with Neo.

Speaking of that, are the axles swappable side to side?

tedean

I wish I had known. I had a blue spare axle and would have loaned it to you!

Rickard 993 Turbo

where to buy neo or krytoc

Julian Allen

Hoerr Racing has both:

http://www.hrpworld.com/index.cfm?tp...action=product

http://www.hrpworld.com/index.cfm?tp...action=product

I got my Krytox from http://www.rmiorder.com/category/Z-L...ase-ptfe-lox-8

You can even get Krytox on Amazon now!

Skypalace

Be careful with krytox, nasty stuff, wear gloves at all times, you don't want it on your skin.

I personally wouldn't swap axles side to side, and I mark my spares for side. Note also that Porsche wants you to bed in new axles by running them at partial load.