Check those U-joints!
Thread Starter
Melting Slicks
Joined: Mar 2016
Posts: 2,778
Likes: 580
From: Langley BC
I should also note that in our C4's the halfshaft u-joints have to support the stress of acceleration, as well as cornering forces. And I suspect turning and accerating is going to create the most stress. And more power, stickier tires and better suspension are proabbably all cumulatively adding to the stress on those u-joints. That's sorta the limitation of the C4 rear architeture I'm referring to, versus a double wishbone design with CV axles really only has to support acceration forces.
Thread Starter
Melting Slicks
Joined: Mar 2016
Posts: 2,778
Likes: 580
From: Langley BC
The problem in my case howeverr is the halfshaft u-joints that were failing/ wearing out fast. because the halfshafts also act as the uppper suspension link they need to transmit rotational force (acceleration/deceleration) but also have to withstand compressional and stretching forces from cornering which likely makes CF unsuitable as I believe its only strong in one direction based on how its weaved.
Instructor
Joined: Nov 2012
Posts: 216
Likes: 54
From: central indiana
i was referring to the main driveshaft. essentially cushioning the power fed to the rear dif.
ive read a lot about cf axles. however i have not seen anyone with a c4 post about using them with a failure. all i can remember up to this point is speculation.
ive read a lot about cf axles. however i have not seen anyone with a c4 post about using them with a failure. all i can remember up to this point is speculation.
Race Director
Joined: Sep 2001
Posts: 14,679
Likes: 752
From: NEwhere Ohio
I feel like the stock driveshaft might work well, even on 1000 hp builds with the zf6
simply bc the zf6 doesnt have crazy high gear rations. Like 2.66:1 is nothing crazy
that said, i did put better quality u joints in it (cant remember if 1350 upgrade, but i at least did 1310 cold forged without grease fittings)
now, i did upgrade the rear halfshaft to chromealoy and cold forged u joints also
so im about to find out if the stock driveshaft can take the power on holeshots on 315 MT ET street R drag radials
which it will need to do to send Tesla plaid packing for home on my forged 383 , f1-a94 + 100 shot nitrous build that i am finishing up
simply bc the zf6 doesnt have crazy high gear rations. Like 2.66:1 is nothing crazy
that said, i did put better quality u joints in it (cant remember if 1350 upgrade, but i at least did 1310 cold forged without grease fittings)
now, i did upgrade the rear halfshaft to chromealoy and cold forged u joints also
so im about to find out if the stock driveshaft can take the power on holeshots on 315 MT ET street R drag radials
which it will need to do to send Tesla plaid packing for home on my forged 383 , f1-a94 + 100 shot nitrous build that i am finishing up
Thread Starter
Melting Slicks
Joined: Mar 2016
Posts: 2,778
Likes: 580
From: Langley BC
I feel like the stock driveshaft might work well, even on 1000 hp builds with the zf6
simply bc the zf6 doesnt have crazy high gear rations. Like 2.66:1 is nothing crazy
that said, i did put better quality u joints in it (cant remember if 1350 upgrade, but i at least did 1310 cold forged without grease fittings)
now, i did upgrade the rear halfshaft to chromealoy and cold forged u joints also
so im about to find out if the stock driveshaft can take the power on holeshots on 315 MT ET street R drag radials
which it will need to do to send Tesla plaid packing for home on my forged 383 , f1-a94 + 100 shot nitrous build that i am finishing up
simply bc the zf6 doesnt have crazy high gear rations. Like 2.66:1 is nothing crazy
that said, i did put better quality u joints in it (cant remember if 1350 upgrade, but i at least did 1310 cold forged without grease fittings)
now, i did upgrade the rear halfshaft to chromealoy and cold forged u joints also
so im about to find out if the stock driveshaft can take the power on holeshots on 315 MT ET street R drag radials
which it will need to do to send Tesla plaid packing for home on my forged 383 , f1-a94 + 100 shot nitrous build that i am finishing up
The gear ratio in my magum trans is 2.97 1st gear and I have 3.54 rear gears.
