Underdrive pulley question
#1
04-25-2013, 11:41 AM
Join Date: Jan 2013
Location: East Coast
Posts: 294
Rep Power: 23 
Underdrive pulley question
I just purchased a new set of BBI pullies from Vivid Racing:
http://www.vividracing.com/catalog/2...-p-112437.html
I did my research and see that BBIs had an issue with cracking due to their light weight and material they were built from.
Can anybody confirm or deny that the pullies i bought are the updated ones that should be stronger or if they are the same type of pulley that people are having issues with.
http://www.vividracing.com/catalog/2...-p-112437.html
I did my research and see that BBIs had an issue with cracking due to their light weight and material they were built from.
Can anybody confirm or deny that the pullies i bought are the updated ones that should be stronger or if they are the same type of pulley that people are having issues with.
#2
04-29-2013, 01:33 PM
Registered User
Join Date: Jun 2008
Location: SFBA (was S. Florida)
Posts: 666
Rep Power: 57 
I have no first hand experience with BBI UDP... but have seen a number of pictures from other owners with cracked, broken, fractured UDP. I think consensus is that pursuit of a lightweight design (lots of holes/spaces) was the cause - there just isn't enough metal to keep the thing from fracturing and eventually breaking into pieces.
The picture/link you have looks like the ones I've seen on the web with the issue. Then again, I don't know if BBI re-designed them and Vivid didn't update the picture or if BBI re-manufactured them with different metal, but same design, etc. Best to confirm with Vivid or call BBI if they're now shipping newer/stronger UDP to all their vendors.
The picture/link you have looks like the ones I've seen on the web with the issue. Then again, I don't know if BBI re-designed them and Vivid didn't update the picture or if BBI re-manufactured them with different metal, but same design, etc. Best to confirm with Vivid or call BBI if they're now shipping newer/stronger UDP to all their vendors.
#3
04-29-2013, 01:46 PM
Join Date: Jan 2013
Location: East Coast
Posts: 294
Rep Power: 23 I have no first hand experience with BBI UDP... but have seen a number of pictures from other owners with cracked, broken, fractured UDP. I think consensus is that pursuit of a lightweight design (lots of holes/spaces) was the cause - there just isn't enough metal to keep the thing from fracturing and eventually breaking into pieces.
The picture/link you have looks like the ones I've seen on the web with the issue. Then again, I don't know if BBI re-designed them and Vivid didn't update the picture or if BBI re-manufactured them with different metal, but same design, etc. Best to confirm with Vivid or call BBI if they're now shipping newer/stronger UDP to all their vendors.
The picture/link you have looks like the ones I've seen on the web with the issue. Then again, I don't know if BBI re-designed them and Vivid didn't update the picture or if BBI re-manufactured them with different metal, but same design, etc. Best to confirm with Vivid or call BBI if they're now shipping newer/stronger UDP to all their vendors.
#4
04-30-2013, 02:43 AM
I have one of the first of their UDP's put on over 4 years ago. It doesn't look like the picture, a lot more metal on mine. You might want to go with a slightly smaller belt cause you'll be on the edge of what the belt tensioner can compensate for, especially since your belt is probably fairly old (Gates K060825). Mine would make a little noise in the morning when I would start it up or sometimes after using the A/C. You'll need a new bolt and washer if they didn't come with the pulley. Those are a one use set. Also, need to trim off the TDC pulley tab on the case so that the smaller one will fit. It can get a little messy so cover the end of the crank.
Don't expect to feel a difference in power. I did it more for helping keep the power steering a little cooler.
GL
Don't expect to feel a difference in power. I did it more for helping keep the power steering a little cooler.
GL
#6
05-07-2013, 06:30 PM
Join Date: Jan 2013
Location: East Coast
Posts: 294
Rep Power: 23 I have one of the first of their UDP's put on over 4 years ago. It doesn't look like the picture, a lot more metal on mine. You might want to go with a slightly smaller belt cause you'll be on the edge of what the belt tensioner can compensate for, especially since your belt is probably fairly old (Gates K060825). Mine would make a little noise in the morning when I would start it up or sometimes after using the A/C. You'll need a new bolt and washer if they didn't come with the pulley. Those are a one use set. Also, need to trim off the TDC pulley tab on the case so that the smaller one will fit. It can get a little messy so cover the end of the crank.
Don't expect to feel a difference in power. I did it more for helping keep the power steering a little cooler.
Yea I know not to expect a lot of power. Ill put it on the dyno, and then retune the car to see what happens.
GL
Don't expect to feel a difference in power. I did it more for helping keep the power steering a little cooler.
Yea I know not to expect a lot of power. Ill put it on the dyno, and then retune the car to see what happens.
GL
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