Superman05

I bought an Obx Underdrive crank pulley and A set of Obx Water pump and alternator Overdrive pulleys....Would anyone happen to know of the belt size needed after the install? Thanks

game-over

i thought the stock belts fit.
i don't think that the pulleys get smaller.. they just are lighter
i could be wrong. so someone please correct me just incase

ack154

iTrader: (7)

If you have an underdrive crank pulley, you would need a different belt. Personally I would contact OBX and see what they recommend. If they're selling the parts and not giving the recommended part info, that's just stupid.

If you want to go by the NST set, they list a couple different belts on their site (based on model year). I'd go by that if you can't get anything out of OBX.

http://www.nonstoptuning.com/pKitToySciTC.htm

Superman05

Obx list the belt size for the crank pulley alone or the overdrive pulley set but not the set as a whole. I have emailed them and currently awaiting response. I just thought maybe someone might have known so I would be able to compare answers to what obx says. Thanks

bridfi

do the math dude... seriously.

how does each individual pulley affect the belt length?

we are going to take the length differences of each and subtract them from the original belt length.

some variables that will help you: (i think this might only be true for 05-06 models)

OEM belt: 76.3"

Supercharged w/TRD pulley: 91.5"
Supercharged w/NST 9.5: 89.6"

No A/C: 63.6"

looked up on ebay:

underdrive crank pulley 74.7" 05-06, 73.9" 07-08

couldnt find belt sizes for your alternator/water pump kit, maybe the differences cancel each other out? is one bigger than stock and one smaller?

Superman05

Haven't received them yet, will update when i receive for more detailed info. Thanx

yellowxhoodie

iTrader: (16)

take string.
wrap around all pulleys in correct order.
measure string.
go to autzone.
buy belt.

Superman05

Thanks Yellowxhoodie, exact answer I needed...would it be better to get a size smaller then what I measure? or exact?

RoboCop

iTrader: (1)

I would say make sure when you wrap the string around the pulleys to pull tight and to pull as tight when measuring.The correct size would be best to not cause extra stress. I could be wrong though. I don't do much pulley work.

yellowxhoodie

iTrader: (16)

exact size, and make sure you dont use string that stretches.
i had to do this for my wire tuck.
the belt im running now actually has 2 less ribs than stock, but it was the only one on the right length.

Superman05

Is this safe?

yellowxhoodie

iTrader: (16)

has been for like 10K miles

rangerryda

iTrader: (1)

Non-supercharged applications tend to not give much issue with variances in length calculating errors. Two less ribs won't kill ya if you aren't F/I. Might slip and reduce belt life if you are F/I.