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11-10-2016
Hey guys I've read through the forums and there was a thread that said to get size 660 for a 3.5 setup with no ic on a grand prix. So i did and the belt is way to long. Longer then stock so I need to know what belt to use with a 3.4/3.5 setup on a 99 grand prix with no ic. Thank you!
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11-10-2016
You used to be able to run the stock belt if you compensate with installing a larger idler pulley.
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11-10-2016
Ya I'd rather just get the right belt lol
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11-10-2016
i ran the stock belt on the 3.4 for years, it works just fine.
11-10-2016
I'm pretty sure it's slipping occasionly I'm getting belt squeal and on some runs I'll be getting 8.5-9 lbs of boost and then on other 7.5lb
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11-10-2016
i made 12 in the winter 10 in summer on a 3.4 and stock belt, yours is not slipping unless your belt is shot.
if you really want a shorter belt, drive to a parts store and ask if you can test fit a few belts, figure out what stock is, try one a 1/2 inch shorter, most stores will let you do this. ive yet to find one that wont. most of the time they ask you leave your drivers lic for collateral. how i got my belt for the 3.0 and 3.2 pulleys.
11-10-2016
That's probably what I'll have to do should be to hard just to find a belt ever so slightly smaller then stock. Why do you see so much of a psi difference from weather is it the density of the colder air. I knew it fluctuated but I never thought there would be that much of a difference
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11-10-2016
cold air is denser. so more psi.
tell the parts guy what your doing, he can figure out how long your belt is, and then give you a shorter one. all them numbers on the belt add up to it size.
11-10-2016
Ok thanks Scotty. Also off topic do you know if I can wire my new wideband up to replace the stock narrowband o2?
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11-10-2016
no, you need the upstream o2, add a bung install the wb in it.
11-10-2016
O ok. I watched this video on YouTube and the guy wired it up to replace the narrowband but it was on a miata and his o2 only had one wire. It would have been awesome if you could do that haha. Also my original plan was to just wire it up to my aftermarket head unit just because it's so easy but on the instructions it says not to for some reason. So what would be the best place?
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11-10-2016
people put in the vent, the cubby, or a dash pod or a A pillar pod.
11-10-2016
No I mean where should i splice in for power to the gauge?
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11-10-2016
the fuse box is my first choice lol
get a add a fuse, put it in the wiper fuse and now you got key on power.
11-10-2016
Here is ZZP's belt size chart with gates belt part numbers.
Applications:
667 - Gen 5 blower stock belt GTP/GS/SS supercharged with stock 3.8" pulley (67 1/4" -1708mm)
663 - Gen 3 blower stock belt GTP/GS/SS supercharged with stock 3.8" pulley (66 7/8")
660 - GTP/GS/SS supercharged with 3.3 - 3.7" pulley (66 3/4")
658 - GTP/GS/SS supercharged with 3.2 - 3.6" pulley (66 3/8" - 1687mm)
653 - GTP/GS/SS supercharged with 3.1 - 3.5" pulley (65 7/8")
650 - GTP/GS/SS supercharged with 2.8 - 3.1" pulley (65 1/2")
645 - GTP/GS/SS supercharged with 2.6 - 2.8" pulley
716 - Bonneville SSEi, Park Ave, or Riviera with a 3.4" pulley
721 - Bonneville SSEi, Park Ave, or Riviera with stock supercharger pulley (72 5/8" 1845mm)
(Riviera/Bonneville/Park Ave use same length belts)
Stage 2 or 3 Intercooler
685 - 3.3"+
680 - 2.90" - 3.20"
675 - 2.6" - 2.8"
Short Stack intercooler
675 - 3.5" pulley
672 - 3.3"-3.4" pulley
670 - 3.2" pulley
667 - 3.0" pulley
Accessory belts
915 - Stock accessory belt for Series II '99-03 (works with either UD WP pulley or OD alt pulley but not both) (2340mm)
919 - 99-03 Accessory belt with WP UD pulley 92 3/8"
923 - Accessory belt for Series II '99-03 with UD WP pulley and alt UD pulley (2360mm)
905 - Stock accessory belt for 04+ Grand Prix/ 04+ Monte Carlo/ Impala
935 - Stock accessory belt for 97/98 -or- 04+ Monte with Alt relocation kit (94" - 2367mm)
938 - Accessory belt for 97/98 with both underdrive pulleys (2400mm)
SS M90 supercharger kit for L36
970 - SS M90 for 97/98
955 - SS M90 for 99+ 4.0"- 4.2" pulley
950 - SS M90 for 99+ 3.8"- 4.0" pulley
947 - SS M90 for 99+ 3.5"-3.8" pulley
Meziere electric water pump
875 - 99-03 accessory belt with Meziere electric water pump
864 - 04+ accessory belt with Meziere electric water pump
895 - 97/98 with Meziere electric water pump
Originally Posted by W-Body Store
11-10-2016
Ya see that's the list I went off of before and I got the 660 belt for my 3.5. 660 is actually bigger then stock by a lot too.
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11-10-2016
Where'd you get your stock belt? How long is it?
Don't take this the wrong way, but you've got it routed correctly?
Originally Posted by W-Body Store
11-10-2016
Haha ya I got it routed correctly. The stock belt was got from advance auto as the stock belt part #. It is stock belt length.
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11-11-2016
There's a unused plug that's already routed to the fuse box on its own fuse in our cars it's behind the glove box. You can buy zzp's drop down harness to plug right into it or just cut the plug off the one on your car and splice into it. There's 3 wires a ground, constant power, and an accessory wire which is where I hooked my aeroforce to so the gauge shuts off when you turn the car off.
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11-11-2016
looking at the above list of what belt size to use with the specific pulley, a 660 is smaller than stock, as it should be. the stock length for a gen 3 car is a 663, if you look, you will see. This is the list I have been using:
http://www.grandprixforums.net/threa...elt-size-chart
One thing I have noticed is that if a belt wrap kit is used, a longer belt also needs to be used, but so far I haven't seen any information on what belt size to use with the specific pulley and a belt wrap kit.
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