Thread: Is my belt slipping

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  1. #1 Is my belt slipping 
    Donating Users bandook's Avatar
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    picture host ru

    There is some residue on the side of the overflow tank. And the MAP and calculated boost fluctuate a little on a wot pull, while my MAF steady climbs. Just looking for confirmation before I buy a belt from someone who's experienced this before. I'm running a 3 inch pulley and current belt is
    653 - GTP/GS/SS supercharged with 3.1 - 3.5" pulley (65 7/8")

    Should I drop to a 65 1/2"? That's the next size down but it's only 1/4" difference.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  2. #2 Re: Is my belt slipping 
    Donating Users bandook's Avatar
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    Sorry, formating got me again. Current belt is 65 7/8 from zzp.

    Is there a good replacement I can get from advanced Auto or somewhere local? I've been searching for awhile but haven't found it yet.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  3. #3 Re: Is my belt slipping 
    Killa Bee Scottydoggs's Avatar
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    those dots of some type of fluid are from a coolant or axle leaking grease, belt catches it and slings it. could even have a stripe under the hood.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: Is my belt slipping 
    Donating Users bandook's Avatar
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    Only thing leaking is oil pan. Slow leak. I put a smaller belt on it anyways.

    Looking at one of your scans what does the MAP do at 100% throttle? I really haven't paid much attention to it because I had a 1 bar sensor on. I put the 2 bar just to see boost. I hit 14psi. But it kinda fluctuates up and down even though rpms are steadily increasing. Maybe it's normal, dunno.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  5. #5 Re: Is my belt slipping 
    Killa Bee Scottydoggs's Avatar
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    you need to change a map setting or two when you swap the map out. best to get a sc file for your car and compare it with your tune.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: Is my belt slipping 
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    Sloppy Mechanics Wiki - GM Map Sensor Identification - scale - offset - settings

    Yup. I've been using sloppy's values for awhile. Even if the values were off a bit it shouldn't matter when it comes to fluctuating values at wot. It's probably just the nature of the m90. Also may be because I'm near the limit of a 2 bar map. I'd like to see someone else's scan, hint hint. It's all in fun, for education.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  7. #7 Re: Is my belt slipping 
    GTP Level Member wowitsfast's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    those dots of some type of fluid are from a coolant or axle leaking grease, belt catches it and slings it. could even have a stripe under the hood.
    Like This? lol


    Sent from my SM-N920V using Tapatalk
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  8. #8 Re: Is my belt slipping 
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    Nice chit stains! I pulled the hood insulation/whatever off a few weeks ago. No farts stains here. 😆
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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