C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

U.D. pulleys

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Old Mar 5, 2010 | 06:02 PM
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Default U.D. pulleys

I have all my stuff apart and I am adding my parts to my Summit Cart.

Does anyone run the non amp series, with an auto trans.

I don't do much city driving, and I will have low gears, so I am thinking I can get away with the more dramatic set.
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Old Mar 5, 2010 | 07:30 PM
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I installed the March 3 piece set. Don't run headlights much at all, but never have had any problems when I did run several accessories at the same time. I'd say go for it.
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Old Mar 5, 2010 | 10:22 PM
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Originally Posted by l98tpi
I installed the March 3 piece set. Don't run headlights much at all, but never have had any problems when I did run several accessories at the same time. I'd say go for it.
So you don't have the amp series which helps with charging?

I am wondering if they are less effective than the plain set.
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Old Mar 5, 2010 | 10:33 PM
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Originally Posted by pologreen1
So you don't have the amp series which helps with charging?

I am wondering if they are less effective than the plain set.
I think the amp series just puts a smaller pulley on the alternator so it spins faster right?
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Old Mar 5, 2010 | 10:36 PM
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Originally Posted by Pwnage1337
I think the amp series just puts a smaller pulley on the alternator so it spins faster right?
Yeah but I ma not sure how much that cancels out the crank. This thing does not rev up quick at all compared to other cars I have had, and it needs all the help it can get.
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Old Mar 5, 2010 | 10:44 PM
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I have the March Power & Amp series on my '88 but only run the under crank & over alt pullies.

Have you tossed the "frisbee" from your WP pulley yet and maybe bump stock timing to 8 deg BTDC??
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Old Mar 6, 2010 | 01:15 AM
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Originally Posted by 65Z01
I have the March Power & Amp series on my '88 but only run the under crank & over alt pullies.

Have you tossed the "frisbee" from your WP pulley yet and maybe bump stock timing to 8 deg BTDC??
Frisbee is gone now, and I will mess with timing after it is running again, but it has the hypercrap chip in it, so I can't mess with it too much I don't think. Before I sold the SR, I was going to get a tuned chip, but....
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Old Mar 6, 2010 | 06:21 AM
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I have a 1990 Vert auto with the 3 pc. billet aluminum March U/D pullies. To run proper you must have the smaller alternator pulley on for proper charging. Tried it both ways and it is a must for the smaller one supplied. I needed a 90-1/2" belt also. I am currently running 3:54 gears also...replaced the 2:73's. I have no problems with this set up.
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Old Mar 6, 2010 | 08:20 PM
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Originally Posted by UNCLEBILL
I have a 1990 Vert auto with the 3 pc. billet aluminum March U/D pullies. To run proper you must have the smaller alternator pulley on for proper charging. Tried it both ways and it is a must for the smaller one supplied. I needed a 90-1/2" belt also. I am currently running 3:54 gears also...replaced the 2:73's. I have no problems with this set up.
Perfect info thanks
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