3.4 Pulley will this increase the times I go into boost? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-03-2003, 01:48 PM   #1
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Default 3.4 Pulley will this increase the times I go into boost?

I was thinking up changing my pulley to the 3.4 pulley. There are some steep hills I drive though everyday for about 35 miles. I put a total of 200 miles a day on the car. When driving over the hills now I hit boost a couple times. To avoid this I usually down shift to 3rd which keeps me out of boost. If I change to the 3.4 pulley will I go into boost more often? I would think I would but I figured I would ask.

Also, I do want the car to last as you can see I will be putting a lot of miles on it. Will changing to the 3.4 pulley shorten the life of the motor if I get on it every once in while?
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Old 02-03-2003, 01:53 PM   #2
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The pulley will get you into boost quicker and at a lower RPM than normal. Faster and better boost response. The car will still determine when to boost based on a number of factors.

The pulley won't hurt your car. It just spins the supercharger a bit faster. With proper SC maintenance, this really isn't an issue for concern. Cars have been doing this for years, even the 3800.

You should at least change your intake before you consider a smaller SC pulley. You need to make more air available, and since the SC will be making a bit more heat, the 180 thermostat is also strongly advised. Even ventilating your SC cover or simply removing it is good too. Just taking precautions.
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Old 02-03-2003, 02:22 PM   #3
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Does it prematurely wear the motor to go up a hill if I see about 1 to 2 pounds of boost in overdrive? Or is always better to down shift to 3rd and stay out of boost?
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Old 02-03-2003, 02:34 PM   #4
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Stay in OD, and get in the boost. It keeps the RPM'* down. This is what your car should excel at. If it wants to downshift, it'll do it when it'* ready. With your low, flat torque, it shouldn't be a problem at all. I leave mine in OD on all the mountain passes around here. Holds cruise on the steepest of them.
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Old 02-04-2003, 11:56 PM   #5
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Hey Will,
Haven't you installed your 3.4" pulley yet?
Once you do you will kick yourself for waiting so long.
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Old 02-04-2003, 11:58 PM   #6
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Oops, I meant the smaller pulley. I know you have a different supercharger.
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Old 02-04-2003, 11:59 PM   #7
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You mean my 2.25" pulley. Sounds scary, but stock on a 93 M62 is 2.55".

It'* SUPPOSED to be on the way. We'll see. I'm getting ready to pull the SC and replace the nosedrive coupler in the next week or two. I'm hoping the pulley will be here by then. I have a new tensioner pulley to try, also.
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Old 02-05-2003, 01:39 AM   #8
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Let me know how that tensioner pulley works.

I was able to keep my stock length supercharger belt, just switched to a gatorback design for better traction.

The stock pulley close to the end of its travel. I find that it gives me the maximum wrap around the supercharger pulley. Puts the return run belt only 1/4" away from the infeed run belt.

I haven't detected any indications of belt slippage ....no belt wear or glazing. Letters and numbering on the belt backside are unscuffed after a couple thousand miles.

I'd like to know if the pulley tensioner is specific to pre-2000 Bonne'* or if the newer 2000-03 Series II are identical. I think the fasteners are different. Someone spoke of a 15 mm wrench to remove it, but I have a T-50 Torque head bolt holding mine on.
My tensioner pulley is 3" OD.
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Old 02-05-2003, 04:32 AM   #9
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This tensioner pulley is supposed to be specific to the Series II L67, which would include you. It'* probably the same diameter shaft, you just hold it on with torx, and others use hex. This was designed specifically to put you back in the center of travel on the tensioner, and still have the benefit of a fuller 'wrap' on the SC pulley.

I called ZZperformance to see if it would work with the pulley ratios I was playing with on a Series 1. It looks like it'll work, so I'm gonna try it. My pulley is coming with a new belt, but this way I get to try something new for the 'team', and maybe gain a little benefit from it.
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Old 02-05-2003, 10:58 PM   #10
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Quote:
This tensioner pulley is supposed to be specific to the Series II L67, which would include you. It'* probably the same diameter shaft, you just hold it on with torx, and others use hex. This was designed specifically to put you back in the center of travel on the tensioner, and still have the benefit of a fuller 'wrap' on the SC pulley.
Great
Sounds like an excellent product and very reasonably priced.
Think I'll buy one too.
Thanks Will
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