underdrive pulley. wat to expect?
This is a discussion on underdrive pulley. wat to expect? within the General Help forums, part of the LSx Technical Help Section category; I'm thinking about getting an underdrive pulley for my car to get a couple hp out of it. I've gotten ...
02-07-2010, 05:11 AM #1
underdrive pulley. wat to expect?
I'm thinking about getting an underdrive pulley for my car to get a couple hp out of it. I've gotten a little used to it. I've been wondering wat kinda power gains should I expect with my current tune. And would it mess with my tune or am I fine just throwing the bugger on there? Finally I'm wondering which one I should get? I've been looking at either the slp one for like 180 for a harmonic balancer+pulley. Or an asp "racing" set which has crank and alternator pulleys for 220. Which is better? Which would gain me more? And does tune snafu?2002 z28-slp cai, slp loudmouth, slp tuned headers, slp 85 mm MAF, slp high flow cats, 3" y-pipe and collectors
331.6 rwhp/356.9 rwtq
02-07-2010, 06:01 AM #2
is your car a daily driver?
02-07-2010, 06:04 AM #3
Yes. But I never really use ac. Heat in the winter. And don't really listen to radio that much
02-07-2010, 06:45 AM #4
You wont need a re-tune. More of a headache in my opinion. You wont pick up any Hp that you will feel.
If its a DD i wouldnt mess with the Alt pulley although its your call, also ensure you pick up a new Balancer bolt if you decide to swap it.
J2001 SS, Its not the car its the Driver that matters....
02-07-2010, 06:56 AM #5
- Join Date
- Sep 2005
- Port St. Lucie Fl
- 2008 C6 Corvette LS3
you would gain anywhere from 3-5 hp depending on other mods.
02-07-2010, 07:21 AM #6
Only 3-5? Their site claims 13 rwhp on stock set up? Is it worth getting the pulley or just forget about it?
02-07-2010, 10:13 AM #7
02-07-2010, 10:16 AM #8
well guess i just saved myself some money
02-07-2010, 11:49 AM #9
- Join Date
- Jun 2009
- coon rapids, MN
I herd a .10 at the drag strip.
02-07-2010, 07:17 PM #10
13 rwhp? now thats some false advertising!
02-07-2010, 09:56 PM #11
it doesnt "add" any horsepower it just "frees up" more horsepower.....
02-08-2010, 04:50 AM #12
So its not worth the hp it "frees" up? Wat would be wrong with messing with the alt pulley on a dd?
02-08-2010, 04:26 PM #13
02-09-2010, 05:00 AM #14
Well I'm going to do a cam... eventually. Right now I was thinking about doing a 9" with 3.73's and a stall. Maybe something around 3000. I get 10 mpgs as it is anyway. Sould the pulley be kinda worth it in the long run for future upgrade + mpgs?
02-09-2010, 06:07 AM #15
What is done to your car thats only letting you get 10 mpgs?!?!
02-09-2010, 07:57 AM #16
I was looking to get the most out of my stock block so I purchased one on the cheap. It was used got it for $115 shipped. SLP unit, netted about 7hp on the dyno. Only thing I didn't like was since it is smaller than stock it spins the power stearing slower and stearing is slightly sluggish, other than that it's fine.
I'll be selling mine once I go to a larger cube motor.
02-09-2010, 08:27 AM #17
02-09-2010, 08:32 AM #18
I had one on mine for a while. It didn't do squat for ET or MPH on my car.
What it did do, is cause the voltage to drop while idling around, especially at night with lights, heater, etc... running. I could live with that...
What I couldn't live with is how I noticed the car running warmer when idling around as well. To the point where the fans would continuously run at idle, especially with the A/C on. It was just turning the water pump too slow. As soon as I gave the car some gas and held rpms at around 1500,,,the temps would drop like a rock and the fans would kick off. I run a 170 stat with the fans set to shut off at 185,,,and it wouldn't even cool it that far when idling
That was a problem while just living in Ohio where summer temps hit the 90's. I knew moving to AZ would be even worse, so the pulley came off.
02-09-2010, 08:36 AM #19
02-09-2010, 08:41 AM #20
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