Underdrive pulley
Thread Starter
Racer
Joined: Oct 2003
Posts: 389
Likes: 1
From: Denver co
Underdrive pulley
I heard a lot about those installing an underdrive pulleys.
I don't think the gain is higher than 2 HP? what do you see there
On the other side it will redducce the steering pump and will bring more potential for fluid boiling.
This will redducce the water pump and then the cooling of the engine.
this will redducce the alternator. on the C5 we already have a chr\arging problem woth the battery.
I think this set up is good for 1/4 mile but I don't think it is good for road racing.
What do you think?
I don't think the gain is higher than 2 HP? what do you see there
On the other side it will redducce the steering pump and will bring more potential for fluid boiling.
This will redducce the water pump and then the cooling of the engine.
this will redducce the alternator. on the C5 we already have a chr\arging problem woth the battery.
I think this set up is good for 1/4 mile but I don't think it is good for road racing.
What do you think?
Burning Brakes
Joined: Sep 2005
Posts: 1,208
Likes: 2
From: Long Beach CA
the underdrive pulley would be something you add on while doing a cam swap since the pulley has to come off anyways. Just to replace it by itself would not be worth the labor. I have one one my car and i dont have any charging, steering or p/s issues.
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
Drifting
Joined: Jun 2002
Posts: 1,945
Likes: 41
From: Corinth TX
For those of us who have had the wobbly harmonic balancer it was a no-brainer to put on the underdrive pulley. But I would venture to say that you get more than 2hp. I believe that it is closer to 9-10 rwhp actually. The car seemed to respond quicker as well but you could definitely feel the change. And I have never had a problem with charging, power steering or over heating problems yet. I do say yet though because as soon as I say never I know it will come up.
Race Director
Joined: Oct 1999
Posts: 17,707
Likes: 1,218
From: Phila PA, Bonita Springs FL
I heard a lot about those installing an underdrive pulleys.
I don't think the gain is higher than 2 HP? what do you see there
On the other side it will redducce the steering pump and will bring more potential for fluid boiling.
This will redducce the water pump and then the cooling of the engine.
this will redducce the alternator. on the C5 we already have a chr\arging problem woth the battery.
I think this set up is good for 1/4 mile but I don't think it is good for road racing.
What do you think?
I don't think the gain is higher than 2 HP? what do you see there
On the other side it will redducce the steering pump and will bring more potential for fluid boiling.
This will redducce the water pump and then the cooling of the engine.
this will redducce the alternator. on the C5 we already have a chr\arging problem woth the battery.
I think this set up is good for 1/4 mile but I don't think it is good for road racing.
What do you think?
Le Mans Master
Joined: Nov 2003
Posts: 8,003
Likes: 249
From: Tampa Fl
St. Jude Donor '12-'13-'14
It's another one of those theory modification. You should gain some RWHP, but I agree is it worth the $260+ dollars.
I did it and most guys do it. If I every do modifications to another LS engine, I think Ill skip that mod.
Ive had mine on for two years, and my car has suffered NO down side. No boil of anything, no differance in the power sterring or A/C, nothing in the charging of the car. The only thing that I have heard about is some issues with guys that have big electrical usage from huge stereos and amps not getting enough power. But even that is rare. Its a no harm mod.
Its kind of like Vararam staying you will gain 40 HP.... you dont
I did it and most guys do it. If I every do modifications to another LS engine, I think Ill skip that mod.
Ive had mine on for two years, and my car has suffered NO down side. No boil of anything, no differance in the power sterring or A/C, nothing in the charging of the car. The only thing that I have heard about is some issues with guys that have big electrical usage from huge stereos and amps not getting enough power. But even that is rare. Its a no harm mod.
Its kind of like Vararam staying you will gain 40 HP.... you dont
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Thread Starter
Racer
Joined: Oct 2003
Posts: 389
Likes: 1
From: Denver co
how much is the intake and how much is the headers I don't know but the gain was much more than I expected. So far on every track event I went for the past two years the guys with Z never believe me I just have headers and intake.
for the steering fluid some of you do not understand but I have 285x18slicks tires on the front and with T1 spring sway bar and schocks.
the effort on the colum is much more than on stock tire and suspension.
Then the fluid was boiling. I already have to change my steering colum. I add a radiator and put High temp fluid. it is better but I'm still at the limit of boiling. I think I will install a bigger radiator