underdrive pulleys - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

BELLSS · 12-31-2009, 06:26 PM

This question is for the engine builders and tuners , are underdrive pulleys worth the money for a small rwhp gain ?

SSTony · 12-31-2009, 06:46 PM

if you do a dollar per hp compaired to everything else then yes.

underdrive pully is 200 / 5(hp) = $40 per hp

headers $1200/ 30(hp)= $40 per hp

cai 300/ 15(hp) = $20 per hp

Supercharger $7500(installed)/ 175(hp) = $42.85(per HP)

I can keep going but its not bad

Camaro21 · 12-31-2009, 08:49 PM

Has anyone seen a negative effect with installing the underdrive pulley? Overheating, Low Alternator Output, etc.

Badger · 01-01-2010, 11:36 AM

Quote:

Originally Posted by Camaro21

Has anyone seen a negative effect with installing the underdrive pulley? Overheating, Low Alternator Output, etc.

Good Question

liquidfire350 · 01-01-2010, 12:56 PM

i had one on my 4th gen, only downside i noticed was low light output (interior and headlamps) at idle

there was also the crankbolt that would sometimes loosen up causing the pulley to move and the belt to come off, but i dont think that is a common issue

ThunderSS · 01-02-2010, 06:55 AM

NO over heating... I have the SLP Underdrive Pulley. Alternator still maintains the 13V charging... the only problem you may have is over spinning the Alternator..
Just get you a smaller pulley for the alternator... and all is solved..

camaro1 · 01-02-2010, 07:11 AM

Quote:

Originally Posted by ThunderSS

NO over heating... I have the SLP Underdrive Pulley. Alternator still maintains the 13V charging... the only problem you may have is over spinning the Alternator..
Just get you a smaller pulley for the alternator... and all is solved..

how could you over spin the alternator with the slp underdrive pulley,, you realize the underdrive pulley spins all the accessories slower than the factory crank pulley.

on some vehicles when you buy an underdrive pulley set they give you a underdrive crank pulley and a smaller (overdrive) alternator pulley to bring the alt speed back up to factory speed,,

the 2010 camaro only gets a smaller crank pulley that spins all the accessories slower, and so far no one has reported that the voltage has dropped enough at idle to worry about an alternator pulley,, but there is no way you will overspin the alternator with a underdrive crank pulley

Bentley78 · 01-02-2010, 03:31 PM

I dont think its worth spending a couple hundred for just 5hp. I know it adds up over time but you are not going to feel 5hp diff in a 400+hp motor.

I'd rather spend 1k and get a significant upgrade but thats just me.....who knows, im sure i will do this down the road after i get the major things out of the way hahaha

MKS · 01-02-2010, 03:43 PM

its worth it when doing a cam

Camaro21 · 01-02-2010, 08:06 PM

Thanks for everyone's input.

Bentley78 · 01-03-2010, 01:56 PM

Quote:

Originally Posted by MKS

its worth it when doing a cam

I'm not aware of that, can you explain?

Malice · 01-03-2010, 02:03 PM

I really thought about getting an underdrive pulley, but I opted out of it.

My 2SS is laden with electronics. WHen I'm sitting in traffic with the heat on, wipers going, headlights on, heated seats going, rear defroster on, CD player going, on star working, bluetooth going, etc.... I imagine the alternator would begin to struggle.

My old LT1 stripper was just fine with UDP's, but this car has so many electronics, I don't think I want to stress any systems with voltage irregularities.

SSTony · 01-03-2010, 02:26 PM

I want an underdrive pully but since i will get a supercharger down the road its a waste.

POWERFREAK · 01-03-2010, 02:33 PM

Quote:

Originally Posted by Bentley78

I'm not aware of that, can you explain?

I think he meant, it's worth it because you're taking everything apart anyway, might as well swap it in.

12-31-2009, 06:26 PM	#1
BELLSS Drives: 2SS/RS 6spM Summit White/Blk-Orng Join Date: Oct 2009 Location: Elkhorn City,Kentucky Posts: 14	underdrive pulleys This question is for the engine builders and tuners , are underdrive pulleys worth the money for a small rwhp gain ?

12-31-2009, 06:46 PM	#2
SSTony Drives: SS Camaro Join Date: Jul 2009 Location: Piscataway NJ Posts: 1,782 View My Garage	if you do a dollar per hp compaired to everything else then yes. underdrive pully is 200 / 5(hp) = $40 per hp headers $1200/ 30(hp)= $40 per hp cai 300/ 15(hp) = $20 per hp Supercharger $7500(installed)/ 175(hp) = $42.85(per HP) I can keep going but its not bad __________________

01-02-2010, 06:55 AM	#6
ThunderSS Drives: 2010 CGM 2SS/RS Join Date: Jul 2009 Location: East of Houston Posts: 804 View My Garage	NO over heating... I have the SLP Underdrive Pulley. Alternator still maintains the 13V charging... the only problem you may have is over spinning the Alternator.. Just get you a smaller pulley for the alternator... and all is solved.. __________________ 2010 Camaro SS/RS HKE Forged 416 CID http://www.fquick.com/ThunderZ28 510 HP/485 Ft. Lbs

01-03-2010, 02:03 PM	#12
Malice Drives: 2022 Camaro 2SS 1LE M6 Join Date: Nov 2009 Location: Ridgecrest California Posts: 80	I really thought about getting an underdrive pulley, but I opted out of it. My 2SS is laden with electronics. WHen I'm sitting in traffic with the heat on, wipers going, headlights on, heated seats going, rear defroster on, CD player going, on star working, bluetooth going, etc.... I imagine the alternator would begin to struggle. My old LT1 stripper was just fine with UDP's, but this car has so many electronics, I don't think I want to stress any systems with voltage irregularities. __________________ 2022 2SS 1LE M6

01-03-2010, 02:26 PM	#13
SSTony Drives: SS Camaro Join Date: Jul 2009 Location: Piscataway NJ Posts: 1,782 View My Garage	I want an underdrive pully but since i will get a supercharger down the road its a waste. __________________

12-31-2009, 08:49 PM	#3
Camaro21 Drives: SOLD - 2013 M6 ZL1 Join Date: Jul 2009 Location: Texas Posts: 5,041 View My Garage	Has anyone seen a negative effect with installing the underdrive pulley? Overheating, Low Alternator Output, etc.

01-01-2010, 12:56 PM	#5
liquidfire350 Drives: 2010 Black SS/RS Join Date: Nov 2008 Location: Montgomery, IL Posts: 295	i had one on my 4th gen, only downside i noticed was low light output (interior and headlamps) at idle there was also the crankbolt that would sometimes loosen up causing the pulley to move and the belt to come off, but i dont think that is a common issue

01-02-2010, 03:31 PM	#8
Bentley78 Rice Cooker Drives: Avalanche Z/71, 2010 Camaro2SS Join Date: Jun 2008 Location: Hawaii/Phoenix Posts: 591	I dont think its worth spending a couple hundred for just 5hp. I know it adds up over time but you are not going to feel 5hp diff in a 400+hp motor. I'd rather spend 1k and get a significant upgrade but thats just me.....who knows, im sure i will do this down the road after i get the major things out of the way hahaha

01-02-2010, 03:43 PM	#9
MKS Drives: SS Join Date: Oct 2009 Location: Kuwait Posts: 16	its worth it when doing a cam

01-02-2010, 08:06 PM	#10
Camaro21 Drives: SOLD - 2013 M6 ZL1 Join Date: Jul 2009 Location: Texas Posts: 5,041 View My Garage	Thanks for everyone's input.

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