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

370zyzfr1 · 03-18-2015, 10:09 PM

I spoke with a few tuners around here. One said thsy it's best to do an upper pulley instead of the bottom at 10% because of heat soak. But then I hear that the top pulley can lose grip and spin easier.

Which pulley do you mod and why?

Also what is a heat exchanger and should I use one on a 10% pulley and CAI mod? Maybe a stupid question but guessing it helps with heat.

vatechguy3 · 03-19-2015, 05:51 AM

Whether you change the top pulley or the lower, then result is making the SC spin faster.

You have a heat exchanger now. Changing it out with a larger/more efficient model is to gain more cooling capability.

Tony

ZL1Kid_AL · 03-19-2015, 07:49 AM

it doesn't matter if you change lower or upper, What matters is how many RPMs you are going to spin the SC.. Either one will make More RPMs to the SC usually meaning more boost but will also generate more heat the harder you spin it..

As for using a heat exchanger with a 10% pulley. Most people don't run a heat exchanger until they are in the 20%+ overdrive range, maybe a little less in hot climate areas, but it all depends on when/if your car gets heat soaked, Heat exchanger are a great mod IMO, for your setup I would think money could go else where for now until you turn up the boost more

toyosuprablue · 03-19-2015, 07:54 AM

As others have mentioned, heat soak doesn't change based on which pulley you swap out. I chose to do the lower pulley for the following reasons:

1) The supercharger enclosure has to come off the motor in order to swap out the top pulley.
2) The lower pulley had to be removed for cam install so I swapped it at the same time.

Stephen12ZL1 · 03-19-2015, 08:29 AM

IMHO a lower makes more sense because it can be swapped without removing the entire supercharger and the ring can be swapped for desired boost levels. I know Lingenfelter makes an upper pulley that has an interchangable ring also. It is easier to reverse if necessary too.

mmarx82 · 03-19-2015, 09:40 AM

So in conclusion you better go find a different tuner because it's obvious they have no idea what they are talking about.

370zyzfr1 · 03-19-2015, 10:33 AM

Quote:

Originally Posted by mmarx82

So in conclusion you better go find a different tuner because it's obvious they have no idea what they are talking about.

I think they are decent. He just said heat soak is more of an issue with the lower pulley. Just couldn't figure out why. And maybe that's not true.

Thanks for the replies guys.

JANNETTYRACING · 03-19-2015, 11:21 AM

Quote:

Originally Posted by 370zyzfr1

I think they are decent. He just said heat soak is more of an issue with the lower pulley. Just couldn't figure out why. And maybe that's not true.

Thanks for the replies guys.

Which pulley you use to spin the supercharger faster has Zero difference in Heating the intake air.

It is about how fast you spin the supercharger and the boost level that affect heating the intake air.

1 psi boost equals about 11 degree rise in IAT over ambient, for example 80 degree intake air +10 PSI boost will result in discharge temps of 190 degrees.

The intercooler will take that heat away to a point close to Ambient.

I like to stay around 11-13 psi and can make upwards of 650 RWHP at this boost level with the right combination of parts.

The lower is always the best way to spin the supercharger faster.

Ted.

69ZLover · 03-19-2015, 03:13 PM

Putting on a smaller top pulley with stock belts reduces the belt surface and can result in slippage (More drag) at higher boosts.

JDP Sales · 03-19-2015, 03:16 PM

We prefer to do a combination of both the upper and lower pulleys. I don't like to go too small up top for risk of belt slip and I don't like to go too large down low because I don't like to add a lot of mass to the crank pulley.

Even stock cars can benefit from a better heat exchanger, especially if you track the car.

If I can answer any questions, feel free to call, PM or email me.

Best regards,

Tyler
888-308-6007

370zyzfr1 · 03-19-2015, 09:29 PM

How much do aftermarket heat exchangers help? With a basic 75 hp package

jessrayo · 03-21-2015, 12:04 PM

Seems everyone has forgot about this but some of the early 2014 models have a spring isolator in the upper pulley rather than the solid isolator that is in all of the newer cars. This isolator was a major factor in the supercharger warranty extension. If your car was build in late 2013 as a '14 model it should have that isolator changed and it can easily be done with the upper pulley. If you have the solid isolator then just do the lower pulley.

03-18-2015, 10:09 PM	#1
370zyzfr1 Drives: 2014 Camaro Zl1 Tripple Black! Join Date: Nov 2014 Location: Iowa Posts: 383	Question about pulleys I spoke with a few tuners around here. One said thsy it's best to do an upper pulley instead of the bottom at 10% because of heat soak. But then I hear that the top pulley can lose grip and spin easier. Which pulley do you mod and why? Also what is a heat exchanger and should I use one on a 10% pulley and CAI mod? Maybe a stupid question but guessing it helps with heat.

03-19-2015, 05:51 AM	#2
vatechguy3 Drives: 2014 ZL1 M6 Join Date: Jul 2014 Location: Virginia Posts: 493	Whether you change the top pulley or the lower, then result is making the SC spin faster. You have a heat exchanger now. Changing it out with a larger/more efficient model is to gain more cooling capability. Tony __________________ 2014 ZL1 M6 Bone stock, for now! 2001 Z28 M6 !cags, !air, FTP 85mm Lid, Z06 85mm MAF, P&P TB !4x4, Strano Springs, Strano Sways, Koni 4/4s, Watts Link ARH LTs, ARH catted Y, SLP catback with Dual/Dual Muffler, SLP CME and Valance OE Wheels Machined Face C5 DDs, 18x10.5s, with 295/35-18s on all 4 corners! 352rwhp and 366rwtq

03-19-2015, 07:49 AM	#3
ZL1Kid_AL Drives: 2014 ZL1- Summit White M6 Join Date: Aug 2014 Location: Thornton, Colorado Posts: 462	it doesn't matter if you change lower or upper, What matters is how many RPMs you are going to spin the SC.. Either one will make More RPMs to the SC usually meaning more boost but will also generate more heat the harder you spin it.. As for using a heat exchanger with a 10% pulley. Most people don't run a heat exchanger until they are in the 20%+ overdrive range, maybe a little less in hot climate areas, but it all depends on when/if your car gets heat soaked, Heat exchanger are a great mod IMO, for your setup I would think money could go else where for now until you turn up the boost more __________________ 750whp @ 13psi Garage Built on Jack Stands.. 850++ 100 shot of sauce

03-19-2015, 08:29 AM	#5
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	IMHO a lower makes more sense because it can be swapped without removing the entire supercharger and the ring can be swapped for desired boost levels. I know Lingenfelter makes an upper pulley that has an interchangable ring also. It is easier to reverse if necessary too. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

03-19-2015, 09:40 AM	#6
mmarx82 Drives: '12 ZL1 #1609 Join Date: Feb 2010 Location: Georgia Posts: 1,762	So in conclusion you better go find a different tuner because it's obvious they have no idea what they are talking about. __________________ Life is too short to drive cars that suck. My build Thread

03-19-2015, 07:54 AM	#4
toyosuprablue Account Suspended Drives: 2013 ZL1 Black M6 Join Date: Dec 2012 Location: Nyack, NY Posts: 370 View My Garage	As others have mentioned, heat soak doesn't change based on which pulley you swap out. I chose to do the lower pulley for the following reasons: 1) The supercharger enclosure has to come off the motor in order to swap out the top pulley. 2) The lower pulley had to be removed for cam install so I swapped it at the same time.

03-19-2015, 03:13 PM	#9
69ZLover Drives: 2015 ZL1 Join Date: Mar 2015 Location: Oregon Posts: 55	Putting on a smaller top pulley with stock belts reduces the belt surface and can result in slippage (More drag) at higher boosts.

03-19-2015, 03:16 PM	#10
JDP Sales Drives: Chevys at the limit Join Date: Nov 2010 Location: SLC, UT Posts: 9,621	We prefer to do a combination of both the upper and lower pulleys. I don't like to go too small up top for risk of belt slip and I don't like to go too large down low because I don't like to add a lot of mass to the crank pulley. Even stock cars can benefit from a better heat exchanger, especially if you track the car. If I can answer any questions, feel free to call, PM or email me. Best regards, Tyler 888-308-6007

03-19-2015, 09:29 PM	#11
370zyzfr1 Drives: 2014 Camaro Zl1 Tripple Black! Join Date: Nov 2014 Location: Iowa Posts: 383	How much do aftermarket heat exchangers help? With a basic 75 hp package

03-21-2015, 12:04 PM	#12
jessrayo Speed Freak Drives: 2013 ZL1 Camaro, 2016 Camaro SS Join Date: Jun 2013 Location: Ardmore, OK Posts: 2,637 View My Garage	Seems everyone has forgot about this but some of the early 2014 models have a spring isolator in the upper pulley rather than the solid isolator that is in all of the newer cars. This isolator was a major factor in the supercharger warranty extension. If your car was build in late 2013 as a '14 model it should have that isolator changed and it can easily be done with the upper pulley. If you have the solid isolator then just do the lower pulley. __________________ 2016 SS -AGP twin Borg Warner 7163 EFR's, LT4 mechanical pump, LT4 injectors, Walbro 255 low side, Castrol SRF. 734whp/759 tq 2013 ZL1 -ADM - 427 LSX 6 bolt, O-ringed block built by LME. Twin PT6466 turbos. RPM custom manual trans, RPS Quad carbon clutch, 9" Hendrix rear diff & axles. ADM/squash fuel system, Ron Davis radiator, Spal fans, AGP air to air, turbo plumbing. LPE oil cooler, rear bushing upgrade, roll bar...etc. rwhp 1400+... 212.5mph, best Texas mile to date.