Upper and Lower Pulley combinations. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ZL W0N · 11-20-2015, 10:10 AM

What is the biggest lower pulley you can combine with a 2.5 upper, before it starts to get unsafe?

ZL1Kid_AL · 11-20-2015, 10:25 AM

http://www.camaro5.com/forums/showthread.php?t=283952

Take a read here. Should answer your question

Stephen12ZL1 · 11-20-2015, 12:17 PM

9.1" lower + 2.55" upper is the max

Ksacamaro · 11-20-2015, 12:19 PM

8.66 is just below the safe limit which will be 28% overdriving the supercharger wirh the 2.55 upper , the safety limit is 30% . anything more than that is risky .I Dont know if you could go above that with the excuse of a cam/headers (since they drop boost) , will it be safe or not . not sure ...

ZL W0N · 11-20-2015, 12:46 PM

I did look at that LSA pulley chart that sometimes floats around the forum. I saw anything above 30% was considered unsafe, but it also says if the engine RPMs are greater than 6500. The LSA redlines at 6200rpm, so you should still be safe, right?

Ksacamaro · 11-20-2015, 02:09 PM

Most tuners set the rpm limit to 6500 , so when you tune it will be shifting @ 6500rpm...

Stephen12ZL1 · 11-20-2015, 03:07 PM

LSA is way past torque peak at 6500rpm...shift more like 6000-6100 unless you have swapped the cam.

ZL W0N · 11-20-2015, 05:53 PM

Quote:

Originally Posted by Stephen12ZL1

LSA is way past torque peak at 6500rpm...shift more like 6000-6100 unless you have swapped the cam.

Yeah, I figured if the stock tune on an A6 is set up to shift at 5800 in Drive mode and 6000 in Sport mode, then that's probably what's best. I've redlined a few times, shifting at 6200 with the paddles and it's not as good. You can't beat the shifts in Sport mode.

11-20-2015, 10:10 AM	#1
ZL W0N GuitarmageddonZL1 Drives: ‘13 ZL1, ‘17 TT ZL1, ‘17 Silverado Join Date: Feb 2015 Location: Harrisburg, PA Posts: 432	Upper and Lower Pulley combinations. What is the biggest lower pulley you can combine with a 2.5 upper, before it starts to get unsafe? __________________

11-20-2015, 10:25 AM	#2
ZL1Kid_AL Drives: 2014 ZL1- Summit White M6 Join Date: Aug 2014 Location: Thornton, Colorado Posts: 462	http://www.camaro5.com/forums/showthread.php?t=283952 Take a read here. Should answer your question __________________ 750whp @ 13psi Garage Built on Jack Stands.. 850++ 100 shot of sauce

11-20-2015, 12:17 PM	#3
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	9.1" lower + 2.55" upper is the max __________________ '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)

11-20-2015, 12:19 PM	#4
Ksacamaro Drives: 2014 Camaro ZL1 Join Date: Dec 2014 Location: Saudi arabia Posts: 102	8.66 is just below the safe limit which will be 28% overdriving the supercharger wirh the 2.55 upper , the safety limit is 30% . anything more than that is risky .I Dont know if you could go above that with the excuse of a cam/headers (since they drop boost) , will it be safe or not . not sure ... __________________ Lingenfelter 630Hp Package , Afco Heatexchanger , Moroso Catchcan , D3 Tank , Siemens 63Pds/hr Injectors , Custom tune.

11-20-2015, 12:46 PM	#5
ZL W0N GuitarmageddonZL1 Drives: ‘13 ZL1, ‘17 TT ZL1, ‘17 Silverado Join Date: Feb 2015 Location: Harrisburg, PA Posts: 432	I did look at that LSA pulley chart that sometimes floats around the forum. I saw anything above 30% was considered unsafe, but it also says if the engine RPMs are greater than 6500. The LSA redlines at 6200rpm, so you should still be safe, right? __________________

11-20-2015, 02:09 PM	#6
Ksacamaro Drives: 2014 Camaro ZL1 Join Date: Dec 2014 Location: Saudi arabia Posts: 102	Most tuners set the rpm limit to 6500 , so when you tune it will be shifting @ 6500rpm... __________________ Lingenfelter 630Hp Package , Afco Heatexchanger , Moroso Catchcan , D3 Tank , Siemens 63Pds/hr Injectors , Custom tune.

11-20-2015, 03:07 PM	#7
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	LSA is way past torque peak at 6500rpm...shift more like 6000-6100 unless you have swapped the cam. __________________ '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)