I have a question about torque.... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Batmanntexas · 07-25-2014, 11:13 PM

Okay, so the new ZO6 is putting out close to 650HP and 650lbs-ft, all from a 1.7L supercharger (9.5psi). The new Dodge Hellcat is putting out about 700HP and 650lbs-ft, all from a 2.4L supercharger (11psi).

I'm running a 2.9L supercharger (7-8psi) and I make about 630HP and 565lbs-ft.

All three motors are 6.2L V-8's. Is my torque so much lower because I'm not spinning my supercharger anywhere near the RPM that the Corvette and Challenger are? Reason indicates that by spinning the blower faster (overdriving it), it builds boost that much faster. Is that what accounts for their generous torque output?

Thanks in advance for the education.

2012LS3VERT · 07-25-2014, 11:23 PM

A lot of it is rotor design, and to some extent, blower speed. For example, I'm running about 545HP, but the same torque you are, with a 2.3L Maggie. I'm above 500lb/ft at 2500 rpm. If they are using eaton rotors, this would be similar to what I have.

caper · 07-26-2014, 12:46 AM

i would say I am not sure your tq is so much lower. you are quoting crank numbers vs your rw numbers. once they are on a dyno you'll have a better comparison.

JANNETTYRACING · 07-28-2014, 09:50 AM

Quote:

Originally Posted by Batmanntexas

Okay, so the new ZO6 is putting out close to 650HP and 650lbs-ft, all from a 1.7L supercharger (9.5psi). The new Dodge Hellcat is putting out about 700HP and 650lbs-ft, all from a 2.4L supercharger (11psi).

I'm running a 2.9L supercharger (7-8psi) and I make about 630HP and 565lbs-ft.

All three motors are 6.2L V-8's. Is my torque so much lower because I'm not spinning my supercharger anywhere near the RPM that the Corvette and Challenger are? Reason indicates that by spinning the blower faster (overdriving it), it builds boost that much faster. Is that what accounts for their generous torque output?

Thanks in advance for the education.

It does have all to do with the size of the supercharger and how fast they are spinning it.

The faster you spin it the more torque is available because higher air flow is available at peak torque.

You have the Opposite situation you have a large blower that you are spinning slow.

Ted.

Unreal · 07-28-2014, 09:55 AM

Another big reason is cam design/systems. Both of those cars have adjustable cam timing which can add a ton of mid/low range torque.

Batmanntexas · 07-28-2014, 07:27 PM

Thanks everybody! That all makes sense to me.

v8 · 07-28-2014, 07:34 PM

Is there a preference between a screw type supercharge or roots rotor type?

JANNETTYRACING · 07-29-2014, 08:19 AM

Quote:

Originally Posted by v8

Is there a preference between a screw type supercharge or roots rotor type?

TVS is the most efficient from what I read.

Ted.

07-25-2014, 11:13 PM	#1
Batmanntexas Drives: 2012 Camaro SS (2SS) Join Date: Aug 2012 Location: Stafford, VA Posts: 1,372 View My Garage	I have a question about torque.... Okay, so the new ZO6 is putting out close to 650HP and 650lbs-ft, all from a 1.7L supercharger (9.5psi). The new Dodge Hellcat is putting out about 700HP and 650lbs-ft, all from a 2.4L supercharger (11psi). I'm running a 2.9L supercharger (7-8psi) and I make about 630HP and 565lbs-ft. All three motors are 6.2L V-8's. Is my torque so much lower because I'm not spinning my supercharger anywhere near the RPM that the Corvette and Challenger are? Reason indicates that by spinning the blower faster (overdriving it), it builds boost that much faster. Is that what accounts for their generous torque output? Thanks in advance for the education. __________________ 745RWHP/634RWTQ on 93 @ 10psi 806/676 on E85 @ 10psi COTW 9/8/14

07-26-2014, 12:46 AM	#3
caper Drives: 2010 IOM 2ss/RS Join Date: Sep 2009 Location: SoCal, I.E. Posts: 1,545	i would say I am not sure your tq is so much lower. you are quoting crank numbers vs your rw numbers. once they are on a dyno you'll have a better comparison. __________________ Turbonetics running 8lbs boost at 700rwhp tuned by Hi Rev, installed by K&M w/cat-muffler delete, ACS splitter, Fesler GFX, MPD1 spoiler, Custom painted Rally stripes, Cordon CR1 wheels 275/315s, Hotchkiss comp sways and end links, Barton shifter

07-28-2014, 09:55 AM	#5
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Another big reason is cam design/systems. Both of those cars have adjustable cam timing which can add a ton of mid/low range torque. __________________ Nick Corvette Z06 -1200ish rwhp

07-28-2014, 07:27 PM	#6
Batmanntexas Drives: 2012 Camaro SS (2SS) Join Date: Aug 2012 Location: Stafford, VA Posts: 1,372 View My Garage	Thanks everybody! That all makes sense to me. __________________ 745RWHP/634RWTQ on 93 @ 10psi 806/676 on E85 @ 10psi COTW 9/8/14

07-28-2014, 07:34 PM	#7
v8 Drives: 19 Z06 Join Date: Nov 2011 Location: Oakville Ont. Posts: 1,427	Is there a preference between a screw type supercharge or roots rotor type? __________________ Gone but not forgotten: 1974 Corvette Stingray 454 1986 Z28 2009 Mustang GT convertible 2012 45th 2SS Vert 2013 ZL1 M6 2014 Zl1 M6 2014 GT500 2016 Challenger Hellcat M6 www.youtube.com/c/garageking

07-25-2014, 11:23 PM	#2
2012LS3VERT Drives: 2012 2SSRS Vert, Black w/M6 Join Date: Jan 2013 Location: Montgomery, AL Posts: 1,265	A lot of it is rotor design, and to some extent, blower speed. For example, I'm running about 545HP, but the same torque you are, with a 2.3L Maggie. I'm above 500lb/ft at 2500 rpm. If they are using eaton rotors, this would be similar to what I have.