Determining Crank HP? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

mst504 · 01-11-2012, 01:33 PM

How are you guys figuring up your Crank HP? Adding 20% to your RWHP dyno numbers? Does that still hold true with my LS3 conversion?

I ask because I have a few custom tags in mind, and if I can't get them I'm going to do a HP tag, and since Crank HP is what is advertised and what everyone generally understands more than RWHP, I want to use my Crank HP.

I've had people ask me what the HP of these cars are stock, and when I tell them what the RWHP is, they're usually like, "huh?".

Appreciate the help!!

camslambam · 01-11-2012, 01:42 PM

Did you ever get a base dyno?

Stock crank was 400, so that divided on what your baseline was.

I base lined 310 on my l99. 22.5%. Your loss will range from anywhere really 20-30%.

Assuming you lost 20% you're at 606 crank.

mst504 · 01-11-2012, 01:45 PM

Quote:

Originally Posted by camslambam

Did you ever get a base dyno?

Stock crank was 400, so that divided on what your baseline was.

I base lined 310 on my l99. 22.5%. Your loss will range from anywhere really 20-30%.

Assuming you lost 20% you're at 606 crank.

Dang, no I didn't get a base dyno, I bought a Hennessey Car it was already supercharged when I got it.

tony1 · 01-11-2012, 01:51 PM

it's not just the drivtrain loss if you running a Supercharger they are not 100% efficient so you are using eating HP for that also ...

HumanWiki · 01-11-2012, 02:11 PM

I'll throw my question in this thread since I have similar.

2010 Camaro w/ LS3 and TVS2300... OEM wheel, tires, clutch, transmission, gear.

560RWHP/520RWTQ -- What is that at engine, thereabouts... I've been told and using 660HP/615TQ

stanwilliams · 01-11-2012, 02:21 PM

Divide wheel hp by .85 for manuals for a 15% loss.
Divide wheel hp by .75 for autos for a 25% loss. use .775 if you figure 22.5% loss.

mst504 · 01-11-2012, 04:02 PM

Went to the tag office with 3 in mind.
NOTSTOK - Taken
NOTSTOC - Approved
600PLUS - Would not approve for some reason, said something like its similar to what they use for their vehicles.

So I went with N0TST0C, I wanted it with a K but oh well. Do you think it gets my point across?

I have to have a lame temporary tag until it comes in, said it could be 90 Days.

01-11-2012, 01:33 PM	#1
mst504 Caffeine Injected Drives: 2010 Orange SS L99 HPE Supercharged Join Date: Sep 2010 Location: Woodstock, Georgia Posts: 670	Determining Crank HP? How are you guys figuring up your Crank HP? Adding 20% to your RWHP dyno numbers? Does that still hold true with my LS3 conversion? I ask because I have a few custom tags in mind, and if I can't get them I'm going to do a HP tag, and since Crank HP is what is advertised and what everyone generally understands more than RWHP, I want to use my Crank HP. I've had people ask me what the HP of these cars are stock, and when I tell them what the RWHP is, they're usually like, "huh?". Appreciate the help!! __________________ 2010 2SS HPE Supercharged Installed- LS3 Conversion with LS9 Cam, Maggie 3.6 Pulley, 1:1 Cog Drive, KB BAP, Borla ATAK, Kooks LT, Yank Torque Converter, Vmax TB, RX Breather, Elite Engineering Catch Can, PFADT Rear Arm Package, ADM Transmission Cooler Purchased Needs To Be Installed - Dual Aeroforce Gauges To Come - More Suspension, More RWHP 505rwhp 547lbs Torque at 7lbs of Boost Converted, tuned, by Atlpf.com Last edited by mst504; 01-11-2012 at 02:47 PM.

01-11-2012, 01:51 PM	#4
tony1 Drives: 2SS/RS Vortech/L99 Join Date: Jan 2010 Location: CHICAGO Posts: 473	it's not just the drivtrain loss if you running a Supercharger they are not 100% efficient so you are using eating HP for that also ... __________________

01-11-2012, 02:11 PM	#5
HumanWiki Former 5th Gen owner Drives: 2012 IOM Grand Sport 4LT Join Date: Jun 2010 Location: Chicago, IL Posts: 2,271	I'll throw my question in this thread since I have similar. 2010 Camaro w/ LS3 and TVS2300... OEM wheel, tires, clutch, transmission, gear. 560RWHP/520RWTQ -- What is that at engine, thereabouts... I've been told and using 660HP/615TQ __________________ 2012 IOM Grand Sport 4LT Auto

01-11-2012, 02:21 PM	#6
stanwilliams 3000 hp 648 ci beast Drives: 86 Outlaw 10.5 Camaro, 2SS/RS LS3 Join Date: Jul 2009 Location: Marion, KS Posts: 148	Divide wheel hp by .85 for manuals for a 15% loss. Divide wheel hp by .75 for autos for a 25% loss. use .775 if you figure 22.5% loss. __________________ 2SS/RS, LS3, 6M, IOM w/black hockey, IO interior, sunroof mods: Subthump setup. Whipple supercharger....Need suspension upgrades now... 4" stroker kit, ARH, cam on my wish list.

01-11-2012, 04:02 PM	#7
mst504 Caffeine Injected Drives: 2010 Orange SS L99 HPE Supercharged Join Date: Sep 2010 Location: Woodstock, Georgia Posts: 670	Went to the tag office with 3 in mind. NOTSTOK - Taken NOTSTOC - Approved 600PLUS - Would not approve for some reason, said something like its similar to what they use for their vehicles. So I went with N0TST0C, I wanted it with a K but oh well. Do you think it gets my point across? I have to have a lame temporary tag until it comes in, said it could be 90 Days. __________________ 2010 2SS HPE Supercharged Installed- LS3 Conversion with LS9 Cam, Maggie 3.6 Pulley, 1:1 Cog Drive, KB BAP, Borla ATAK, Kooks LT, Yank Torque Converter, Vmax TB, RX Breather, Elite Engineering Catch Can, PFADT Rear Arm Package, ADM Transmission Cooler Purchased Needs To Be Installed - Dual Aeroforce Gauges To Come - More Suspension, More RWHP 505rwhp 547lbs Torque at 7lbs of Boost Converted, tuned, by Atlpf.com Last edited by mst504; 01-11-2012 at 04:23 PM.

01-11-2012, 01:42 PM	#2
camslambam Account Suspended Drives: 2010 SS, 06 SRT10 Ram Join Date: Nov 2011 Location: C. America Posts: 1,668	Did you ever get a base dyno? Stock crank was 400, so that divided on what your baseline was. I base lined 310 on my l99. 22.5%. Your loss will range from anywhere really 20-30%. Assuming you lost 20% you're at 606 crank.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DIY: LS3 Camshaft Install (a lot of pictures, may take a moment to load)	robertway	Camaro DIY & HOW-TO instructions & discussions	203	05-03-2013 09:23 AM
Crank HP vs RWHP	VaderCamaro2010	5th Gen Camaro SS LS LT General Discussions	28	09-25-2011 05:32 PM
Stock Crank Pulley Pinned???	Pt_killa	Forced Induction - V6	14	11-30-2010 02:44 PM
TVS 2300 Jackshaft vs Crank Pulley Change	DNA	Forced Induction - V8	6	07-25-2010 09:20 PM
For those that are having to pull the crank pulley off.	ThunderSS	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	19	11-06-2009 02:53 PM