10-12-2010, 11:50 PM | #1 |
Drives: 2010 Camaro 2SS/RS M6 Join Date: Apr 2010
Location: Lexington, NC
Posts: 15
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Crank HP vs RWHP
So my stock LS3 SS camaro was putting down about 345 rwhp (thats about what they average) with 426 hp at the crank. With a few bolt on mods it made 410 rwhp on the dyno....a gain of 65 hp. So does that mean its making 490 hp at the crank? I know crank hp doesn't really matter but just curious.
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10-13-2010, 12:01 AM | #2 |
Drives: 12 Boss 302 Join Date: Sep 2009
Location: Grand Rapids, Mi
Posts: 1,369
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Using simple math, it should be 506 at the crank, but that assumes that the loss through the powertrain remains at the same percentage.
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10-13-2010, 01:04 AM | #3 |
Drives: 2010 White/IOM 2SS/RS M6 Join Date: Jul 2010
Location: Houston, TX
Posts: 1,228
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Yep. Your loss was 19%. However there are a lot of variables to consider. Did you use the same dyno? Were the weather conditions the same? Dynos are primarily tuning tools and the numbers can vary.
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2010 White/IOM Camaro 2SS/RS M6
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10-13-2010, 01:35 AM | #4 |
Drives: 2000 Mustang GT Join Date: Jul 2009
Location: Elgin,SC
Posts: 2,707
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Dynos are a tuning tool and nothing else.
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10-13-2010, 01:37 AM | #5 |
Drives: 2018 Camaro 2SS Join Date: Aug 2010
Location: Lake Stevens
Posts: 1,005
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word. people get way too fixated on numbers.
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10-13-2010, 01:59 AM | #6 |
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
Posts: 7,462
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ya i always tell my friends and people what the crank HP is ... only people that know cars will understand RWHP... its goos to have a idea what crank HP is
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10-13-2010, 02:11 AM | #7 |
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I tell everyone engine HP.. if they car guy I will say wHP too..
Standard is 15% drive train loss on manual .. So take 410wHP divided by .85 is 482HP at engine Stock 430HP times .85 equals 365wHP what a lot of LS3's dyno Ur dyno prob reads low no biggy its just a tool to give estimate to compare & tune
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10-13-2010, 06:42 AM | #8 |
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True dat. Your 65 hp gain at the wheels with 'simple bolt-ons' is a very good gain if you are talking just intake/exhaust mods. Perhaps the first dyno was low for some reason - with 15% losses, a stock LS3 should put down 362 hp at the wheels. Are these corrected numbers?
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10-13-2010, 07:06 AM | #9 |
Okie doke
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Most shops will say there is a 15% loss for the Manual/LS3 camaro .. that being said, 415 at the wheels would put you around 488 at the crank ... (415 / .85 )
That being said, is that 415 at the wheels on a dyno jet .. and as stated above, was your stock and then modded numbers on the same dyno and in similar conditions? thanks, Crowley
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10-13-2010, 09:32 AM | #10 | |
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Quote:
Basicly I baselined at 370rwhp, and 365 max torque. Second dyno with new addons, 441rwhp and 460 max torque. Sure the numbers look great, but it's not a true representation of what i really have. I should have been around the 395 to 405rwhp and just a shade over that for torque. Baseline mods Cold Air Inductions intake Borla S-Type cat back Addons Dynatech Headers Dynatech High flow cats Custom Tune So my next course of action is to take it back to my orginal dyno I used and see what the true gains are.
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10-13-2010, 06:29 PM | #11 |
Moderator.ca
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Your first run seemed a little low. I think the LS3 Camaro's are usually roughly 20 hp more than that
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10-13-2010, 07:27 PM | #12 |
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Most LS3's seem to be 365 to 375
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2015 Corvette Z06.. Lime Rock Park 1:01; Watkins Glen 2:14; Thompson Speedway 1:21
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10-13-2010, 07:35 PM | #13 |
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2SS
YEAH IT CAN BE SIMPLE MATH, BUT YOU CANT GO BY % , LETS SAY SOMEONE DROP IN A 1000 HP ENGINE AND ALL OVER SUDENT YOU LOOSE 19% OF THAT IT WILL KNOW LOOSE 190HP TO THE DRIVE/POWERTRAIN , SORRY BUT THIS DOES NOT MAKE SENSE AT ALL!!!!:bo w:
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10-13-2010, 07:47 PM | #14 | |
Moderator.ca
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Quote:
Drive train losses are more complex than a simple percentage but the loss at the interface of a pair of gears is based on percentage of input power, not an absolute value.
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__________________ Originally Posted by FbodFather My sister's dentist's brother's cousin's housekeeper's dog-breeder's nephew sells coffee filters to the company that provides coffee to General Motors...... ........and HE WOULD KNOW!!!!__________________ Camaro Fest sub-forum |
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