Crank HP vs RWHP

[GQ4Life]

Originally Posted by oldfriend

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:

It doesn't make sense to me either except for stock vehicles where more HP more beefed the drivetrain but everyone uses it. Shelby, & the rest. Every magazine. If I was loaded i would remove my engine & put on engine dyno to see what the drivetrain loss is now.

[Sax1031]

Originally Posted by DGthe3

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.

[GQ4Life]

Talking bout when u install say 3.73 gears & increase whp but dyno reads lower?

[VaderCamaro2010]

Sorry, the 345 hp was a mistype. So assuming the average LS3 puts down roughly 365 then there was a gain of around 45hp.
Just trying to figure out the current crank power because unfortunetly I wasn't able to get an initial dyno pull before the mods were added.
So is it safe to say 410rwhp/.85 = 482hp?

[GQ4Life]

Originally Posted by VaderCamaro2010

Sorry, the 345 hp was a mistype. So assuming the average LS3 puts down roughly 365 then there was a gain of around 45hp.
Just trying to figure out the current crank power because unfortunetly I wasn't able to get an initial dyno pull before the mods were added.
So is it safe to say 410rwhp/.85 = 482hp?

Yes.. everyone using the 15% drivetrain loss so any car guy wont give you shit. Like the older shelby super snakes were rated 725HP but alot dynoed 615wHP to 635wHP.
Rule of thumb to have room what every engine HP you calculate round it down to the nearest 25 interval. Like my 610wHP works out to 717HP but I always say 700HP. Leaves room on the table.

[gman1970]

so i went to dyno my 2010 v6 with k&n intake and borla catback and ran 248rwhp/228 torque... is this crap for the mods i have or what is stock giving out???

[REDXIIIDave]

Originally Posted by GQ4Life

Talking bout when u install say 3.73 gears & increase whp but dyno reads lower?

This makes no sense.

[GB EB]

Originally Posted by mikeSS

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

Same here.

My tune guy that did our Dyno told me it is a 22% loss to the RW because we have the auto trans.

We are at 382 RWHP so I just tell the non-gear heads we have 490 horses...They would not understand if I said we had 382 but they see a commercial saying the stock Camaro has 400.

it's just easier that way.

[DGthe3]

Originally Posted by gman1970

so i went to dyno my 2010 v6 with k&n intake and borla catback and ran 248rwhp/228 torque... is this crap for the mods i have or what is stock giving out???

Depends ... what did it read when stock??

[gman1970]

Originally Posted by DGthe3

Depends ... what did it read when stock??

i didnt dyno it when i got it

[VR Baron]

Originally Posted by gman1970

i didnt dyno it when i got it

It all depends on the dyno and temps, A6 or m6 trans? We have seen stock all over the place on this forum, from low 226 in the heat with a auto to 260 with the manual."normal" dynojet" auto 240-250, manual 250-260.
Your intake and axelback good for about 12 combined on the dyno.

[gman1970]

Originally Posted by blackbee

It all depends on the dyno and temps, A6 or m6 trans? We have seen stock all over the place on this forum, from low 226 in the heat with a auto to 260 with the manual."normal" dynojet" auto 240-250, manual 250-260.
Your intake and axelback good for about 12 combined on the dyno.

i have the a6,temps were in the mid 50's and intake and full catback u think i got 12 total possibly ? k&n claims intake dyno'd 14.96 for the v6 and don't know what borla catback claims.HELL if normal is 240ish i ididn't gain really anything as my run was 248????? i know i must of gained some as the car definately is quicker and better sounding.

[dutchnrican]

Originally Posted by VaderCamaro2010

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.

can you list the bolt on mods that gave you those numbers, please. thanks.

[gman1970]

Originally Posted by gman1970

i have the a6,temps were in the mid 50's and intake and full catback u think i got 12 total possibly ? k&n claims intake dyno'd 14.96 for the v6 and don't know what borla catback claims.HELL if normal is 240ish i ididn't gain really anything as my run was 248????? i know i must of gained some as the car definately is quicker and better sounding.

heard back from dyno shop and they said 320 to the crank is most likely what i have now