Engine HP = BHP = RWHP
#3
Race Director
So if you have a manual with 350hp, it should have about ~310rwhp.
Auto would be less at ~290rwhp.
#5
Drifting
#8
Drifting
#9
Safety Car
Member Since: Jun 2009
Location: Frederick, Maryland
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Hope you don't mind..mods in his profile....
"Patriot heads & cam, LS6 Intake & injectors, ported LS6 oil pump, 160 degree thermostat, LS7 clutch & flywheel, Blackwing filter, ported/descreened air flow sensor, Cold Air Screens, Corsa Touring Exhast, Drilled & Slotted Bendix rotors, Black calipers, BPP short shifter, Ipod2Car interface."
"Patriot heads & cam, LS6 Intake & injectors, ported LS6 oil pump, 160 degree thermostat, LS7 clutch & flywheel, Blackwing filter, ported/descreened air flow sensor, Cold Air Screens, Corsa Touring Exhast, Drilled & Slotted Bendix rotors, Black calipers, BPP short shifter, Ipod2Car interface."
#10
Resident moron
#12
Safety Car
350(BHP for stock LS1) x ( 0.82 for manual tranny) or 0.88 for auto trans
so 350 x 0.82 = 287rwhp for an auto
and350 x 0.88 = 308rwhp for a manual
478 x 0.88 = 420rwhp for your car so 478 brake horsepower is what you have.. This is not an exact science but pretty dang close
Last edited by David426; 07-18-2011 at 03:48 PM.
#13
Race Director
Stock '02 ZO6 is factory rated @ 405 HP, and most dyno about 345-360 RWHP corrected SAE, which is about a %13 drop. After I finished with my NA build, it did 483 RWHP corrected, and then the clutch gave up. I got some custom badges from this guy in Poland; set of 3 for $25 included shipping! They were ordered by some guy who never bought them, and they said 525HP. I figured this was pretty conservative, and I couldn't pass up the price. However, the quality wasn't up to the standards of that Justin guy that does them in the USA, for a lot more money. Now, of course, they're not even close, and they're coming off when I finally remove my BSMs.
#14
Drifting
wait what? Im confused. I was just commenting off of yours from earlier and agreeing with you in saying if it was an LS1 it wouldnt be that high at all. Infact thinking about it and knowing some of my old buddies cars....that would have to be one hell of a monster cam to make 420rwhp w/o heads.... or one happy dyno.
#16
#17
Team Owner
#18
Team Owner
Basicly the way to go is engine HP minus 12-15% = RWHP.
#19
Racer
Here's my $0.02 on the subject: my engine made 602 hp on an engine dyno, and then made 519 rwhp on a chassis dyno. So, 519/602= 86%, or a 14% loss through my drivetrain. I have always used the thumb rule of a 15% loss through a manual transmission, and my dyno numbers seem to support it...
#20
Safety Car
Rear wheel horsepower is at best a ballpark number and is only relative to the dyno being used. Hot Rod did a write up not so long ago and compared several RW dyno's on the same car they got wildly different values varying as much as +/- 100 hp.
Basicly the way to go is engine HP minus 12-15% = RWHP.
Basicly the way to go is engine HP minus 12-15% = RWHP.
Last edited by David426; 07-21-2011 at 01:31 PM.