350 RWHP would it equal low 12s, depending on the driver of course?
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Joined: Jan 2002
Posts: 274
From: Raleigh, NC
350 RWHP would it equal low 12s, depending on the driver of course?
350 RWHP...
Would it equal low 12s, depending on the driver of course?
And...does anyone have a good rule of thumb for measuring actual motor HP vs. RWHP...
Example RWHP = 350....actual engine HP = 350 + X% of 350
Just my question of the hour...
TDOG
Would it equal low 12s, depending on the driver of course?
And...does anyone have a good rule of thumb for measuring actual motor HP vs. RWHP...
Example RWHP = 350....actual engine HP = 350 + X% of 350
Just my question of the hour...
TDOG
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Joined: Oct 2000
Posts: 1,997
From: Reading, PA
Re: 350 RWHP would it equal low 12s, depending on the driver of course?
Originally posted by TDog
350 RWHP...
Would it equal low 12s, depending on the driver of course?
And...does anyone have a good rule of thumb for measuring actual motor HP vs. RWHP...
Example RWHP = 350....actual engine HP = 350 + X% of 350
Just my question of the hour...
TDOG
350 RWHP...
Would it equal low 12s, depending on the driver of course?
And...does anyone have a good rule of thumb for measuring actual motor HP vs. RWHP...
Example RWHP = 350....actual engine HP = 350 + X% of 350
Just my question of the hour...
TDOG
M6 cars with a stock rear have an approximately 15% drivetrain loss. So an M6 car dynoing 300rwhp = 345 at motor, or
RWHP x 1.15 = HP at motor. A4's lose a little more, around 17-20%
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Joined: Oct 2002
Posts: 49
From: Swansea,IL.
350 rwh
My goal with 300rwh is to run 12.9. This is with suspension mods,Nittos,stall(2800),headers, all bolt ons.Also with bulletproof tranny(can handle up to 425rwh).May take me another year though. In no hurry1Pickerman
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Posts: 1,090
rwhp has not as much effect on the ET as does TRACTION, LAUNCH, and WEIGHT.
ever wonder why autos with the same mods and manuals run about .7-1.0 faster? look at ken for example, 230/236 heads, stall, and he ran like a 11.2 i think. then take beast96z same mods except a manual and he ran a 11.98
my 2 cents
ever wonder why autos with the same mods and manuals run about .7-1.0 faster? look at ken for example, 230/236 heads, stall, and he ran like a 11.2 i think. then take beast96z same mods except a manual and he ran a 11.98
my 2 cents
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Joined: Aug 2002
Posts: 126
From: Sweden
Gregg 97Z:
Just want to correct you a little bit there....you can't calculate a 15% loss like that...
If you have 345 on motor and take 15% off you have 85% left => 345*0.85=293.25hp at the wheels 51.75hp in loss that is.
If you want to calculate backwards it becomes
Rwhp/(1-(%loss/100))= Motor hp
So if you dyno 300 rwhp and calculate with a 15% drivetrain loss the motor hp becomes
300/(1-(15/100)) = 352.9 Motor hp
...
Just want to correct you a little bit there....you can't calculate a 15% loss like that...
If you have 345 on motor and take 15% off you have 85% left => 345*0.85=293.25hp at the wheels 51.75hp in loss that is.
If you want to calculate backwards it becomes
Rwhp/(1-(%loss/100))= Motor hp
So if you dyno 300 rwhp and calculate with a 15% drivetrain loss the motor hp becomes
300/(1-(15/100)) = 352.9 Motor hp
...
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Joined: Sep 2002
Posts: 397
From: Upstate SC
Well, my sig sums up my mods and my best ET so far. BONE STOCK 160K mile suspension!!! I need subframes!
I'm guessing I have 290RWHP...TOPS!! And, I agree that HP isn't the big determining factor of ETs...traction, launch and driver...oh, and weight. My car is LIIIIIIIGHT!
I'm guessing I have 290RWHP...TOPS!! And, I agree that HP isn't the big determining factor of ETs...traction, launch and driver...oh, and weight. My car is LIIIIIIIGHT!
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Joined: Oct 2000
Posts: 1,997
From: Reading, PA
Originally posted by Dan_gearhead
Gregg 97Z:
Just want to correct you a little bit there....you can't calculate a 15% loss like that...
...
Gregg 97Z:
Just want to correct you a little bit there....you can't calculate a 15% loss like that...
...
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Joined: Mar 2003
Posts: 526
From: Sacramento, CA
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From: North Canton, OH
That calc will give you and ideal, but I figure that my car in raceweight weighs 3600 lbs. My car dynoed 359 rwhp, 450 rwtq. That calc says I have to make 438 @ the wheels to run those times in my sig.
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Joined: Sep 2002
Posts: 397
From: Upstate SC
Originally posted by CANTONRACER
That calc will give you and ideal, but I figure that my car in raceweight weighs 3600 lbs. My car dynoed 359 rwhp, 450 rwtq. That calc says I have to make 438 @ the wheels to run those times in my sig.
That calc will give you and ideal, but I figure that my car in raceweight weighs 3600 lbs. My car dynoed 359 rwhp, 450 rwtq. That calc says I have to make 438 @ the wheels to run those times in my sig.
Me: 3250#s and 290RWHP was my guess...got close to that 12.98 I ran. The MPH was lower than what I obtained though.
Again...just guesses.
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Joined: Mar 2003
Posts: 526
From: Sacramento, CA
Originally posted by CANTONRACER
That calc will give you and ideal, but I figure that my car in raceweight weighs 3600 lbs. My car dynoed 359 rwhp, 450 rwtq. That calc says I have to make 438 @ the wheels to run those times in my sig.
That calc will give you and ideal, but I figure that my car in raceweight weighs 3600 lbs. My car dynoed 359 rwhp, 450 rwtq. That calc says I have to make 438 @ the wheels to run those times in my sig.