convert rear wheel hp to flywheel hp

**94REDGT** · 08-29-2011, 12:28 PM

does anyone know how to convert rhp to flywheel hp thanks

**White5.0** · 08-29-2011, 12:36 PM

just a quick internet search brought up this:

http://www.mk5cortinaestate.co.uk/calculator4.php

There's also various forum threads with people asking the same question. A lot of variables come into play though when trying to figure that out so you can never get a 100% correct answer.

**Balaska347** · 08-29-2011, 01:07 PM

If its a manual your looking at about 15% and an auto is about 17%-20%

**PaxtonShelby** · 08-29-2011, 01:10 PM

Originally Posted by Balaska347

If its a manual your looking at about 15% and an auto is about 17%-20%

x 2

Typically you lose about 20% thru an auto and 15% thru a manual

assuming you have a manual...

FWHP x .85 = RWHP

**Mark Aubele** · 08-29-2011, 01:13 PM

There is no accurate way to do this, too many variables. It is also pointless, except for bragging on the net, take it to the track.

**Martin0660** · 08-29-2011, 01:16 PM

The type of dyno, and what they have messed with (corrections) also come into play here ... A dyno is a tool, strap it down and make a pull, make changes and strap it down to the same one again and pull ... if the second run makes more power the change worked ;)

**GOT SVT** · 08-29-2011, 01:20 PM

when you going to update that signature????

**94REDGT** · 08-29-2011, 02:21 PM

Originally Posted by GOT SVT

when you going to update that signature????

Soon The car is unreal The power is beyond what I thought. I have the dyno and its at 627 I was just wondering what the actual flywheel was I finished detailing it yesterday Looks Great Ill get pics up soon i always have trouble getting them uploaded here

**Mark Aubele** · 08-29-2011, 02:25 PM

Originally Posted by 94REDGT

...dyno and its at 627 I was just wondering what the actual flywheel was...

A lot. WELL over 700.

More info on combo?

**03 OW SVT** · 08-29-2011, 02:28 PM

You should take it to the track. It will run 10's. I've seen it do it:)

**03 OW SVT** · 08-29-2011, 02:30 PM

Originally Posted by Mark Aubele

A lot. WELL over 700.

More info on combo?

Whipple and many other supporting mods.

**94REDGT** · 08-29-2011, 02:31 PM

Originally Posted by 2011GB/CS

You should take it to the track. It will run 10's. I've seen it do it:)

i think he has the slip still 10.90's hes going to give me all the papers he has so I can keep a book on the car from beginning to present. You know me It will be a garage queen for sure

**03 OW SVT** · 08-29-2011, 02:34 PM

I know as does Mark and everyone else that knows the car and you, that it went to a good home. But you still need to run the heck out of it.

**94REDGT** · 08-29-2011, 02:44 PM

Originally Posted by 2011GB/CS

I know as does Mark and everyone else that knows the car and you, that it went to a good home. But you still need to run the heck out of it.

I Know But i got to get use to it first Going from the 94 gt to this is an unbelievable difference like from a yugo to a guided missle

**03 OW SVT** · 08-29-2011, 02:52 PM

Originally Posted by 94REDGT

I Know But i got to get use to it first Going from the 94 gt to this is an unbelievable difference like from a yugo to a guided missle

LOL....or a Smart Car to a Smart Car with a Busa motor in it.

**Troll** · 08-29-2011, 02:53 PM

I don't believe the 'ole 15% for manuals and 20% for autos BS. We are all so used to dealing with cars that make 300hp flywheel and 240-250 rearwheel hp, that that 15/20% nonsense just happened to work out. I have nothing to support this, but I believe most cars lose about 40-50hp through the drivetrain. That's also why everybody goes on and on and on about the new 5.0 being underrated at 412 flywheel when they're putting down 370 to the wheels. No, it's not underrated, it just lost 42hp through the drivetrain. the old 15% calculation would put you at 350 rwhp. When the hp goes up, and in some cases goes up considerably, do you guys still believe you lose 15%??? does a 1,000hp engine generate only 850hp on the dyno? does it really lose 150hp through the drivetrain?

**94REDGT** · 08-29-2011, 03:07 PM

ok I changed the pics but I am having one hell of a time changing the avitar Uisng photobucket can someone give me some sort of direction to do this I tried jsut about every combo there and cannot get it to take thanks

**shockstang** · 08-30-2011, 12:42 AM

Originally Posted by Troll

I don't believe the 'ole 15% for manuals and 20% for autos BS. We are all so used to dealing with cars that make 300hp flywheel and 240-250 rearwheel hp, that that 15/20% nonsense just happened to work out. I have nothing to support this, but I believe most cars lose about 40-50hp through the drivetrain. That's also why everybody goes on and on and on about the new 5.0 being underrated at 412 flywheel when they're putting down 370 to the wheels. No, it's not underrated, it just lost 42hp through the drivetrain. the old 15% calculation would put you at 350 rwhp. When the hp goes up, and in some cases goes up considerably, do you guys still believe you lose 15%??? does a 1,000hp engine generate only 850hp on the dyno? does it really lose 150hp through the drivetrain?

I agree. It only makes sense that the horsepower/torque required to turn a drivetrain does not change as power levels increase or decrease.

**biminiLX** · 08-30-2011, 01:04 PM

A straight percentage is not necessarily true and the actual components of the drivetrain determine how much loss (ex--auto vs. manual and TKO/9" vs. T5/8.8") however, the percentages of loss DO increase with higher power due to heat and friction, so its not just based on the drivetrain behind the engine.
-J