convert rear wheel hp to flywheel hp

**94REDGT** · 08-29-2011, 11:28 AM

does anyone know how to convert rhp to flywheel hp thanks

**White5.0** · 08-29-2011, 11:36 AM

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, 12:07 PM

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

**PaxtonShelby** · 08-29-2011, 12:10 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, 12:13 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, 12:16 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, 12:20 PM

when you going to update that signature????

**94REDGT** · 08-29-2011, 01:21 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, 01:25 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, 01:30 PM

Originally Posted by Mark Aubele

A lot. WELL over 700.

More info on combo?

Whipple and many other supporting mods.

**03 OW SVT** · 08-29-2011, 01:28 PM

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

**94REDGT** · 08-29-2011, 01:31 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

**biminiLX** · 08-30-2011, 12:04 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

**PaxtonShelby** · 08-30-2011, 01:20 PM

The 15% & 20% methodology is just a generalization. Not intended to be exact - just ballpark.

**383taman** · 08-30-2011, 04:08 PM

I dont know but if someone figures it out let me know cause my motor made 502/523 on the engine dyno. After it was in the car i put it on a mustang dyno for some touch up tuning and it only made 268/288 on it know i didnt lose that much. HAHAHA car ran mid 11s. All i could figure is the loose converter and spun on the mustang dyno. IDK didnt care was there for tuning.