RWHP Conversion

jbuzz · 10-21-2010, 06:29 PM

Hey guys, Ive been doing some research on rear wheel horse power as it relates to flywheel horse power.

I know typically loss is averaged around 25% on most cars while this percentage can vary based on make and model.

Ive read WRX's lose appx 26% and 350z's are around 24%.

Using these numbers (25% loss) my dyno @ 314 rwhp would convert to 419 hp at the flywheel.

Anyone have some input on this subject?

christian370z · 10-21-2010, 06:43 PM

25% loss is far too high, it is around 20% for a 6MT 370z. I am not sure if it has been officially measured but I can assure you that unless you are running a forced induction setup, there is no way you are putting out 420hp at the crank. Unless someone cracks VVEL, 400hp at the crank is not possible even with full bolt-ons.

jbuzz · 10-21-2010, 06:56 PM

20% would be 392.5, still not bad.

christian370z · 10-22-2010, 10:08 PM

Quote:

Originally Posted by jbuzz

20% would be 392.5, still not bad.

At 20% drivetrain loss, 314rwhp equates to 377 crank horsepower. That is pretty good considering with only bolt ons you have gone from 332 to 377hp.

daisuke149 · 10-22-2010, 10:12 PM

Quote:

Originally Posted by christian370z

At 20% drivetrain loss, 314rwhp equates to 377 crank horsepower. That is pretty good considering with only bolt ons you have gone from 332 to 377hp.

392 sounds more right.

adding 20% and removing 20% = different numbers.

Staples · 10-22-2010, 11:04 PM

On a dynojet there's a 17% drivetrain loss. For a Mustang / Dyno Dynamics it could be up to 19-20%

christian370z · 10-23-2010, 12:24 AM

Quote:

Originally Posted by daisuke149

392 sounds more right.

adding 20% and removing 20% = different numbers.

My apologies, my brain is obviously not working after midterms week!

jbuzz · 10-23-2010, 09:13 AM

314 / .8 = 392.5

IDZRVIT · 10-23-2010, 12:32 PM

Quote:

Originally Posted by Staples

On a dynojet there's a 17% drivetrain loss. For a Mustang / Dyno Dynamics it could be up to 19-20%

That's the difference in dynamometers - not the drivetrain.

10-21-2010, 06:29 PM	#1 (permalink)
jbuzz Base Member Join Date: Sep 2009 Location: North NJ Posts: 48 Drives: 09 370z MT6 Touring Rep Power: 15	RWHP Conversion Hey guys, Ive been doing some research on rear wheel horse power as it relates to flywheel horse power. I know typically loss is averaged around 25% on most cars while this percentage can vary based on make and model. Ive read WRX's lose appx 26% and 350z's are around 24%. Using these numbers (25% loss) my dyno @ 314 rwhp would convert to 419 hp at the flywheel. Anyone have some input on this subject?

10-21-2010, 06:43 PM	#2 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 431	25% loss is far too high, it is around 20% for a 6MT 370z. I am not sure if it has been officially measured but I can assure you that unless you are running a forced induction setup, there is no way you are putting out 420hp at the crank. Unless someone cracks VVEL, 400hp at the crank is not possible even with full bolt-ons. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

10-22-2010, 11:04 PM	#6 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 15	On a dynojet there's a 17% drivetrain loss. For a Mustang / Dyno Dynamics it could be up to 19-20% __________________ '08 Infiniti G37s - Forced Induction Fed

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10-21-2010, 06:56 PM	#3 (permalink)
jbuzz Base Member Join Date: Sep 2009 Location: North NJ Posts: 48 Drives: 09 370z MT6 Touring Rep Power: 15	20% would be 392.5, still not bad.

10-23-2010, 09:13 AM	#8 (permalink)
jbuzz Base Member Join Date: Sep 2009 Location: North NJ Posts: 48 Drives: 09 370z MT6 Touring Rep Power: 15	314 / .8 = 392.5