Will someone please explain how you get AWHP numbers? - 3000GT/Stealth International Message Center

Jackal1337 · 05-04-2008, 10:11 PM

I know that all wheel horsepower is measured differently than rear wheel horsepower...but exactly how is that number calculated? Is the AWHP number just the measure of how much HP is in the front or rear wheels? Then adding them up would give you the equivalent number for RWHP????

dudewutup · 05-04-2008, 10:13 PM

the number is obtained when the car is dynoed it is te mesurment of all the wheels horse power

VRoom4 · 05-04-2008, 10:15 PM

Quote:

Originally Posted by dudewutup

the number is obtained when the car is dynoed it is te mesurment of all hte wheels horse power

Lol. My next question to you sir is...

How is voltage determined?

Jackal1337 · 05-04-2008, 10:18 PM

haha no kidding.....kinda already knew that, i want to know that important question...HOW!?!?

dudewutup · 05-04-2008, 10:23 PM

that goes beyond my experance
but for the voltage i recomend one of theese
Howstuffworks "Voltage Tester"
lol sorry i was no help

donniekak · 05-04-2008, 10:48 PM

Horsepower is calculated from the torque applied to the dyno rollers.
Torque in ftlbs is multiplied by rpms and then divided by 5252 to equal horsepower. Look at any dyno chart and torque and horsepower are always equal at 5252 rpms. The difference in wheel speed and engine speed is also factored out.

Jackal1337 · 05-04-2008, 11:18 PM

Anyone know what % the drivetrain loss for a VR-4 is?

axispiral · 05-04-2008, 11:27 PM

Quote:

Originally Posted by Jackal1337

Anyone know what % the drivetrain loss for a VR-4 is?

i usually hear about 25%, so i'd say 20-30% would be a good guess

Jackal1337 · 05-05-2008, 12:19 AM

So on a dyno, a carbon fiber drive shaft should literally give you more horsepower because it makes it more efficient? Wonder else could be lightened up fairly easy?

axispiral · 05-05-2008, 12:56 AM

lets say ur car has 400 crank hp, which is the horsepower measured at the crank, before the drive train loss, which is really hard to measure. Now, after about 25% loss you put down probs 300AWHP on the dyno. more or less. now say you put in a CFDS or an aluminum flywheel, lighter rims, they will not increase your crank HP, it will still be 400, but you may raise your dyno numbers a little bit, dropping the % loss with each upgrade. so you after all the lighter upgrades, you may dyno at 320AWHP-ish (not sure on exact numbers). make sense? those upgrades wont give you more hp at the crank, but more to the wheels.

05-04-2008, 10:11 PM	#1 (permalink)
Jackal1337 This is my BOOM stick!!! Join Date: Nov 2002 Location: St. Louis Drives: 94 3000GT VR-4 Trader Rating: (1)	Will someone please explain how you get AWHP numbers? I know that all wheel horsepower is measured differently than rear wheel horsepower...but exactly how is that number calculated? Is the AWHP number just the measure of how much HP is in the front or rear wheels? Then adding them up would give you the equivalent number for RWHP???? __________________ "Granny shiftin, not double clutchin like ya should." Words of wisdom from Vin Diesel ======================================================== 1994 Mitusbishi 3000GT VR4 DR-500s, Blitz DSBC EBC, Greddy Type-S BOV, Denso fuel pump, Stillen Downpipe, 3SX Stage II Clutch, Fidanza Aluminum Flywheel, Stillen K&N air filter, Greddy Boost and EGT guages, DN performance Y-pipe, Compustar 2WSS-AS Security System, Carbon Fiber Pit Fighter Hood, Slotted Carbotech Rotors, Denso Irridium Spark Plugs Resonant Engineering XXX sub 2000 watt Audiobahn amp

05-04-2008, 10:13 PM	#2 (permalink)
dudewutup is almost out the shop Join Date: May 2007 Location: mcbee, sc Drives: 95 base Trader Rating: (4)	Re: Will someone please explain how you get AWHP numbers? the number is obtained when the car is dynoed it is te mesurment of all the wheels horse power __________________ "shure i tell stories and lie, you hate me. big news so did harry potter and he is your favorite writer." soon to come true dual exhaust I'm bringing this N/A to power Last edited by dudewutup : 05-04-2008 at 10:19 PM. Reason: typ :D

05-04-2008, 10:18 PM	#4 (permalink)
Jackal1337 This is my BOOM stick!!! Join Date: Nov 2002 Location: St. Louis Drives: 94 3000GT VR-4 Trader Rating: (1)	Re: Will someone please explain how you get AWHP numbers? haha no kidding.....kinda already knew that, i want to know that important question...HOW!?!?

05-04-2008, 10:23 PM	#5 (permalink)
dudewutup is almost out the shop Join Date: May 2007 Location: mcbee, sc Drives: 95 base Trader Rating: (4)	Re: Will someone please explain how you get AWHP numbers? that goes beyond my experance but for the voltage i recomend one of theese Howstuffworks "Voltage Tester" lol sorry i was no help

05-04-2008, 10:48 PM	#6 (permalink)
donniekak Forum Member Join Date: Feb 2008 Location: surprise az Drives: 92rt/tt Trader Rating: (0)	Re: Will someone please explain how you get AWHP numbers? Horsepower is calculated from the torque applied to the dyno rollers. Torque in ftlbs is multiplied by rpms and then divided by 5252 to equal horsepower. Look at any dyno chart and torque and horsepower are always equal at 5252 rpms. The difference in wheel speed and engine speed is also factored out.

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05-04-2008, 11:18 PM	#7 (permalink)
Jackal1337 This is my BOOM stick!!! Join Date: Nov 2002 Location: St. Louis Drives: 94 3000GT VR-4 Trader Rating: (1)	Re: Will someone please explain how you get AWHP numbers? Anyone know what % the drivetrain loss for a VR-4 is?

05-05-2008, 12:19 AM	#9 (permalink)
Jackal1337 This is my BOOM stick!!! Join Date: Nov 2002 Location: St. Louis Drives: 94 3000GT VR-4 Trader Rating: (1)	Re: Will someone please explain how you get AWHP numbers? So on a dyno, a carbon fiber drive shaft should literally give you more horsepower because it makes it more efficient? Wonder else could be lightened up fairly easy?

05-05-2008, 12:56 AM	#10 (permalink)
axispiral Forum Member Join Date: Nov 2007 Location: Honolulu, Hawaii Drives: '92 3000gt VR-4 Trader Rating: (0)	Re: Will someone please explain how you get AWHP numbers? lets say ur car has 400 crank hp, which is the horsepower measured at the crank, before the drive train loss, which is really hard to measure. Now, after about 25% loss you put down probs 300AWHP on the dyno. more or less. now say you put in a CFDS or an aluminum flywheel, lighter rims, they will not increase your crank HP, it will still be 400, but you may raise your dyno numbers a little bit, dropping the % loss with each upgrade. so you after all the lighter upgrades, you may dyno at 320AWHP-ish (not sure on exact numbers). make sense? those upgrades wont give you more hp at the crank, but more to the wheels.