Torque Conversion

wildwoman · 07-10-2012, 11:56 AM

Ok kids, I posted this on FB and got no response so I am trying it again here.
I recently had to have my engine rebuilt, no compression, well it only has 105k miles on it. My mechanic did a little tweaking here and there, had it balanced, added a chip, smaller pulley, yada yada yada.
My dyno numbers are in torque and it seems they weren't interested in the conversion to HP as I am. Both my mechanic and his assistant seem to think you add 15% to the torque number. So here are my numbers: 425.52 rw and 451.13 max torque.
Any thoughts on this, because if the 15% is true i would have about 488 rwhp and 518 hp.
Thanks in advance!
Debbie

**cobrabitn** · 07-10-2012, 09:21 PM

It sounds to me that you are getting flywheel hp and and rear wheel hp numbers mixed up with torque numbers. I have never heard about torque and hp having a number attached to it like flywheel and rearwheel hp. If you have 500 hp at the flywheel, you would have about 425 rear wheel hp or a 15% drag from the drivetrain. This is mostly true for automatics so your manual transmission may let you be in the 440 rwhp range. Not sure what your mechanic is talking about and why he would just measure torque and not hp.

FLEA03 · 07-14-2012, 11:12 PM

425 rear wheel HP is about right with a tune, pulley and CAI.

07-10-2012, 11:56 AM	#1
wildwoman SCMC Member Join Date: Oct 2001 Location: Coarsegold, CA Posts: 39	Torque Conversion Ok kids, I posted this on FB and got no response so I am trying it again here. I recently had to have my engine rebuilt, no compression, well it only has 105k miles on it. My mechanic did a little tweaking here and there, had it balanced, added a chip, smaller pulley, yada yada yada. My dyno numbers are in torque and it seems they weren't interested in the conversion to HP as I am. Both my mechanic and his assistant seem to think you add 15% to the torque number. So here are my numbers: 425.52 rw and 451.13 max torque. Any thoughts on this, because if the 15% is true i would have about 488 rwhp and 518 hp. Thanks in advance! Debbie __________________ Debbie Manley '04 Mystichrome #348 K & N CAI, Magnaflows 400 RWHP Sunny So Cali

07-10-2012, 09:21 PM	#2
cobrabitn Dr Jekyll on the street, Mr Hyde on the track Join Date: Jun 2001 Location: Rock Hill SC Posts: 14,649	It sounds to me that you are getting flywheel hp and and rear wheel hp numbers mixed up with torque numbers. I have never heard about torque and hp having a number attached to it like flywheel and rearwheel hp. If you have 500 hp at the flywheel, you would have about 425 rear wheel hp or a 15% drag from the drivetrain. This is mostly true for automatics so your manual transmission may let you be in the 440 rwhp range. Not sure what your mechanic is talking about and why he would just measure torque and not hp. __________________ Cobrabitn 2016 Ruby Red Metallic with Caribou accent F-350 Crew Cab Stump Puller! 6.7 Diesel Automatic with Chrome Package, Off Road Package, 3.55 Locking axles, and Ultimate Lariat Interior Trim Package! 2017 Shelby GT350 Coupe - track car! Mods: JLT True Cold Air oil catch can 2009 Vista Blue Shelby GT 500 Coupe - Garage Queen Tinted Windows JLT True Cold Air Kit Pro-Dyno Tune 526 rwhp - 511 rwtq 1994 Rio Red Indy Pace Car #22 "Runabout" Snake in the grill MGW shift knob 1996 SVT Cobra Wheels 1969 New Lime Mustang Mach 1 Sportsroof - Second owner - bone stock with shaker. One SVT Cobra, one Shelby GT500, one 69 mach 1, and a Shelby GT350 is better than nothing! Custom Data Plates for your Mustang or Ford! Buy "Cool Merchandise" at Data Plates Plus www.dataplatesplus.com See my MSR Video here!

07-14-2012, 11:12 PM	#3
FLEA03 SCMC Member Join Date: May 2011 Location: Fall Branch, TN Posts: 23	425 rear wheel HP is about right with a tune, pulley and CAI. __________________ ___________________________________ 2003 Cobra 4.6 4V 1993 LX Weekend Oval Track Racer 2.3 2013 F-250 6.7 1996 Cobra - Track car 4.6 4V 1991 LX - Drag Car 351W

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