Contour Enthusiasts Group Archives Forums General General 2000 SVT Contours 200hp/205hp/210hp?

XXXXXCCCCELLLLLLLENT!

Ill put down my fist now, no war will be going on here, 2000's lets go home

Hehehe

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Jay (Intersection Killer)
00 'BARTENDER! A Black&Tan' SVT Contour

Home Sweet Home
www.SVTperformance.com

Here's my question. Does the SVT loose a ton of hp and tq to the wheels? I've seen about 8 SVTs dynoed at MC Racing in Kansas City. I believe I saw a variety of 98-00 models get dyoned and every single one of them had mod to some degree. The lowest dynoed at 150 fwhp (he had 17" Momo Racer wheels which are EXTREMELY heavy) and the highest dynoed SVT made 166 fwhp (OUTLAWD, Robbie). So if this is the case assuming an intake makes about 5 fwhp with the hood (210hp), the SVT is loosing approximately 20% through drivetrain? I believe the torque to the wheels was in the 150-155 ft/lb range.
Does anyone here think the SVT might be overrated in power a little? It's pretty rare that a manual looses 20%, especially in FWD. The reason I say this is because my Maxima made 176fwhp (decent) and 194fwtq (really good) on the same day which equals about 205hp and 225 tq at the fly assuming 15% loss (stock is rated at 190hp/205tq). My hp numbers are pretty consistent with what others have gotten with the same mods. My tq numbers are about 5% higher than the others though.

What do you guys think? Maybe our dyno shop has slightly lower numbers than some others?


Dave

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black 96 Maxima SE
14.73@94mph, 2.25 60'
Mods? 175 fwhp/193 fwtq

Over about one year on this forum, the range Ive seen for most stock SVTs is about 160-166 FWHP and about 145-150 FWTourque. Ive seen about 3 dyno at 150-159 and 2 over 170 stock. Not sure how much is dyno/operator variation vs motor variation. So, say a median number is about 163HP & 147 Tourque. If you use a standard conversion of 18% then this works out to 196.3 HP (rated at 195-200 depending on year) and 177.1lb/ft (rated at 169). So, I would say not overrated unless the conversion factor is wrong. I have read that FWD/transverse engine setups are a bit less efficient than longitudinal engine setups.

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Dan
99SVT - Tropic Green
#554/2760
Stock - except minor intake, exhaust, & motor mount enhancements

I'm really curious how wheel torque is measured on a dyno like that. Basically, torque is multiplied through the gear ratios, while HP is lost. There may be some torque loss through deflection of shafts, etc, but still gearing multiplies torque.

The torque sent to wheels would be the same as torque on the axle, and that is equal to engine torque X trans ratio X final drive ratio. If a car make 200 lb-ft, has a 3.5:1 1st gear ratio, and a 4:1 final drive ratio, that car puts 2800 lb-ft to the axle. I've seen instrumented test data (torque meters on the wheels), I can verify this what happens.

I know dyno runs are usually made in what ever gear is closest to 1:1, but still, the dyno operator would have to know all the appropriate gear ratios (do they?) to accurately calculate what the engine is putting out.

Am I missing something???

Set parameters are entered into the dyno for calculations (gear ratio - final drive - etc)

Once the dyno operator get the wheels moving, he puts the car in a set gear (normal 4th at a 1:1 ratio {Contour is 1.03:1}) and accelerates from a set rpm to redline. (I.E. 3000rpm to 7000rpm)

You could run in any gear technically, but the results would be significantly more skewed (larger error margin) the further you get from a true 1:1 ratio. (the dyno's computer is doing more calculating verses using it's own sensor data)

To reverse a 18% loss you would dived by .82 (or add about 22%)

(18% loss) 163HP = 198.9HP
(15% loss) 147TQ = 173TQ

The estimates I have on the MTX is roughly 18% HP and 15% TQ

Either way though.
What I really think is under-rated is the torque of the standard Duratech. Lists at 165TQ at the crank and they normally beat the SVT's at the dyno...

Thanks, I had wondered how accurate those were, and how they accounted for the gearing. At work, we look at torque only as the ring gear sees it - the full multiplied value using 1st gear - since that's the worst case load for the diff, and that's what I was used to seeing...

[This message has been edited by Rick @ Torsen (edited April 27, 2001).]

in reply to the ins thing... my ins company (arabella) rates the svt contour 15 of 15 in the sportiness and high risk categories. pretty sucky huh?

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99 SVT #2336
Silver Frost/Midnight Blue.
Leda Coilovers.
K&N Drop-In Air Filter.
Quaife ATB Differential.
B&M Short Shifter.
PIAA Superwhite 9005 + 9006.
Dyno Proven: 176hp/162lbft.

Mine (Aetna) says it's just a family sedan. Change carriers, soon.

Farmers has my SVT lower than my wife's Z-ATX: she totalled the 95 13 months ago .. for them, a Contour is a Contour.