bone stock C5 6SPD dyno results
Thread Starter
Racer
Joined: May 2003
Posts: 392
Likes: 0
From: Austin TX
bone stock C5 6SPD dyno results
Hello,
I have read articles about GM and how they rate the HP of the stock Corvettes at the low end of the spectrum, to assure that any Vette that rolls off the assembly line meets the claims due to the variability from motor to motor. Today I took my 2003 C5 6SPD and had it dyno'd, just to see where I start before tinkering with it -- I got 306.6RWHP/326.3ftlbs. Is this average, good, poor?? Does anyone know?? Just curious.
Thanks,
--dc.
I have read articles about GM and how they rate the HP of the stock Corvettes at the low end of the spectrum, to assure that any Vette that rolls off the assembly line meets the claims due to the variability from motor to motor. Today I took my 2003 C5 6SPD and had it dyno'd, just to see where I start before tinkering with it -- I got 306.6RWHP/326.3ftlbs. Is this average, good, poor?? Does anyone know?? Just curious.
Thanks,
--dc.
Melting Slicks
Joined: Feb 2001
Posts: 2,485
Likes: 0
From: Pembroke Pines Florida
Re: bone stock C5 6SPD dyno results (Ben01C5)
I dynoed stock 304.9 and 324ft lbs. Your numbers are right on the money.
Autos will dyno around 300 or less
[Modified by BRADS C5, 4:16 PM 5/21/2003]
Autos will dyno around 300 or less
[Modified by BRADS C5, 4:16 PM 5/21/2003]
Race Director
Joined: Mar 2001
Posts: 19,974
Likes: 6,773
From: Bonneville Salt Flats
Re: bone stock C5 6SPD dyno results (dmcantrell)
If you take your rear wheel figures times the accepted multiplier of 1.15 to convert from rw to approximate flywheel performance, you'll see you are pretty much right on GM's published performance data for a 6-speed LS-1.
I doubt that this varies significantly from engine to engine, given today's machining methods and computerized engine controls. This isn't the '60's where it was as you suggest. If it were, Ford and Mazda wouldn't have been in such hot water when a couple of their products' performance didn't measure up to what was advertised.
Today, performance is too big a marketing ploy with such vehicles to risk under-reporting power in the market place. Even in the 'ol days it was insurance rates that dictated fudged factory figures more than anything else.
All the best. :yesnod:
I doubt that this varies significantly from engine to engine, given today's machining methods and computerized engine controls. This isn't the '60's where it was as you suggest. If it were, Ford and Mazda wouldn't have been in such hot water when a couple of their products' performance didn't measure up to what was advertised.
Today, performance is too big a marketing ploy with such vehicles to risk under-reporting power in the market place. Even in the 'ol days it was insurance rates that dictated fudged factory figures more than anything else.
All the best. :yesnod:
Le Mans Master
Joined: Mar 2002
Posts: 6,885
Likes: 2
From: Corpus Christi TX
Re: bone stock C5 6SPD dyno results (dmcantrell)
multiplying by (1 + your driveline loss %) is not as accurate as dividing by (1 - your driveline loss %) when working with a RW number.
IE: 306 X 1.15 = 351.9
VS
306 / .85 = 360
This will yield the most accurate flywheel number.
IE: 306 X 1.15 = 351.9
VS
306 / .85 = 360
This will yield the most accurate flywheel number.
Race Director
Joined: Apr 2003
Posts: 19,353
Likes: 654
From: Tampa, Florida
Re: bone stock C5 6SPD dyno results (omattitude)
It looks like there is a 12% loss with MN6 cars. 350HP less 12% is 308 which seems to be about the average RWHP you guys are getting. Using a 15% loss for manual and a 20% loss for autos is an old wives tales/rule of thumb. The correct way to determine loss is to do the math backwards. Every car has a different % of loss depending on drivetrain frictional losses. For the vette it seems like 12% for MN6 and 14% for A4's.
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Drifting
Joined: Dec 2002
Posts: 1,472
Likes: 1
From: Reynoldsburg oh
Re: bone stock C5 6SPD dyno results (BRADS C5)
I dynoed stock 304.9 and 324ft lbs. Your numbers are right on the money.
Autos will dyno around 300 or less
[Modified by BRADS C5, 4:16 PM 5/21/2003]
Autos will dyno around 300 or less
[Modified by BRADS C5, 4:16 PM 5/21/2003]
Got a A4 here and she dynoed stock at 302rwhp 320rwtq :yesnod:
Melting Slicks
Joined: Oct 2002
Posts: 2,200
Likes: 0
Re: bone stock C5 6SPD dyno results (Kwiksilver01)
Two weeks ago at the vet show in Madison my car ran .
315rwhp / 335rwtq
315rwhp / 335rwtq
:cheers:
Drifting
Joined: May 2000
Posts: 1,413
Likes: 0
From: Wildwood MO
Re: bone stock C5 6SPD dyno results (SideStep)
Check my sig for my numbers with only a Vortex & Corsa Indy. I can't wait to get my new G5X2 Cam, UD Pulley, LS6 intake and FLP's installed. I'm hoping for 420+ after a custom dyno tune.
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Re: bone stock C5 6SPD dyno results (dmcantrell)
These numbers can be deceiving. There are different types of Dynos and correction factors. STD-corrected numbers are normally higher than SAE-corrected, so don't assume everyone's car was tested using SAE correction. My car was tested on a dyno that used STD correction and I'll bet those who posted similar numbers did the same.
Team Owner
Joined: May 2000
Posts: 25,346
Likes: 222
From: Frisco, TX
Re: bone stock C5 6SPD dyno results (dmcantrell)
I think you're right in the bell curve. Mine, stock and with a Vortex rammer air box, and 3.73 gears, dyno'd at 314 rwhp. I don't recall the torque, but I think it was lower than yours. :seeya
Le Mans Master
Joined: Aug 2002
Posts: 8,357
Likes: 832
From: Naples Florida
Re: bone stock C5 6SPD dyno results (dmcantrell)
Put some miles on that new Vette of yours and break her in more. I am betting that you will get even more horses once she is broken in. :)
Former Vendor
Joined: Mar 2003
Posts: 18,666
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From: Tampa FL
St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15
Re: bone stock C5 6SPD dyno results (MTWallet)
Check my sig for my numbers with only a Vortex & Corsa Indy. I can't wait to get my new G5X2 Cam, UD Pulley, LS6 intake and FLP's installed. I'm hoping for 420+ after a custom dyno tune.