Stock LS3 Dyno Results...boo! :( - Corvette Forum

Go Back   >
Log In 
Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C6 Corvette General Discussion
General C6 Corvette Discussion not covered in Tech Sponsored by
PFYC

Stock LS3 Dyno Results...boo! :(

Reply
 
 
 
Thread Tools Search this Thread
Old 07-17-2013, 12:28 AM   #1
Nosferatu
CF Senior Member
St. Jude Donor '14
Thread Starter
 
Nosferatu's Avatar
 
Member Since: Mar 2013
Location: Ahead of You :)
Posts: 4,086
Thanked 92 Times in 58 Posts
Default Stock LS3 Dyno Results...boo! :(

Well car pulls great and I knew going to a Mustang dyno it was going to be low but 338rwhp (with similar torque...I don't have the sheets in front of me)????

I'm "assuming" it's a 15% loss on those versus a dynojet and that would then put me closer to 390rwhp. Thoughts?

Here's the video...

Nosferatu is offline   Reply With Quote
Old 07-17-2013, 01:16 AM   #2
peter pan
Life Time NCM #2196
Support Corvetteforum!
 
peter pan's Avatar
 
Member Since: Sep 2004
Location: Converse TX
Posts: 75,378
Thanked 4 Times in 4 Posts
Default

Seems a tad on the low side, what does you Vette do stock in the 1/4 is the real test.
peter pan is offline   Reply With Quote
Old 07-17-2013, 01:25 AM   #3
JJC5
CF Senior Member
 
JJC5's Avatar
 
Member Since: Apr 2006
Location: Anaheim Hills, Ca
Posts: 4,254
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Does your Vette run okay? Does it feel like it did when it was new? Use oil? My bet is an out-of-sync dyno; out of calibration. You know that they can play with the numbers on the dyno, right? The '07 LS2 manual trans I used to have did 356 stock.
JJC5 is offline   Reply With Quote
Old 07-17-2013, 01:32 AM   #4
Stavesacre21
CF Senior Member
 
Stavesacre21's Avatar
 
Member Since: Apr 2009
Location: Westerville Ohio
Posts: 1,236
Thanked 53 Times in 33 Posts
Default

I'd rule a good part of the difference out to being a Mustang dyno. It might be a little bit on the low side but I really don't think it's anything to be overly concerned about.
Stavesacre21 is offline   Reply With Quote
Old 07-17-2013, 05:08 AM   #5
Turbo6TA
CF Senior Member
 
Turbo6TA's Avatar
 
Member Since: Mar 2011
Location: Florida
Posts: 4,216
Thanked 50 Times in 37 Posts
Default

A bone stock LS3 / M6 with the NPP (436 HP) will loose about 12% on the DynoJet. So the average SAE Corrected RWHP will be right at 385.

The OP got 338 RWHP on the Mustang dyno. Although the Mustang dyno will show less RWHP than the DynoJet, I think 338 is just too low.

I am betting that there's nothing wrong with the OPs Corvette ... However, the Mustang dyno he was using had an error.
___________________________

From everything I have read, a Mustang dyno will show RWHP numbers about 10% lower than the DynoJet.

If the OP was to get 385 RWHP on the DynoJet, and the Mustang dyno normally gives a 10% lower number, he should be getting about 347 RWHP on the Mustang dyno.
Turbo6TA is offline   Reply With Quote
Old 07-17-2013, 08:26 AM   #6
Larry/car
CF Senior Member
 
Larry/car's Avatar
 
Member Since: May 2008
Location: Manheim Pennsylvania
Posts: 8,712
Thanked 183 Times in 135 Posts
Default

What was the weather? High ambient temperature and low atmospheric pressure will effect your engine performance quite a bit. 10% low could be a possibility. I think rated power is calculated on a standard day (15 C = 58F and 1013.2 MB = 29.92 inches)
Larry/car is offline   Reply With Quote
Old 07-17-2013, 09:43 AM   #7
Nosferatu
CF Senior Member
St. Jude Donor '14
Thread Starter
 
Nosferatu's Avatar
 
Member Since: Mar 2013
Location: Ahead of You :)
Posts: 4,086
Thanked 92 Times in 58 Posts
Default

I haven't tracked the car yet. It runs healthy and pulls hard (see video below). Car I bought used so I don't know what was done beyond a simple M2W switch and tinting. There's no performance modifications.

I'm hoping to just chuck it up to dyno error. There was a rather decently modified Evo X only putting down 288awhp so I started feeling better once I saw everyone else getting somewhat low numbers. I don't have the dyno sheet yet (guy is emailing me it). Here's a screen shot off the computer monitor on my lower numbered pull. The guy said it may have hurt that traction control was kept on which may limit power on the pulls if it sees slipping. True?



It was in the 80s with high humidity. This is how the car pulls in 3rd (dyno was done in 4th for 1:1).


Last edited by Nosferatu; 07-17-2013 at 09:46 AM.
Nosferatu is offline   Reply With Quote
Old 07-17-2013, 12:43 PM   #8
HOXXOH
CF Senior Member
 
HOXXOH's Avatar
 
Member Since: Sep 2007
Location: Peoria/Phoenix AZ
Posts: 10,233
Thanked 162 Times in 142 Posts
Default

A dyno is simply a tool to tune the car. People who have no other means to compare their cars use the HP numbers from a dyno sheet.

When I took my bone stock 430 rated HP A6 LS3 to get it's first tune, the baseline pull on a Mustang dyno was 306. The final pull was 320. I was comfortable getting a 5% increase. When I returned to the track, my timeslips also averaged .2 seconds quicker. At the track, I was on equal basis with other cars who had much higher dyno numbers.
HOXXOH is offline   Reply With Quote
Old 07-17-2013, 01:54 PM   #9
JRHAWK9
CF Senior Member
 
JRHAWK9's Avatar
 
Member Since: Feb 2006
Location: Lake Delton (WI Dells) WI
Posts: 1,340
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by HOXXOH View Post
A dyno is simply a tool to tune the car. People who have no other means to compare their cars use the HP numbers from a dyno sheet.
People are WAY to stuck on dyno numbers. Dyno numbers can and will be all over the place when using different dynos in different locations on different days.
JRHAWK9 is offline   Reply With Quote
Old 07-17-2013, 02:56 PM   #10
bigwoofersnet
CF Senior Member
 
Member Since: Oct 2007
Posts: 138
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I was a little disappointed with my 369 #'s.. but as stated you can't get caught up on them, they will vary from dyno to dyno. As long as the car runs well, that's all that matters. You could always take it somewhere else to compare, or the best way to judge is the track. Good luck with it.
bigwoofersnet is offline   Reply With Quote
Old 07-17-2013, 04:04 PM   #11
Speedforhire
CF Senior Member
 
Speedforhire's Avatar
 
Member Since: Mar 2011
Posts: 2,017
Thanks: 0
Thanked 6 Times in 5 Posts
Default

Quote:
Originally Posted by HOXXOH View Post
A dyno is simply a tool to tune the car.........
......and a great one it is but just as there are variables to dyno tunes (conditions, etc.,.) there are variables to track times also (conditions, etc.,.). No one tool should be the definitive test.

Speedforhire is offline   Reply With Quote
Old 07-17-2013, 05:35 PM   #12
Larry/car
CF Senior Member
 
Larry/car's Avatar
 
Member Since: May 2008
Location: Manheim Pennsylvania
Posts: 8,712
Thanked 183 Times in 135 Posts
Default

Quote:
Originally Posted by Nosferatu View Post
I haven't tracked the car yet. It runs healthy and pulls hard (see video below). Car I bought used so I don't know what was done beyond a simple M2W switch and tinting. There's no performance modifications.

I'm hoping to just chuck it up to dyno error. There was a rather decently modified Evo X only putting down 288awhp so I started feeling better once I saw everyone else getting somewhat low numbers. I don't have the dyno sheet yet (guy is emailing me it). Here's a screen shot off the computer monitor on my lower numbered pull. The guy said it may have hurt that traction control was kept on which may limit power on the pulls if it sees slipping. True?



It was in the 80s with high humidity. This is how the car pulls in 3rd (dyno was done in 4th for 1:1).

That's a lot of the problem. High temperature a humidity = low power. I bet the density altitude was about 2,000 ft above the area's height above sea level. Oh I failed to mention standard conditions are also based on being at sea level. From what you indicate I think your engine is making correct power for the conditions. Check it again when weather conditions are more favorable. Enjoy!
Larry/car is offline   Reply With Quote
Old 07-17-2013, 07:58 PM   #13
PRE-Z06
Supporting Vendor
 
PRE-Z06's Avatar
 
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 6,453
Thanked 7 Times in 6 Posts
Default

Are those SAE corrected numbers?
PRE-Z06 is offline   Reply With Quote
Old 07-18-2013, 08:32 AM   #14
olefam
CF Senior Member
 
olefam's Avatar
 
Member Since: Oct 2003
Location: Baxter MN
Posts: 732
Thanks: 0
Thanked 1 Time in 1 Post
Default

Perhaps I'm in the minority here, but the only "dyno" that matters to me is the one in the seat of my pants. And it's a pretty simple test...
Put the car in gear. Stomp on the right pedal, Hang on for dear life. If the car either scars the crap out of you, or brings a grin to your face, or both, your "numbers" are excellent.
Glen
olefam is offline   Reply With Quote
Old 07-18-2013, 08:41 AM   #15
C6RaceCar
CF Senior Member
 
Member Since: Sep 2012
Posts: 974
Thanks: 0
Thanked 0 Times in 0 Posts
Default

People tend to forget that a dyno is a tool to measure gains. Getting baseline numbers is a good thing, but dont measure your car's performance from them. Now hitting the 1/4mile and seeing what your mph at the end is would be a good measure of performance.
C6RaceCar is offline   Reply With Quote
Old 07-18-2013, 01:18 PM   #16
gsxrguy84
CF Senior Member
 
gsxrguy84's Avatar
 
Member Since: Feb 2012
Posts: 360
Thanks: 0
Thanked 0 Times in 0 Posts
Default

go find a dyno jet and see what it does on there if you are concerned with it.
gsxrguy84 is offline   Reply With Quote
Old 07-18-2013, 02:45 PM   #17
PRE-Z06
Supporting Vendor
 
PRE-Z06's Avatar
 
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 6,453
Thanked 7 Times in 6 Posts
Default

Quote:
Originally Posted by C6RaceCar View Post
People tend to forget that a dyno is a tool to measure gains. Getting baseline numbers is a good thing, but dont measure your car's performance from them. Now hitting the 1/4mile and seeing what your mph at the end is would be a good measure of performance.
I agree as long as you take into consideration all variables in making a pass at the track ie driver, prep, and DA.
PRE-Z06 is offline   Reply With Quote
Old 07-18-2013, 04:58 PM   #18
HOXXOH
CF Senior Member
 
HOXXOH's Avatar
 
Member Since: Sep 2007
Location: Peoria/Phoenix AZ
Posts: 10,233
Thanked 162 Times in 142 Posts
Default

Quote:
Originally Posted by PRE-Z06 View Post
I agree as long as you take into consideration all variables in making a pass at the track ie driver, prep, and DA.
Just like you keep track of changes on dyno sheets, you need to record 1/4 mile times along with the conditions. No two days on a dyno will be the same nor at the track. Differences of mods/power will show up when averages are taken for comparison.
HOXXOH is offline   Reply With Quote
Old 07-19-2013, 09:35 AM   #19
Nosferatu
CF Senior Member
St. Jude Donor '14
Thread Starter
 
Nosferatu's Avatar
 
Member Since: Mar 2013
Location: Ahead of You :)
Posts: 4,086
Thanked 92 Times in 58 Posts
Default

okay thanks for the input guys. I'm just going to take them with a grain of salt I know the car pulls. Anyways, does traction control hurt on a dyno (especially a mustang dyno since it starts with an initial slip). My friend's Evo ran later and it sounded like the clutch was slipping but then we realized after the fact it was just pulling power to get traction. The dyno graph on mine does a nice little drop after initially getting on it.
Nosferatu is offline   Reply With Quote
Old 07-19-2013, 01:26 PM   #20
PRE-Z06
Supporting Vendor
 
PRE-Z06's Avatar
 
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 6,453
Thanked 7 Times in 6 Posts
Default

Traction control has to be off when you dyno the car, the drop is probably the initial tire spin you described if that's what happened.
PRE-Z06 is offline   Reply With Quote
Go Back   Corvette Forum >
Reload this Page
  • Stock LS3 Dyno Results...boo! :(
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Post your Acceleration Videos Nosferatu C6 Corvette General Discussion 0 06-05-2015 12:30 PM
    C6 Supercharged + Methanol Injection Nosferatu C6 Corvette General Discussion 13 01-17-2015 10:44 AM
    ZR1 709rwhp on Straightline's Mustang dyno video enufpwr C6 Corvette ZR1 17 08-27-2014 09:50 PM
    EnglandGreen Mayhem II cam only - 435rwhp - Mojo1 EG@EnglandGreen C5 Tech 55 11-11-2011 03:09 PM
    **Are you LETHAL** Randy@RaginRacin C6 Z06 Discussion 74 10-13-2010 10:56 AM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 04:29 PM.