I am really disappointed
Thread Starter
Racer
Joined: Jan 2006
Posts: 409
Likes: 1
From: Charlotte NC
I am really disappointed
I have an '07 Z-51 Coupe with 1,700 miles.
Mods to date are: 160 stat, Magnaflow catback, Vararam w/ spacer, Ported throttle body and LG long tubes.
Took the car in today for a tune and dyno on a DynoJet.
Base line with all the mods was 342 RWHP.
After the tune we got a best of 355 RWHP and 346 RWTQ.
Dyno run in 4th gear.
Using a 15% drivetrain loss, the FWHP only comes up to 408.
12.8 AFR.
Ambient temp was 57 degrees. Low humidity.
I'm disappointed in these numbers. Seem kinda low. I was looking forward to 370+. I am, however, pleased with SOTP dyno. Seems much more responsive. 1-3rd gears feel much more powerful.
Were my expectations too high? Are the numbers in line?
Opinions welcome.
Mods to date are: 160 stat, Magnaflow catback, Vararam w/ spacer, Ported throttle body and LG long tubes.
Took the car in today for a tune and dyno on a DynoJet.
Base line with all the mods was 342 RWHP.
After the tune we got a best of 355 RWHP and 346 RWTQ.
Dyno run in 4th gear.
Using a 15% drivetrain loss, the FWHP only comes up to 408.
12.8 AFR.
Ambient temp was 57 degrees. Low humidity.
I'm disappointed in these numbers. Seem kinda low. I was looking forward to 370+. I am, however, pleased with SOTP dyno. Seems much more responsive. 1-3rd gears feel much more powerful.
Were my expectations too high? Are the numbers in line?
Opinions welcome.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
From what I've read here, for a MN6 it does seem low. It seems to me as if you're tuned numbers, with improvements are in the area of no tune and no mods, and that's not good.
Team Owner
Joined: Feb 2001
Posts: 27,253
Likes: 134
From: Short Hills, NJ
That is a little low but do keep in mind that technically the thermostat, Vararam and especially the cat back won't really show much gain on the dyno.
Also note that a good or proper tune (not saying that's what you did or didn't get here) isn't necessarily the tune that shows the higher dyno number (all else being equal), it's the one that performs best out on the track/road. I've seen a 396rwhp car beat an otherwise similar 430+rwhp one based on those very principles.
Also note that a good or proper tune (not saying that's what you did or didn't get here) isn't necessarily the tune that shows the higher dyno number (all else being equal), it's the one that performs best out on the track/road. I've seen a 396rwhp car beat an otherwise similar 430+rwhp one based on those very principles.
Melting Slicks
Joined: Sep 2006
Posts: 2,034
Likes: 0
From: Beaverton OR
I think those numbers are low based on my experience with my 2005 A4.
My dyno (Mustang) before I did any mods was also 342 RWHP.
After Vararam, Corsa Sports, Melrose headers and a tune I was at 378 RWHP.
Don't know why there would be so much difference.
My dyno (Mustang) before I did any mods was also 342 RWHP.
After Vararam, Corsa Sports, Melrose headers and a tune I was at 378 RWHP.
Don't know why there would be so much difference.
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
bob, i argue with you, your # is too low, the lg lt alone should have given you around 25-30hp & 40ish tq. perhaps the tuner dyno your car while it was heat soak or the pcm pulled some timing due to too much timing was added. best way is to take it to your local track and see what you trap. don't worry about the et if you are concern about not wanting to beating up the drive line, or dyno it again at some other shop. good luck.
Le Mans Master
Joined: Nov 2004
Posts: 6,566
Likes: 2
From: Goleta CA
Cruise-In VIII Veteran
You have no baseline run to make any comparison. All this shows is the difference that the tune made, you have no data about your car when it was stock. Now every car is different, but the all are close to 400hp. Do you really think that your car is only making 8hp more than when it was totally stock? If is was, you wouldn't even feel a difference. For all you know, the dyno could be way out of calibration. Did you see any other C6s run on that dyno that day?
Intermediate
Joined: Feb 2007
Posts: 45
Likes: 0
Those numbers are terrible bro!! I DYNOED MY CAR ON A MUSTANG DYNO WHICH THE NUMBERS ARE USALLY LOW ON THAT KIND OF DYNO AND I WAS AT 350RWHP WITH LIKE 362 TQ. SOMTHING MUST BE WRONG WITH YOUR CAR BECAUSE WHAT I HAVE NOW IS CORSA SPORT EXHAUST VARRAM SND SPACER AND A 160 STAT WITH NO TUNE AND I KNOW IM AROUND LIKE 365RWHP ON A DYNO. BUT ON THE STREET SHES A BEAST!
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Melting Slicks
Joined: Oct 2006
Posts: 2,905
Likes: 1
I have an '07 Z-51 Coupe with 1,700 miles.
Mods to date are: 160 stat, Magnaflow catback, Vararam w/ spacer, Ported throttle body and LG long tubes.
Took the car in today for a tune and dyno on a DynoJet.
Base line with all the mods was 342 RWHP.
After the tune we got a best of 355 RWHP and 346 RWTQ.
Dyno run in 4th gear.
Using a 15% drivetrain loss, the FWHP only comes up to 408.
12.8 AFR.
Ambient temp was 57 degrees. Low humidity.
I'm disappointed in these numbers. Seem kinda low. I was looking forward to 370+. I am, however, pleased with SOTP dyno. Seems much more responsive. 1-3rd gears feel much more powerful.
Were my expectations too high? Are the numbers in line?
Opinions welcome.
Mods to date are: 160 stat, Magnaflow catback, Vararam w/ spacer, Ported throttle body and LG long tubes.
Took the car in today for a tune and dyno on a DynoJet.
Base line with all the mods was 342 RWHP.
After the tune we got a best of 355 RWHP and 346 RWTQ.
Dyno run in 4th gear.
Using a 15% drivetrain loss, the FWHP only comes up to 408.
12.8 AFR.
Ambient temp was 57 degrees. Low humidity.
I'm disappointed in these numbers. Seem kinda low. I was looking forward to 370+. I am, however, pleased with SOTP dyno. Seems much more responsive. 1-3rd gears feel much more powerful.
Were my expectations too high? Are the numbers in line?
Opinions welcome.
Safety Car
Joined: Dec 2006
Posts: 4,895
Likes: 0
From: Monterey California
in your case, take your car to a 1/4 and then see where you are at. Right away, your choice of a vararam was not going to produce gains that are visible on a dyno.. If thats the path you wanted, should have just went LPE inlet, ported intake, headers, catless, bullets
Le Mans Master
Joined: Oct 2005
Posts: 5,051
Likes: 889
From: Tampa Florida
Hey OCCOMSRAZOR, I was looking for a set up like this. Your numbers are pretty high for an A4. I have a MN6 and planning to get the Melrose headers myself. I already have the VARARAM. What was your torque? Thanks
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
That is a little low but do keep in mind that technically the thermostat, Vararam and especially the cat back won't really show much gain on the dyno.
Also note that a good or proper tune (not saying that's what you did or didn't get here) isn't necessarily the tune that shows the higher dyno number (all else being equal), it's the one that performs best out on the track/road. I've seen a 396rwhp car beat an otherwise similar 430+rwhp one based on those very principles.
Also note that a good or proper tune (not saying that's what you did or didn't get here) isn't necessarily the tune that shows the higher dyno number (all else being equal), it's the one that performs best out on the track/road. I've seen a 396rwhp car beat an otherwise similar 430+rwhp one based on those very principles.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
I'm going to point at the TB and vararam spacer. Can you swap out and re-dyno with stock TB without the spacer? Air flow can be a tricky thing. If you were local, I would take a look but NC is a bit far. Something isnt right.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
bob, i argue with you, your # is too low, the lg lt alone should have given you around 25-30hp & 40ish tq. perhaps the tuner dyno your car while it was heat soak or the pcm pulled some timing due to too much timing was added. best way is to take it to your local track and see what you trap. don't worry about the et if you are concern about not wanting to beating up the drive line, or dyno it again at some other shop. good luck.
Team Owner
Joined: Jun 2001
Posts: 26,714
Likes: 344
From: Houston, TX
You have no baseline run to make any comparison. All this shows is the difference that the tune made, you have no data about your car when it was stock. Now every car is different, but the all are close to 400hp. Do you really think that your car is only making 8hp more than when it was totally stock? If is was, you wouldn't even feel a difference. For all you know, the dyno could be way out of calibration. Did you see any other C6s run on that dyno that day?
I think some people missed the point that the numbers he shows were comparing with the mods and no tune, to the same mods but with a tune added.
A dyno is just a relative instrument. It is not absolute. Also, the 15% loss is just a rule of thumb - it is what it is. If the dyno is off (relative to another dyno) then the losses change.
Also, unless I missed it, you don't say if your car is a manual or automatic. I'm guessing manual by the way you described things. (never mind, just went back and looked at your sig)
Without a baseline, or maybe running it back to back on the same dyno right after they dyno a stock C6 would probably give you an idea of your gains. I'm of the school that bone stock cars are going to put out pretty close to the same hp. I think most variations are in the dyno, not the car. Anything less than 5rwhp is insignifant IMHO.
Last edited by jschindler; Mar 12, 2007 at 09:26 PM.
Melting Slicks
Joined: Sep 2006
Posts: 2,034
Likes: 0
From: Beaverton OR
My stock numbers were 342 rwhp, 336 rwtq.
I added the Melrose, random cats, x-pipe and Corsa sport, Vararam and tune by Tom Wong with these results:
378 rwhp, 358 rwtq.
These numbers were pulled on the same Mustang dyno.
Drifting
Joined: Feb 2005
Posts: 1,321
Likes: 0
From: Catonsville MD
I don't think I've seen this many threads on one forum about "dyno numbers" since I logged on the supra forum.
Go run your car, and let us know what it runs. Dyno numbers are for garage queens. The only number you should be concerned about when dyno'ing is the A/F.
Go run your car, and let us know what it runs. Dyno numbers are for garage queens. The only number you should be concerned about when dyno'ing is the A/F.