dyno results question
Thread Starter
Heel & Toe
Joined: Jan 2011
Posts: 21
Likes: 0
From: Youngstown NY
dyno results question
Hello everyone, I just posted this in the scan & tune section but i realized there is much more traffic in this section, so i may receive a better answer here. I had my dyno tune today and was wondering if anyone could give me their opinion on the numbers my car made. First off it is a stock c5 coupe with bolt ons. Bolt ons include long tube headers, x-pipe with high flow cats, Borla straight pipes, Breathless performance ram air intake, ls6 intake manifold, slp underdrive pulley, 3800 vigilante stall converter, 3.42 gears. The car's baseline with all of the mods made 301.64 horsepower and 297.35 ft.lb of torque. the second run after the "tune" made 303.08 horsepower and 335.06 ft.lb of torque. I understand the numbers will be off because of the torque converter, but the horsepower only rising 2 hp seems VERY strange to me. The conditions today were 69 degrees with 75% humidity. Do these numbers sound right to anyone? Please let me know all of your opinions! Thank You
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
It depends on what dyno you ran on and how much it is corrected for or lack there of. Dynojets, mustang dynos, etc. all have somewhere between a 10%-15% increases in the readings shown to make up for a perceived correction need.
I went from a shop that had a dyno jet that read my car at 340whp with similar mods, and at the next shop, which used a "dyno log" dyno, (which has no correction). My car is now read at 305whp. Not that any power was lost, but they all read differently.
I went from a shop that had a dyno jet that read my car at 340whp with similar mods, and at the next shop, which used a "dyno log" dyno, (which has no correction). My car is now read at 305whp. Not that any power was lost, but they all read differently.
Thread Starter
Heel & Toe
Joined: Jan 2011
Posts: 21
Likes: 0
From: Youngstown NY
Thank you for the input! I should have mentioned it was a dynojet. Although, even if it was a lower reading dyno, my torque numbers jumped up almost 40 ft.lb. after the tune. Yet there was minimal, almost no horsepower increase at all. I may be over analyzing, but I just wanted to make sure everything sounded "right" I will try posting pictures of my graphs as soon as i get them into my computer.
Thread Starter
Heel & Toe
Joined: Jan 2011
Posts: 21
Likes: 0
From: Youngstown NY
Race Director
Joined: Mar 2003
Posts: 10,789
Likes: 894
From: Northern Illinois
Oldtimer
Is your car an automatic? Typically, they dyno lower than an M6. I've seen stock A4 C5's dyno anywhere from the 285-310 rwhp range. It also depends on the dyno. The numbers are usually a little lower on a Mustang dyno. With those mods, I'd think you should be in the 335-350 rwhp range, but every car is different. My M6 '98 made around 320 rwhp when I had it dynoed for a baseline before I started modding it. 
Advanced
Joined: Jun 2010
Posts: 96
Likes: 0
From: Rochester New York
Heres my numbers from early last year on my 2000 A4 stock with 69k miles 3.15 gears
Sae corrected on a dynojet
Stock...291.04 Hp and 301.34 Tq
Tuned 303.09 Hp and 316.05 Tq
weather was between 70-74 degrees and 17% humidity.
Sae corrected on a dynojet
Stock...291.04 Hp and 301.34 Tq
Tuned 303.09 Hp and 316.05 Tq
weather was between 70-74 degrees and 17% humidity.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Thread Starter
Heel & Toe
Joined: Jan 2011
Posts: 21
Likes: 0
From: Youngstown NY
Thanks for all of the replies. And yes I do take the Numbers with a grain of salt. I care much more about track Numbers then dyno Numbers. Although it was just confusing to me that the torque Numbers rose so much and the horsepower did not. If anyone can see in the link that I posted to my graphs, the air fuel ratio seems off to me dropping to high 10 low 11's at WOT and was way up around 16 cruising
Racer
Joined: Mar 2013
Posts: 325
Likes: 0
I didn't look at that. I don't know what is going on with your A/F ratio. I'd slap my tuner in the face if I saw that and ask him to try again when he isn't drunk.
You should be at or around 12-13:1 A/F ratio all the way through the pull. Not lean as hell in the beginning and then going pig rich.
Example of a properly done dyno on a Corvette:
See the difference?
You should be at or around 12-13:1 A/F ratio all the way through the pull. Not lean as hell in the beginning and then going pig rich.
Example of a properly done dyno on a Corvette:
See the difference?
Last edited by hamhead; Jun 14, 2013 at 01:21 PM.
Le Mans Master
Joined: Feb 2007
Posts: 9,296
Likes: 1,531
From: Oviedo Florida
2024 C5 of the Year Finalist - Modified
2024 C2 of the Year Finalist - Modified
2023 C2 of the Year Finalist - Modified
2021 C2 of the Year Finalist - Modified
2016 C5 of Year Finalist
variables when using a dyno. It is a number and it vary's .
On the ground (track) is your best bet when talking numbers.
Dyno numbers can be confusing and does it really make a difference?
Just bragging rights. If you don't like your numbers increase
them, if that's important to you. Folks like me don't care, anyway.
Race Director
Joined: Mar 2003
Posts: 10,789
Likes: 894
From: Northern Illinois
Oldtimer
I'd take dyno readings on any car with a grain of salt. It's nice to be able to say you're making a high amount of rwhp, but you still have to get it to hook up. I have friends that are making nearly 600 rwhp, but they can't get out of the 12's because they have no traction.
Burning Brakes
Joined: Jul 2010
Posts: 959
Likes: 50
From: Peters Colony Republic of Texas
2002 C5 w/A4 results
My completely stock 2002 coupe (w/A4) baselined at 305 hp and 318 lb/ft. with a 2:73 gearset.
After adding a CAI (K&N), Z06 Ti exhaust and L/T headers, my results were 333 hp and 347 lb/ft, as tuned by LG.
I think the tuner can be conservative to aggressive in his tune, and your tuner may have been on the conservative side of things.
At the end of the day, you get off the line using torque. So your torque results are likely the ones you will feel in the seat of your pants.
More performance = more $$$$$$.
You can keep on adding mods until you either (a) run out of cash or (b) get the results you are finally looking for (not likely).
The Lizzard
After adding a CAI (K&N), Z06 Ti exhaust and L/T headers, my results were 333 hp and 347 lb/ft, as tuned by LG.
I think the tuner can be conservative to aggressive in his tune, and your tuner may have been on the conservative side of things.
At the end of the day, you get off the line using torque. So your torque results are likely the ones you will feel in the seat of your pants.
More performance = more $$$$$$.
You can keep on adding mods until you either (a) run out of cash or (b) get the results you are finally looking for (not likely).
The Lizzard
Thread Starter
Heel & Toe
Joined: Jan 2011
Posts: 21
Likes: 0
From: Youngstown NY
I agree 100% that dyno Numbers are unimportant. But my main concern with looking at my graphs is how jagged the pulls are. The lines are not smooth whatsoever. Also the air:fuel ratio seems off to me as you can see in the graph I posted earlier in this thread. If possible can someone post a graph of their air:fuel ratio throughout their pull?