Thread: On what gear should I Dyno
05-04-2013, 05:56 PM #1
On what gear should I Dyno
On the 55 compressor platform it's 4th gear(1:1 ratio),on what gear should i dyno the 63 platform?
05-04-2013, 07:36 PM #2
55 kompressor is a 5 speed but the gearing is tighter here. I would still think 4th is closest to 1:1?
I don't know, help?
05-04-2013, 08:47 PM #3
Rule of Thumb: Whatever gear is closest to a 1:1 Ratio, so just google your cars drive ratio & figure it outCOBB AP ProTune by Bren of ///Bren Tuning
Akrapovic DP | Helix FMIC | Alpina TCM Flash | Walbro 450LPH Fuel Pump
"The moment money becomes your motivation, you are immediately not as good as someone who is motivated by passion and internal will." -A. Senna
05-05-2013, 02:21 AM #4
05-05-2013, 03:04 AM #5
Ok well there we go use 4th.
05-05-2013, 06:11 PM #6
On 7 speed 5th is 1:1,not 4th,but it seems every one is doing it on 4th even though it shows higher #'s which is wrong #'s.
stock SLS 563 hp minus 18%=461.66 rwhp,now add headers and tune the end result is 478 rwhp!!.will you please explain it to me.
05-05-2013, 06:18 PM #7
05-05-2013, 06:36 PM #8
05-05-2013, 10:46 PM #9
You cant just assume 18% drivetrain loss so generally. also, so many factors affect dyno results. Atmospheric pressure, humidity, ambient air temperature, state of heat soak, the individual dyno itself. The wheel HP numbers simply cant just be stated based on what the factory crank HP rating is. Make sense?
05-06-2013, 12:37 PM #10
I believe 5th gear is 1:1
With a 7G on a stock C63 you use 4th gear because of the limiter. On a tuned car 5th gear is the correct gear.2012 CTS V - Sedan - 6AT
Stage 1 Mods:
- 2.5 upper pulley, Ported snout/throttle body, Fluidyne HX, Airaid CAI w/green filter, ID850 injectors
Stage 2 Mods:
- American Racing Headers w/X-pipe, 9.1 Lower Pulley, Tune Time Custom Cam, Moroso Dual Catch Cans, Zl1 Lid, Norcal Tank
Stage 3 Mods:
- LSA ported/polished heads, 4.5" G-Force intake, Nick Williams 102mm T-body, 8.6 Lower Pulley
12.18 @ 118.98 - STOCK
10.87 @ 127.02 - STAGE 1
10.53 @ 131.31 - STAGE 2
10.47 @ 133.20 - STAGE 3
05-06-2013, 10:13 PM #11
Ok so cars with limiter should use 4th so they don't bump against it but the numbers will be slightly inflated versus 5th which is 1:1. Hope that's straight.
05-06-2013, 10:14 PM #12
05-07-2013, 06:25 AM #13
thank you,but still i did not get my answer.
DFM,i did not assume that 18%,it's widely accepted by tuners in which i'm not one of them,i'm just an observer trying to understand the reasoning.
Thank you for a great Forum
05-07-2013, 06:30 AM #14
05-07-2013, 07:38 AM #15