I'll say 205.....211 tops.
C350 Dynoed
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AMG
its definitely 22%, having done actual dyno comparisons on Dynojet vs. DD on same day with same car, dynojet 18% and dyno dynamics came in almost exactly at 22%, so you the 292HP number is definitely the accurate one.
Regarding Air fuels, Did he go full throttle from the beginning or only 4200rpm+? 4200+ rpm the graph looks totally fine, and is roughly around ~13.1 which is totally fine. The 15+ though is concerning but again tough to say.
Also, Go back to your dyno shop and have them print you out a new graph which a much lower Y-axis scale so you can actually see whats going on, the scale is too high so you can't really see any definition on the chart, they look almost horizontal. The max you need on y-axis is 300-350 tops, 500 is overkill to say the least.
hope that helps.
Regarding Air fuels, Did he go full throttle from the beginning or only 4200rpm+? 4200+ rpm the graph looks totally fine, and is roughly around ~13.1 which is totally fine. The 15+ though is concerning but again tough to say.
Also, Go back to your dyno shop and have them print you out a new graph which a much lower Y-axis scale so you can actually see whats going on, the scale is too high so you can't really see any definition on the chart, they look almost horizontal. The max you need on y-axis is 300-350 tops, 500 is overkill to say the least.
hope that helps.
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98 Black C43 , 12’ ML 350 Blutec
I don't know,something just doesn't seem right.A 38hp "claim" increase on a naturally aspirated car, from a ECU tune , with no other mods?I agree the AFR isn't right.I hope this doesn't lead to "down the road reliability issues".
Thread Starter
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From: Boston, MA
C350
I hope so too. I guess we just found out that the real gain is more like 24hp, which, on the good side, is safer (I suppose). Also, from what I read before doing the tune, MKB is one of the most reputable Benz tuners, and they had this same ECU software for a while now, so I'm guessing (again) that its been tested.
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From: Carlsbad California
C350 and a Lightning.
Too bad the op didn't dyno before his "tune".
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W205 C400
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AMG
Dyno Dynamics does not have that level of variance, Most change you will see is 1-2HP difference, it is extremely accurate & precise.
With that said, most software claims are exaggerated because HP sells, the more they claim the more they sell. The best thing to do is go by actual dyno results on a loading dyno to see how they actually perform with both before & after dyno done on the exact same dyno in similar conditions. On most MB NA applications 10-15HP is about all you will get max (if that, except for a few exceptions where the stock ECU was detuned such as C63 & etc).
With that said, most software claims are exaggerated because HP sells, the more they claim the more they sell. The best thing to do is go by actual dyno results on a loading dyno to see how they actually perform with both before & after dyno done on the exact same dyno in similar conditions. On most MB NA applications 10-15HP is about all you will get max (if that, except for a few exceptions where the stock ECU was detuned such as C63 & etc).
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ML430, Mini Cooper S and Porsche 911 Twin Turbo
Dyno Dynamics resolution and accuracy....
As far as I can read the Dyno Dymanics website specifies resolution, but not accuracy - see this link as an example:
http://www.dyno.com.au/dyno/controll...ow2WD450DSPage
Specifically ths part:
Power Analogue bar & digit: kW (HP) [0.1 kW (0.1 HP) resolution]
Having the resolution they claim is great for on the fly tuning but from run to run if its repeatability / accuracy is not specified (which it isn't) then absolute measurements are debatable and subject to significant variance.
Therefore as chubbs032 has posted above (and others elsewhere) back to back runs may vary significantly - can be as much as 10-30HP.
As another data point multi million dollar engine dyno's used in F1 only achieve an accuracy of 5% at best - thats a dyno right on the crank removing all question of transmission loss in an air conditioned test chamber.
I'm not saying DD isn't a good dyno - it's probably one of the best out there, imho just don't try and use it for something it wasn't designed for. There's a big difference in meaning between resolution and absolute accuracy.
http://www.dyno.com.au/dyno/controll...ow2WD450DSPage
Specifically ths part:
Power Analogue bar & digit: kW (HP) [0.1 kW (0.1 HP) resolution]
Having the resolution they claim is great for on the fly tuning but from run to run if its repeatability / accuracy is not specified (which it isn't) then absolute measurements are debatable and subject to significant variance.
Therefore as chubbs032 has posted above (and others elsewhere) back to back runs may vary significantly - can be as much as 10-30HP.
As another data point multi million dollar engine dyno's used in F1 only achieve an accuracy of 5% at best - thats a dyno right on the crank removing all question of transmission loss in an air conditioned test chamber.
I'm not saying DD isn't a good dyno - it's probably one of the best out there, imho just don't try and use it for something it wasn't designed for. There's a big difference in meaning between resolution and absolute accuracy.
Last edited by timdf; May 3, 2009 at 08:36 PM.
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Did you guys measure inlet air temperature when you did these pulls????? If you did not then these results are about as much use as **** on a bull for comparative purposes & creating a base line.
