Am I running rich from my tune?
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MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
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From: Atherton, CA
2019 GLS63 AMG Diamond White
Am I running rich from my tune?
Here's the dyno graph. There are two AF ratio lines. Jeremy tuned my car according to the bottom AF line. Could it possibly be that the first line is the true AF ratio. If so, then I would be running rich. I put down 467whp and 506ft-lbs of tq to the wheels but I thought it would be higher. Do you guys think I'm running rich still?
http://img195.imageshack.us/i/img0156ru.jpg/
http://img141.imageshack.us/i/img0157ku.jpg/
http://img195.imageshack.us/i/img0156ru.jpg/
http://img141.imageshack.us/i/img0157ku.jpg/
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
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From: Atherton, CA
2019 GLS63 AMG Diamond White
MBWorld Fanatic!
Joined: Sep 2008
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From: murfreesboro,tn
2003 porsche 996 turbo
the only true way to know what afr you are running in real world conditions is to datalogg. very expensive engines! if your gonna play and mod a mercedes engine you need to datalogg the wideband afr . only way to do that is to install a 02 sensor before the primary cat and use a zeitronix zt-2 or somilar setup and logg. to lean and you will have a huge paperweight!
MBWorld Fanatic!
Joined: Jun 2010
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From: Puerto Rico
2005 E55 AMG
I've always tuned engines to high 11's/low 12's A/F ratios...but those engines have always been cheap engines and I was willing to risk them ( I've only had one failure in dozens of engines tuned...and the failure seemed like it was because the engine couldn't handle the power, not the tune ). On an engine like ours however I'd honestly stick to low 11's.
IMO, rich you are not.
IMO, rich you are not.
Last edited by GT-ER; Jan 15, 2011 at 09:26 AM.
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MBWorld Fanatic!
Joined: Jan 2004
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From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
A/f seems fine now. We are learning more about ole #8 as the years go buy. Piston 8 runs leaner than the others and seems to almost always pop first. Better rich than lean for sure!!
What dyno did you use? Numbers do seem a touch low for your mods.
Gotta get her to the track. I am learning that is the real dyno.
What dyno did you use? Numbers do seem a touch low for your mods.
Gotta get her to the track. I am learning that is the real dyno.
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Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
Likes: 24
From: Atherton, CA
2019 GLS63 AMG Diamond White
the only true way to know what afr you are running in real world conditions is to datalogg. very expensive engines! if your gonna play and mod a mercedes engine you need to datalogg the wideband afr . only way to do that is to install a 02 sensor before the primary cat and use a zeitronix zt-2 or somilar setup and logg. to lean and you will have a huge paperweight!
A/f seems fine now. We are learning more about ole #8 as the years go buy. Piston 8 runs leaner than the others and seems to almost always pop first. Better rich than lean for sure!!
What dyno did you use? Numbers do seem a touch low for your mods.
Gotta get her to the track. I am learning that is the real dyno.
What dyno did you use? Numbers do seem a touch low for your mods.
Gotta get her to the track. I am learning that is the real dyno.
MBWorld Fanatic!
Joined: Jan 2009
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From: Atlanta
2006 E55 AMG
It is really interesting to see how different tuners tune in relation to a/f curve. What I am used to seeing is an initial drop from say 14:1 where the pull starts to below 12 on blown motors and the a/f as straight as a ruler to where the pull ends. I will insert a graph when I get home to show you guys what I mean.
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
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From: Atherton, CA
2019 GLS63 AMG Diamond White
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,124
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From: Florida-Germany-New York
2004 E55,1969 300SEL6.3,2011 ML350 BlueTec Diesel,2005 ML400 CDI
Just remember that gas is way cheaper than pistons and valves . . . oh, and I really did like the paper weight analogy a few posts back.
