Question for all 185 pulley and tune user?
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2002 C32, 2012 S550
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I current have NGK Iridium IX Spark Plugs one step colder than stock. But have not yet re-dynoed it. (It does not make sense to re-dyno for new plugs
). I also have new fuel filter. Well, let see what it makes on May 16th. I think good spark plugs would make you run leaner. Good fuel filter should make you run richer.
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Stock when dynoed.
I current have NGK Iridium IX Spark Plugs one step colder than stock. But have not yet re-dynoed it. (It does not make sense to re-dyno for new plugs). I also have new fuel filter. Well, let see what it makes on May 16th. I think good spark plugs would make you run leaner. Good fuel filter should make you run richer.
I current have NGK Iridium IX Spark Plugs one step colder than stock. But have not yet re-dynoed it. (It does not make sense to re-dyno for new plugs
). I also have new fuel filter. Well, let see what it makes on May 16th. I think good spark plugs would make you run leaner. Good fuel filter should make you run richer.Adding mods that help lower boost (i.e. addressing post-blower restrictions) has been shown to help this, as has Bulldogger's mod to add more fuel pressure to his SRT-6 (bear in mind, he was running as lean as 15:1 at high rpm on the dyno, and he's running the 181mm crank pulley). I have a feeling that we'll see many 181's and 185's follow in his footsteps, in order to run safer AFR's at high rpm.
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From: Lebanon
Cls63 & C32
yes if our stock fuel system as it appears with the 185 pulley is overtaxes, so we must upgrade it to gain the maximum power from this setup, this by upgrading the fuel pump or the injectors not by lowering the boost.
I am just thinking if we are running with stock heat range plugs like oem and ik20, this will affect our high top rpm AFR???
I am just thinking if we are running with stock heat range plugs like oem and ik20, this will affect our high top rpm AFR???
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03 g35 coupe...........02 c32 Sold
Hmmm... not sure that different plugs or fuel filter will materially affect your AFR. Seems that the 185mm crank pulley + tune overtaxes the stock fuel system at high load, high rpm - this has been pretty well documented at this point.
Adding mods that help lower boost (i.e. addressing post-blower restrictions) has been shown to help this, as has Bulldogger's mod to add more fuel pressure to his SRT-6 (bear in mind, he was running as lean as 15:1 at high rpm on the dyno, and he's running the 181mm crank pulley). I have a feeling that we'll see many 181's and 185's follow in his footsteps, in order to run safer AFR's at high rpm.
Adding mods that help lower boost (i.e. addressing post-blower restrictions) has been shown to help this, as has Bulldogger's mod to add more fuel pressure to his SRT-6 (bear in mind, he was running as lean as 15:1 at high rpm on the dyno, and he's running the 181mm crank pulley). I have a feeling that we'll see many 181's and 185's follow in his footsteps, in order to run safer AFR's at high rpm.
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I believe LET had tried this but unsuccessfully since there is only that much flow (gas) inside the pipe as the max our pump can push. We need a better pump. But which pump? No one has the answer yet.
I believe he means by increasing the diagonal of the air flow like the modified intake manifold or Needwing intake many fold, or headers, not by running smaller pulleys
I don't think so either. I've said to see if it makes any different. However, a clogged fuel filter, or bad/weak fuel pump may reduce a lot of flow to the injectors. This will be soon answered.
It's great if you can do a research on this. Call dealer to ask if they can fit. Please update us.
I believe he means by increasing the diagonal of the air flow like the modified intake manifold or Needwing intake many fold, or headers, not by running smaller pulleys
Hmmm... not sure that different plugs or fuel filter will materially affect your AFR
It's great if you can do a research on this. Call dealer to ask if they can fit. Please update us.
Last edited by CLKCLK; May 7, 2009 at 06:36 PM.
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Thread Starter
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From: Lebanon
Cls63 & C32
but the main issue we want to know where is the problem before we pay more money, is it with the tune, with the pump, plugs???? we are all waiting May 16.
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From: Lebanon
Cls63 & C32
Tomorow i'll do a test for the pump:
i'll put something like gate valve ( i don't know how is called, sorry for my english) in the return pipe at the fuel filter, like this the system will overflow and i'll see the AFR.
BTW stock pump c32 has a pressure of 4 bars (58-60 psi), today i have test it.
i'll put something like gate valve ( i don't know how is called, sorry for my english) in the return pipe at the fuel filter, like this the system will overflow and i'll see the AFR.
BTW stock pump c32 has a pressure of 4 bars (58-60 psi), today i have test it.
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I didn't, left it at manufacturers OEM setting. I installed mine prior to adding boost. But from what I've researched, it seems that gapping at .035 is best?
I think OEM is .039 for the IK20's.
Anyone else with any experience? Should I re-gap my plugs prior to getting Dyno tuned by LET?
Thanks in Advance!
I think OEM is .039 for the IK20's.
Anyone else with any experience? Should I re-gap my plugs prior to getting Dyno tuned by LET?
Thanks in Advance!
Thread Starter
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From: Lebanon
Cls63 & C32
I did the test today, no change in the AFR.
The pressure of the fuel system was 4 bars, i closed the valve that I installed on the return pipe to I got 4.5 bars then to 5 bars, the AFR still the same, lean at high rpm.
So our problem is not in the pump.
The pressure of the fuel system was 4 bars, i closed the valve that I installed on the return pipe to I got 4.5 bars then to 5 bars, the AFR still the same, lean at high rpm.
So our problem is not in the pump.
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But the increased fuel system pressure lowers the duty cycle on the injectors, correct? Your tune can subsequently be revised adding more fuel back in - at least, this is my fairly rudimentary understanding of the tuning side of it.
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Cool, thanks for taking the time and testing that for all of us!
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2006 E55 2005 Crossfire SRT-6
I have a question for the people that have experienced going lean.... is it only on a dyno that you go lean? I have a lot of mods on my car (see sig) and when "street tuning in Mexico" I never go leaner than 12.8:1... and I have taken the car up to 140mph in 4th gear and hit 21psi (low boost due to manifolds but a lot more gm's/sec of airflow). And I have zero fuel mods.
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I have a question for the people that have experienced going lean.... is it only on a dyno that you go lean? I have a lot of mods on my car (see sig) and when "street tuning in Mexico" I never go leaner than 12.8:1... and I have taken the car up to 140mph in 4th gear and hit 21psi (low boost due to manifolds but a lot more gm's/sec of airflow). And I have zero fuel mods.
After retune, the problem is gone now, but they show as lean as each other on the dyno. My retune was a bit improved between 5200rpm-5500rpm, but still high at 13.x-14.x and after that it all sky rock the same
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From: Lebanon
Cls63 & C32
I have the LM-1 wideband installed before cats, i am running lean on street at 3, 4 and 5 gear.
First tune i didn't have yet the LM-1 but the car was losing power at high rpm,second tune: AFR= 15 after 5200, after my third tune AFR= 15 after 5500.
BTW E55K have a pressure fuel system of 6 bars, today i have test it on my friend car.
First tune i didn't have yet the LM-1 but the car was losing power at high rpm,second tune: AFR= 15 after 5200, after my third tune AFR= 15 after 5500.
BTW E55K have a pressure fuel system of 6 bars, today i have test it on my friend car.
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From: East Bay, Bay Area
2002 C32, 2012 S550
I have a question for the people that have experienced going lean.... is it only on a dyno that you go lean? I have a lot of mods on my car (see sig) and when "street tuning in Mexico" I never go leaner than 12.8:1... and I have taken the car up to 140mph in 4th gear and hit 21psi (low boost due to manifolds but a lot more gm's/sec of airflow). And I have zero fuel mods.
I was going to send it back to Jerry for a re-tune, but decided just to wait until the Northern CA Custom Dyno tuning day which was a month away at the time. So I've just been taking it easy until then.
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From: Lebanon
Cls63 & C32
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From: ny
SRT6
What you need to do is find the stock specs on the factory pump. The SRT6 one flowed 60 g/p/h at 45psi and 45 g/p/h at 73psi. The SL55 AMG pump flows 95 g/p/h at 45 psi and 75 g/p/h at 75psi the flow is greater but very close to operating psi.
What you guys need to do is look for an intank fuel pump that was used in some year AMG car. If the SL65 has one then I would look into it. Look for any Mercedes car with factory hp of 450+ that uses an intank pump.
As far as why some of you guys and some SRT6 guys run lean and some don't all has to do with the mods. If your intake is a little on the restricted side you won't run lean. If your intake has no restriction but your exhaust is a little restrictive you won't run lean. When you combine both, a near zero restriction on intake and exhaust then you have the magic comdo for running lean. My intake is SL55 with high flow filters and modded intake plenums. My exhaust is primary cats and straight through dual pipes with Kooks racing mufflers. If you hold up my exhaust you can look through it like a telescope. Hope this helps.
If you find the factory pump is up to the task then the next choice would be larger injectors. I would like to see the pump spec first, before going the injector route.
What you guys need to do is look for an intank fuel pump that was used in some year AMG car. If the SL65 has one then I would look into it. Look for any Mercedes car with factory hp of 450+ that uses an intank pump.
As far as why some of you guys and some SRT6 guys run lean and some don't all has to do with the mods. If your intake is a little on the restricted side you won't run lean. If your intake has no restriction but your exhaust is a little restrictive you won't run lean. When you combine both, a near zero restriction on intake and exhaust then you have the magic comdo for running lean. My intake is SL55 with high flow filters and modded intake plenums. My exhaust is primary cats and straight through dual pipes with Kooks racing mufflers. If you hold up my exhaust you can look through it like a telescope. Hope this helps.
If you find the factory pump is up to the task then the next choice would be larger injectors. I would like to see the pump spec first, before going the injector route.
