Help with Air /Fuel

ultimateracing335 · 10-10-2009, 09:38 PM

Hey guys just curious to know how other n54 dynojet fuel graphs look like. I'm running really lean even though i have meth. I was hoping its a dynojet problem but other cars that were tested on it are accurate.

Does running the probe after the cat affect the mixture by a big margin???

How about minor exhaust leaks???

I'm fully modded and don't want to blow things up quite yet. There are no fault codes from my bt scans.

Can a bad o2 sensor not come up as a fault?

badass335 · 10-10-2009, 10:36 PM

we need more detail! what are your mods exactly? Tune?

ultimateracing335 · 10-11-2009, 01:06 AM

Quote:

Originally Posted by badass335

we need more detail! what are your mods exactly? Tune?

im running a jb3 unlocked board with ur catted downpipes, ur exhaust, ur bov, ur intake, spearco intercooler and aem meth kit. Im runing lean on all maps ive tried. Im running map9 as a daily driver.

badass335 · 10-11-2009, 01:20 AM

I would email Terry! He's very helpful and can help read the dyno data to give you an idea of what's happening or is possibly happening!

enrita · 10-11-2009, 01:45 AM

nobody can help you here beside Terry, email for support...

ar design · 10-11-2009, 02:06 AM

What readout are you looking at? IMO the Dynojet WB SUCKS. Especially if not meticulously maintained.

TMR · 10-11-2009, 03:38 AM

How lean? DI cars run much leaner than standard injection cars.

boom · 10-11-2009, 07:54 AM

+1 on how lean? You can expect to be 1 to 2 points higher afr than normal port fuel injected turbo cars you've seen. Do a search. I couldn't believe how lean the n54 runs WOT.

Mike@N54Tuning.com · 10-11-2009, 09:17 AM

At a minimum post up your dyno charts with the air/fuel ratios so we can see if they look normal or not. I really doubt you are running lean with methanol unless there is a primary O2 sensor problem. Ever run leaded or questionable gas?

Mike

ultimateracing335 · 10-11-2009, 11:00 AM

Quote:

Originally Posted by Mike@N54Tuning.com

At a minimum post up your dyno charts with the air/fuel ratios so we can see if they look normal or not. I really doubt you are running lean with methanol unless there is a primary O2 sensor problem. Ever run leaded or questionable gas?

Mike

Hey mike if you have any time. Im in the toronto area and have access to a dyno anytime i want (family business). Id like to compare a similar car to mine. Heres my dyno graph.

Mr. 5 · 10-11-2009, 11:03 AM

Quote:

Originally Posted by ultimateracing335

Hey mike if you have any time. Im in the toronto area and have access to a dyno anytime i want (family business). Id like to compare a similar car to mine. Heres my dyno graph.

That does look extremely lean in the higher rpms!

ultimateracing335 · 10-11-2009, 11:04 AM

Quote:

Originally Posted by ar design

What readout are you looking at? IMO the Dynojet WB SUCKS. Especially if not meticulously maintained.

im getting an air fuel guage now but from the vettes we put on the dynojet, the dynos probe is not that off. Again most of them dont have any cats.

cn555ic · 10-11-2009, 11:13 AM

Running that lean especially at high RPMs is not good for the engine especially when its making that much power and using Methanol....puzzling thing is why? I think you need to speak to Terry about this because not too many people are using the TURBO melter map, I think thats what Terry used as a reference for this map, but I can be wrong, but he is your best bet to ask for some help..

ultimateracing335 · 10-11-2009, 11:37 AM

Terry's helping me out but its Sunday and he has family so i don't want to break his balls with emails. There is tons of knowledge on this forum which may give me direction. Who knows my car may be running fine and i may be paranoid. I know from my dyno numbers I'm not making the power others are, so i figure its a fueling issue. Maybe the dyno reads low.

Mike@N54Tuning.com · 10-11-2009, 12:30 PM

Quote:

Originally Posted by ultimateracing335

Terry's helping me out but its Sunday and he has family so i don't want to break his balls with emails. There is tons of knowledge on this forum which may give me direction. Who knows my car may be running fine and i may be paranoid. I know from my dyno numbers I'm not making the power others are, so i figure its a fueling issue. Maybe the dyno reads low.

It doesn't look that lean to me, but let us know what Terry's opinion is on it.

Mike

Mr. 5 · 10-11-2009, 01:16 PM

Quote:

Originally Posted by Mike@N54Tuning.com

It doesn't look that lean to me, but let us know what Terry's opinion is on it.

Mike

I agree with you down low, but up top, that is LEAN.
Especially getting that much power.

ultimateracing335 · 10-11-2009, 02:20 PM

ya where its getting lean its pulling back timing also on my bt logs

ultimateracing335 · 10-11-2009, 10:01 PM

Quote:

Originally Posted by Mike@N54Tuning.com

It doesn't look that lean to me, but let us know what Terry's opinion is on it.

Mike

Terry doesnt like how lean im running so he recomended changing a risistor on the JB3. Before i do anything i will add an air/fuel bung before my cats and do some more pulls. Even on Sunday he looked at my logs abnd dyno graphs. Good guy. I guess he knows what it feels like to spend all this cash on your car and its not running right.

boom · 10-12-2009, 08:44 AM

Quote:

Originally Posted by ultimateracing335

ya where its getting lean its pulling back timing also on my bt logs

It's likely protecting itself from detonation by pulling timing. It has to detect knock though before pulling the timing. Not good.

mwahlert · 10-12-2009, 08:48 AM

running the o2 sensor probe after the cats does not matter as long as they allow the catalysts to stabilize before the pull...

10-10-2009, 09:38 PM	#1
ultimateracing335 Second Lieutenant 35 Rep 220 Posts Drives: blk 335i sedan with mods Join Date: Oct 2008 Location: toronto canada iTrader: (0)	Help with Air /Fuel Hey guys just curious to know how other n54 dynojet fuel graphs look like. I'm running really lean even though i have meth. I was hoping its a dynojet problem but other cars that were tested on it are accurate. Does running the probe after the cat affect the mixture by a big margin??? How about minor exhaust leaks??? I'm fully modded and don't want to blow things up quite yet. There are no fault codes from my bt scans. Can a bad o2 sensor not come up as a fault?
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10-10-2009, 10:36 PM	#2
badass335 Lieutenant Colonel 109 Rep 1,948 Posts Drives: 2017 540i Xdrive Join Date: Jul 2007 Location: Surrey, BC iTrader: (10)	we need more detail! what are your mods exactly? Tune?
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10-11-2009, 01:20 AM	#4
badass335 Lieutenant Colonel 109 Rep 1,948 Posts Drives: 2017 540i Xdrive Join Date: Jul 2007 Location: Surrey, BC iTrader: (10)	I would email Terry! He's very helpful and can help read the dyno data to give you an idea of what's happening or is possibly happening!
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10-11-2009, 01:45 AM	#5
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	nobody can help you here beside Terry, email for support... __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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10-11-2009, 02:06 AM	#6
ar design 296 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	What readout are you looking at? IMO the Dynojet WB SUCKS. Especially if not meticulously maintained. __________________ -Critter
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10-11-2009, 03:38 AM	#7
TMR Brigadier General 394 Rep 3,161 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	How lean? DI cars run much leaner than standard injection cars.
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10-11-2009, 07:54 AM	#8
boom My X5d tows my spec miata to the track. 74 Rep 1,254 Posts Drives: 2010 X5 35d Join Date: Sep 2009 Location: USA iTrader: (0)	+1 on how lean? You can expect to be 1 to 2 points higher afr than normal port fuel injected turbo cars you've seen. Do a search. I couldn't believe how lean the n54 runs WOT.
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10-11-2009, 09:17 AM	#9
Mike@N54Tuning.com Joint Chiefs of Staff 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	At a minimum post up your dyno charts with the air/fuel ratios so we can see if they look normal or not. I really doubt you are running lean with methanol unless there is a primary O2 sensor problem. Ever run leaded or questionable gas? Mike
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10-11-2009, 11:13 AM	#13
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	Running that lean especially at high RPMs is not good for the engine especially when its making that much power and using Methanol....puzzling thing is why? I think you need to speak to Terry about this because not too many people are using the TURBO melter map, I think thats what Terry used as a reference for this map, but I can be wrong, but he is your best bet to ask for some help..
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10-11-2009, 11:37 AM	#14
ultimateracing335 Second Lieutenant 35 Rep 220 Posts Drives: blk 335i sedan with mods Join Date: Oct 2008 Location: toronto canada iTrader: (0)	Terry's helping me out but its Sunday and he has family so i don't want to break his balls with emails. There is tons of knowledge on this forum which may give me direction. Who knows my car may be running fine and i may be paranoid. I know from my dyno numbers I'm not making the power others are, so i figure its a fueling issue. Maybe the dyno reads low.
	Appreciate 0 Quote

10-11-2009, 02:20 PM	#17
ultimateracing335 Second Lieutenant 35 Rep 220 Posts Drives: blk 335i sedan with mods Join Date: Oct 2008 Location: toronto canada iTrader: (0)	ya where its getting lean its pulling back timing also on my bt logs
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10-12-2009, 08:48 AM	#20
mwahlert Lieutenant Colonel 95 Rep 1,659 Posts Drives: 2009 335i Join Date: Apr 2008 Location: NC iTrader: (8)	running the o2 sensor probe after the cats does not matter as long as they allow the catalysts to stabilize before the pull...
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