lean mixture on 125i to 130i tune

Kizzu · 07-05-2014, 08:35 AM

so as the title says I just tuned my 125i and I'm getting a very lean mixture (14.7) also to add to that the torque curve is all over the place and not steady at all. I'm concerned that in my country there is a poor fuel quality and that the temperature of the dyno day was 30 degrees but is this graph ''normal'' or shall I contact my tuner to tweak and arrange it?
ps - Ihave an injen sp1121p and the fuel filter is bound to be replaced

Taskmaster · 07-05-2014, 01:57 PM

The torque curve will have dips, that's the nature of the DISA valves opening. As far as the lean mixture goes, unless your throwing codes, you should be fine - I think it should be richer as you approach red line (like 13.1 or so)

andrey_gta · 07-05-2014, 01:59 PM

That dyno looks very healthy.

See AA tunedynos to see the mixture to be leaner

Taskmaster · 07-05-2014, 02:07 PM

Is the engine power or wheel power? Probably engine power based on the numbers and the dyno type.

kobeballer96 · 07-05-2014, 04:12 PM

Ahh???!! 13 afr and 14s? That's not a safe tune lol. The leanest at wot you want to be is at 11.7 or barely hitting a 12 afr on e85 since it's pretty much knock resisted and runs everything cooler. And 14s afr is like idle. I don't know what you guys are talking about lol

Kizzu · 07-05-2014, 04:37 PM

Quote:

Originally Posted by kobeballer96

Ahh???!! 13 afr and 14s? That's not a safe tune lol. The leanest at wot you want to be is at 11.7 or barely hitting a 12 afr on e85 since it's pretty much knock resisted and runs everything cooler. And 14s afr is like idle. I don't know what you guys are talking about lol

Mine is an e82 and has the n52 engine of the 130i and thus bein a 125i I got it coded as the 130i mapping but I searched a bit on the web and it says that a 14.7 mixture is stoichiometric on 80 octane fuel on an n/a engine. The problem is our fuel is not a high octane fuel.. Thats why I'm worried

Taskmaster · 07-05-2014, 04:51 PM

Quote:

Originally Posted by Kizzu

Mine is an e82 and has the n52 engine of the 130i and thus bein a 125i I got it coded as the 130i mapping but I searched a bit on the web and it says that a 14.7 mixture is stoichiometric on 80 octane fuel on an n/a engine. The problem is our fuel is not a high octane fuel.. Thats why I'm worried

Looks fine, timing would be cut back to compensate.

Kizzu · 07-05-2014, 04:54 PM

Quote:

Originally Posted by TheAxiom

Looks fine, timing would be cut back to compensate.

Didn't understamd it

Taskmaster · 07-05-2014, 05:13 PM

Ignition timing (spark) will be made less aggressive by the ecu to compensate for the gas quality. The A/F ia fine, you can check other dyno for comparison.

MarkkyyMan · 07-06-2014, 01:58 AM

Better to be a little rich than a little lean. Lean can cause issues with heat and lubrication.
Lean a motor out too much and it will burn up.

Is the motor pinging? If so you will want to find a higher octane fuel or different tune.

Kizzu · 07-06-2014, 03:42 AM

Quote:

Originally Posted by MarkkyyMan

Better to be a little rich than a little lean. Lean can cause issues with heat and lubrication.
Lean a motor out too much and it will burn up.

Is the motor pinging? If so you will want to find a higher octane fuel or different tune.

Pinging in what sense?

MarkkyyMan · 07-06-2014, 06:31 PM

Pinging usually sounds like a faint metallic rattle noise from the motor under load.

07-05-2014, 08:35 AM	#1
Kizzu First Lieutenant 41 Rep 306 Posts Drives: Bmw 125i Black Sapphire Join Date: Oct 2013 Location: Malta iTrader: (0)	lean mixture on 125i to 130i tune so as the title says I just tuned my 125i and I'm getting a very lean mixture (14.7) also to add to that the torque curve is all over the place and not steady at all. I'm concerned that in my country there is a poor fuel quality and that the temperature of the dyno day was 30 degrees but is this graph ''normal'' or shall I contact my tuner to tweak and arrange it? ps - Ihave an injen sp1121p and the fuel filter is bound to be replaced Last edited by Kizzu; 07-07-2014 at 01:48 PM..
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07-05-2014, 01:57 PM	#2
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	The torque curve will have dips, that's the nature of the DISA valves opening. As far as the lean mixture goes, unless your throwing codes, you should be fine - I think it should be richer as you approach red line (like 13.1 or so)
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07-05-2014, 01:59 PM	#3
andrey_gta Brigadier General 298 Rep 4,040 Posts Drives: 130i coupé ;) Join Date: Nov 2011 Location: Bimmerpost iTrader: (1) Garage List 2008 BMW 128i [10.00]	That dyno looks very healthy. See AA tunedynos to see the mixture to be leaner __________________ 128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff "The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
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07-05-2014, 02:07 PM	#4
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Is the engine power or wheel power? Probably engine power based on the numbers and the dyno type.
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07-05-2014, 04:12 PM	#5
kobeballer96 Major 175 Rep 1,491 Posts Drives: 6SPD E82 Join Date: May 2013 Location: North Carolina iTrader: (4)	Ahh???!! 13 afr and 14s? That's not a safe tune lol. The leanest at wot you want to be is at 11.7 or barely hitting a 12 afr on e85 since it's pretty much knock resisted and runs everything cooler. And 14s afr is like idle. I don't know what you guys are talking about lol __________________ Black Wrapped Roof, BFG Rivals, Dinan Camber plates, M3 Steering wheel, Matte Black kidney Grills, H&R Sport springs, Sparco assetto gara,Pagid sport Brakepads,STOPTECH Slotted Rotors, DISA STG3,EURO BOX
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07-05-2014, 05:13 PM	#9
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Ignition timing (spark) will be made less aggressive by the ecu to compensate for the gas quality. The A/F ia fine, you can check other dyno for comparison.
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07-06-2014, 01:58 AM	#10
MarkkyyMan Captain 38 Rep 701 Posts Drives: 2010 BMW 128i Join Date: Dec 2009 Location: Indiana, U.S. iTrader: (0)	Better to be a little rich than a little lean. Lean can cause issues with heat and lubrication. Lean a motor out too much and it will burn up. Is the motor pinging? If so you will want to find a higher octane fuel or different tune. Last edited by MarkkyyMan; 07-06-2014 at 02:15 AM..
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07-06-2014, 06:31 PM	#12
MarkkyyMan Captain 38 Rep 701 Posts Drives: 2010 BMW 128i Join Date: Dec 2009 Location: Indiana, U.S. iTrader: (0)	Pinging usually sounds like a faint metallic rattle noise from the motor under load.
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