Originally Posted by slanteyez

Yes on my DSM on speed density. Our 335is are also using speed density. IAT needs to be working properly to calculate Mass Airflow. If you look at your logs since August you can tell your IAT sensor is malfunctioning which is probably causing all those weird AFRs and fuel trims. Surprised no one as caught that yet.

Interesting...how can you tell that it is malfunctioning though?

[slanteyez]

Originally Posted by FCobra94

Interesting...how can you tell that it is malfunctioning though?

Review all of your logs. Your IATs barely fluctuate especially at WOT. Unless you are running some miracle intercooler that is made so efficient which I doubt then I am pretty sure your IATs is not accurate. Any tuner can see your logs and tell you its malfunctioning from a mile away.

The last log I read on your car your IATs stayed pegged at 61 never changed even after WOT. I am guessing this is your first car that you can log and tune?

http://www.datazap.me/u/fcobra94/log...28&zoom=91-122

thats the last log I read for your car.

[slanteyez]

Heres a log of my car with a properly working IAT sensor.

http://www.datazap.me/u/slanteyez/lo...g=0&data=13-20

Originally Posted by slanteyez

Review all of your logs. Your IATs barely fluctuate especially at WOT. Unless you are running some miracle intercooler that is made so efficient which I doubt then I am pretty sure your IATs is not accurate. Any tuner can see your logs and tell you its malfunctioning from a mile away.

The last log I read on your car your IATs stayed pegged at 61 never changed even after WOT. I am guessing this is your first car that you can log and tune?

http://www.datazap.me/u/fcobra94/log...28&zoom=91-122

thats the last log I read for your car.

Originally Posted by slanteyez

Heres a log of my car with a properly working IAT sensor.

http://www.datazap.me/u/slanteyez/lo...g=0&data=13-20

Actually, the VRSF 7" is just that good

In all seriousness, I'm not doubting that I could have a "bad" TMAP, I just imagine that a failing unit would show more symptoms aside from just less-than erratic temperature readings. Most other members that have posted short pull logs with similar mods seem to exhibit congruent variance in air temp readings though...either way, will keep an eye on it and research further.

Also, what are your current mods?

[slanteyez]

Originally Posted by FCobra94

Actually, the VRSF 7" is just that good

In all seriousness, I'm not doubting that I could have a "bad" TMAP, I just imagine that a failing unit would show more symptoms aside from just less-than erratic temperature readings. Most other members that have posted short pull logs with similar mods seem to exhibit congruent variance in air temp readings though...either way, will keep an eye on it and research further.

Also, what are your current mods?

HAHAH I wish there was an intercooler that GOOD in this world or else VRSF would be billionaires by now. VRSF came in this world through my old platform. Good Ol DSMs

Its a failing unit but the N54 DME doesn't see it yet because it still reads within parameters just not accurately. I mean come on 61 degrees before and after a WOT pull? Not even METH injection can do that. although the DME is soo advanced that it still tries to adjust accordingly causing your erratic fuel trims and AFR.

I would get that TMAP fixed instead of trying to "tune" out those erratic fluctuations. Those are ENOUGH symptoms not to even do WOT on my car. We are very blessed with a very advance DME that sometimes it tunes itself out hiding a lot of symptoms that would be caused by failing sensors.

[Sgop335]

Agreed my iats are flat too, happens to be vrsf 7. I doubt its a bad tmap sensor.

Also, mine is a new tmap atleast on the cp.

[slanteyez]

http://www.ecmtuning.com/wiki/sd101

Heres a link explaining how important IAT is with speed density (although its towards DSMs you can kind of get the basics of it). Remember cars with a MAF actually measures airflow. Our cars do not measure per say it actually calculates airflow through IAT and MAP readings. This is why we can vent a BOV with no problems.

[slanteyez]

Originally Posted by Sgop335

Agreed my iats are flat too, happens to be vrsf 7. I doubt its a bad tmap sensor.

Also, mine is a new tmap atleast on the cp.

http://www.e90post.com/forums/showthread.php?t=1267682

Heres a log with a 7 inch VRSF with a properly working sensor. Cant say yours is malfunctioning but I would look in to it. Like I said our DMEs are very advance that it tries to tune it self out even with failing sensors that it has not detected YET.

[Sgop335]

Originally Posted by slanteyez

http://www.ecmtuning.com/wiki/sd101

Heres a link explaining how important IAT is with speed density (although its towards DSMs you can kind of get the basics of it). Remember cars with a MAF actually measures airflow. Our cars do not measure per say it actually calculates airflow through IAT and MAP readings. This is why we can vent a BOV with no problems.

Ty, yes we know that.

EDIT, i saw his log again, iat does seem too "constant", atleast mine varies a little, so slanteyez may have a point.

[slanteyez]

Originally Posted by Sgop335

Ty, yes we know that.

EDIT, i saw his log again, iat does seem too "constant", atleast mine varies a little, so slanteyez may have a point.

Yeah a flat line of 61 degrees? He must be in Antarctica or something. He will thank me later once he changes it and sees how improved his logs will look. Just surprised no one has caught that yet.

Originally Posted by slanteyez

Yeah a flat line of 61 degrees? He must be in Antarctica or something. He will thank me later once he changes it and sees how improved his logs will look. Just surprised no one has caught that yet.

You may have a point, but I think my logs also need to be taken in context; they're typically done in 3rd gear and I only keep my foot in it for ~2k RPM increments, letting off around 5K each time, way before the turbo starts blowing much hotter air (still within it's efficiency range I imagine).

Here's a 4th gear log from yesterday which shows a lot more action with IAT:
http://datazap.me/u/fcobra94/log-147...-25-28&solo=15

[slanteyez]

This log just confirms that its malfunctioning. Yes it has more fluctuation but do you really want the DME to think the air is really 52 degrees F?

I have never seen a turbo car stay under 60 degrees F under WOT. Maybe the n54 experts can chime in. But I am 100% sure its malfunctioning. Unless you are really in antarctica doing pulls in the middle of the snow.

Originally Posted by FCobra94

You may have a point, but I think my logs also need to be taken in context; they're typically done in 3rd gear and I only keep my foot in it for ~2k RPM increments, letting off around 5K each time, way before the turbo starts blowing much hotter air (still within it's efficiency range I imagine).

Here's a 4th gear log from yesterday which shows a lot more action with IAT:
http://datazap.me/u/fcobra94/log-147...-25-28&solo=15

[Sgop335]

Fcobras latest log does have more action. My guess amb temp was 32-35f, so quite reasonable to get those iats.

[slanteyez]

not at WOT. I know alot of EVOs, STIs, 335is. in snowy areas and no way in hell IATs stay below 60. Hell even 70F!. Unless he is spraying Meth and not telling us.

Originally Posted by Sgop335

Fcobras latest log does have more action. My guess amb temp was 32-35f, so quite reasonable to get those iats.

Correct....ambient was ~34* that day.

No meth.

[Anend_E90]

Stage 1+ 95 Oct, first shot at this high of E85 mix (95.3 octane, 28.8% ethanol (or E29))

335xi with FMIC, DCI, CP

http://www.datazap.me/u/rhamm/log-14...12-13-14-15-24

I had at taper off at 6.1k rpm in 3rd

[slanteyez]

Originally Posted by FCobra94

Correct....ambient was ~34* that day.

No meth.

.... This is the only platform I heard of that thinks its possible to have IATs below 60 during WOT with no METH. Interesting.. N54s must be a GODLY engine. Any reputable tuner would look at your logs and easily say the same thing I am saying. But its a BMW group nothing new lol.

[FEDE/E92]

First here is my set up: fbo, vrsf inlets, stage 2 pumps, new plugs and eldor coils and new vaccum lines, stage 2+ 91ACN


Problem: looking at the dattalog seems like wont taget boost past 15 psi
http://www.datazap.me/u/fedesoto/log...a=3-25&mark=47


Also will thrown code for misfire cyl 5 and 6 at idle when engine noise reduction on
Runs wells otherwise

[IllSic_Design]

All stock with new coils(bosch) and exhaust vanos solenoid, plugs 5k ago. Stage 1+

I see timing corrections but don't really know how to look at logs yet. Should I go back to stage 1 until I get FMIC?
Also believe I have a few leaky injectors(most likely the couple rev9s I have with my rev7) as a couple plugs were wet when I looked at em while changing coils.

http://datazap.me/u/droppedmitsu/mhd...og=0&data=3-23

[Gonzo's 335i]

https://goo.gl/photos/UfU3HNTXcGtF2R7M9
Suggestions!?

[AndyW]

Originally Posted by Gonzo's 335i

https://goo.gl/photos/UfU3HNTXcGtF2R7M9
Suggestions!?

Use datazap?

[Thewind727]

Originally Posted by IllSic_Design

All stock with new coils(bosch) and exhaust vanos solenoid, plugs 5k ago. Stage 1+

I see timing corrections but don't really know how to look at logs yet. Should I go back to stage 1 until I get FMIC?
Also believe I have a few leaky injectors(most likely the couple rev9s I have with my rev7) as a couple plugs were wet when I looked at em while changing coils.

http://datazap.me/u/droppedmitsu/mhd...og=0&data=3-23

log looks ok those small corrections shouldnt be to much of a concern, this is the only log ive ever seen that the lpfp is flatlined at any given psi through the whole run though. not sure what thats about but the rest of it looks ok