Changing MAF reading from tapered to straight

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kenrevo

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	Changing MAF reading from tapered to straight « on: June 25, 2014, 08:38:58 AM »

I bought a 2001 Audi S4 that the owner started going stage 3 but ran into problems and decided to sell it. One of the problems is that the tune is an EPL tune for K04's, Ev14 52lb, 4 bar fuel pump, and a 85mm tapered MAF. The MAF on the car is a 034 open air element with a 85mm MAF which, I assume, is causing problems with my AFR creating my misfires. My AFR goes to ~7 on the high RPM.

I've looked for an EPL MAF housing to get the right one but no one is selling them separately. I was wondering if it would be easy, relatively speaking, to just adjust the tune from a tapered to a straight MAF housing or should I just start from scratch?

Eventually I plan on getting the car tuned but want to get intercoolers and downpipes before I spend lots of money on a tune. I don't have a wideband sensor but can take logs or post the ones just let me know.

Thanks


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tjwasiak

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	Re: Changing MAF reading from tapered to straight « Reply #1 on: June 25, 2014, 08:48:51 AM »

I would start from scratch and tune it properly for hardware you are using.


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nyet

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	Re: Changing MAF reading from tapered to straight « Reply #2 on: June 25, 2014, 10:26:19 AM »

You will not be able to edit the EPL tune.


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phila_dot

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	Re: Changing MAF reading from tapered to straight « Reply #3 on: June 25, 2014, 11:07:16 AM »

You might want to figure out why target lambda is 0.5.

The MAF housing has no direct connection to target lambda.


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kenrevo

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	Re: Changing MAF reading from tapered to straight « Reply #4 on: June 25, 2014, 12:07:12 PM »

Quote from: phila_dot on June 25, 2014, 11:07:16 AM

You might want to figure out why target lambda is 0.5.

The MAF housing has no direct connection to target lambda.

I was told that since the MAF housing was wrong for the tune, what will cause my AFR to be off causing my misfire. I attached my csv files if you want to look.


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ddillenger

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	Re: Changing MAF reading from tapered to straight « Reply #5 on: June 25, 2014, 12:11:05 PM »

How did you get an EPL tune without their fueling kit?

I don't want to make accusations, but it seems as though you're trying to do something untoward.


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nyet

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	Re: Changing MAF reading from tapered to straight « Reply #6 on: June 25, 2014, 12:29:36 PM »

Target lambda is not .5

I'm seeing:
EGT sensor activity (bad EGT, or you have very high egts)
EGT enrich to .7
Also, your O2 voltages look really really bad.


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kenrevo

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	Re: Changing MAF reading from tapered to straight « Reply #7 on: June 25, 2014, 12:33:48 PM »

Quote from: ddillenger on June 25, 2014, 12:11:05 PM

How did you get an EPL tune without their fueling kit?

I don't want to make accusations, but it seems as though you're trying to do something untoward.

It's what came with the car, as I said the car was pieced together [badly].

Also the logs are in second gear, I don't have a good place to do 3rd gear pulls.


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