EDC16 REMOVING MAF DIAG LIMIT AT 1275

**DiegoStud** · 28th December, 2019, 03:56 PM

Away so can't see your file but 194409 onwards is also UACC_ESBNormVal_C like 1F1ED9. So make the same change there from 200 to 255 as you have done at 1F1ED9.

**vwstuff** · 29th December, 2019, 03:34 PM

Got It Thanks

**vwstuff** · 3rd January, 2020, 04:34 PM

I fact I need another formule what is the best one ?
Log done at 2750 Mbars request

**DiegoStud** · 5th January, 2020, 06:18 PM

You must have an intercooler the size of a patio door sitting in a bath of LN2.
Before you go down the formula changing route, have you considered the possibility you may have a boost leak? Or that your MAF is lying?

I mean let's do a bit of quick maths- MAF/PR/CC= rough VE calculation.
@1500rpm VE is around 100%. On the optimistic side but there's a large volume of air being filled in the intake system.
@2500rpm VE is about 130%. Not happening in this universe at least.
@4850rpm VE is about 95%. From an 8v TDI? Whoever ported out your head is a living legend. At this point also there is no delay in boost pipe expansion etc to account for excess airflow, in fact boost is dropping.

According to MAF your peak flow is approx 700kg/hour and remains thereabouts from 3600rpm until 5061rpm.
To get that sort of flow plausible at 2750mbar your post intercooler air temperature would need to be about -5 degC which is.... implausible.

**Meat-Head** · 5th January, 2020, 07:25 PM

Originally Posted by DiegoStud

You must have an intercooler the size of a patio door sitting in a bath of LN2

As your off on one, for use leechers, can you tell us if the bath has to be cast iron or will
A regular plastic one do please? Can you tell us if the intercooler can be the
same thickness as a patio door, or does it need to fit the bath?

AWESOME post, although some DK members would not fully understand it.

thanks

**DiegoStud** · 6th January, 2020, 12:57 AM

What the bath is made of is unimportant, but the patio doors must be 1970s metal framed sliding ones not these small new cheap things with more plastic than glass.

**vwstuff** · 6th January, 2020, 08:54 AM

Will test a new MAF asap

**vwstuff** · 8th January, 2020, 05:49 PM

I'm still trying to find sig_qDIAScale_C for max iQ any idea ?!!
Through pressure test I found a leak when pipe mouving ...
I'm waiting for some parts .

I attached a pic of my new intercooler I guess, some body work is mandatory.
I just purchase a Metalwork for Craftsmen book for this purpose.

**DiegoStud** · 8th January, 2020, 07:25 PM

Nice pic, it would fit in a bath rather well

Well done finding the leak, your turbo will thank you for it.

If sig_qDIAScale_C is not 1C12AE then it's 1C12B6.

**vwstuff** · 9th January, 2020, 12:13 PM

I'm not sure for the two address stock formule ( 39 ) is b/256*a so factor is 255/70 =3.64
and both values for 1C12AE and 1C12B6 are 0.037

**DiegoStud** · 9th January, 2020, 03:48 PM

Yes but IQ values have a factor of 0.01 therefore 255/7000= 0.0364.
Why the original figure is 0.037 rather than 0.0364 is not a question to which I have found a satisfactory answer.

**Meat-Head** · 9th January, 2020, 08:34 PM

Originally Posted by DiegoStud

Yes but IQ ..........I have found a satisfactory answer.

Think you meant to say you have an iq higher than einstine, do you have the lottery numbers to hand

**vwstuff** · 16th January, 2020, 01:54 PM

So With no boost leak and new MAF : logs attached.
I tried to change MAF Formular from 19 to 8 with a = 80 to archive 2040 ( 0.1*a*b) with no succes .
I wonder if there is two UACC_ESBFormular_C maps ?! Formular 8 is NOT take into account by the ECU.
And also my iq is over 85 ....well some think is wrong

Will try to set both 1C12AE and 1C12B6 with same factor values ?
File attached

Albert IQ is 160 ...I'm stuck at 85 ?

**DiegoStud** · 17th January, 2020, 06:30 PM

Yes in your file you have two UACC_ESBFormular_C- 1941D8, 1F1CA8.

IQ stuck at 85- if you want to log more than 85 why have you only scaled until 85? Would not 100 with 0.0255 make more sense?
I wonder how wise it is to be trying to edit MAF and IQ diagnostic limits at the same time, sounds like you are losing track of what's going on. Modify one at a time, log and confirm.

With regards to the log itself- a little smokey maybe?
What would you like to know? Comparing Lambda to MAF well provides an empirical flow model for the engine. Do I think MAF is still high? Possibly so, and with a larger intercooler on the way the disparity will increase. However as I've already commented on, it's very difficult to try to analyse MAF data during heavy transient response, no single figure of expected MAF can be given to correlate with MAP unless you are willing to run simluations or plug the figures into some horrible equations (Heywood C14).
Considering the above and the fact the majority of the log covers a turbo spooling on an accelerating engine and the diagnostic air flow limitation occurs for just 2 seconds, the reason is clear why I'm not keen on MAF for smoke limitation purposes.

Energy conservation is more Newtonian than Einsteinian

**vwstuff** · 18th January, 2020, 01:52 PM

Thanks for UACC_ESBFormular_C
My car smoke visibly at 0.9
I don't plan to Inject more than 75-80 IQ
MAF is for testing airflow of my UGLY inlet manifold Prototype (build in process pict attached )

In fact I'm try to understand what is the best way to calculate smoke map and how to process ? I know i'm slow ....

And also I wish to archive a constant boost from 2000 to 5000 rpm at 2750 Mbars to lower final ergt.My goal is below 800 °C
I notice 2 maps 1EB4CE - 1EB716 and wonder if they act like a limiter or this is simply engine efficiency fail down ?

Speed of light being a constant, with time and length different… don’t ask Newtown about that