Hi Gents
I did some 3 gear pulls and logged actual values, the car is running 99 ron fuel,K16 turbos, 9ff exhaust with a euro tuner tune. I am not sure that the tune is correct.

input appreciated.
Regards Rob

 

Looks pretty good - 1.0 bar max, injector duty cycles around 86% max. AFR's down around 11.7-8.

It would be nice to also log "Engine Load" at the same time. If you plot load vs rpm, you get a poor man's dyno curve. You don't know the actual value, but you can get relative numbers. You can compute hp as Load*RPM*pi/16,500, still also a relative number.

 

Hi Fast Fwd,

I'm still playing with my new durametric. Could you please tell me how you worked out the AFR from the log shown. I can see the Lambda readings. What do you do with them to convert. Also how did you work out the inj duty cycle.
Cheers,
Frank

 

Hi, Frank,

AFR = 14.7*Lambda
(14.7 is stoichiomeric ratio for air / gasoline)

Duty cycle = Injector time * RPM / 1200
(time ms)*(0.001 s/ms)*(RPM rot/min)*(1/60 min/s)*(1/2 intake/rev)*100%

Bar = (Boost - ambient pressure)/980

I wish I knew how to convert Durametric load (or torque) to ft-lbs... I asked Durametric and they said they don't know - they just report what the ECU tells them.

Jon

 

Thanks for the input, Jon.
I will try to do some runs this weekend.

 

Cheers Jon
Frank

 

Most of the maps are set up in RPMs vs. engine load.... that goes for corrected afrs, target afrs, the 4 ignition maps... ironically some of the boost maps are rpms vs engine temp... thats kinda odd but oh well thats the Germans.. lol...

here is a sample... stock 996 target AFrs... RPM vs. engine load...


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Marksi I cant see the sampel!

 

Hi Markski,
I cant either, just a red cross.
Frank

 

If the datalog shows 2304 as boost, do you subtract 980? 2304 - 980 = 1324 or 1.324 bar?

 

No you take boost 2304-ambient pressure / 980
In my case average boost (1920 - 1008) / 980 = 0.93 bar

 

The boost reported is in mm of Hg. To correct for the ambient conditions, subtract the reported boost pressure at idle. In Rob's dataset, that was 1008.5. To convert to bar, divide by 980 mm Hg, which is the definition of 1 bar.

Bar = (Boost pressure of sensor - Boost pressure at idle)/980

Jon

 

I can't see those data either. I didn't get a baseline for my car before it was modded. I'd really like to see that dataset. I suppose that one could convert the engine load to advertised torque from Porsche to get a dimensional number.

Jon

 

Sorry does this work?



And here is a ignition map....

 

Well, I can sort of read it, but I'm not sure what it means.

If you could post a Durametric output of Engine Load vs. RPM in stock trim, I'd really appreciate it.

Thanks,

jon