Durametric Log / Calculate AFR and Duty Cicle - High Values
#1
07-04-2012 | 08:32 AM
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Durametric Log / Calculate AFR and Duty Cicle - High Values
Hi,
After install the new air intake my tuner did some mods in the software.
I did a log with durametric during some gears (3/4/5/6) and next I calculated the AFR and Duty Cicle
Formulas used:
AFR = Oxygen sensing bank 1 Lambda Value x 14.7
Duty Cicle = (injector time)*(RPM)/1200
Some times the AFR is 5 and duty cicle much more than 100%.
Please can you help me understand these values.
Log in attach.
After install the new air intake my tuner did some mods in the software.
I did a log with durametric during some gears (3/4/5/6) and next I calculated the AFR and Duty Cicle
Formulas used:
AFR = Oxygen sensing bank 1 Lambda Value x 14.7
Duty Cicle = (injector time)*(RPM)/1200
Some times the AFR is 5 and duty cicle much more than 100%.
Please can you help me understand these values.
Log in attach.
#3
07-04-2012 | 12:43 PM
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With the actual log values my engine is in danger?
If I replace the socks injectors to another's with more capacity, I should stay with 5 bar?
With bigger injectors I have to retune the car?
How about the duty cycle, at the log we can see 5 times values up to 100% (108%; 114%; 115%, 117% and 148%
).Thanks,
VS
#5
07-04-2012 | 03:50 PM
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Should I reduce the wastegate open point (actual 14PSI) to 12 PSI to try equal or reduce the gap between the setpoint boost to actual boost?
#6
07-05-2012 | 09:58 AM
if your setpoint is lower then actual, gates are too tight, that will cause the limp mode issues you have been having.
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#TeamAIM
997TT SilverSpool - 210.8 mph 1/2 Mile WR Apr 2019, 9.2 @ 168 mph 1/4 Mile Manual World Record , 3.15 60-130 mph , 2.72 100-150 mph , 1400whp E85
996TT SpoolBus - 204.6 mph 1/2 Mile 996TT WR Aug 2018, 9.5 @ 154 mph, 3.23 60-130 mph, 2.5 100-150 mph Manual Porsche World Record, 1400whp E85
997TT SlowBerry - 205.0 mph 1/2 Mile WR Nov 2018, 9.7 @ 170 mph 1/4 Mile , 3.2 60-130 mph , 2.4 100-150 mph , 1420whp E85
ESMOTOR | DO88 | TPC DSC | SYVECS | COBB | IPD | KLINE | XONA | AMS | ID | ERP | SACHS | TURBOSMART | CSF | DODSON |
#7
07-05-2012 | 10:31 AM
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It´s normal have differences between these values.
Please, see my log and tell me if my engine is in danger.
Thanks,
VS
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#8
10-07-2012 | 01:33 PM
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your AFR's scare me. On the first run at max load your afr's are very high. Then on the high rpm run, they are high as well, but are also all over the place. Definitely either injector/fpr issue or tuning issue or both. I think your lambda should be around .83 or less for safety sake.
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