MAF value = Horsepower potential
04-17-2019, 07:09 PM
#211
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Thread Starter
At least the rod didn't let go !!!
04-17-2019, 08:09 PM
#213
Rennlist Member
Thread Starter
yea, I play the odds !!
04-24-2019, 05:20 PM
#214
Rennlist Member
All the data comes straight from the DME over OBDII protocol. I don't care which bluetooth adapter/app/OS you use, use the one you are most familiar with or have on hand. As long as the MAF, temps, altitude,ect. can be retrieved.
You can even use Durametric over the Porsche protocol, but it is a LOT more cumbersome with the cable/laptop and all.
When I go on long trips or just spirited drives and "hooligan runs" with my Porsche buddys, I have my phone mounted and Torque app running for additional gauges and info I can easily flip through to keeps tabs on everything..I usually monitor fuel trims, 02 sensors, MAF, IAT, and coolant temp since the dash gauge is so inaccurate, and I have a separate oil temp gauge.
You can even use Durametric over the Porsche protocol, but it is a LOT more cumbersome with the cable/laptop and all.
When I go on long trips or just spirited drives and "hooligan runs" with my Porsche buddys, I have my phone mounted and Torque app running for additional gauges and info I can easily flip through to keeps tabs on everything..I usually monitor fuel trims, 02 sensors, MAF, IAT, and coolant temp since the dash gauge is so inaccurate, and I have a separate oil temp gauge.
04-24-2019, 05:33 PM
#215
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Thread Starter
Yes, for Durametric, select actual values, then select RPM, Mass Air flow, and IAT, then select LOG in the top right, then start. Then do a pull to red-line in 3rd gear if you have the road/room, or 2nd gear if 3rd is not possible. Then press stop. You can go through the log and find the max-MAF value along with the RPM and intake temp. Will also need the ambient temp, and your altitude to do corrections, most GPS's have altitude, and the baro/humidity really don't effect much using the MSA correction.
04-24-2019, 05:40 PM
#216
Rennlist Member
Yes, for Durametric, select actual values, then select RPM, Mass Air flow, and IAT, then select LOG in the top right, then start. Then do a pull to red-line in 3rd gear if you have the road/room, or 2nd gear if 3rd is not possible. Then press stop. You can go through the log and find the max-MAF value along with the RPM and intake temp. Will also need the ambient temp, and your altitude to do corrections, most GPS's have altitude, and the baro/humidity really don't effect much using the MSA correction.
05-10-2019, 04:56 AM
#218
which value i should take in Durametric? Do I need some recalculation? Did not log the rpm though
I measured a max air flow of 258.3 kg/hr Is this equivalent to the so called g/s value you measured in your Torque app?
Anyway my testing conditions
Did now 3 runs all around the same value: 256, 258, 262
Measured in 3rd gear
Ambient temp 13.5°C (56F)
Air Intake Temp 17°C (62F)
barometric pressure 1008.5 hPa (756 mmHg)
Alt: -3m under sea level (-10ft)
Rel Humidity: 65%
Car is a 2002 996 C2 3.6 with 124.000miles
Intake mods: IPD intake plenum, hot AOS vent line relocated to airbox
exhaust mods: 200 cell Top Gear cross-over cats; Cargraphic Sound mufflers
I measured a max air flow of 258.3 kg/hr Is this equivalent to the so called g/s value you measured in your Torque app?
Anyway my testing conditions
Did now 3 runs all around the same value: 256, 258, 262
Measured in 3rd gear
Ambient temp 13.5°C (56F)
Air Intake Temp 17°C (62F)
barometric pressure 1008.5 hPa (756 mmHg)
Alt: -3m under sea level (-10ft)
Rel Humidity: 65%
Car is a 2002 996 C2 3.6 with 124.000miles
Intake mods: IPD intake plenum, hot AOS vent line relocated to airbox
exhaust mods: 200 cell Top Gear cross-over cats; Cargraphic Sound mufflers
Last edited by Silk; 05-10-2019 at 05:42 AM.
05-10-2019, 05:37 PM
#219
Rennlist Member
Thread Starter
which value i should take in Durametric? Do I need some recalculation? Did not log the rpm though
I measured a max air flow of 258.3 kg/hr Is this equivalent to the so called g/s value you measured in your Torque app?
Anyway my testing conditions
Did now 3 runs all around the same value: 256, 258, 262
Measured in 3rd gear
Ambient temp 13.5°C (56F)
Air Intake Temp 17°C (62F)
barometric pressure 1008.5 hPa (756 mmHg)
Alt: -3m under sea level (-10ft)
Rel Humidity: 65%
Car is a 2002 996 C2 3.6 with 124.000miles
Intake mods: IPD intake plenum, hot AOS vent line relocated to airbox
exhaust mods: 200 cell Top Gear cross-over cats; Cargraphic Sound mufflers
I measured a max air flow of 258.3 kg/hr Is this equivalent to the so called g/s value you measured in your Torque app?
Anyway my testing conditions
Did now 3 runs all around the same value: 256, 258, 262
Measured in 3rd gear
Ambient temp 13.5°C (56F)
Air Intake Temp 17°C (62F)
barometric pressure 1008.5 hPa (756 mmHg)
Alt: -3m under sea level (-10ft)
Rel Humidity: 65%
Car is a 2002 996 C2 3.6 with 124.000miles
Intake mods: IPD intake plenum, hot AOS vent line relocated to airbox
exhaust mods: 200 cell Top Gear cross-over cats; Cargraphic Sound mufflers
Anyway 262g/s / .75 = 349.33 MHPP
Since your IAT is at 62F and altitude is -10ft with 65% humidity the correction is 1.016
349.33 x 1.016 = 354.92 MHPP (corrected)
05-12-2019, 04:17 PM
#220
Are you sure the units in torque app are right?
Just curious... where does the 0.75 factor come from.
I am not that an expert.
i would not mind a more scientific explanation. I am an (metallurgic) engineer so no problem with that.
I used the website you mentioned; it gave me a correction factor of 0.95 what do we do different (did you notice the inchHg vs mmHg)
to be conservative I would use the koerst value
Just curious... where does the 0.75 factor come from.
I am not that an expert.
i would not mind a more scientific explanation. I am an (metallurgic) engineer so no problem with that.
I used the website you mentioned; it gave me a correction factor of 0.95 what do we do different (did you notice the inchHg vs mmHg)
to be conservative I would use the koerst value
05-12-2019, 05:03 PM
#221
Rennlist Member
Thread Starter
Are you sure the units in torque app are right?
Just curious... where does the 0.75 factor come from.
I am not that an expert.
i would not mind a more scientific explanation. I am an (metallurgic) engineer so no problem with that.
I used the website you mentioned; it gave me a correction factor of 0.95 what do we do different (did you notice the inchHg vs mmHg)
to be conservative I would use the koerst value
Just curious... where does the 0.75 factor come from.
I am not that an expert.
i would not mind a more scientific explanation. I am an (metallurgic) engineer so no problem with that.
I used the website you mentioned; it gave me a correction factor of 0.95 what do we do different (did you notice the inchHg vs mmHg)
to be conservative I would use the koerst value
The .75 factor is a conversion from thermal energy to mechanical energy, it was not achieved easily. You can try to do your own if you want, but this factor is very good for our engines, and the best I could do.
Did you use this calculator for weather corrections? http://www.wallaceracing.com/weather-corr.php
What do you mean by "koerst value"?
Last edited by Porschetech3; 05-13-2019 at 05:15 PM.
01-07-2020, 02:25 AM
#222
Rennlist Member
I see this thread has been quite for months, but I just had to chime in. I just got Torque Pro ($5) and an $11
off Amazon, and am thrilled with the data available. Can't wait to run the MAF tests on my stock '99 996. I read this entire thread from top to bottom, and appreciate all the guidance here.
Can anyone tell me if Torque Pro can run cam deviation?
Can anyone tell me if Torque Pro can run cam deviation?
01-07-2020, 04:21 PM
#223
Rennlist Member
Thread Starter
I see this thread has been quite for months, but I just had to chime in. I just got Torque Pro ($5) and an $11 bluetooth dongle off Amazon, and am thrilled with the data available. Can't wait to run the MAF tests on my stock '99 996. I read this entire thread from top to bottom, and appreciate all the guidance here.
Can anyone tell me if Torque Pro can run cam deviation?
Can anyone tell me if Torque Pro can run cam deviation?
I love gauges !!
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Gingerman (01-07-2020)
01-07-2020, 04:40 PM
#224
Rennlist Member
What is my cheapest means of measuring/monitoring cam deviations?
Have you thought about an Android tablet mounted on center console?
I have been wanting to do a Double Din head unit for additional gauges with Bluetooth/Torque Pro, but still on the fence on that one.
I love gauges !!
I love gauges !!
01-07-2020, 05:01 PM
#225
Rennlist Member
Thread Starter