Power-Torque Curve of my '21 GT4 by Cobb AccessPort
#1
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Power-Torque Curve of my '21 GT4 by Cobb AccessPort
Recently acquired a Cobb AccessPort AP3-POR-015 which comes with a rather comprehensive data logging feature.
Collected some performance data of my '21 GT4 (w/ Soul Valved Exhaust + OAP and BMC Air Filter) following the vendor instructions and got some pretty interesting/impressive results. This being my first attempt not sure how reliable the data is, nevertheless thought it was worth sharing. A somewhat surprising observation is the recorded peak torque of 371 ft-lb at ~3k RPM compared to the Cobb map notes (Stage1 Octane 93) with peak at 314 ft-lb at 4.8k RPM. The full list of AP loggable items may be found here. Your thoughts are always welcome. Thanks and Happy New Year!
Collected some performance data of my '21 GT4 (w/ Soul Valved Exhaust + OAP and BMC Air Filter) following the vendor instructions and got some pretty interesting/impressive results. This being my first attempt not sure how reliable the data is, nevertheless thought it was worth sharing. A somewhat surprising observation is the recorded peak torque of 371 ft-lb at ~3k RPM compared to the Cobb map notes (Stage1 Octane 93) with peak at 314 ft-lb at 4.8k RPM. The full list of AP loggable items may be found here. Your thoughts are always welcome. Thanks and Happy New Year!
Last edited by howardchen416; 01-01-2024 at 11:26 AM.
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alwaysdriving (01-04-2024)
#2
I could have measured between stock and then the Flat 6 OAP's.
The Cobb tune will ruin your gas mileage, because you'll always have your foot in it.
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#8
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Actually, I was surprised by the recorded peak torque (371 ft-lb at 3k RPM) and power (446 HP at 7k RPM) figures as they appear optimistic compared to other published 718 GT4 numbers.
#9
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Yeah, those numbers appear to be all gooned up…especially the TQ both peak and range.
#10
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Tend to agree except these numbers appear to be direct readings from the ECU through the OBD interface and not interpreted by the AP device. Isn't that the same way these numbers are retrieved during a dyno session?
Last edited by howardchen416; 01-01-2024 at 11:36 AM.
#11
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There is a HP/TQ graph back of your OM. Think peak TQ of 309/317 plateaus much higher
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howardchen416 (01-01-2024)
#12
Third gear is surprising to me. The third gear ratio is 1.41 to 1. So you will have some mechanical advantage in your data. I would have thought that fourth gear at 1.13 to 1 is the one you would use.
Nevertheless, I was really impress with the power gain I felt when I installed the Cobb tune in my gt4.
Nevertheless, I was really impress with the power gain I felt when I installed the Cobb tune in my gt4.
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howardchen416 (01-02-2024)
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Larry Cable (01-01-2024)
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howardchen416 (01-02-2024)