View Poll Results: Is your 1st gear boost same/similar to higher gears? (please keep the voting honest)
No stage 1 - same/similar psi in all gears
0
0%
Stage 1 - same/similar psi in all gears
5
38.46%
No stage 1 - significantly less psi in 1st gear
0
0%
Stage 1 - significantly less psi in 1st gear
8
61.54%
Voters: 13. You may not vote on this poll
Is your 1st gear boost same/similar to higher gears?
04-15-2011, 07:19 PM
#11
Senior Member
Join Date: 11-15-2008
Location: Newburgh, NY
Posts: 1,599
Exactly. And also temperature. Cold air exhibits more molecular density than warm air, which really equates to more fuel delivery (air in essence is a significant component of fuel).
04-16-2011, 10:27 AM
#12
Senior Member
Thread Starter
Join Date: 01-04-2010
Location: Imported from Detroit
Posts: 1,584
However that doesn't cloud the issue in the fact that first gear isn't producing the same power as second and higher.
Here is something I found from a GM Engineer on the Upgrade kit.
#1 The upgrade kit does not do anything under 2500 RPM. This is to maintain the engine life. The manual transmissions have been reported to fracture the case due to excessive wheel hop. The upgrade kit does not change the transmission calibration in any way.
#2 Power is peaking at 4800 to 5100 rpm. The trans cal is made to take advantage of the torque curve.
#3 There is no difference in the calibration for the decel enleanment. Throttle position is what is used to shut the fuel off.
Either way PSI means little as that is not an indicator of power going to the wheels.
Note even on the no lift shift the PSI stays up but the power is not going to the wheels when you clutch it. Engine management is in effect in first geat and limits power to the wheels. This is why second gear is the one that has the most pull.
First the tranny would not last much with full power in first gear and second FWD cars have enough issues hooking up with the weight transfer. You take off hard the front wheels unload.
Few of us know what the management programs really do as GM rarely speaks on them in detail. Either way the trannys in the HHR were never intended for this much power and are very well protected. Just don't judge the power by the PSI as odds are it is not all going to the wheels.
#1 The upgrade kit does not do anything under 2500 RPM. This is to maintain the engine life. The manual transmissions have been reported to fracture the case due to excessive wheel hop. The upgrade kit does not change the transmission calibration in any way.
#2 Power is peaking at 4800 to 5100 rpm. The trans cal is made to take advantage of the torque curve.
#3 There is no difference in the calibration for the decel enleanment. Throttle position is what is used to shut the fuel off.
Either way PSI means little as that is not an indicator of power going to the wheels.
Note even on the no lift shift the PSI stays up but the power is not going to the wheels when you clutch it. Engine management is in effect in first geat and limits power to the wheels. This is why second gear is the one that has the most pull.
First the tranny would not last much with full power in first gear and second FWD cars have enough issues hooking up with the weight transfer. You take off hard the front wheels unload.
Few of us know what the management programs really do as GM rarely speaks on them in detail. Either way the trannys in the HHR were never intended for this much power and are very well protected. Just don't judge the power by the PSI as odds are it is not all going to the wheels.
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