Hey kids,
I've noticed a substantial discrepancy between the Gearing Commander and real world data for my machine.
'89 GSX 1100F
Gearing Commander has this bike in their database so all stock specs can be auto-filled.
I've confirmed that all the data actually matches my machine:
Tire sizes (and with minimal wear) - check
Final drive gearing 15/52 - check
The transmission driver/driven gear ratios filled in by the software has been checked against stock spec.
Discrepancy:
Gearing Commander claims these mphs @ rpms:
5000 rpm @ 79
5500 rpm @ 86
6000 rpm @ 94
My GPS claims this:
5000 rpm @ 70 - (smooth engine)
5500 rpm @ 76
6000 rpm @ 82 - (noticeable engine vibrations)
My end goal is to smooth out the engine at approx 80 mph (my highway cruise speed) - this would require dropping about 1000 rpms!
I'd have to use at least a 16/45 final drive to hit that 19% rpm decrease.
I'd think that first gear from a stop would be pretty painful to the clutch considering the weight of this pig.
Something is WAY off here.
If Gearing Commander can be trusted then is it possible that a former owner messed with the gear ratios in the transmission?
Questions:
1) Why such a big discrepancy?
2) Assuming the above cannot be solved is a 1000 rpm drop too tall an order on this never-gonna-race-the-Isle-of-Man land yacht?
3) Anyone else wish they'd thrown in a 6th gear?
Keep'in it Suzi-fresh in New England
J
I've noticed a substantial discrepancy between the Gearing Commander and real world data for my machine.
'89 GSX 1100F
Gearing Commander has this bike in their database so all stock specs can be auto-filled.
I've confirmed that all the data actually matches my machine:
Tire sizes (and with minimal wear) - check
Final drive gearing 15/52 - check
The transmission driver/driven gear ratios filled in by the software has been checked against stock spec.
Discrepancy:
Gearing Commander claims these mphs @ rpms:
5000 rpm @ 79
5500 rpm @ 86
6000 rpm @ 94
My GPS claims this:
5000 rpm @ 70 - (smooth engine)
5500 rpm @ 76
6000 rpm @ 82 - (noticeable engine vibrations)
My end goal is to smooth out the engine at approx 80 mph (my highway cruise speed) - this would require dropping about 1000 rpms!
I'd have to use at least a 16/45 final drive to hit that 19% rpm decrease.
I'd think that first gear from a stop would be pretty painful to the clutch considering the weight of this pig.
Something is WAY off here.
If Gearing Commander can be trusted then is it possible that a former owner messed with the gear ratios in the transmission?
Questions:
1) Why such a big discrepancy?
2) Assuming the above cannot be solved is a 1000 rpm drop too tall an order on this never-gonna-race-the-Isle-of-Man land yacht?
3) Anyone else wish they'd thrown in a 6th gear?
Keep'in it Suzi-fresh in New England
J
Comment