Ondonti
01-15-2023, 06:50 PM
I might post a video of this test I did.
Factory internals 3.0 12 valve. 1992 Diamante cams, 1990+ pistons (smaller skirt). Cast crank. Factory Rods.
8000 rpm limiter.
Valve springs from a 3.3L Chrysler, because valves were floating on the Dyno.
Fake "non turbo" setup.
Wastegate spring defeated to achieve zero boost. Intercooler piping disconnected to prevent boost.
2nd gear pull on 225/60r15 tires and a543 3.77 transmission.
This is base on multiple Datalogs from the Fueltech. There is always noise in RPM and MPH signals so its a "mental average"
Looking at this data like this, it would have been fun to record each gear.
Time in seconds for 500 rpms. Speed in MPH
3rd gear acceleration time for same MPH spread
2500-3000 ____ .75 ___ 26-32 ___ 3rd gear time
3000-3500 ____ .70 ___ 32-37 ___ .90
3500-4000 ____ .63 ___ 37-43 ___ 1.00 3500 to 4000 rpms tanks 1.25 seconds in 3rd gear
4000-4500 ____ .70 ___ 43-48 ___ 1.00
4500-5000 ____ .70 ___ 48-53 ___ 1.00
5000-5500 ____ .75 ___ 53-58 ___ .90
5500-6000 ____ .88 ___ 58-63 ___ .90
6000-6500 ___ 1.40 ___ 63-68 ___ 1.00
6500-7000 ___ 1.75 ___ 68-73 ___ 1.00
7000-7500 ___ 2.15 ___ 73-78 ___ 1.10
I stopped at 7500 because the sound while accelerating slowly is scary.
Power is dropping off, but also wind resistance and friction start hurting acceleration.
You can see that just above 6000 rpms I should shift from 2nd to 3rd. That lines up well with the OEM manual transmission 6200 rpm limiter.
Factory internals 3.0 12 valve. 1992 Diamante cams, 1990+ pistons (smaller skirt). Cast crank. Factory Rods.
8000 rpm limiter.
Valve springs from a 3.3L Chrysler, because valves were floating on the Dyno.
Fake "non turbo" setup.
Wastegate spring defeated to achieve zero boost. Intercooler piping disconnected to prevent boost.
2nd gear pull on 225/60r15 tires and a543 3.77 transmission.
This is base on multiple Datalogs from the Fueltech. There is always noise in RPM and MPH signals so its a "mental average"
Looking at this data like this, it would have been fun to record each gear.
Time in seconds for 500 rpms. Speed in MPH
3rd gear acceleration time for same MPH spread
2500-3000 ____ .75 ___ 26-32 ___ 3rd gear time
3000-3500 ____ .70 ___ 32-37 ___ .90
3500-4000 ____ .63 ___ 37-43 ___ 1.00 3500 to 4000 rpms tanks 1.25 seconds in 3rd gear
4000-4500 ____ .70 ___ 43-48 ___ 1.00
4500-5000 ____ .70 ___ 48-53 ___ 1.00
5000-5500 ____ .75 ___ 53-58 ___ .90
5500-6000 ____ .88 ___ 58-63 ___ .90
6000-6500 ___ 1.40 ___ 63-68 ___ 1.00
6500-7000 ___ 1.75 ___ 68-73 ___ 1.00
7000-7500 ___ 2.15 ___ 73-78 ___ 1.10
I stopped at 7500 because the sound while accelerating slowly is scary.
Power is dropping off, but also wind resistance and friction start hurting acceleration.
You can see that just above 6000 rpms I should shift from 2nd to 3rd. That lines up well with the OEM manual transmission 6200 rpm limiter.