What RPM would you shift based on this dyno graph ?

[deanm11]

1. Determine max safe rpm / including possible valve float issues on stock spring. Greater issue on forced induction cars.
2. Plot Torque x GEAR RATIO
3. Shift to maximize #2, subject to #1.
4. Possibly adjust if near finish line / etc.

Almost nobody remember to torque gear ratio/torque multiplication into account. When you do, hanging in gear at lower torque available than shifting up can be worth it.

Sponsored

 

[Unas2k5]

I believe my fuel injectors are the id1000

 

[engineermike]

If you plot acceleration as a function of torque, gear, and speed then you would shift when the curves intersect, as per @deanm11 . I did this but also included the SAE correction for mass equivalence and got the following graph:

I had to extrapolate a torque at 8000 rpm and estimated it to be 500 ftlb, but the graph shows you pretty much have to shift at 8000 in order to maximize acceleration, even higher for 1-2 and 2-3. This also assumes the gear ratios posted by Shadesofbloo are correct.

Did you say you had upgraded OPG?

 

[Unas2k5]

Yes upgraded OPG and sprocket

 

[Unas2k5]

Maybe I should upgrade the bead unit? It’s 2k to go from P1x to D1x would that be worth it ?

 

[illtal]

Why not fa94 that thing.... Low compression you can probably do 30+ psi. But you will likely need more injector.

 

[Unas2k5]

Lol as long as I’m under 5 seconds in a 60-130 I’m happy

 

[80FoxCoupe]

I'd shift that setup at 8k

 

[NightmareMoon]

If you plot acceleration as a function of torque, gear, and speed then you would shift when the curves intersect, as per @deanm11 . I did this but also included the SAE correction for mass equivalence and got the following graph:

I had to extrapolate a torque at 8000 rpm and estimated it to be 500 ftlb, but the graph shows you pretty much have to shift at 8000 in order to maximize acceleration, even higher for 1-2 and 2-3. This also assumes the gear ratios posted by Shadesofbloo are correct.

Did you say you had upgraded OPG?

Yep, this is the graph you need to make for your own car, and this is why its rarely a good idea to short shift. Generally, the drop in gear ratio from the higher gear usually is a bigger loss than the torque lost from riding high into the RPM range past the torque peak.

If your gears are super closely spaced, and your torque past some RPM really falls off a steep cliff, then you might short shift.

 

[Unas2k5]

If you plot acceleration as a function of torque, gear, and speed then you would shift when the curves intersect, as per @deanm11 . I did this but also included the SAE correction for mass equivalence and got the following graph:

I had to extrapolate a torque at 8000 rpm and estimated it to be 500 ftlb, but the graph shows you pretty much have to shift at 8000 in order to maximize acceleration, even higher for 1-2 and 2-3. This also assumes the gear ratios posted by Shadesofbloo are correct.

Did you say you had upgraded OPG?

I didn’t notice it was you. Thanks for your input. So I should shift at 8k? Idk how to make a graph like that. I can’t imagine it hooking at 1-2 I’m most likely just going to test it out at 40 and 60 to 130 rolls

 

[Unas2k5]

I'd shift that setup at 8k

Ok thanks. What gear would you be in if you were doing a 60 roll?

 

[engineermike]

Yep, this is the graph you need to make for your own car

That IS for his car.

 

[engineermike]

I didn’t notice it was you. Thanks for your input. So I should shift at 8k?

If you’re sure the engine and supercharger can mechanically take it then that’s what I would do. You do have opg and upgraded springs so it appears to be built for it. I don’t know the max sc rpm but you might check that as well.

 

[Unas2k5]

If you’re sure the engine and supercharger can mechanically take it then that’s what I would do. You do have opg and upgraded springs so it appears to be built for it. I don’t know the max sc rpm but you might check that as well.

Ok thanks. I know Brenspeed contacted Procharger to figure out what the max is. I’m gonna double check with Procharger. I think they may have a calculator for it on their site actually.
https://performanceparts.ford.com/part/M-6513-M50BR
These are the valve springs it does say 8000RPM capable.

 

[Unas2k5]

I heard these springs come in the Gen 2 stock as well

Sponsored