Want to run 9.90

[jlundy]

Originally Posted by Lenny5160

Explain what you'd like the shifts to look like.

Do you want the car to shift while it is coasting on the throttle stop, then shift a second time downtrack at wide open throttle?

Do you want to launch hard, then go on the throttle stop, back wide open while still in first gear and shift twice down the track at wide open throttle?

Does your ignition system have the ability to control the shifts, or must the delay box control it?

Launch hard then go on the stop, then shift down track.


Ignition can not control shifts, just delay box or separate shift controller

[Lenny5160]

If you want both of your shifts to happen by RPM, you can absolutely do that. No issue.

[jlundy]

Originally Posted by Lenny5160

If you want both of your shifts to happen by RPM, you can absolutely do that. No issue.

Thank you Lenny for the help.


I just purchased the Pro Cube with 3 timers and ZForce from K&R so I'll let the box shift it on time.


Jeff

[Lenny5160]

I just purchased the Pro Cube with 3 timers and ZForce from K&R so I'll let the box shift it on time.

Seems less than ideal, if I'm understanding it correctly. If you want the shifts to happen down track at wide open throttle, the time setting for your desired RPM will change every time you change your throttle stop time. You'd be better off using RPM as the shift trigger.

[jlundy]

Originally Posted by Lenny5160

Seems less than ideal, if I'm understanding it correctly. If you want the shifts to happen down track at wide open throttle, the time setting for your desired RPM will change every time you change your throttle stop time. You'd be better off using RPM as the shift trigger.

As I mentioned in my first post, it's painfully obvious that I have no clue what I'm doing. That really is the main reason I joined this forum, to read and ask questions.


I guess I need to shift into 2nd on the stop then coming off the stop say 7000 rpm = time? shift into 3rd for the remainder of the run. Thought time was more consistent than RPM?


I thank you Lenny for taking the time to help this racer whom thought he'd have a go at electronics racing.

[Hacksaw]

What about getting it to shift to high gear when your on the stop? Wouldn't that be the most consistent? Thinking you would need a little down track speed but your really fooling the car to think it has a PG trans.

[Lenny5160]

How fast does the car run wide open? That will influence the options you have. As Hacksaw mentioned, you can go all the way to High gear while on the stop, but you probably want to be a full second quicker than the index (say a 8.90 or quicker car when trying to run 9.90) to pull that off. I get the feeling that your car isn't that quick.

I've never run a 3-speed, but here's what I think I would do in your situation. I'd launch the car hard, then put it on the throttle stop. Have your shifter hooked to a timer which would put the car in 2nd gear shortly after the throttle stop turns on. When the car goes wide open again, I'd either have some way to put the car in 3rd based on RPM or just shift it by hand at the desired RPM.

[jlundy]

Originally Posted by Hacksaw

What about getting it to shift to high gear when your on the stop? Wouldn't that be the most consistent? Thinking you would need a little down track speed but your really fooling the car to think it has a PG trans.

That could work. 1, 2 shift........On stop, come off in high gear. What kind of shock to the converter would that be if any?