Flat shift

[skylinegtrhr]

Any chance to modified FW and use clutch switch for flat shift function?

[Matt]

In most cases, there is a method of cutting the ignition and/or fuel delivery, in a similar fashion to a rev-limiter, which prevents the engine from over-revving when the load from the transmission is removed.

This should be possible. I would have to add an option for flash shift, and when the clutch switch (power steering line which is reused) is pushed in the fuel is cut (by forcing use of the rev limiter)

[skylinegtrhr]

thanks Matt
please include it on yours "to do " list , it's big help to us circuit enthusiast

[adamky]

So, what's the real difference between the settings that you would use for a launch control "2 step" rev limiter and flat shift? Can't you just set your launch control up to only be based on clutch switch input and not based on speed and accomplish the same thing as flat shift? So under WOT, you would keep the throttle floored, hit the clutch and the lower rev limiter used for lauch should kick in, right? Or maybe not?

[Matt]

At the moment, LC is only activated either by

(a) default (speed = 0) and cancelled when speed = set amount (or)
(b) clutch in under 1200rpm (enable) and then clutch over this amount to disable

I've marked for improvements here:
http://www.nistune.com/mantis/view.php?id=163

[adamky]

So, I'm just trying to figure out some possible options here with the existing launch control. Granted I haven't even tried it yet as my car has been on jackstands for 5 months. But let's say I do the following:
1. Set my launch control fuel cut and ignition retard up
2. Turn the speed at which launch control activates all the way up to the max speed allowed (255, I'm guessing?)
3. Connect the clutch switch to the power steering pin on the ECU
4. Wire an on/off switch between the clutch switch and ECU power steering pin.

This way, I could keep the launch control off for driving around town. But at the track, I could flip the switch, which should engage the launch control any time the clutch is fully depressed. This would not only engage it on launch, but could also be used as flat shift (no lift to shift), since every time the clutch is pressed, launch control rev limits would kick in, regardless of speed. Is my thinking flawed here? Is there a reason that this wouldn't work?

***EDIT: I see where you mentioned 1200 rpm as a factor to engage LC. If this criteria for LC was removed, would my idea work?

[Matt]

Yeah it would work, but I would need to update the code

[adamky]

Thanks, Matt. I just came back to the forums after a long hiatus and am just now learning about all of the new options in the feature pack. Fan control and launch control were the 2 things I've been looking forward to for years. Awesome stuff!

[adamky]

Oh, and if you want to start with S13 KA24DE, that would be okay, I guess.

[Matt]

Once I make changes to the SR20 base code, it will roll though all other models

[skylinegtrhr]

Hi Matt any news about flat shift?

[adamky]

Ditto. I've been checking this thread every couple of weeks to see if there any updates. Please please please make this happen!

[Matt]

Sorry but it wont be happening for a few months

The existing workload I'm only just keeping my head above water with existing support work.

During this I am updating the new website and shopping cart since the current one will break in September when paypal move to SSL only. After this I need to finish up the testing for the existing feature pack and release that.

[skylinegtrhr]

Hi Matt
so again any news about this?

[Matt]

Nothing at this time. I've been focusing on the newer models and moving workshop over the last 12 months