Flat Shift Switch:

This input does not operate in conjunction with any
output. It is used by the ECU to retard ignition timing
by 15, allowing the throttle to be held wide open
whilst changing gears. This reduces engine deceleration
so gear changes will be quicker, but it also prevents the
engine from over-revving when the clutch is
disengaged. The driver normally depresses the switch
just as they are going to disengage the clutch and then
releases the switch just after the clutch is re-engaged.
The driver can therefore keep the throttle wide open
throughout the gear change.

Anyone using this on there 7?

 

this would be a useful option if you had a dog ring type gear box. if you use the clutch retarding the ignition will not keep it from over reving. once the load is removed the engine will over rev. with a dog ring gear box you can shift without the clutch so retarding the ignition will unload and slow the engine enough to make the shift without lifting off the throttle. this is very common on road race motorcycles. they install a microswitch on the shifter and as soon as it moves the engine kind of pauses and allows the gear change to occur without damage and with out getting out of the throttle. If you have a Jerico, Lenco , G-force or similar gearbox you could use this option, but with a synchro box it will be hard to take advantage of this option.

 

Coulden't you just hook it up to your clutch switch then plumb a "master" switch in series that controls if the feature is on or off?

I guess my main question is if there are negatives to this? This sounds like it would be a great option to use if you have a large turbo or if you drag raced.

 

it would have to be connected to the shifter not the clutch, since you would not be using the clutch. this is the real trick part of this feature. all you would do would be to move the shifter to the next gear and the ECU would do the rev matching for you. no clutch and no lifting of the throttle. this is very common on pro level race cars especially in drag racing(pro stock and very trick bracket cars) and motor cycle road racing. formula type race cars use even more high tech by using an electric solenoid or air pressure to move the shift linkage thus all you have to do is push a button to make the shift. if you are good with the rev matching you can do this yourself without the computer. the trick is having the proper type of gearbox to accomplish the job

 

You can use the feature on your 7 if you would like. I used it for at least 6 months. The new firmware lets you use the flat shift feature, but it is not necessary to have it to use the feature. You need to set the Aux RPM in the input/output page. Then go to the main setup page and set the Aux RPM to an RPM that is lower than what you end up at after a shift (ie 4,500RPM). Then connect the positive wire on the spare A/D harness to one side of the clutch switch and the input of the spare A/D to the other side of the clutch switch.

With it hooked up this way when you push the clutch pedal down at an RPM higher than the set RPM (ie 4,500RPM) it will cut the ignition signal and allow you to keep WOT. You will not come off boost, you will not hear your BOV and you will not have that slight pause during shifting.

It is something that is common among drag racers and can be down without the E6K if needed. Just hope you have a decent clutch.

 

Wait so you do use the clutch or don't use the clutch w/ this?

 

It depends on the application. since I don't do any drag racing I don't know some of the tricks of the trade. styk33 uses the feature with the clutch to keep the boost up during 1/4 mile runs, I would agree that the clutch would take a beating used this way. I would like the feature so I could do clutchless upshifts and down shifts like modern formula cars. basicly just moving the shifter and the computer helps to match revs so the clutch is not used. this would also require a dog ring synchro gearbox. I am currently looking at using a Jerico on my new road race turbo II.

 

Fully clutchless does not require this feature since you never lift the throttle or depress the clutch to shift. Now in a semi or full clutch type tranny this might help although with my tranny which is semi-clutchless only requiring very slight clutch engagement for gear release, during shifting my boost never drops!

crispeed
87TII
9.20@150mph