If you don't have to use the clutch during shifts then it is a piece of cake. Just run a line from shifter button to burnout chip and line lock. For the clutch button I use the Biondo TBB-SA snap action. Then run another line from this button to launch chip. On MSD boxes, Launch chip works over the Burnout chip if both are active at the same time so you can be holding the clutch AND shifter button (to keep line lock active), but the only rev limiter working at that moment is Launch. No relay needed here if you are willing to dump clutch and release shifter button simultaneously on a launch.
If you
do have to use the clutch during shifts then go with the exact diagram that alan roehrich posted because that is how I have mine. It requires the button on the shifter which powers the linelock and burnout rpm, and a button on the clutch pedal which is only activated when the shifter button first powers it. The pedal is connected to the launch rpm but it is only active when the hand button triggers the whole process (remember launch rpm takes precedence over burnout rpm in a 7al-3 so in actuality both will be active on launch but the box only recognizes launch at that moment) Once released it does not come back on during shifts because the hand button has to first power it. Also, you do not have to release both buttons on the launch, I stage the car and let go of the shifter button because the clutch button has now taken over until I dump the clutch, then nothing is active for the rest of the run unless you accidentally hit shifter button going downtrack. Hope this helps and is not too confusing!
Quote:
Originally Posted by Aubrey N Bruneau
I just went through a number of old threads on 2-steps.
I think my head is going to explode !
Brake pressure switch ??????? WTF is that for ?????
Anyhow...
I need to get my 2-step wired into my car ( along with the line-lock that I still haven't installed ).
I need it to hold about 6000 RPM while in first gear, clutch pedal depressed...
But once I leave... allow me to shift around 7000.
How the heck do I do that ? !
I'm expecting a big education here !
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