DOn't cars like Sunfires/Cavaliers have that stock? If you try to rev with the AUTO in neutral it will stop at 4k and with clutch in in manuals at around that RPM? Same thing I think.

 

sounds like you need a trans brake and a line lock

 

I tried it but when I open her up on the street it engages in every gear.

 

Do you mean the limiter engages in every gear?

 

I was thinking about doing this on my a4 gto. Maybe a few of us slushbox guys can put our heads together here. We should have a switch with wiring that tells the computer when the car is in park or neutral. Here is how I see this happening. Tap into the wire that tells the pcm we are in neutral/park. Use 2 switches, like a nitrous setup. One to activate the 2 step, and one to release it. You put a wot switch from a nitrous kit under the brake pedal. So, you do your burnout, and pull up to the line. Flip the "arm" switch, and stand on the brake. This contacts the "wot" switch, and makes the car think it is in park/neutral. Once you release the brake, the car thinks it is in gear again, and your limiter is released. This would be a good thing, as you eliminate the time to floor the go pedal. However, after sharing this with a friend, he said the computer may not be happy with this, as it will think you are doing a "neutral drop". Just my .02

 

Any updates on this Zombie?

 

So let me get this straight.....

If the clutch is IN and the car is NOT moving (0 mph reading on the speedo), the car will bounce on the 2-step.

If the car is moving and the clutch is in, it will rev freely to any desired rpm until you hit the rev limiter.

I wanted to clarify this since I was leary of rev matching to a lower gear and hitting the 2-step instead.

 

In both situations it will be on the 2 step limiter. Only time the 2 step limiter is not engaged is when you are moving with the clutch out.

 

so if your in 3rd and you push the clutch to go to 4th and just hold it in, the rpms will drop even under throttle?

 

So you're basically fucked if you want to downshift from 4th gear at 50mph to 2nd gear.

 

depends on where you have your limiter set, but even if your bouncing off it, just let the clutch out slow. I'm the only person i've ever known who rev matches anyways. Everyone else just puts it in gear and lets the clutch out.

Besides, you don't have to keep the 2 step feature in, you can program it out for daily driving and just put it in for the track.

 

Too bad there is not a mph selector there. 0 mph limiter on, 1 mph limiter off. Ver. 2.0??

 

yeah that would be awesome if it wouldnt kick in while moving... I don't think I'm going to do it just because of that.

 

Zombie, have you ever had the opportunity to see if there was an improvement on launch (consistency or otherwise) at the track?

 

so is this all theory or what?


because ive gone thru this twice before now.. on a manual, the car ALWAYS thinks its in 4th gear... it never goes to "neutral".., so it never comes on.

 

Nope, I can't race my car at the track due to the clutch always welding itself to the fly wheel. Happened for the 5th time last week. Spec is junk.

I'll have something better than a 2 step in a month or so.... trans brake and n2o

 

what about putting in the clutch while switching gears? Wouldnt it cut fuel in between gears?

 

I imagine it would if it were enough to release the neutral safety switch (which I am hypothesizing what is actually being monitored) and your set point is lower than the transition rpm. I don't know how long the throw of that switch is, but I find that I can change gears by just applying some pressure to the clucth (stock clutch) without actually depressing it all the way. Does anyone know what the throw of the switch is?

If you're speed shifting, though, it's not too much different (once again, I'm guessing) than running up against the limiter at the higher limit. It's just the set point is lower.

 

having it come on at the wrong time isnt a issue.

you could always change the switch to be something that only happens on launch


the key here is to have a input (wire to the PCM) that will enable this "two step" feature when on.

once you have that you're set... the rest can be done several ways.