thirdgen60

iTrader: (10)

You need to put the diode in your transbrake wire, directed so the ground can only go into the transmission but not feed back into the 2-step

slow67

iTrader: (2)

Ground -> Button -> 2 step activation -> Diode -> Transbrake.

Put the banded end of the Diode should be toward the transbrake...(you should be able to verify this with a multimeter).

Get a 1 or 2 amp diode from radio shack.

This also assumes ground activation of the 2 step.

Fbodyjunkie06

iTrader: (10)

So on the banded end of the diode have the t brake wire running into the banded end, and on the other end of the diode have the 2 step act. wire running from that other end to the button itself, then on the other side of the button run that to ground.

Sound right?

slow67

iTrader: (2)

Yep. Basically a diode is an electrical check valve, electricity can flow 1 direction, but not the other.

slow67

iTrader: (2)

Just curious, who's 2 step?

Fbodyjunkie06

iTrader: (10)

MSD, it can use either 12v activation or ground activation.

So how I said in post 23 is how it should be right?

Fbodyjunkie06

iTrader: (10)

If I wire it like I said in post 23 and this diode works like I think it does, it will only allow the ground signal that is coming from the transbrake to travel through the diode activating the 2 step when the button is pressed, correct?

slow67

iTrader: (2)

Yep. Also you should still be ok with MSD's safety activation crap....still do like you did before with the shifter in 2nd, just press the button at idle.

Fbodyjunkie06

iTrader: (10)

Yea if I don't press the seperate two step button at the same time I start my stage it wont cut on because of that stupid 1/3rd rpm drop window it has to see or whatever. I should of got the LPE unit, but I had heard glitch problems with the LNC-002 so I was gonna wait for the new one with timing retard by boost psi but I decided to just go with the msd. I think my staging will be a lot more consistent and now I'll always be able to launch a hundred or two rpm before my converter stalls to give it that hit and help it flash through the stall instead of lugging on it the first 60-100' out the gate then coming alive.

Fbodyjunkie06

iTrader: (10)

You know what I just might set my 2 step at 3000rpm since thats what it stalls to on the footbrake when I'm in 3rd staging at 7psi so that it starts popping and cutting spark on the footbrake giving the turbo a lot more time to spool and then once I light the 2nd light downshift like I have been doing into 1st to set the t brake. I bet I'd still build 10psi of boost just at 3000rpm instead of 3600 or 3800 like I've been launching at. I bet that would give it one helluva hit to help flash through the converter.

FasTimeSS

iTrader: (47)

u want to hook ur trans brake and 2 step together.

Dont worry about the diode dilema. just run the 12v act wire (white with blue stripes) on msd and hook it to ur + trans brake and then to a push buttom. Perf on the shifter ****. done. Ive been running this for well over a year with no issues.

slow67

iTrader: (2)

Jake's transbrake uses a shift solenoid to activate it, so without a diode, the 2 step engages in 3rd and 4th.

FasTimeSS

iTrader: (47)

how would it engage in 3rd and 4th if its on a push button?

overhere

iTrader: (2)

thats how mine is wired, works great

slow67

iTrader: (2)

Because it uses the 3/4 solenoid in the transmission. When the trans is in 3rd or 4th gear, the 3/4 solenoid is active. It feeds back to the 2 step (unless a diode is in the way)

Fbodyjunkie06

iTrader: (10)

This.

Jake's t brake uses a - not positive for activation.

Slow, you think that the hot 12v that feeds our tranny's for jakes box is giving the t brake power and that the only thing that completes it is the yellow ground? If that is the case shouldn't I be able to just hook the yellow t brake wire directly to the ground on the button and the msd 12v act. to the + side on the button?

slow67

iTrader: (2)

No, because the hot wire also feeds the other shift solenoid and the TCC.

Fbodyjunkie06

iTrader: (10)

that's what I figured that it powered those also, but wouldn't that still work? And that way the t brake ground can't feed back into the 2 step since the button's circuit will not be complete, or do you think I will fry something this way?

slow67

iTrader: (2)

No, when you shift its grounded through the transmission case. The Tbrake circuit is Tee'd into it this circuit.

Fbodyjunkie06

iTrader: (10)

so even if I ran the t brake wire to a ground point on my shifter and from there to the ground side of the button that still wouldn't work?