FDLS6

iTrader: (4)

How does the computer know if you're in neutral or in gear? I've been trying to track down some idle issues and found that one of my IAC decay delay parms was to blame. It was the "in gear" table that was being used but the car was in my garage and in neutral. For the purposes of my HPTuner tables, should one always use the "in gear" tables? Are the Park/Neutral tables ever referenced?
Thanks in advance,
Bryan

BLK02WS6

iTrader: (2)

I believe on a 6 speed, park neutral is used when the clutch is in, and in-gear is used when the clutch is out...

RedHardSupra

iTrader: (1)

no, on 6speed, you're always in gear. P/N is simply unused.

BLK02WS6

iTrader: (2)

Okay, thanks - thought I read that somewhere...

Phil'sC5vette

iTrader: (4)

you have good write ups on your homepage links !

FDLS6

iTrader: (4)

Cool, thanks for the info!

ryarbrough

iTrader: (18)

I wonder if there's any way to use that setting as a two step (ground/power whatever pin needs to be) like the ford guys do?

Chevy406

iTrader: (12)

You can indeed use the P/N column of the RPM limiter table at a 2-step for a 6 speed. The clutch switch (rest position) will indeed trigger the ECM to the P/N at least for the RPM limiter (I just made this change on my car and it works). I can't say for sure if P/N is triggered for all other tables though.

ryarbrough

iTrader: (18)

Which switch controls that? Top or bottom?

I'd like to try and make this work with my car (converted to TH400) while activating the trans brake rather than having the harlan two step cluttering everything up

Chevy406

iTrader: (12)

The top clutch switch triggers the ECM to P/N. I would say a momentary switch setup to ground that wire into the ECM will give you a quick and easy 2-step.

carlrx7

how does this p/n limiter come into play during WOT shifting? does it drop the rpms to 4500 rpms between shifts?

-Carl

mcamarols1

iTrader: (9)

Hmmm I never heard of this. So the top switch is the one you need to splice/cut and put a momentary switch on it for the two step. Someone please explain this is very interesting.

Chevy406

iTrader: (12)

Yes, the P/N rpm limiter will engage at launch and shifts - anytime the top clutch switch is closed (as soon as the clutch pedal starts to move from rest). I have experimented on the street at both 3500 rpm and the current 4500 rpm. It allows you to flat-foot your throttle during shifts without over revving. I'm afraid this 2-step setup won't result in stellar 60 foot launches though. I hope to find out tomorrow evening. The problem is that the limiter will continue to be engaged until the clutch is fully released. I am just not quite sure how it will do on a dragstrip with sticky tires.

LSxPwrDZ

iTrader: (4)

I've messed with that setting before on my car and it's okay as a last resort but sucks because the limiter portion is so slow at popping. I can do some tests at the track as well to see how it works.

It will help get your shifting right though because it cuts engine power between shifts and the shifts almost fall into place. If your quick enough on the shifts it will cut fuel when you push the clutch pedal but as soon as you let back out on the clutch for the next gear the limiter is reset to that gear's limit. So your only at the 4500RPM limit for a tenth of a second or so, just long enough for you to get it in gear and let back out of the clutch.

macca_779

Not all cars utilise the clutch switch as a PCM input. Corvette's probably use the clutch switch due to the PCM controlling the cruise control as it has ETC.

kenracer

iTrader: (3)

Can you use the p/n switch on an auto car the same way? Or does it signal something eletronic in the transmission as far as trans pressures?

RalphPZ06

Guys: I know this is sort of a dead thread and I hope you don't mind if I revive it. I had a Lingenfelter LNC002 launch controller on my car and it worked OK for about a year and then the car started intermittently running on 4. It is too expensive for me to buy another one to last another year so I went to this method using HPTuners. It works for launch but unfortunately when I flat shift 1-2 (which I must do to go fast in my turbo car) it activates the low limit and stays there even after I let the clutch out. It works fine if I don't flat shift...

So I have been trying to disable it during shifts but enable it for launch. What I have learned is that the computer senses P/N on a logical "OR" basis if either the clutch floor switch is depressed, or the clutch top switch is open or if the shifter is in neutral. So I have figured out how to defeat both clutch switches during shifts but I still have the problem flat shifting, presumably due to the transmission neutral sensor. I have probed both sensors on the right and left sides of the tranny but no luck getting a "closed" reading on either one when the shifter is either in gear or neutral so I'm not sure... (it is hard to probe them though...).

Does anybody know which connector on the MN6 is the P/N sensor? Or have any other advice ?

Thanks