Question about idle speed and gear selection with LS2 4L70

[73z-6sp]

gyhujikol

[meenaggie]

The autometer tach needs to be set to four cylinder to work correctly . . . Double check that setting and it should work fine.

[73z-6sp]

cfvgbh

[Magntik]

Dude,
You're running already? That's fast. Great job.

My set up idles at about 660- 675 when I first start it up. after it's warm I'm sitting at 590 - 610 rpm.
My DBW does a funky little surge & droop thing when it's first fires up but comes right out of it. Like 2 - 3 seconds???
I was just back at the Dyno/ tuner guy yesterday and he said he didn't see anything out of the ordinary.

send you a PM.

[rocketrod]

Awesome! I am going to make a road trip tomorrow and pick an LS2/4L70E package myself.

[73z-6sp]

gbhnjmk

[Z06vet]

I am running mine off the 4th gen LS1 ecm tach wire, autometer gauge, 4cyl setting. Is that tach new? I had an old set of gauges that read 200 rpm high. Didnt realize it until my tuner had the laptop hooked up. How is it wired up now?
Scott

[meenaggie]

You can also try a pull up resistor. Check out this thread for details . . .

https://www.pro-touring.com/showthread.php?61573-GMPP-Drive-by-wire-ECM-to-factory-tach