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View Full Version : Got the 2-step limiter working today


DoghouseDiesel
June 26th, 2011, 11:08 AM
For the longest time, I've wanted a 2-step for launching the truck without having a trans brake.

Got it figured out with the RPM limiters.

We have it launching at 2100 RPM's and 25 psi each launch.

:sly:
FUBAR
June 26th, 2011, 02:47 PM
Good job! Wish there was merit in me asking how you did it...but sadly I am not ready for that yet...none the less, good work.
06redram
June 26th, 2011, 04:15 PM
Please give us some info on how to set it up. Share how to or just post gragh
DoghouseDiesel
June 26th, 2011, 10:29 PM
It's real easy.

Once you open the tune file, go to the Engine Protection tab, open up the limiters and it's the first limiter (RPM in neutral).

This also limits the RPM's while the truck is stationary and you're on the brake.

All you need to do is figure out what RPM's make the boost you want to launch at and set that limiter to that RPM.

In my case, 2100 RPM's made 25 psi, which is what I normally launch at with the drag radials on it.
Straight 6
June 27th, 2011, 07:58 AM
awesome find... thanks for sharing :rockon:
MQ105
June 27th, 2011, 10:34 AM
Rich,

You're saying the limiter for RPM in neutral also limits RPM in gear at 0 mph?
DoghouseDiesel
June 27th, 2011, 11:09 AM
As long as you're on the brake and stationary, yes.

When you click on the box for that parameter, look up at the description. It states while in neutral or stationary.

I was wondering if it would work, so while I was at the track yesterday I pulled out to the back, put in gear and wound it up until I hit 25 psi.

I set that limiter to 2100, went down to the lanes, pulled up, stood on the brake and wound it up.

Stopped at 2100 and was holding boost. Sounded just like a gas motor coming up on the 2-step.
monkeybrain
June 28th, 2011, 01:38 PM
Cool! I'll definitely be trying this. Thanks for sharing Rich.
KB3MMX
July 17th, 2011, 04:54 AM
Nice !!

Thanks for the tip!
DoghouseDiesel
July 17th, 2011, 05:56 AM
Okay, skip this for now.....

It works well limiting it on the line but it appears it's also limiting the top end.

If you're running stock RPM's then you probably wont notice it, but if you have the RPM's turned up, it's defueling.
mattyboy72
August 2nd, 2011, 02:57 PM
so did u ever figure out how to raise the top end rpm to stop defueling?
DoghouseDiesel
August 2nd, 2011, 04:45 PM
so did u ever figure out how to raise the top end rpm to stop defueling?

http://forum.efilive.com/showthread.php?16935-Strapping-the-truck-(and-the-Chevelle)-back-down-tomorrow.&p=151531&viewfull=1#post151531