Hey alls...
Completely new to HP Tuners... have done some work with SCT 10+ years ago so that info is long gone.
I'm trying to get my ducks in a row to get a base tune on my '98 Grand Cherokee. Its a 4.0/auto that is now turbocharged. I'm currently babying it around and staying out of boost until I can get something going on it.
A friend of mine is loaning me his MPVI2 for a few weeks to see what I can do. I don't have it in my possession yet.. it'll be a week or so.
Another friend is hooking me up with a 2 bar MAP sensor and 36lb injectors.
My first goal is to get it running with the 2 bar MAP and get it to take boost without freaking out and dumping fuel.
From doing some reading, It looks like I need to change the "MAP Scale Multi" from 244 to 122 to take full advantage of the 2 bar sensor. I don't plan on running anywhere near 14psi.. likely only 6-8psi.. so I may not need to take it down that far.
Now I've located the main fuel and spark maps.. and have read that I need to re-scale them for the new multiplier. Anyone want to give me a basic run down on how I would accomplish that?
I've also read that I'll need to "1" out the "Altitude Correction" table. That's simple enough.
2nd goal will be to get the bigger injectors swapped in as I doubt the stockers will be up to the task. Without any information other than the injectors I'm getting are from a stock supercharged 3800 (late 90s GTP).. how would I go about doing that?
Once I get the tables scaled, I think I can manage dialing it in as everything looks pretty basic from what I'm seeing. I downloaded the software and pulled up a member posted tune just to get a feel for where things are.
So... who feels like teaching the new guy?
I appreciate any help/pointers/direction you guys can offer. I'm hoping to dive in head first come middle of next week.
Thanks!
-Chris