I installed the mp-8 today. Am I correct in assuming that the **** all of the way to the left is the lowest setting and the more you turn it to the right (clockwise) the more RP your surposed to see? Here is my observation. I keep it all the way to the left (counter clockwise) I see a max of 23.5k of RP (same as with out the mp-8). I turn it to the right (clockwise) I see a drop, the further I go the more it drops. All the way to the right and max is 14k of RP? WHAT IS GOING ON? Is the mp-8 working correctly and my cp-3 can't keep up or is the mp-8 not working properly? I need help!

 

Hmmm... is it new or used?

 

You have the gauge plugged into the sensor first or the MP-8. Sounds like you have the MP-8 plugged into the sensor and then the gauge plugged into the MP-8 and then the factor harness into the gauge. If so, swap the MP-8 and gauges harnesses.

The MP-8 works by telling the computer that there isn't enough rail pressure and that the cp-3 should work harder.

 

So my quad RP gauge plugs into the sensor as well. I just followed the instructions and unplugged the map sensor and plugged the mp8 into that (trucks factory sensor) then plugged what was in the sensor into the mp8. Then I located the fuel sensor on the rail and plugged the mp-8 into that. Something so simple is confusing me...and its frustrating me. o the quad RP gauge plugs into the map sensor too? If so which on plugs into the stock sensor next to the valve cover first, the mp8 ot quad gauge? Or am I way off on this.....

 

No, the quad gauge just goes to the rail only. So what you want to do is unplug all your rail connections, and then plug in the following way. 1. Plug the quad gauge into the fuel rail sensor. 2. Plug the MP-8 into the quad gauge. 3. plug the factory fuel rail harness into the MP-8. You are ready to go then.

What you are currently reading is the MP-8 and not the rail. When you cranked it all the way up and only saw 14K, it was probably 27K. The 14K output of the MP-8 is making the computer add more pressure through the CP3. It is a really simple principle. The computer wants to see a certain pressure (and you want more); so with the MP-8, you tell the computer that the pressure is lower than it needs to be (but it isn't) and the computer makes the CP3 put out more pressure.

Sample principle of boost fooling. You're telling the computer that you haven't reached the boost level that the wastegate should open, so it doesn't open.

 

Ok I get it, I think...LOL I know for sure I have the mp-8 plugged into the the rail sensor and what ever was plugged in to the rail sensor got plugged into the mp8. I take it I plugged the RP gauge into the mp8. So let me get the flash light out and go check. I didn't even think about the RP gauge. So quad,mp8,factory.... got it.

 

AND THEN.........Wow the suspense is killing me.....

 

Ok, got it fixed. Went sensor, RPG, mp8 and factory. Went for a quick ride and RP is up. 26k when I turned the dial up for the little distance I had. I need a long road and some WOT time to see the max RP, to make sure my cp3 maintains it and then find that happy spot. Thanks for the help. Nice to see that we can get some quality help. What would we do without these forums..... LOL Thank you

 

Dang beat me to it!!! The mp8 is tricking your truck into bumping up the rp by causing the computer to read low signals. Looks like its fooling you too..lol. Plug the gauge in before the mp8 to get the correct readings. I can read rp off my DS predator and when I use the MP8 it gives false readings.

 

MP8 is working...... from the little road time i am seeing a 2.5k increase at the rail. Up to 26.k for RP from 23.5k earlier today before install. Yeap, I guess you can say I was fooled too.... LOL

 

Most programming keeps the upper limit on the pressure (23.5K). Most of the time it just changes how it gets to that point. Some tunes will increase the upper limit (commanded pressure). For those that want to "dial-in" the pressure to a certain point, a pressure box is nice.

 

Good to hear man. 700+++ is looking promising!

 

So with a MP8 you set your smarty to RP#0, and adjust from there??

 

10-4.... thats what I do. Pressure on demand instead of running it all the time. Just crank up the volume **** when you want more power.

 

I like it. sw7 with the mp8 turned up feels alot like sw9. I did turn my rp down to 1 on the smarty today. 700hp.....I may be close.