MPI Tuner Library

[acidbug]

I am runnin 11.8's a/f through boost..that is at partial, and wot. Anyone thinkin of tuning w/ the mpi & fmu (begi/vortech) is not going to be able to get their a/f down as well as i would. b/c you are adding another variable into the equation.

Chas

 

[LinuxRacr]

so with the mpi tuner you will run lean?

If not tunned properly, or soldered properly.

 

[MPNick]

If not tunned properly, or soldered properly.

Your mileage may very.


Thanks again

Later.........Nick

 

[igdrasil]

yeah...im now leaning out all the light throttle, non boosted part.

 

[Matthew]

how are you going to fix it?

 

[igdrasil]

how are you going to fix it?

what you mean?

 

[Matthew]

nevermind it sounded like the lean was a problem, i see what youre saying now.

 

[Little Beavis]

You could also just go to an adjustable regulator and bring it up a few psi and then use the MPI to lean out idle. That would allow you do go higher than 8 psi on the stock injectors and prevent the lean stuff. Heck, igdrasil, didn't you already have a different FPR?

 

[igdrasil]

What Im doing right now is adjusting the FUEL ZERO CALIBRATION to lean out the whole map and then adjust idle.

Im currently running with the FM O2 modifier, and had to lower all numers down to "2" in the whole map because the 12:1 FMU pushes enough fuel thru the injectors everywhere in the map.

If you try to use higher numbers you will have problems when boosting.

 

[acidbug]

What Im doing right now is adjusting the FUEL ZERO CALIBRATION to lean out the whole map and then adjust idle.

Im currently running with the FM O2 modifier, and had to lower all numers down to "2" in the whole map because the 12:1 FMU pushes enough fuel thru the injectors everywhere in the map.

If you try to use higher numbers you will have problems when boosting.

Hey...

The reason for such small numbers is b/c you have Both a Vortech FMU & Inline Fuel Pump. The combination you have is just way to much fuel!

My suggestion is just pull the Vortech FMU..and keep the inline!

At 6 psi w/ the mpi tuner & msd inline fuel pump..i ran so rich..my ANALOG FUEL CALIBRATION was in the NEGATIVES!

Keep us updated!

Chas

 

[igdrasil]

Hey...

The reason for such small numbers is b/c you have Both a Vortech FMU & Inline Fuel Pump. The combination you have is just way to much fuel!

My suggestion is just pull the Vortech FMU..and keep the inline!

At 6 psi w/ the mpi tuner & msd inline fuel pump..i ran so rich..my ANALOG FUEL CALIBRATION was in the NEGATIVES!

Keep us updated!

Chas

The thing is...I dont want to run 6psi, Im currently boosting 10-12psi.
I cant run without the FMU becuse, it doesnt matter if I put a 40 all across the board on the fuel map, it would run rich on vacuum and lean when boosting over ~3 psi. Looks like my O2 clamp on the Turbo module wasnt working at all.
So I went safe and used the Fm O2 modifier and now its working but not tested the MPI alone without the FMU.

But...this is just a workaround, in the meantime while i run without the extra injectors.

JAJAJAJAJ and tell me about running that rich. I have experienced heavy detonations (not the bad detonation/ping/knock) that were louder than M80's...then I watch a large black cloud in all my mirrors jajajajaj.

 

[igdrasil]

Current 10psi FMU Fuel map - fuel zero calibration: 6

This is what Im testing right now....still running pig rich but not that bad.
Still having some fun.

Notice those "6" in the fuel map. Those where imput there while using cruise control @ ~65mph climbing up hill on vacuum near 0vac.

I was just testing, trying to see if i could richen the mix and lower temps....with success. I could lower ~50C just like open loop or better.

That was a workround because I hate to hear my 650C temperature alarm...(crazy)

 

[LinuxRacr]

Do you have the extra injectors? Can we get a look at your AEngTemp, and AMP scales also?

 

[LinuxRacr]

The thing is...I dont want to run 6psi, Im currently boosting 10-12psi.
I cant run without the FMU becuse, it doesnt matter if I put a 40 all across the board on the fuel map, it would run rich on vacuum and lean when boosting over ~3 psi. Looks like my O2 clamp on the Turbo module wasnt working at all.
So I went safe and used the Fm O2 modifier and now its working but not tested the MPI alone without the FMU.

But...this is just a workaround, in the meantime while i run without the extra injectors.

I'm having the same issue bro. 3PSI is where I go lean no matter what. Even when I use the AEng Temp scale for load control!! I may give the extra injectors a try soon! What do you have your fuel pressure set at with the FMU? I still have mine in spiking to 51 PSI (lowest setting).

 

[igdrasil]

I'm having the same issue bro. 3PSI is where I go lean no matter what. Even when I use the AEng Temp scale for load control!! I may give the extra injectors a try soon! What do you have your fuel pressure set at with the FMU? I still have mine in spiking to 51 PSI (lowest setting).

I have never ever tried the AEng Temp to add fuel. Those are all set to 1.00.

If my guess is right. AEngTemp will send a specific voltage to the ECU Coolant temp sensor receiver and make the ecu send a bit more fuel...right?

I may not alter any other values until I get my module working, so thats why im sticking to the FM o2 modifier...

Probably, I dont need the turbo module at all..I would rather keep the stock fuel map working as is and use the turbo module only to fire the coils.

I think this way is the better way to go. The FM O2 modifier will be doing its job to keep the ECU from pulling out fuel while I add fuel thru the extra injectors.

 

[LinuxRacr]

Yeah, I monitored the voltage on the 1st O2 sensor, and I'm not sure it is clamping. BTW, the 1.00's in the AEngTemp scale is the max value. I started out with mine all set to .80 (like 80% of the numerical value in the 8x16 maps), and adjusted for load. I also calibrated my scales. The AEngTemp is at max 100, and the low number is 30. It moved the values closer together for a more smooth transistion. No more lean starts at a stop light! I also did the IgnAMP scale. The max value is not 1.10, and the min value is like .20. What we are trying to do is get it to where at idle, it can bounce between the two squares on each scale easily, and at full boost be at the other end.

 

[Bigg Tim]

Why don't you put all 1's in the AEng column and work on the map, then take down the numbers over there as you need to? Make sure you get the voltage to around 4.98 so you are utilizing all of the fuel that the stockers can give you. I have an 8 at the top few boxes at WOT and I'm at about 4.8 to 4.9 at around 6200 RPM, so I possibley could go higher but I'll stay with that. My fuel cal is 5, but I know you guys are using different things than I am. There is no way I could just use the stockers alone at my 8psi. I also have 55's up there in the injection tab to give me the amount of fuel I need to be at 12 or less.

 

[Matthew]

i dont understand how you cant use the stock injectors at 8psi?

 

[LinuxRacr]

Why don't you put all 1's in the AEng column and work on the map, then take down the numbers over there as you need to? Make sure you get the voltage to around 4.98 so you are utilizing all of the fuel that the stockers can give you. I have an 8 at the top few boxes at WOT and I'm at about 4.8 to 4.9 at around 6200 RPM, so I possibley could go higher but I'll stay with that. My fuel cal is 5, but I know you guys are using different things than I am. There is no way I could just use the stockers alone at my 8psi. I also have 55's up there in the injection tab to give me the amount of fuel I need to be at 12 or less.

Wow! May be time for me to try the extra injectors!! I'll try your "reverse of mine" suggestion, and see how that works out!

Thanks!

 

[jaman]

i dont understand how you cant use the stock injectors at 8psi?

Yeah, that's what I would like to know!