MPI tuning

[mazdaspeed75]

n

yea i know that but my psi i want it to be rich at my max tq point . I need to tune it out some it not hurting me It dosent really buck the car it backfires but it pulls hard I tried to make a vid tonight but had probs with my camera.

 

[JDM Sam]

Tony speaks in cajun online.

 

[wicked]

so...................fuel cut with the MPI?

is this normal?I sure hope not.

 

[terbow]

Tony speaks in cajun online.

lol

 

[Bigg Tim]

so...................fuel cut with the MPI?

is this normal?I sure hope not.

Absolutly not, there should not be any backfiring or bucking when it's tuned right. You can adjust the analog limit to make it so there will be NO fuel cut. If someone is experiencing fuel cut, then they need to lower the fuel upper limit. They should have xtra injectors if they are at that high of boost to need to lower the fuel upper limit. I have not seen backfiring when the TM kicks on with no load based trim, so I don't know about that one. I have driven in cars tuning them that bucked hard when the TM came on, but no backfire.

 

[Titanium-99]

I back fire like a mofo, my car runs extremely rich, I was having super hard bucking at 3-4k rps but Sam tuned that out a little but now the map is super lean and he instructed me not go into boost until he gets a chance to get his hands on my car to have a crack at tuning it. What is weird is that even though my car is running lean right now it still feels like it is super rich. I am just happy that I have a Richard and a Sam to help me get this problem figured out though I am certainly up for any of your wisdom Timm. Im not so sure that the new turbo modual is a good thing for my car and I am thinking I need the old style turbo modual. I really hope to get this running right on my car because its getting close to a point where I may need to take this thing of my car and sell for something else which would really make me unhappy because I know the MPI is a good unit and I want it to work. I have replaced my o2 and cleaned my MAF what else could be causing the car to run rich? its like there is no in between with the fule on my car its like not matter what its always running rich.

 

[Bigg Tim]

I have to get my hands on a MSP. I have never seen any backfiring when it comes on, it must be a MSP thing because you already have a bunch of fuel. I will try to get with a local MSPer this weekend to do some MSP tuning so maybe I can help better then I am with the MSP people. The TM differences shouldn't make a difference because you are still getting extra fuel, just in a different way with the new ones.

 

[azeli73]

Who here in the valley is running a MPI on their MSP Tim? I'm seriously thinking of switching and would like to see the difference.

 

[mazdaspeed75]

I have to get my hands on a MSP. I have never seen any backfiring when it comes on, it must be a MSP thing because you already have a bunch of fuel. I will try to get with a local MSPer this weekend to do some MSP tuning so maybe I can help better then I am with the MSP people. The TM differences shouldn't make a difference because you are still getting extra fuel, just in a different way with the new ones.

Iam trying to get vid of it . Its not fule cut i have it 4.70 Yea its probaly alittle rich at that point it doesnt buck just slight hesitation nothing that is going to make me lose a race . I have a feeling its when i put fuel cal from 5 to 6 made the whole map a little richer .

 

[Bigg Tim]

Iam trying to get vid of it . Its not fule cut i have it 4.70 Yea its probaly alittle rich at that point it doesnt buck just slight hesitation nothing that is going to make me lose a race . I have a feeling its when i put fuel cal from 5 to 6 made the whole map a little richer .

That's probably it then, too much fuel.....DAMN MSP's(thumb)

eli--AZMSP84 has it on his. He is in Scottsdale and I may try to meet up with him this weekend if I get time. May also try to help emilio too, his is a b**** isn't it?

 

[Jeph]

Latest datalog, i had a weird buck in first. But a second earlier it pulled sooooo hard against a V6 mazda6 i had my window down to talk to him at the second light and he punched it. So i caught him in first, passed him in second and shifted around 5500 while hearing him hit his rev limiter... haha
/members/Jeph/Dec28.raw
Tell me what you think Tim

 

[Bigg Tim]

Latest datalog, i had a weird buck in first. But a second earlier it pulled sooooo hard against a V6 mazda6 i had my window down to talk to him at the second light and he punched it. So i caught him in first, passed him in second and shifted around 5500 while hearing him hit his rev limiter... haha
/members/Jeph/Dec28.raw
Tell me what you think Tim

A little rich but not bad. You look like you are too rich in the 2nd and 3rd columns. The AFR cycles too much, it should only go from like 14-15, you go in the 13's. I would make those 1's, 0's so you don't throw a code later for being too rich in closed loop. So what's the AFR in WOT? The SW shows pegged rich, lean it out until you are around 11.8 or so, then it should be safe. That is if you only have 91 octane gas. If you have 93, take it to the 12.0 range.

 

[mazdaspeed75]

y

Yea ive seen some 12.5 but like he said 12.0 safe .

 

[FlyinMSP]

9 psi is safe, anything above that could lead to trouble, eventually...

 

[Jeph]

I could run 14 psi if i wanted as long as i can keep the right A/F ratios. On that particular run i was a little rich, but i was between 11.2 and 11.8 for most of it. Its still really rich right when the TM kicks in

 

[mazdaspeed75]

n

Not everyday and a/f in check and timming pulled .

 

[Bigg Tim]

I could run 14 psi if i wanted as long as i can keep the right A/F ratios. On that particular run i was a little rich, but i was between 11.2 and 11.8 for most of it. Its still really rich right when the TM kicks in

To tune out the switch, you need to trim fuel via the 8x16 also. I like to have all positive numbers, this is only my preference and is not required, so I raise the fuel cal and raise all the numbers in the map to compensate. On yours, you could put -5's or so wher eit comes on in the 8x16 to help trim it.

Here's a shot of how I did it on an MSP. You can see the zero's in the 8x16 and the low numbers in the 1x16 where it comes on. You can see how high I had to raise the fuel cal to get the zero's to work like I wanted. So in this case on this MSP, I needed -9 less then the rest of the map in the switch area. You may not need that much because your's isn't an MSP.

Also, since you have xtra injectors, you could do away with the purple TM wires and not run the coolant clamp. That would make it so you do not have to tune around the switch coming on, but you will have to add more fuel via the xtra injectors to compensate.

 

[Jeph]

So i noticed something last night driving around & tuning. I lowered every value in the first 3 columns, and towards the end of the night i was running soooo rich going into boost. It was like the ecu was pulling fuel through the whole map when i had numbers in those first 3 columns, so since i took those out, i had to lean out the whole map a ton.

 

[Jeph]

So my car has been acting really fuct up ever since i took out those numbers in the first 3 columns. I'll drive along fine for a while, then randomly i'll be sitting at a light, and it will go way way lean and almost die. Then from then on it'll stay really lean unless i go full throttle and force my TM to come on. Even freeway driving it won't read anything on my wideband because its lean...
And when it isn't doing that when i put it into neutral it will go pig rich for a second before it leans itself back out to about 14.5
Should I lower my fuel calibration so it doesn't go rich like that? I loaded my old map and it seems to be working ok for now. At least until i someone can help me figure out whats going on

 

[Bigg Tim]

So my car has been acting really fuct up ever since i took out those numbers in the first 3 columns. I'll drive along fine for a while, then randomly i'll be sitting at a light, and it will go way way lean and almost die. Then from then on it'll stay really lean unless i go full throttle and force my TM to come on. Even freeway driving it won't read anything on my wideband because its lean...
And when it isn't doing that when i put it into neutral it will go pig rich for a second before it leans itself back out to about 14.5
Should I lower my fuel calibration so it doesn't go rich like that? I loaded my old map and it seems to be working ok for now. At least until i someone can help me figure out whats going on

So is it lean or rich, you said both? If you lowered your numbers, then you leaned it out and it will run lean because of that. I would add the numbers back in to get the fuel you need. The part when you come to a light and it goes rich before it leans itself out is normal.