tuning a maf piggyback - power perfect
#1
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I've been working on the car in my avatar for ~3month now. and I think I'm down to just getting the tune, and I'd like some advice that I could not find by searching.
as an fyi, I've read tons of threads with great information about diy tuning, I've read all the tech pages at lr..etc
I'm tuning a 2.5l turbo with:
k27/8 turbo
LR maf (stage? dont know)
3" straight pipes (although I need to put a muffler on)
I dont know which injectors I have, they are black, not green (I will find out).
The tools I have to tune with are:
- a working wideband 02
- an adjustable fuel pressure regulator
- a power perfect maf tuner that have successfully connected to with my laptop.
I believe there are no after market chips in the dme.
so what I am trying to do is to program the output of the maf to match the transfer function the dme expects using the piggyback.
first, is there any way to test/record what the transfer function of the maf is? just to prove it was in good working order I wired up my volt meter to the output of the maf and blew into it. I could get it to only read 1-2v. would that be normal? I guess I dont know how much air actually flows over this at full boost.
here is what I was going to do:
- current fpr is set at 40
- when warm, idle is rich
- rev to 2k is lean >14.7
- rev to 3k is lean low 14.
at idle, I cannot give less gas via the tuner, only the fpr right? so I was going to back that down a bit to get my idle where I want it.
then start using the ***** to increase the amount of gas at each rpm hitting my desired af value. after a few iterations of this, I should have a pretty decent map.
my concern really is that the input voltage will only go so high, that it limits me to a small range of used cells in the mapping, and only 1 or 2 pots to use.
thanks as always
as an fyi, I've read tons of threads with great information about diy tuning, I've read all the tech pages at lr..etc
I'm tuning a 2.5l turbo with:
k27/8 turbo
LR maf (stage? dont know)
3" straight pipes (although I need to put a muffler on)
I dont know which injectors I have, they are black, not green (I will find out).
The tools I have to tune with are:
- a working wideband 02
- an adjustable fuel pressure regulator
- a power perfect maf tuner that have successfully connected to with my laptop.
I believe there are no after market chips in the dme.
so what I am trying to do is to program the output of the maf to match the transfer function the dme expects using the piggyback.
first, is there any way to test/record what the transfer function of the maf is? just to prove it was in good working order I wired up my volt meter to the output of the maf and blew into it. I could get it to only read 1-2v. would that be normal? I guess I dont know how much air actually flows over this at full boost.
here is what I was going to do:
- current fpr is set at 40
- when warm, idle is rich
- rev to 2k is lean >14.7
- rev to 3k is lean low 14.
at idle, I cannot give less gas via the tuner, only the fpr right? so I was going to back that down a bit to get my idle where I want it.
then start using the ***** to increase the amount of gas at each rpm hitting my desired af value. after a few iterations of this, I should have a pretty decent map.
my concern really is that the input voltage will only go so high, that it limits me to a small range of used cells in the mapping, and only 1 or 2 pots to use.
thanks as always
#2
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I've been working on the car in my avatar for ~3month now. and I think I'm down to just getting the tune, and I'd like some advice that I could not find by searching.
as an fyi, I've read tons of threads with great information about diy tuning, I've read all the tech pages at lr..etc
I'm tuning a 2.5l turbo with:
k27/8 turbo
LR maf (stage? dont know)
3" straight pipes (although I need to put a muffler on)
I dont know which injectors I have, they are black, not green (I will find out).
The tools I have to tune with are:
- a working wideband 02
- an adjustable fuel pressure regulator
- a power perfect maf tuner that have successfully connected to with my laptop.
I believe there are no after market chips in the dme.
so what I am trying to do is to program the output of the maf to match the transfer function the dme expects using the piggyback.
first, is there any way to test/record what the transfer function of the maf is? just to prove it was in good working order I wired up my volt meter to the output of the maf and blew into it. I could get it to only read 1-2v. would that be normal? I guess I dont know how much air actually flows over this at full boost.
here is what I was going to do:
- current fpr is set at 40
- when warm, idle is rich
- rev to 2k is lean >14.7
- rev to 3k is lean low 14.
at idle, I cannot give less gas via the tuner, only the fpr right? so I was going to back that down a bit to get my idle where I want it.
then start using the ***** to increase the amount of gas at each rpm hitting my desired af value. after a few iterations of this, I should have a pretty decent map.
my concern really is that the input voltage will only go so high, that it limits me to a small range of used cells in the mapping, and only 1 or 2 pots to use.
thanks as always
as an fyi, I've read tons of threads with great information about diy tuning, I've read all the tech pages at lr..etc
I'm tuning a 2.5l turbo with:
k27/8 turbo
LR maf (stage? dont know)
3" straight pipes (although I need to put a muffler on)
I dont know which injectors I have, they are black, not green (I will find out).
The tools I have to tune with are:
- a working wideband 02
- an adjustable fuel pressure regulator
- a power perfect maf tuner that have successfully connected to with my laptop.
I believe there are no after market chips in the dme.
so what I am trying to do is to program the output of the maf to match the transfer function the dme expects using the piggyback.
first, is there any way to test/record what the transfer function of the maf is? just to prove it was in good working order I wired up my volt meter to the output of the maf and blew into it. I could get it to only read 1-2v. would that be normal? I guess I dont know how much air actually flows over this at full boost.
here is what I was going to do:
- current fpr is set at 40
- when warm, idle is rich
- rev to 2k is lean >14.7
- rev to 3k is lean low 14.
at idle, I cannot give less gas via the tuner, only the fpr right? so I was going to back that down a bit to get my idle where I want it.
then start using the ***** to increase the amount of gas at each rpm hitting my desired af value. after a few iterations of this, I should have a pretty decent map.
my concern really is that the input voltage will only go so high, that it limits me to a small range of used cells in the mapping, and only 1 or 2 pots to use.
thanks as always
#3
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I've been working on the car in my avatar for ~3month now. and I think I'm down to just getting the tune, and I'd like some advice that I could not find by searching.
as an fyi, I've read tons of threads with great information about diy tuning, I've read all the tech pages at lr..etc
I'm tuning a 2.5l turbo with:
k27/8 turbo
LR maf (stage? dont know)
3" straight pipes (although I need to put a muffler on)
I dont know which injectors I have, they are black, not green (I will find out).
The tools I have to tune with are:
- a working wideband 02
- an adjustable fuel pressure regulator
- a power perfect maf tuner that have successfully connected to with my laptop.
I believe there are no after market chips in the dme.
so what I am trying to do is to program the output of the maf to match the transfer function the dme expects using the piggyback.
first, is there any way to test/record what the transfer function of the maf is? just to prove it was in good working order I wired up my volt meter to the output of the maf and blew into it. I could get it to only read 1-2v. would that be normal? I guess I dont know how much air actually flows over this at full boost.
here is what I was going to do:
- current fpr is set at 40
- when warm, idle is rich
- rev to 2k is lean >14.7
- rev to 3k is lean low 14.
at idle, I cannot give less gas via the tuner, only the fpr right? so I was going to back that down a bit to get my idle where I want it.
then start using the ***** to increase the amount of gas at each rpm hitting my desired af value. after a few iterations of this, I should have a pretty decent map.
my concern really is that the input voltage will only go so high, that it limits me to a small range of used cells in the mapping, and only 1 or 2 pots to use.
thanks as always
as an fyi, I've read tons of threads with great information about diy tuning, I've read all the tech pages at lr..etc
I'm tuning a 2.5l turbo with:
k27/8 turbo
LR maf (stage? dont know)
3" straight pipes (although I need to put a muffler on)
I dont know which injectors I have, they are black, not green (I will find out).
The tools I have to tune with are:
- a working wideband 02
- an adjustable fuel pressure regulator
- a power perfect maf tuner that have successfully connected to with my laptop.
I believe there are no after market chips in the dme.
so what I am trying to do is to program the output of the maf to match the transfer function the dme expects using the piggyback.
first, is there any way to test/record what the transfer function of the maf is? just to prove it was in good working order I wired up my volt meter to the output of the maf and blew into it. I could get it to only read 1-2v. would that be normal? I guess I dont know how much air actually flows over this at full boost.
here is what I was going to do:
- current fpr is set at 40
- when warm, idle is rich
- rev to 2k is lean >14.7
- rev to 3k is lean low 14.
at idle, I cannot give less gas via the tuner, only the fpr right? so I was going to back that down a bit to get my idle where I want it.
then start using the ***** to increase the amount of gas at each rpm hitting my desired af value. after a few iterations of this, I should have a pretty decent map.
my concern really is that the input voltage will only go so high, that it limits me to a small range of used cells in the mapping, and only 1 or 2 pots to use.
thanks as always
How does that 27#8 drive?? is it laggy??
Good Luck with the tuning
![thumbup](https://rennlist.com/forums/graemlins/thumbup.gif)
#4
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I havent really driven it yet, for fear of detonation without a proper tune. I'd say its pretty laggy, the boost (the one time I tried it) kicks on at ~4k. Seems a little high even for that turbo. WHen it kicks, it kicks like a mule tho!
what maf do you have? and out of curiosity, how many lights are lit up when you first feel the boost kick?
what maf do you have? and out of curiosity, how many lights are lit up when you first feel the boost kick?
#5
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I havent really driven it yet, for fear of detonation without a proper tune. I'd say its pretty laggy, the boost (the one time I tried it) kicks on at ~4k. Seems a little high even for that turbo. WHen it kicks, it kicks like a mule tho!
what maf do you have? and out of curiosity, how many lights are lit up when you first feel the boost kick?
what maf do you have? and out of curiosity, how many lights are lit up when you first feel the boost kick?
Trending Topics
#8
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Do yourself a favor and get rid of the power perfect and going with something different. I had this setup for a few years and could never get it to hold a tune. Lart is correct with the way you tune it, very slow and very tiresome.
#10
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Or you could enter the new century...www.roguetuning.com
#11
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
really, just bite the bullet and go for the M-tune. Install it and forget it. You will live in the world of perfect a/f ratios and not have to worry about setup of old world tech.
#12