Now using the MAP sensor..

[Focus]

Well if I go to stand alone, the MPI won't matter because it will be another system all together.

I thinik he meant, practice tuning with the MPI, because tuning is harder with a standalone because there is so much more control. More things to fiddle with.

 

[mazdaowner123]

Thanks linux!

~brian

 

[LinuxRacr]

I'll snap a couple of photos of my MAP sensor. Everything else is to messy right now...

 

[RyanJayG]

picz?

 

[igdrasil]

Thats nice... I always thought using the stock MAF could be a pain to tune for boost. Too much tunning is needed in order to make it good.

Anyway, in the meantime im back again with the FMU and MPI to do some retard and pull out some fuel where the FMU sends too much. Feels very nice.

So Linux, the only "load" reference you use is the MAP, right? So now you are not "controlling" the stock injectors?

 

[LinuxRacr]

Correct. Not controlling the stock injectors. I will try to get pictures of the MAP sensor. Essentially it is 3 wires to hook up (Power, Ground, Signal), and a boost signal from a vac line.

 

[igdrasil]

yeah...i probably will go that way as soon as I do the custom intake manifold. I might even do only 2 injectors before the TB, you never know when only 1 fails on one run @ 30psi for example!

 

[70]

(second) Glad to see you took my advice from over a year ago. Simple to tune this way, isn't it? Hopefully more people will start listening to me about it now. The easiest way to use the MPI tuner is...

-with an FM clamp
-with extra injectors, controlling only those injectors
-with a MAP sensor to sense boost
-to retard timing where necessar
-with a FCD, if necessary

Happy tuning.

Interesting...

So, you use the MPI to run the extra injectors and use the MAP to tell the MPI when to come on? Leave the stock injectors to be run by the ECU, and change timing with the MPI too.

Why is the FM clamp better than the turbo module?

Now, my other question is what other devices can run extra injectors in a similar manner that aren't as expensive?

 

[70]

Yeah, I checked. The car was still running bad. I know now that it had a lot to do with the MAF sensor being controled by both the MPI and the stock ECU (******* OBDII (pissed) ). The smoothness of stock has returned to my car outside of boost..

Glad things are going better for you now...(cool)

 

[Bigg Tim]

yeah...i probably will go that way as soon as I do the custom intake manifold. I might even do only 2 injectors before the TB, you never know when only 1 fails on one run @ 30psi for example!

Pre throttle body injectors would of helped in your 1 cylinder lean condition you had. That cylinder would of had more fuel delivered in there with the xtra injectors. I'm not saying it would of saved it, but it would of helped. There are some big dog motors running 2 injectors pre throttle body.

 

[Focus]

Pre throttle body injectors would of helped in your 1 cylinder lean condition you had. That cylinder would of had more fuel delivered in there with the xtra injectors. I'm not saying it would of saved it, but it would of helped. There are some big dog motors running 2 injectors pre throttle body.

I had 4 put in, 1 in each runner, just in case.

 

[Bigg Tim]

I had 4 put in, 1 in each runner, just in case.

That's cool, they would of definatly helped out. Pre-TB is a cheaper alternative, plus it helps to cool the charge air a bit while adding fuel.

 

[trbomp5]

so let me get this right, your running a FMU a VC and the map sensor? No standalone? Care to explain the hookup of the map?

 

[70]

I had 4 put in, 1 in each runner, just in case.

Got any pics of this?

I've been wanting to see a car set up like this...

 

[LinuxRacr]

so let me get this right, your running a FMU a VC and the map sensor? No standalone? Care to explain the hookup of the map?

The FMU has been gone out of the car for months. I am running the MPI Tuner with the MAP sensor, and the Voltage clamp. The MAP is hooked up using just 3 wires. Power, Ground, and Signal. The signal goes into the MPI where the MAF used to be hooked. You also hook in a boost signal to the MAP sensor.

 

[Focus]

Got any pics of this?

I've been wanting to see a car set up like this...

Here you go.

 

[MPNick]

Thats nice... I always thought using the stock MAF could be a pain to tune for boost. Too much tunning is needed in order to make it good.

Anyway, in the meantime im back again with the FMU and MPI to do some retard and pull out some fuel where the FMU sends too much. Feels very nice.

So Linux, the only "load" reference you use is the MAP, right? So now you are not "controlling" the stock injectors?

The MAF is the best way to tune. The MAP may be a little easier, but no where as good.

 

[MPNick]

Well I finally hooked up the MAP sensor tonight, and let me tell you, the car drives much smoother than before. Drives just like stock when not in boost. When I nail the gas, I am gone!! I need to retune my fuel map, but the outlook is promising!!

Something is not right. If the car is smoother now with then with how you had it before, the tune was not right.

 

[Dexter]

can you explain why MAF is better?

 

[MPNick]

I now understand...

the MPI was constantly fighting and trying to fool the stock ECU, even OUT of boost.

The MPI is only doing what it was tuned to do. If it was fighting out of boost it was tuned wrong. If you are only adding fuel with the extra injectors under boost only that sounds right. But you could have done the same with the MAF. You do not need the MAP to do that.

If you still think the MAP is better for you there is a better way to use it then you are now.