E-Manage powered Mazdaspeed!

[servoeyes]

I'm new to the whole tuning thing here, but what's up with the open loop (pre ~2.5k right?) section? Is it supposed to be that lean in that area?

 

[Chojin]

servoeyes -

Here is a basic explanation:

Closed Loop - PCM wants the air/fuel ratios as close 14.7 as possible for fuel economy purposes.

Open Loop - PCM switches to different fuel and timing maps for higher power output - lower a/f ratios.

-Shawn

 

[AutoBox]

hey turboge do you have a pic of ur a/f ratios before you tinkered?? would like to see how rich our cars really are....

 

[Speedy]

How about a Greddy A/F? Do that work as a wideband o2? What is the best A/F Ratio for the MSP?

 

[Chojin]

AutoBox -

Here is the A/F ratio graph of an Non-Flashed MSP:

Here is the A/F ratio graph of a Flashed MSP:

I know this is not Turboge's MSP, but it will give you an idea.

Speedy -

Most tuners shoot for a 12:1 A/F Ratio on boosted cars.

Hope this helps.

-Shawn

 

[MP3skaterNC]

HAHA, mazda sure did alot to change the fuel maps on the flash. They just went crazy with timing.

 

[servoeyes]

servoeyes -

Here is a basic explanation:

Closed Loop - PCM wants the air/fuel ratios as close 14.7 as possible for fuel economy purposes.

Open Loop - PCM switches to different fuel and timing maps for higher power output - lower a/f ratios.

-Shawn

Thanks Shawn! Ok, so that explains it...basically. I had a feeling it was something to that. I'll have to do some more research before I tinker!

 

[YP5 Toronto]

How about a Greddy A/F? Do that work as a wideband o2? What is the best A/F Ratio for the MSP?

The Greddy A/F is the closest you will come to a Wideband. It is a great unit.

 

[AutoBox]

THANKS chojin...that is exactly wat i wanted.....at least i know why the car comes back tto life after 5500...its not swiming in gas anymore.....god man its off the chart.......oh also what wide band do you guys recommend...something good but relatively cheap pleas e

 

[Chojin]

AutoBox -

Check out this one by Innovate Motorsports. It's a very nice unit and priced very reasonably.

-Shawn

 

[BinaryRotary]

Whats the technical name for the small box that holds the resistor?

 

[Kenetix]

Its about time someone figured this s*** out. Good luck MSP guys.

 

[jus10 msp]

good job. i'm going to put my e management back in my car and i will get terry to tune it after the first of the year. hey are you haven any problem with the fuel cut? i can't wait to put it in. all i can guess is it was wired wrong in my msp. i will follow your directions and give it another try.

thanks justin h

keep us posted

 

[EVILSRT]

Its about time someone figured this s*** out. Good luck MSP guys.

Back from the dead eh???

 

[turboge]

Update 12-20-03:

I just got back from a crazy party out in Irvine and had a chance to do some tuning. From what I can gather, people have said not to "add" fuel in the Airflow Adjustment table....but with our car this is not the case.

The best way to think about how to tune this car is to look at the "Airflow" map as a 0-80% TPS fuel adjustment map. And the "Additional Injection" Map as a WOT map. If you only go about adding fuel in the Additional map and not in the Airflow map, the transitions will lean out and you will experience more hesitation.

I'm currently working on tuning partial throttle because I rarely go WOT. The car now transitions into open loop as soon as it sees over 1psi of boost and it has become tricky tuning it.

For beginners, the car will take a while to "Learn" when it hits boost, so I'm hoping that after a while the maps will be clean enough so that I can reset my ecu and still retain good tuning.

I will be out of town for the next 2 weeks with limited access, so to everyone following, have a happy holiday season and a great new year!

 

[falkofire]

merry Christmas!

 

[CustomMSP]

Happy holidays!

 

[shaolin]

Wow this thread has been educational...Turboge you have a PM...

 

[BinaryRotary]

So basically a 1k ohm resistor wired with the MAF output from the PCM and we can run just about any A/F controller?

 

[turboge]

Binary Rotary - It could or couldn't, I won't make the assumption for you. In theory it may, but these are 2 different boxes.