http://www.mafterburner.com/mafterburner_page2.htm

I hope to have it hooked up next week and then a friend of mine who has a spare LC-1 Innovate wideband wired to use with a cigarette lighter port will come down and help me tune in the A/F.

I had a stage 2 MAFterburner that I never installed because I was able to sell it for a nice profit and I didn't need the extra features. The one I just got is a stage 1.

So what can I expect as far as the A/F goes with the factory MP3 computer? Where is it rich and where is it lean?

After I install it I'll post pics, and then after the tune I'll post results. Hopefully by mid July.

 

Doesnt the ECU ignore the MAF at WOT ????

ABCDEFG...

 

Not on a Ford ECU it doesn't (don't know about GM, etc.). It does ignore the O2 sensors though. This thing works and it works well. I know a few guys having good results from them.

 

You are going to use it on your P5? So is it kind of like a piggy back? I have never heard of this. Can you help explain exactly what it is?

 

Its just a maf signal interceptor.
We run 14.7:1 below 3800 rpm (maf based) and after that we only use the O2 sensors to keep the a/f at 12:1. Lots of torque to be unlocked in the low end though.

 

At open loop on a Ford EEC the O2 sensors are not used. Unless Mazda abandoned everything that Ford developed for that ECU, then that is how it will work. If that was not the case, then why are MAF upgrades so critical on engines like those in my Lightning or any Mustang.

If the O2 is used at WOT on the P5, then I would think it would have to be a wideband in order for that to work properly. What you say sound more like a speed density system that DOESN'T have an MAF and instead used look-up tables that change based on MAP sensor input. Not adaptive adjustability (with in given paremeters) like an MAF system.

If Mazda does what you say, then why did they even bother with the MAF?

Do you have some literature on this I could see?

I could be wrong about the Mazda, but I would be suprised if they didn't work the same. That being said, even if they work the way you say, I should see gains like you said.

BTW, for jonesboy, look at the link I provided. It will explain it better than me.

 

The 02 clamp guys use on the MSP is for closed loop running, not open loop. WOT is open loop.

 

All I know is what ive seen with my own eyes and the measurments Ive taken. I can get the car to run lean untill 3800 rpm by playing with the maf.

But as soon as it hits 3800 we will run all over the place from 11:1-12.5:1 no matter what else I may have done. IDk maybe we swtich to speed density, it does make sense, and opens up some adjustability for us. Or maybe the maps are just nuts.

But seriously play around with it. If anything youll get a ton more low end torque.

Youd be amazed at how little mazda and ford share (at least in the 3rd gen). We have more mitsibishi parts then ford.

 

It is the maps that are nuts. The MAF has to be used throughout the whole operating range. That is how it works.

You said you have tried tuning. What kind of tuning have you tried?



The ECU controls injector pulsewidth based on the data it is receiving from the MAF signal. It tries to maintain the commanded air to fuel ratio in the base fuel table. For a naturally aspirated engine at wide open throttle, this is usually around 12.5:1. On a blower or turbo motor, this is 11.5-12.0 depending on a number of variables.

The MAF does another key function for engine control. It supplies data to the ECU so the ECU can calculate "load". Load is similar to volumetric efficiency, it is a measure of the engine's capacity to fill each cylinder with air/fuel. What's important is that load is used by the ECU for a number of things, two of the things are timing and air to fuel ratio. Generally at low loads, timing is much higher and fuel is much leaner than at higher loads.

 

Youve got the 2 liter so it could be diffrent.

But playing with diffrent intakes can cause the car to run crazy lean untill exactly 3800 rpm where the car runs totally rich no matter what else I may have done. Our mafs are seperete from there housing so we can use diffrent sized housings and watch the car flip out.

Playing with the fuel pressure gives similar results.

Hell if you can get it to work right on the 2.0 it might just apply to us.

 

I have heard just the opposite about the 2.0. I was told that the ECU on the 2.0 goes into closed loop mode at WOT and overides any piggy back system that is trying to manipulate the voltage. That is only if this thing is something similar to like a SAFC of some sort (piggy back). A lot of guys were getting good gains like 14 -20whp before closed loop mode came in a killed everything at WOT. There is a lot of power to be made in these cars just by changing the A/F ratios. And believe it or not those numbers were on 87 pump gas. This is only what I have heard though, it appears that Macdaddyslomo and I have heard the same thing about the WOT closed loop problem.

 

If this is true, then I am not going to even bother and just sell the device. $100 shipped.

 

works on only fords/mazdas? or for toyota etc?

 

Read the main link I posted for the device, but also read section 15 on this link.


http://www.mafterburner.com/faq.htm

It is being used on Hyundia cars right now too.

 

i read the main link, which is why i asked (only fords were listed but i knew ford has mazda )