Evo 8 ECU In 2g Works!!

[JamiesTSI]

On my 97'

A---Black with gray dot
B---Green with yellow tracer
C---Green with black tracer

 

[clockworktoy]

I did the same thing as the link above, using the MDP wiring harness.

 

[knochgoon24]

Well then. Looks like I'll be wiring the IAT off the MAS harness. I wasn't sure which method was used.

 

[the_mork]

I didn't do it that way, my IAT sensor is wired into the fuel temp input. It was a cinch and made switching between SD and MAF much easier while I was still dialing everything in. If you use the fuel temp input there is absolutely no hardware change necessary when switching back and forth. The wiring is simple and then you don't have to hack anything up.

 

[jjgrizz73]

Thanks guys, appreciate the quick responses! I'll have to look into more of that IAT wiring you mentioned mork...

 

[Ceddy]

Does anyone have RPM/Speed Ratios for 2G 5 Speed they could post?

And has anyone with an Auto tried logging RPM/Speed?



Thanks.

 

[clockworktoy]

My IAT is wired into the fuel temp input as well because that's the default in the SD rom. And ceddy ill post up my ratios as soon as i get my laptop back.

 

[the_mork]

Here are the RPM/speed ratios for my fwd automatic.

6 - 0.973451
5 - 0.973451
4 - 23.9823
3 - 46.0177
2 - 63.0088
1 - 105
0 - 1801.9

 

[Ceddy]

Here are the RPM/speed ratios for my fwd automatic.

6 - 0.973451
5 - 0.973451
4 - 23.9823
3 - 46.0177
2 - 63.0088
1 - 105
0 - 1801.9

Thanks.

Sorry I'm not that familiar with Autos, does the Torque Converter effect the ratio also?

On my XJ, the TC has a ratio of like 1.8:1, but when it locks up it goes to 1:1.

 

[the_mork]

The torque converter on a 2g locks up eventually and acts as a 5h gear IIRC but I've never bothered to log it because the way that the tephramod code works it snaps to the closes value and I really don't have any reason to use different boost settings above 3rd.

I MAY have a log that shows it if you're looking for a complete table so I'll do a bit of looking around. Hopefully I can find it. I'm pretty confident in the rest of the numbers though. Otherwise I suspect if you put 19 in the 5th gear box it will probably work just fine for the lockup.

 

[the_mork]

My rom was requested so I thought I might as well put it up publicly. This rom is slightly deprecated in that it does not have the new SD low RPM IPW cutout fix and there are a few things I still need to fix such as cleaning up my fuel and boost maps but otherwise it should be a good example for newbs and should also get you a workable starting point for anyone switching to SD. FWIW cold start low rpm driving on this rom is piss poor.

 

[knochgoon24]

All my parts finally arrived for the switch to SD. I may give it a shot this weekend. The weather should be half decent Saturday so I can get the wiring done.

 

[the_mork]

I was just thinking that we should be discussing something in this thread.

Good luck with the switch. Have you looked at the newer developments with SD including the new IPW dropout fix? My car ran okay without the fix but I would have liked to have tried it before putting it away for the winter.

 

[knochgoon24]

I was just thinking that we should be discussing something in this thread.

Good luck with the switch. Have you looked at the newer developments with SD including the new IPW dropout fix? My car ran okay without the fix but I would have liked to have tried it before putting it away for the winter.

Yeah. I think I'm just going to start with a clean rom. I also read about the IPW fix. Even though I haven't messed with it yet. I'm getting the IAT in tonight.

I have one question though, how can you log the MAP while still having the MDP connected? Even if I have to wire it in differently, I think having a few IAT and MAP logs with all the MAF computed loads would be nice.

 

[the_mork]

Why would you want to? The MDP is only for EGR function and wont give you any useful data ever. I ran my car without one for months before I ever had a MAP sensor.

You can always wire the MAP sensor into a different input but I think that would be a lot of useless extra work for no gain unless you really think you need the MDP sensor for emissions testing or the like.

 

[knochgoon24]

Why would you want to? The MDP is only for EGR function and wont give you any useful data ever. I ran my car without one for months before I ever had a MAP sensor.

You can always wire the MAP sensor into a different input but I think that would be a lot of useless extra work for no gain unless you really think you need the MDP sensor for emissions testing or the like.

Oh. I actually wasn't sure what the MDP sensor was controlling. If it's just the ERG, my EGR has already disabled through the periphery bits. I haven't been using it for quite some time.

Nice. Thanks.

In that case, the SD will surely get installed tomorrow.


EDIT:
Another question.
Has anyone else tried logging the A/C switch? My results suggest that the ECU is not seeing the A/C being on correctly. Either that or the Request ID I have to the A/C switch is wrong.

The reason I ask is that my car doesn't bump the idle up with the A/C on. I've changed the idle points for the A/C on in the rom I'm using, but it doesn't seem to make a difference.

 

[knochgoon24]

I got the MAP sensor in today. It's nice being able to log boost. We'll see if I can get the IAT in tomorrow, but the forecast isn't so good.

 

[hediki12]

so i just ordered my aem 3.5bar map sensor any one knows the xml for evoscan or mitsulogger to log it? (SD comming soon!)

 

[knochgoon24]

so i just ordered my aem 3.5bar map sensor any one knows the xml for evoscan or mitsulogger to log it? (SD comming soon!)

That's why I just went with the GM 3 Bar. It rained all day today, so I didn't get the IAT sensor in.


You'll need to use request 38 if you have it wired into the MDP sensor wires.
The ECU will output 0 for 0v and 255 for 5v.
Do you want to log kPa or psi? Gauge or absolute?
0.5v is -14.7psi
4.5v is 35.3psi
It's linear between there.

That should be enough for you figure out the equation.

 

[hediki12]

That's why I just went with the GM 3 Bar. It rained all day today, so I didn't get the IAT sensor in.


You'll need to use request 38 if you have it wired into the MDP sensor wires.
The ECU will output 0 for 0v and 255 for 5v.
Do you want to log kPa or psi? Gauge or absolute?
0.5v is -14.7psi
4.5v is 35.3psi
It's linear between there.

That should be enough for you figure out the equation.

yea i know the voltage to psi value and that its linear.. but i have no clue on how to write the xml equations... can you give me some insight on how to? any one?

i guess i want to log psi...

 

[delta448]

Found at the bottom of the page.

Logging Boost in EvoScan/Mitsulogger

MAP sensors do not know the local atmospheric pressure. To log boost in psig (what all boost gauges show and what people always use to discuss boost values), the conversion formula for the logging program needs to have an offset for your local atmospheric pressure. The general formula for the JDM Evo 9 MAP sensor is:

0.19347*x-b

where b is the local atmospheric pressure. The local atmospheric pressure is affected strongly affected by altitude. For example the pressure at sea level is 14.7 psi, but at 5000 ft, the pressure is 12.2 psi. That's a big difference when you want to log boost. Use this table of altitude vs pressure to determine the offset pressure for your formula:

altitude (ft) local atmospheric pressure (psi)
0 14.7
500 14.4
1000 14.2
1500 13.9
2000 13.7
2500 13.4
3000 13.2
3500 12.9
4000 12.7
4500 12.5
5000 12.2
6000 11.8
7000 11.3
8000 10.9

*For example*, if you are living at 750 ft, then you'd want to use 14.3 psi as your offset, and the formula would be

0.19347*x-14.3

In the following instructions, please use your formula in place of the words FORMULA HERE.

For EvoScan 0.99+, the MAP logging definition in the Data.xml file should be changed to:

<DataListItem DataLog="Y" Color="" Display="JDM MAP" LogReference="JDMMAP" RequestID="38" Eval="FORMULA HERE" Unit="psig" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-15" GaugeMax="35" ChartMin="-15" ChartMax="35" ScalingFactor="1" Notes=""/>

To log boost in psi in Mitsulogger, the MAP logging definition should be changed to:

<Request LogReference="JDMMAP" RequestID="38" Eval="FORMULA HERE" Unit="psig" Logged="y" Response="2"/>

 

[hediki12]

Found at the bottom of the page.

thats for the JDM map sensor.. totally different calibration.. acamus gave me the proper equation for the AEM 3.5BAR map sensor its 50/229x-b

b=psi for local elevation

 

[delta448]

Right.
I was just showing the code to write, the exact math formula isn't the same.

I'm sure this is a dumb question, but can I ask how the math ends up as 50/229x-b?
I would've used something else...

 

[knochgoon24]

I didn't notice the pressure deviation by elevation was that great. I'm at 2000-2500 ft. where I live. It looks like I need to set it at 13.6 instead of 14.5 that I'm using.

It snowed last night so the IAT sensor still isn't in. I hate not having a garage.

 

[clockworktoy]

I set my atmospheric pressure by logging while the car was off and till i got it close to 0. Worked great for me.