Evo8 ECU in a 1G DSM in the works!
So, since the 1G doesn't seem to have a MAP sensor, how much is affected from no MAP signal? I know the EDM's doesn't even come with one so I wouldn't think it was too critical in this setup.
Newbie
Joined: Feb 2009
Posts: 1
Likes: 0
From: Wisconsin
What about adding an aftermarket map sensor? I just found out about using this ecu in a 1g so Im considering it over dsmlink. I read that speed density is possible on the evo ecu, so would that be possible to do the switch to sd with the ecu in a 1g?
Since I cross referenced the 99 eclipse ROM data in its RAW form (hex), I have the car running better than anything else I've tried thus far. I'm basically just editing my injector scaling to try and get my trims in the ballpark. I'm certain this car has a decent boost leak somewhere so until I get that confirmed I'm just wasting my time with airflow adjustments. Thanks for everyone's help on this topic. Decent headway has been made already.
So I have set my MAF scaling to DECIMAL (uint8) so now if I want to make adjustments in the Evo8 ECU I just need to add the MAF Adder DECIMAL value of 320 (140 hex) to my scaling values then calculater the percentage adjustment I want to make.
Example: to add 10% in the 75Hz area, take the decimal value of 132, add 320 to it to get 452. Then multiply by 0.10 to get 45.2
Then subtract 45 from the original decimal value of 132, so my new value for 75Hz would be 87.
(original MAF scaling value+ MAF adder)*percentage change= correction amount
(132+320)*0.10= 45.2 (rounded to 45)
original MAF value - correction amount = new MAF scaling value
132-45= 87
This seem like the best practice to everyone?
If so, add this to your ROM XML file and you can just use this scaling so you can edit your MAF Scaling with EASE.
You may need to change the ENDIAN to 'LITTLE' if you are using an older version of ECUFlash that requires it.
So I have set my MAF scaling to DECIMAL (uint8) so now if I want to make adjustments in the Evo8 ECU I just need to add the MAF Adder DECIMAL value of 320 (140 hex) to my scaling values then calculater the percentage adjustment I want to make.
Example: to add 10% in the 75Hz area, take the decimal value of 132, add 320 to it to get 452. Then multiply by 0.10 to get 45.2
Then subtract 45 from the original decimal value of 132, so my new value for 75Hz would be 87.
(original MAF scaling value+ MAF adder)*percentage change= correction amount
(132+320)*0.10= 45.2 (rounded to 45)
original MAF value - correction amount = new MAF scaling value
132-45= 87
This seem like the best practice to everyone?
If so, add this to your ROM XML file and you can just use this scaling so you can edit your MAF Scaling with EASE.
Code:
<scaling name="MAFScaling" units="Scaling+Adder" toexpr="x+320" frexpr="x-320" format="%.1f" min="0" max="575" inc="1" storagetype="uint8" endian="big"/>
Jack, the 140 adder is decimal.
Not having a MAP sensor doesn't cause a problem. Many versions of the 8 don't have it. It is not used on the US 8 for any type of fuel or timing lookup.
Ahh, ok thanks. I edited that post so the adder info was correct. Here is the new MAF Scaling formula with the maf adder already calculated in for easier MAF scaling adjustments, just add this to your xml file for your ROM ID:
Code:
<scaling name="MAFScaling" units="Scaling+Adder(uint8)" toexpr="x+140" frexpr="x-140" format="%.1f" min="0" max="395" inc="1" storagetype="uint8" endian="big"/>
If you prefer to keep the scaling in g/s, use this formula:
Code:
<scaling name="Airflow8+MAFadder" units="g/s (plus MAF Adder)" toexpr="(x+140)*321/256" frexpr="(x*256/321)-140" format="%.1f" min="0" max="461" inc="1.94" storagetype="uint8" endian="big"/>
Last edited by Jack_of_Trades; Aug 2, 2009 at 11:15 AM.
You totally can add a JDM (evo X) Map sensor (or equivalent) with a 1G. I work at a machine shop and would like to machine a simple adapter so people can add the JDM Map Sensor to a regular vacuum port on the intake manifold. You just need to add a GM Air Intake Sensor as well and you can convert over to speed density. I definitely suggest getting your car dialed in with a MAS first, it'll make it easier to do the switch with some solid data to work off of.
[/code]
[/code]
Others sell these as well.
You can skip it entirely though if you're going to use an MAF. Not having a MAP sensor wont throw a code or cause any odd behavior. I ran mine this way on my 2g when I switched to an evo3 intake. Jeff who makes the keydiver chips mentioned once that there is a diagnostic cycle that can be triggered by a certain drive pattern that could turn on a CEL but I'm pretty sure this is hard to do on purpose and nearly impossible to do on accident.
I plan on running ECU controlled boost with the JDM Map Sensor since its 100% plug n' play with the JDM map settings entered into the ROM. I used it with my Evo8 and I want to take advantage of the new patch with individual boost curves for each gear, plus a separate LAUNCH map now. Seeing as my car weight only 2400lbs and is FWD, I need as much of an advantage as I can get off the line to keep the 60' times low. She'll be running low 11's again soon.
Update. Well I have been fighting like crazy trying to rescale the MAF in the ECU to no avail, so I pulled the MAF out to inspect it and it is 100% unmolested so it was either a bad MAF or I was getting turbulence from the home depot coupler hackery that was on it when I got it. It is a 4" to 3" coupler with NO taper, the air literally was hitting a wall in the coupler. So I readjusted the coupler and went for a ride and sure enough the MAF scaling was way out of whack again just from slight movement of the couplers location so I was certain it was the coupler causing erratic readings.
I borrowed an aftermarket MAF intake pipe from a friend tonight and I was dead right. Within no time I had the MAF and injectors rescaled to with 1% LTFT's with no more than +/-2% swaying in the STFT during cruise! The car feels like new and I bet its the smoothest this thing has run in a long time.
I borrowed an aftermarket MAF intake pipe from a friend tonight and I was dead right. Within no time I had the MAF and injectors rescaled to with 1% LTFT's with no more than +/-2% swaying in the STFT during cruise! The car feels like new and I bet its the smoothest this thing has run in a long time.
Hey guys, i had a quick question pertaining to both my 1g and 2g. I have a 95 gst with a 1g head that im building. It has the 91 cas and 2g crank sensor. So, my plan was to buy the magnus cable to convert the 91 cas and crank to the stock wiring harness. The problem though, is the RRE conversion says to swap pins on the ecu to make the spark correct.
http://www.roadraceengineering.com/1...waptechtip.htm
My other problem is, what must i follow in order to make the cas correct? What wires must be swapped to make it work. I know the 97-99 had a cas, but its different than a 91. Which one should i go with, or does it make a difference. Lastly, i know the evo ecu has speed density support, what is the best way of getting that working? I spoke to "the mork" who said to use the mdp off the 2g and slice that for the aem or gm sensor, and then wire a temp sensor into an open port, but im not sure how to do that. Any good threads or posts on that?
Thanks
James
http://www.roadraceengineering.com/1...waptechtip.htm
My other problem is, what must i follow in order to make the cas correct? What wires must be swapped to make it work. I know the 97-99 had a cas, but its different than a 91. Which one should i go with, or does it make a difference. Lastly, i know the evo ecu has speed density support, what is the best way of getting that working? I spoke to "the mork" who said to use the mdp off the 2g and slice that for the aem or gm sensor, and then wire a temp sensor into an open port, but im not sure how to do that. Any good threads or posts on that?
Thanks
James
Last edited by VETTE_50_TH; Aug 4, 2009 at 09:03 PM.
https://www.evolutionm.net/forums/ec...y-patches.html
https://www.evolutionm.net/forums/ec...t-success.html
You're going to have a lot of reading to do but IMO it is worthwhile to read the first success thread twice.
As far as the CAS issues you should be able to put a 2gb CAS on a 1g head right? I would do that but like I said earlier it isn't a subject that I know a lot about. After that it will be just switching pins so you could skip the cost of the harness
https://www.evolutionm.net/forums/ec...t-success.html
You're going to have a lot of reading to do but IMO it is worthwhile to read the first success thread twice.
As far as the CAS issues you should be able to put a 2gb CAS on a 1g head right? I would do that but like I said earlier it isn't a subject that I know a lot about. After that it will be just switching pins so you could skip the cost of the harness
Using the JDM Map sensor (Evo X) gives flawless readings and is accurate to .1 psi and capable of up to 35 psiG I believe. Can't go wrong with the price and simplicity.
James
You could call a Mitsubishi parts dealer or your local dealership...