Jim in Tucson

iTrader: (3)

I just 'upgraded' my ROM from 94170014 Tephra v5.1 to the new 96530706 Tephra v7.0.

Has anyone come up with any specific E85 settings in this new ROM that have been particularly beneficial?

Specifically I'm interested in improving idle, cold 'high' idle, and throttle hang.

Thanks,
Jim

laramie_05MR

iTrader: (20)

I'm not running V7 yet but will likely make the switch this weekend. I've been using V6t7. My idle lacks much to be desired but since I dont drive it that much I just deal with it. For some reason I have only experienced throttle hang maybe 4 times in the 3+ yrs of owning my car.

Laramie

0xDEAD

iTrader: (3)

I am running V7 on E85 and everything on my car is perfect. I am running ID1000's on the car. I have the EGR disabled in the periphery, the EGR advance table zeroed out, and the EGR duty cycle tables zeroed out (just for good measure). On E85 I run 6-10% more timing under partial throttle. I run about 45% less fuel in my IPW startup table which is now the first crank pulse? I zeroed out the cold start idle timing. I kept the max rich AFR table stock.

I can crank the car (with no feet on the pedals) and drive off in above freezing temps. The car runs a little bit lean for about 15 seconds but as soon as the narrowband kicks in she is good to go. I think this has to do with the E85 not burning completely when cold and it reads lean on the wideband because raw fuel in the form of droplets isn't mixing with the air. Car runs ~17:1 AFR during this short period. After about 15 seconds and having the car backed out of the garage she is good to go. I don't boost till its been up to temp at least 10 mins but it gets me down the street just fine and never complains.

I'm not doing anything differently than I did on any of the other tephra roms, so nothing specific to making this rom work any better or worse.

Jim in Tucson

iTrader: (3)

^^^^^^^
Interesting.

I have only been experimenting with enrichment while cranking. It seems counter intuitive to exercise enleanment, but I'm willing to try it.

Were you purposely attempting to attain the initial lean start up, or was that simply the result of experimentation? Everything else I read on E85 seems to favor enrichment during cranking. Just curious.

0xDEAD

iTrader: (3)

No, no, no. I don't want the lean during startup, it just happens. This happens to most E85 cars the colder it gets. The wideband just reads rich when I crank the car and start to take off. I don't let my car warm up I just start it and go. The car will stumble if you stab the gas during the first 15 seconds.

Also I incorrectly posted about decreasing IPW during startup. I meant to say that I added that much fuel when above freezing. When below freezing I have to add fuel exponentially. I don't start my car much below 10 deg F on E85 but I think the record between me and my friends similarly setup car is about 0 deg F and she fired up. It wasn't good and sometimes it will stall out on the first crank but you can get it up and running.

Sorry for the confusion.

Jim in Tucson

iTrader: (3)

I have finally completed my ROM transition from 94170014 Tephra v5.1 to the latest 96530706 Tephra v7.0, so I thought I'd post this follow-up for future reference. This is what worked for me, YMMV!

#1. The first issue is the Main IPW Adder Correction. The Alt Map IPW Adder (left panel) is correct. The right panel is the IPW Adder table for the main fuel map (I have my Alt maps set for 91 oct and the main maps for E85; I know some of you will be the opposite.) If your Main Adder Table looks like this, you need to make this correction. I first reported this anomaly on 11/04/09. I was struggling for weeks to get my car to start in cool/cold weather when a solution was finally posted on 11/24/09 by "ziad". THANKS!




#2. The Throttle Hang issue was first reported by "phenem" on 10/05/09. The solution that worked for me was posted by "simple_lancer" also on 10/05/09. Not sure if this is the "right" way to fix this or not. Zeroing out a table seems counter intuitive to me, but it does accomplish what I want.




#3. The E85 Cold Hard-Start info that I found most helpful was posted here by "mrfred" on 05/25/08, by "mplspilot" here on 04/13/09 and by "mrfred" here on 12/11/08. I've increased both the IPW Adder table (top pic) and the primer table (lower pic). Defaults on left panel and my settings on the right.




#4. The E85 Initial High Idle issue was addressed here by "leecavturbo" on 01/14/09. ISCV A/C off Neutral table (top pic) Desired Idle Neutral table (lower pic). Defaults in left panel and my settings on the right.




I will also say that the 96530706 is much smoother than the 94170014 and the throttle response seems to be greatly improved. I'm not sure how much of this is due to Mitsu improvements in the more recent ROM itself, but I'm sure a great deal of the improved drivability is due to the much higher resolution of the fuel and ignition maps. I didn't feel I needed load all the way up to 350, so I scaled mine to 300. This makes for very smooth transitions.

My hat is off to everyone that continues to contribute to the improvement of our ECU understanding and functionality. And a big THANK YOU!

fostytou

iTrader: (15)

I have posted it a few times, but I believe mrfred also confirmed that the desired inital ISCV position tables are incorrectly defined. They don't do what you think they do.

Jim in Tucson

iTrader: (3)

Worked for me! That's all I can say. Reduced high initial idle from 2K rpm to 1,500 rpm. The settings from "leecavturbo" reduced it too much, IMO, to about 1,100 rpm. YMMV!

MinusPrevious

iTrader: (3)

Jim in Tucson......Help me out please.....I certainly have the E85 cold start issue.....Ive been told that V5.1 (which is installed) has the enrichment map for starting. Is this correct or do I need V7?

Let me know please & thanks, Joe (So Cal Evo)

Jim in Tucson

iTrader: (3)

Joe, no IPW adder table in my V5.1, but I'm in an VIII.

I think there is an IPW adder XML by MRFRED, and he is in an IX.

Here you go. This is for an EVO IX 88590015 ROM. I presume this is the same as your ROM?

I would urge you to at least attempt an upgrade to Tephra V7. If you don't like it, you can always roll back.

GST Motorsports

iTrader: (8)

It's in the factory Rom, you just need the correct definition.

most of them are in this thread:

https://www.evolutionm.net/forums/ec...ent-table.html

- Bryan

MinusPrevious

iTrader: (3)

^^^Thanks Bryan & Jim......Very helpful..........MP =)

theopetridis

Just a question. How do you rescale the maps? You just change the value in the load column ? So if you put 110 in the 310 column and under that the timing-afr you want for 110 it will follow that for 110, although it's all the way across the board? Or do you make your 120 110 , your 140 120 and go on from there? Or you can do both?
Thx

Jim in Tucson

iTrader: (3)

I suggest using the very sweet BIGMAP converter. I'll try to find the link. It was designed for enlarging maps from OEM size to the Tephra V7 BIG maps, but it could still be used for rescaling same to same sized maps.

Not only do you change the values in the load columns, the formulas in the worksheet actually rescale the map values as well.

And, yes, rescale in numerical order. In my V7 ROM load scaling is:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300.

This makes for VERY smooth maps, IMO.

EDIT: Bigmap converter attached. I like this one the best, but I can't find the original post. RENAME FILE EXTENSION TO XLS AFTER DOWNLOAD.

theopetridis

thx Jim