That would be great!

 

Jamie

Thanks for your help BTW! You've been a great resource for me and a stand up guy!

I had the same problem with EvoScan. I fixed it by running the offline test mode. Close out of the program and open it. It was fine after that.

 

Thanks for the kind words. I'm glad to help when I can. Its hard to try and toss a few bones to you guys without giving away the things that keep food on my kids plate lol. I'm one of the few pro tuners that actually contribute to this section these days for that same reason. Most of them just troll for info and give nothing back. I kinda leave 'clues' all over the forum and the smart guys will pick them up and collect them

-Jamie

 

It's about -5 C* here. Whenever I cruise or idle MUT11 shows ~5-15*C. In the warm start situation I log ~35-40*C.

The car fires right up, revs to ~1800rpm, falls down to ~1000, and begins to run really lean. My LC1 shows 20-ish AFR, the car lopes really bad and almost dies.

If I help it with throttle, it takes about a minute to stabilize rpm and afr. Mut11 slowly falls down to 25-ish and AFR comes back to 14-15-ish.

I have tried raising MAF Comp vs Coolant Temp. But that didn't help at all.

 

Where is your IAT sensor mounted currently? You don't want to adjust MAF comp vs. coolant temp for this issue as it will affect the entire tune when there isn't a heat soak condition. Adjusting the Post-cranking IPW added table will help as it stabilizes a bit but the only way to really resolve it is to move the IAT sensor. Anything else will basically effect things when the heat soak issue goes away after airflow cools the sensor.

-Jamie

 

My GM IAT sensor is mounted in my inlet manifold, next to my JDM Map, as on JDM Evo9. I am also concerned about meth nozzles, as I have two of them. Both are in the AMS short upper IC piping. One is 10" from the throttle and another is ~12" from the IC.
Where should I put my GM IAT? Is it bad if IAT sensor will be exposed to meth?

Is that correct table to adjust? I have stock values in it

 

Ideally you want the sensor mounted on the lowest part of the upper intercooler pipe, just after the outlet of the FMIC. Be sure to have the sensor mounted on the top half of the tubing so any moisture in the pipe doesn't puddle in the sensor, just like is recommended for a Wideband sensor.

Look up the thread I recently created labeled 'Fuel and ISCV Startup Tables' or something like that.

-Jamie

 

Where should I put IAT relatively to meth nozzles?

 

Before meth or water injection nozzles, ideally in the exact location I had suggested in the previous post.

-Jamie

 

Here is the ideal location for minimal heatsoak. Try and keep the bung on the top half of the circumference of the piping so moisture doesn't puddle in the sensor.



-Jamie

 

Thank you!

My meth nozzle is placed over there just a few inches further from the IC. I'll check if I have enough place or if I have to move meth nozzle.

 

You would want your meth nozzle closer to the throttlebody if you are actually running meth. You're basically just coating the entire UICP with liquid and not as much is making it to the cylinders. If its just water to cool the air charge, that would be fine. I generally place the meth nozzle on the 90* bend just before the throttlebody so it's spraying directly at the throttlebody.

-Jamie

 

Ok, I figured out that my start-up issues are most likely not heatsoak-related as I am having the same issue on cold starts.

I have tried modifying Post cranking IPW adder, but didn't get any noticable improvement.
Then I tried setting the IPW Multiplier vs Coolant Temp much higher than stock and finished at:
1.99219
1.89844
1.79688
1.74219
1.59375
1.44531
1.35156
1.25
1

That gave me noticable improvement in AFR, but it was still a bit lean and didn't solve that issue on warm starts.
I've made a log of a cold start where you can see idle revs fluctuations and unstable AFR. Hope someone can presuppose the root of the problem.

I am also thinking if my IAT calibration is set correctly? How should i check it?

 

I looked at your log. I'd need to see the ISC Steps and WB too.

Your steps are probably going up and down causing it to run lean for a second then fuel catches up. Then steps are probably going down because idle is past target idle. Then idle gets too low and steps and fuel are trying to catch up, but it's too late and it dies.

What's your target idle table and idle error table look like? This doesn't exactly apply to your situation, but it may help a little: https://www.evolutionm.net/forums/ec...cv-tables.html post #2. Since it starts and idles for 15 seconds before the fluctuating it may not help, but a great read nevertheless. Thanks Jamie for this!

I can take a look at your rom if you want. My email is: 10isace@gmail.com

 

I recommend leaving the last 2 rows set to 1.00 for that table. I consider 171*F (77*C) and higher to be at operating temp and doesnt need enrichment anymore.

There is a setting that adds a certain amount of ISCV demand when rpm drops below 500rpm, this is probably what you are seeing (I didnt look at the log).

-Jamie