COP settings in tunerstudio - troubleshooting
 

Hi!

I have read other threads the whole evening searching for setup values for the Toyota COPs in tunerstudio.

I'm experiencing a massive drop in revs when holding the engine at around 4000rpm with no load. (need this for emissions test)
The revs drop immediately and catch up just before 2000rpm and then its revving smoothly up to 4000rpm when the drop is coming again.

I guess this could be caused by a wrong setup for my Toyota COPs.

Could someone please confirm these settings?

https://www.miataturbo.net/attachmen...ine=1398718340

https://www.miataturbo.net/attachmen...ine=1398718340

Thanks a lot!
Michael

Ok... i found some values. :noob:

cranking: ~3.5 to 5.5ms
normal: 2.5ms

So mine are a bit off.

But what about the other values my workshop has dialed in when they installed the MS about two years ago?

Cranking Advance(degrees): 18
Spark Hardware Latency(usec): 15

Do you have yours wired up for individual coil firing or do you still have it set up as a wasted spark system with two of the coils firing for each spark event? I notice that you still have it set on "wasted spark".

Keith

Harness is still the one i built for use with the OEM ECU back in 2009. So jap, wasted spark.
https://www.miataturbo.net/useful-sa...writeup-12704/

How modded are you? How are you getting by TüV?

I'm probably taking up a job in Germany come October but I have no clue what's involved if I want to bring my miata with me

it's not your cops...

Uhhh - lets say its a pita, but i have no experience in doing this. Just read some articles in oldtimer magazines.

Getting a German registration for import cars can be a lot of trouble. If the car is modded, it is getting worse.

There are specialized workshops for import cars. Some are even specialized in importing modded JDM monsters that come to the continent via the UK or directly from Japan. A google search will get you some contacts.
To which city will you move?

Ok. Good news.

But what could the cause of the drop in revs be?

In autotune mode, tunerstudio says "overrun" for a millisecond or so when the problem occurs. The AFR goes lean after this.

So IF the Cops would be the problem, the AFR schould go rich instead of lean...

Injector setup... I will look it up and post the settings tonight.


EDIT: I guess i should check the "Overrun Fuel Cut" settings. ;-)

that would be a good start.

or just log in general and post it and we can see what's happening, could be a number of things; bad tuning mostly all of them.

The fuel cut settings....
https://www.miataturbo.net/attachmen...ine=1398889113

corrected
https://www.miataturbo.net/attachmen...ine=1398889113

Logging session is planned for tomorrow.
Is there a suggested logging profile, or is it ok to log all data fields?

You need to hold RPM steady at 4000 RPM correct? So, you need to set the "cut fuel when RPM great than" block to 4500 RPM to keep from having fuel cut at low load / low throttle position for your emissions test... you just set it down to 1500.

Perhaps setting the throttle position to 2% instead of 5% will correct your problem... but setting the RPM down to 1500 could lead to idle problems. If you also have a portion of the emissions test at idle you need to bump that back up to at least 2500.

I think what I have said is correct... but if an expert contradicts me go with their advice :D

Keith

Thanks for the input. I will test the settings today and if its still going into overrun i will change it to higher rpms or maybe i will simply turn this feature off for my emission test map.

Michael

kpa lower than should be below what you idle at... overrun should only be active when you're coasting, in gear, without throttle. The best way to ensure that is to make sure overrun is only active when you're pulling massive amounts of vacuum. Plus you don't want to set it up so it keeps pulling fuel while you are in 5th gear at low rpms and light throttle, or trying to maintain 4K with less than 40kPa of load. the way you have it currently set, I can imagine that being an issue.

But yes, these awful overrun settings seemed to be your issue, not sure who's ass you pulled them from, but I suggest using a better method of tuning your car than arbitrarily inputting values and then posting about why your car sucks over here...

two door's advice is complete incorrect and without merit. complete offensive intended. :)

Hi there!

Here is my log. Car runs very well related to the initial tuning.

I also corrected the AFR Map to what is widely suggested in this forum. It was set to 13.5 everywhere.... My daughter was born that year, so i decided not to DIY tune my car at that time and gave it to a workshop.

LOG
https://dl.dropboxusercontent.com/u/...1_14.21.27.msl

corrected AFR Table
https://www.miataturbo.net/attachmen...ine=1398952503

As far as i can see, my dwell time is too high. It is between ~2.7ms at 13.4v and 2.93ms @ 13v.

It should be 2.5ms for Toyota COPs, right?

So i need to correct my Dwell Battery Adjustment Table.

Bevore i start... Are the values in my log reliable enough to finetune the correction table, or is the Voltage not the same at the ECU as it is at the COPs?

Same question for the Dwell values. Are they reliable enough to change something?


I would try the correction table Zaphod posted here and set my Dwell to 2.1ms, as Braineack posted!? https://www.miataturbo.net/megasquir...ota-cop-44131/



Michael

I had the car for installation and tuning of the MS, cams, adjustable cam gears, and highflow cat at a workshop and was totally confident, the tuning will be everything but arbitrarily.

Now that i looked up the details in tunerstudio, my bad impressions driving the car since then are confirmed and i have a clue why my autocross season was not that successful that year. :vash:

I hope i won't find other settings that are tuned this badly. My DD, a stock NB is pulling way better than the modded lightweight racing prepped NA. Ok, the NB is a 1.9l, but before i had burned my money on tuning the racecar it was clearly the opposite situation.
Maybe i should start from the scratch, confirming all the settings that were made. The cam adjustments at the cam gears and the ignition table will get my attention once i hopefully passed emission test tomorrow.

set it like this:

https://www.miataturbo.net/megasquir...e3/#post895612

Dwell set to 2.5ms and corrected the curve to match 2.5ms instead of setting it to 2.1 to get the correct timing with the wrong correction curve.

Is that ok?

https://www.miataturbo.net/attachmen...ine=1399058349

Emissions test PASSED ;)
Car runs better than my stock NB and starts even better than stock.

Next:
- Understanding and optimizing acceleration enrichment.
- Understanding and optimizing engine valve timing
- Understanding and optimizing ignition table