COS 5 Question..

[tatasta]

Hello,

Just a quick question regarding the installation of a custom operating system:

About a month or two ago, I had installed COS5 in my 99 Trans Am. I had alot of trouble with it and gave up. I loaded my factory OS back up and have been running it since.

I have learned alot about tuning since then and I'm considering putting COS5 back in for the options it gives for nitrous tuning.

Finally the question- Can I load my old COS5 tune all together? Meaning, change the OS AND load the calibrations or do I have to load the OS THEN load my calibrations?

Thanks

[joecar]

Bob,

Are you currently running 12212156...?

If you are, then you do this:
- full flash of 02020005 (COS5),
- cal only flash from 12212156 (i.e. your parameters/tables),
- read the PCM and save to file,
- fix the out of range cells,
- initialize any other tables (see attached, make sure TP VE table is disabled),
- save to file,
- do cal only flash.

Car should now run on COS5 as well as it ran on 12212156.

[tatasta]

Joe,

No, I'm not running 12212156 right now. I am back on my 99 OS. I still have my 12212156 tune that I used last time. It just needs to be updated with my new calibrations. I also have completely fixed my previous COS5 tune (attached) that was in the car when I tried the first time.

That was the reason I was wondering if I could load the COS5 tune, operating system, cals, everything, all at once. I noticed that there is a function to load OS and calibrations together.

Is that not recommended?

Thanks

Edit: Now it's attached...lol

[joecar]

Bob,

I'm sorry, I have been away for a couple of days...

If you copied your tables into the COS5 file, then you can certainly do a full flash (os plus cals).

[joecar]

In B3647 you may want to make the upper right part of the table richer... for example, what will happen when you open the throttle part way (avoiding a downshift) when RPM is below 3200 rpm...?

Same comment for B3618.

[tatasta]

Joe,

Thanks for the help. In your opinion, which looks more like the appropriate settings for B3647 on my N/A H/C 346? Also, I attached the adjusted tune if you would like to look at it.

B3617, that should be set to 0% or no enrichment, correct?

My MAF and VE are dialed pretty well dialed in. Should I be aiming to get away from using the MAF all together?

Just for reference I have changed injectors and have the correct values in the IFR table.

Thanks,

Bob

[joecar]

I like B3647_2 better.

You can set B3617 to stock (gives richer AFR when ECT is cold which is good).

You can run with MAF/VE (set B0120 to 4000 rpm).

What is your maximum RPM...? In your B0101 VE table, make sure that the RPM row that corresponds to your maximum RPM (6400) is correct (blended with the next row down)... look at attached image... oh, that green area is probably never hit, so it's ok...

otherwise tune looks good, good job......how does car run...?

[tatasta]

Thanks Joe,

I set B3618 back to stock. How will B3616, B3617 and B3641 affect the COS? Will my current settings still work or could there be a conflict with B3647?

I think that is my last question until I get this loaded and logged.

Thanks!!

[joecar]

...
How will B3616, B3617 and B3641 affect the COS? Will my current settings still work or could there be a conflict with B3647?
...

Those are fine as they are.

You may find that during warmup your commanded and wideband AFR's may not match (they will match by the time the engine reaches operating temp)... to fix this you will have to edit A0008 (as you have done).

[tatasta]

Joe,

On my standard OS a couple weeks ago I had to search a little to see where some of my advance was going under WOT. B5910 appearer to be set correctly but when I reviewed a log file, I resized the scan tool to the tune tool and I noticed that B5910 was showing my ECT at 140* C. Obviously, this was not correct. My actual ECT runs at ~ 90* C but on the B5910 table, at140* C the stock tune pulls 6* of advance. I changed the table to zero retard and, yep, that was where my advance was going.

So first, why do you think my ECT was reporting incorrectly on this table but not others?

And, in my COS, should I zero out any tables that may retard my spark so that my high octane table is all that is used once the engine is warm?

I know this is a bad idea but what is your opinion on spark setup?

Bob