Custom OS#5

What tordne said is pretty much exactly what I did. Except I did limit mine down to under 3000rpm and below 25% throttle. It's pretty difficult to really get good values outside of that area. (Difficult enough to fill up the lower section of the table as it is)

You will want to make sure DFCO is off, it really throws alot of cells out of wack with values wanting TONS more fuel. (I saw lots of 1.3+ BEN factor values in mine)

I found the TPSvsVE table most helpful in my idle region since I have a cam with 24-degrees of overlap (hence very low vacuum and quite erratic)

Anyone run cats with this OS? is it hurtfull for the cat to run at 15.5:1 cruising? will it heat them up too much???? Does COT work with this OS?

Nope Holden stock OS runs up to 17:1 on lean cruise for hours so their cats survive tens of thousands of warranty miles ok. I think its too much fuel that really hurts them.

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Originally Posted by ringram

I think its too much fuel that really hurts them.

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Correct. Which is why cams with lots of overlap kill catalytics. The cats really like to stay at or above (within reason) stoich.

OK i am not certain of the best way to set up the Throttle % Data table.

I have logged some driving and used the VE table lookup pid.

I have also setup 2 tables - with Throttle % vs RPM (same as the table) another MAP vs RPM same as VE table. Do i get the values by looking at the peak VE numbers and getting a spreadsheet to calculate the % for me to put into A0007 ??

I am trialing it on my car and will aim to see if i can further improve the control of AFRs at low rpm and low throttle under 2000rpm.

Read my post above - it is precisely how I did it when I wanted to test/play with it. Once you get the base numbers I changed the MAP data to be BENS, basically to fine tune the table. Worked very well!

Ross, this TPS VE Table is great. Really helps out low rpm driveability with a large cam. Is there any chance you could make the rpm jump every 200 rpms instead of the normal GM jump of every 400 rpms? I have seen my AFR be off alittle say at around 1800 or 2200 rpms. I know I am being picky, but a higher resolution on the rpm scale would be awesome. :cheers:

John, the issue is GM have some specific routines for RPM lookups that were done in a way to minimise CPU overheads, changing the breakpoints is not a simple task. However, keep in mind with table interpolation it is not jumping from one cell to the next, having said that, there is nothing you can do to the values in between.
Anyway, glad it has helped out somewhat.

Cheers,
Ross

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Originally Posted by GMPX

Just two to start with.
One for the Aussies to replace 12225074.
One for the 2002 F&Y bodies to replace 12212156
If you are already running a custom O.S based on one of those O.S's then all existing tunes are compatible.

Setup suggestions.
A0003 - Set to disable for now until the tutorial is done (or you are feeling brave).
Download here -
http://efidownload.iqd.co.nz/softwar...5_OS_Final.zip

Cheers,
Ross

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So does this mean I can not use COS5 if I have a 2001 using COS3?? Is this true?????

Bill

I have just settled with my car using 129005 with the tps enabled under 1200rpm. This is helping it idle better and transition better. Its worth doing with a car with a modded cam and is pretty easy.

I will be using this operating system with 'cammed' cars from now on.:)