Custom OS#5

[joecar]

Was the tutorial ever completed for this or am i over looking it? I am having a bit of trouble following the info in this thread

..RJ..

This thread contains the info required if you want to run the TPS vs RPM VE table (if you have a cam with much duration/overlap giving you poor vacuum, or just for kicks )... a.k.a. alpha-N.

I'm sure we'll eventually add this info to the COS tutorial.

[Doc]

Please somebody correct me if I am wrong but, does COS OS#5 exist for 2003 or +up? Any plans? I've got a truck that needs support for the juice.

[2002_z28_six_speed]

So, basically in COS5 there is no way to run the car a little richer during warm ups? Because {B3605} has been altered.

[SSpdDmon]

So, basically in COS5 there is no way to run the car a little richer during warm ups? Because {B3605} has been altered.

I was wondering why our cars do this from the factory??

Thinking about it....carb'd motors don't have fueling change from cold start to warm up. I think that the OL table has richer values because that's when the O2's are still warming up. So, it's more of a safety feature. If you're going to be dialing in the tune and monitoring it every now and then, I don't know if you really need the factory safety feature of richer AFR's post startup.

[Doc]

So, basically in COS5 there is no way to run the car a little richer during warm ups? Because {B3605} has been altered.

That's what {A0008} is for.

[2002_z28_six_speed]

Doh! There is it. Must have been the Camo hat which threw me off! Thanks Doc.

[2002_z28_six_speed]

I was wondering why our cars do this from the factory??

Thinking about it....carb'd motors don't have fueling change from cold start to warm up. I think that the OL table has richer values because that's when the O2's are still warming up. So, it's more of a safety feature. If you're going to be dialing in the tune and monitoring it every now and then, I don't know if you really need the factory safety feature of richer AFR's post startup.

Right. Well this depends from motor to motor. Some carbed cars had chokes and some didn't. I don't even think race carbs have them at all. Forgive me I haven't touched a carb since about 1998. Good ridance really.

I drove a car without a choke for awhile. Pumping the gas helped it start right up just like a choked carb.

Anywho, the theory that you are talking about hmmm I guess it is kinda of illusive. I was always told that it takes more fuel to start the engine + the heat of the engine helps to evaporate the gas. Pour more fuel in seems like it would just saturate the situation even more because the cold air can't hold as much vapour anyways. However, I think my AFRs are leaner until the car warms up.

The problem I am having right now is that I have ran and ran the AUTOVE and each time I start the car it runs very lean but eventually goes to acceptable levels.

[joecar]

Attached is my note taking while reading thru this [long] thread.

For COS5 cal/tun files, see here: showpost.php?p=50208&postcount=218

Edit: the files are already included in the later builds of EFILive software, do not copy them from that link.

[vetteboy2k]

Can COS5 be used to add timing when PCM pin #56 is grounded instead of pulling timing for the Nitrous?

Id like to add timing when the pin is grounded for my methanol system and then go back to normal spark timing without the meth.

[vetteboy2k]

Looks as though minimum advance is 0 and upper limit is 20. Description say the value is subtracted from the final spark value.

Would it be possible to get a COS6 and just modify the timing to allow positive timing instead of subtracted timing?