Who runs a COS on a NA setup? Pros/Cons???

[BlackGMC]

I am thinking of switching to a Custom Operating System and I would like to hear about peoples different opinions... A couple of reasons I want to do this. First trying to dial in the MAF is a huge PIA.... Running in Open Loop with PE feels so much better than normal Closed loop MAF... Also I want to command 15.5 in the cruise regions for some better MPG...

[Chevy366]

I am thinking of switching to a Custom Operating System and I would like to hear about peoples different opinions... A couple of reasons I want to do this. First trying to dial in the MAF is a huge PIA.... Running in Open Loop with PE feels so much better than normal Closed loop MAF... Also I want to command 15.5 in the cruise regions for some better MPG...
Started with a OLSD tune to begin with , runs great (over a year now) , but no real gain over a MAF tune .
I run OLSD with out PE use the [B3647] for PE , [A0014] and [A0008] can be tricky to set up .

Try it nothing to lose , and quite easy to do .
I am sure dc_justin will set you straight .

[BlackGMC]

I run OLSD with out PE use the [B3647] for PE , [A0014] and [A0008] can be tricky to set up .


I don't have those 3 tables in my stock tune.... Are those added when you upgrade to a COS?

[BlackGMC]

Oh and do you need to adjust your tune for the various seasons? Like summer and winter? Here in texas summer can be like 100* then in winter is it like 40*...

[TAQuickness]

I've been running OLSD for about 2 years, and COS5 for about a year of that. The Alpha-N VE found in COS5 was what I needed to acheive a level of drivability that resembles OEM.

[Chevy366]

I don't have those 3 tables in my stock tune.... Are those added when you upgrade to a COS?
Yes .

[Chevy366]

Oh and do you need to adjust your tune for the various seasons? Like summer and winter? Here in texas summer can be like 100* then in winter is it like 40*...
No , runs a shade better during the winter than the summer .
IAT temps better during winter .

[joecar]

I'v been running COS5 in OLSD on my stock '01 TA (headers only)... I don't really need to run a COS or OLSD, but it has been a good educational exercise, and I have gone from 17 MPG to 22 MPG.

It has been shown that SD and MAF produce the same TQ/HP... I don't disagree with that... TQ/HP depend on air, AFR and timing all of which can be made the same in SD or MAF modes.

I have found that throttle response seems to be quicker with SD... i.e. engine responds quicker to throttle transitions (which also seems to make the trans respond in a postive manner).

$0.02

[Chevy366]

I don't really need to run a COS or OLSD, but it has been a good educational exercise, and I have gone from 17 MPG to 22 MPG.

It has been shown that SD and MAF produce the same TQ/HP... I don't disagree with that... TQ/HP depend on air, AFR and timing all of which can be made the same in SD or MAF modes.

I have found that throttle response seems to be quicker with SD... i.e. engine responds quicker to throttle transitions (which also seems to make the trans respond in a postive manner).

$0.02
Very good summation (summarization :nixweiss: ) ! :cheers:

[Biggsy]

I have found that throttle response seems to be quicker with SD... i.e. engine responds quicker to throttle transitions


I agree

[BlackGMC]

Thanks for the input guys, look like COS3 will be in the works!!! I appreciate all the feedback, I am sure I will have some more questions.