COS help?

[yzriders182]

I'm just finishing a twin turbo silverado build and am now doing my research on tuning this thing. I'm looking at using a COS system ether 3 or 5. I have read the tutorial about COS3 and it seems like it will meet my needs. Any benefits to running COS5?

When I start tuning this (hasn't been started since mods) should I start with the MAF on on the stock tune then go to a COS and start the SD tuning or just go COS right away and with or without the MAF. I don't plan on running one once the tuning is done.

Mods: 60# injectors, cam, 2bar map sensor, and twin turbos.

Any starting help is appreciated as I'm new to EFIlive

[ScarabEpic22]

First off, what year Silverado?

If its a boosted truck, flash a COS in to start and STAY OUT OF BOOST until you get the Main VE table dialed in. How much boost? You're going to run out of MAF unless you're using a LS3/7 blade style in a larger tube.

[yzriders182]

Its a 2003.

It is boosted i plan on running 8-10psi. Maybe down the road bump it up to 12psi but that wouldn't be for a while. I know im probaly going to run out of MAF so I do want to go speed density right away.

How do I compensate for the larger injectors? Do I need to make changes to the injector tables before i start it for the first time or do I start it, log then make the changes?

Thanks

[ScarabEpic22]

Well that makes it easy, COS3 is your only option. COS5 is only for 512kb PCMs, you have a 1MB PCM.

With the new MAF sensors, you can scale them so you actually WONT run out of MAF, even at 12psi. The days of being forced to go SD are over. :D

You need to get ALL of the injector data from the manufacture so you can accurately update the IFR, small pulse adder, voltage offset, etc tables. Without the correct injector data, you WILL chase your tail forever.

[yzriders182]

Ok is there a write up or tutorial on how to do that on here somewhere? (update the IFR, small ulse adder, voltage offset, and etc tables)

Any reason I shouldn't go SD and stick with a MAF?

Here are the injectors I put in it.
http://www.bmotorsports.com/shop/product_info.php/products_id/448

[yzriders182]

Any reason I would not want to go SD and keep the MAF?

Where can I get that information form the manufacture? call them or online some where?
These are the injectors I have. http://www.bmotorsports.com/shop/product_info.php/products_id/448

Any links or tutorials that spell out how to make injector adjustments?

Thanks for all the help.

[joecar]

To scale injectors:
- first, measure rail pressure (taking into account FPR reference);
- calculate unscaled IFR for measured rail pressure, and populate IFR table;
- pick a factor (say 0.75 or 0.50) and multiply IFR, VE, MAF by this factor;
- look at all tables that reference airmass, and shift the table such that the airmass axis is scaled by the same factor;
- and so on.

[johnv]

Just go Mafless and get a 2 bar MAP sensor, you will need to calibrate the 2 bar sensor, and change you injector tables to suit the bigger injectors before attempting to start the engine.

[yzriders182]

I have a gm 2 bar map sensor so I need to adjust it to 190 right?

Sorry for the newb questions but were do I get the .75 or .50 from?

I need to pull my tutorials and books back out and go over some things before I ask to many more questions lol.

[yzriders182]

Ok I have all the proper injector data, cos3 installed and bugs worked out.

Im now trying to tune it and starting at idle. My wideband 02 is reading that at idle it is running lean (jumping between 15-17 afr) would I use table B3647 to make this adjustment? shouldn't it adjust automatically if it is set to 14.68?

Thanks for the help. Here is a pic of my B3647 table.

15027

[yzriders182]

15028 This is my current tune too.

Thanks for any help!!!

[joecar]

Ok I have all the proper injector data, cos3 installed and bugs worked out.

Im now trying to tune it and starting at idle. My wideband 02 is reading that at idle it is running lean (jumping between 15-17 afr) would I use table B3647 to make this adjustment? shouldn't it adjust automatically if it is set to 14.68?

Thanks for the help. Here is a pic of my B3647 table.

If you're running SD (MAF is failed with MAF DTC present): correct the VE table.

If you're running MAF (VE is disabled from B0120 set to 400 or less): correct the MAF table.


Do not set the high MAP columns of B3647 to stoich unless PE enables (and PE is set suitably rich)... at significant load you want to be suitably rich to avoid engine damage.

[joecar]

Would you be willing to set your tunetool fueling units to EQR or Lambda rather than AFR...?

Would you be willing to use GM.EQIVRATIO and wideband Lambda for correcting the VE/MAF tables...?

Do you have FlashScan V1 or V2...?

Which wideband do you have...?

[joecar]

In your tune file, fix these out-of-range values:
A0001
A0002
A0012
A0013

To fix OOR: set those cells to max-1, save file, exit tunetool, start tunetool, enter max in those cells, save file (note this is important).

[joecar]

In your tune file, B3647/B3649 are dangerously lean in the high MAP columns...

it seems your tunetool has fueling units set to Lambda... go Edit->Properties and set fueling units to EQR, restart tunetool, and fix B3647/B3649.

[joecar]

Your IFR is set to 71.65 g/s... wrong units...

go Edit->Configure Display Units, find B4001, set the Data units to Imperial (lb/hr), exit, restart tunetool, fix B4001.

[joecar]

Check B0701, B0504, B1301... if you don't have those systems then disable them.

[joecar]

Set PE Enable B3616 to same as 2002 Camaro (65% below 3200 rpm, 35% above 3200 rpm).

[joecar]

BTW: shift points are easier to figure out if you set D0960,1,2 to 100% everywhere.

[joecar]

BTW:

WOT upshift and downshift MPH values are too close (and make sure to keep each upshift above its corresponding downshift).

Set shift times to 0.3 seconds.

[yzriders182]

Would you be willing to set your tunetool fueling units to EQR or Lambda rather than AFR...?

Would you be willing to use GM.EQIVRATIO and wideband Lambda for correcting the VE/MAF tables...?

Do you have FlashScan V1 or V2...?

Which wideband do you have...?

It is a SD tune 2 bar the MAF has been removed and replaced with a IAT sensor.

Yes I would be willing to just curious to the reasoning of why. I set it to AFR because thats what my wideband reads and is easiest for me to comprehend.

I could learn to correct the ve table using lambda.

I have a V2

I have a AEM wideband http://www.aemelectronics.com/wideband-air-fuel-systems-15/digital-wideband-air-fuel-gauge-25/
and also a innovate LM-1 (The innovate is not set up to log with EFIlive yet just the AEM is)

[yzriders182]

Your IFR is set to 71.65 g/s... wrong units...

go Edit->Configure Display Units, find B4001, set the Data units to Imperial (lb/hr), exit, restart tunetool, fix B4001.

I can only change it to lb/min how can I change it to lb/hr?

[yzriders182]

Set PE Enable B3616 to same as 2002 Camaro (65% below 3200 rpm, 35% above 3200 rpm).

Fixed it


Check B0701, B0504, B1301... if you don't have those systems then disable them.

They appear to be disabled to me already.


BTW: shift points are easier to figure out if you set D0960,1,2 to 100% everywhere.

Changed


BTW:

WOT upshift and downshift MPH values are too close (and make sure to keep each upshift above its corresponding downshift).

Set shift times to 0.3 seconds.

Change all shift times (1-2, 2-3, 3-4) to say .3 in all areas? Where do i find the MPH values?

Thanks for the education!!! :)

[joecar]

I can only change it to lb/min how can I change it to lb/hr?Then also do this first:

go Edit-Properties and change the flowarate units to lb/hr... then goto Edit->Configure Display Properties and set B4001 to Imperial.

[joecar]

Did you find the WOT MPH upshift/downshift parameters...?

[yzriders182]

Ok got it changed over to lb/hr.

I did find the shift tables but I am not understanding what I should do with those tables. Just to update this is my current tune file 15091

Again thanks for the help.

[joecar]

For example, the WOT 2->1 downshift MPH should be at least 5 mph (or more) below the WOT 1->2 upshift MPH.

Ditto for WOT 3->2/2->3 and WOT 4->3/3->4.

Yours are too close (or maybe overlapping... I don't remember what I saw the other day).

[yzriders182]

Got ya I'll work on that. Thanks

[yzriders182]

For my 3-4 up shift 50% throttle and up is set to max. Does that seem right?

[joecar]

For my 3-4 up shift 50% throttle and up is set to max. Does that seem right?Since vehicle can't reach that speed, then it inhibits the 3->4 upshift from 50% and up.

Post a screenshot.

[yzriders182]

15101

That's what I figured just didn't know if that was normal or not. Kind of figured its not.

[joecar]

The Performance and Hot curves inhibit the 3->4 for TP at 50% and up...

( Performance = Tow/Haul switch position, Hot = overheating mode )

but the Normal and Cruise curves allow this shift.

[yzriders182]

I see now. Thanks!

[tdmkr496]

I am in the same boat, this thread has been a wealth of knowledge. I'm building a 5.3 turbo Mustang with a 75mm turbo and a PSI harness.