Need some help with Calc VET

[joecar]

You want to be safe at high load, so do not disable PE (he said zero out the PE timing adder B5908).

KR is on top of the sliding interpolation between HO and LO.

[joecar]

Attachment 20829Attachment 20830

So now Im Just confused.

So am i wrong for dropping the timing on those cells that have a value other than 0 and blending...

Im open to trying to run your timing tables and see what happens.

Just kind of lost now.

Try adding a little more fuel.

[joecar]

I guess im all alone here now... Ive chased everyone off....

Im still tweaking the table some for spark very happy with the results thus far.... Wondering if a lean cruse isnt possible since ive ditched the EGR. Tempted to put the EGR back on honeslty.... Mileage dropped this last time by 3 mpg.

Sorry, I was out of town.


What is the octane rating of your fuel...?

[HellKnightHicks]

Its 93 I belive... I think i just ran threw alot more fuel tuning..

Where do I add more fuel.

Zeroed - B5908

Redid did my VE and maf Tables after hopping up the timing.. The numbers did increase. Did some smooting to the VE and Spark Tables.

[HellKnightHicks]

Im assuming that the lower the Lambda number is more fuel. Higher Lambda means leaner.

Im only Familiar with AFR Numbers at this point.

Modified the PE Enrichment table for More fuel across the board.

[joecar]

Im assuming that the lower the Lambda number is more fuel. Higher Lambda means leaner.

Im only Familiar with AFR Numbers at this point.

Modified the PE Enrichment table for More fuel across the board.

Yes, lambda < 1.000 is rich, lambda > 1.000 is lean (avoid this).

AFR numbers depend on the fuel you're running.

Take note that NA PE should be about lambda 0.85 (EQR 1.175) or so regardless of fuel being run.


I like to refer to exhaust wideband lambda and ECM commanded EQR to keep the context's separate when speaking (and see below).

( EQR is simply 1/lambda (and vice-versa of course) )


So wideband already produces lambda.

In tunetool, go Edit->Properties and set fueling units to EQR.


The BEN correction is wideaband_lambda x commanded_EQR (this is the easiest form to remember)...
for example, in the calc_pids.txt, CALC.WO2BEN is defined as {EXT.WO2LAM1} * {GM.EQIVRATIO}

[HellKnightHicks]

And thats how we can figure the correction correllation for VE and what not..

Nice good info.

I have B1368 set to .82 like Super's tune at this time...

I have a whipple for this truck and have debated installing a COS as well as switching to a 2 Bar Map sesnsor. Like i did with the other setup I never got finished tuning.

[joecar]

...
I have B1368 set to .82 like Super's tune at this time...
...

B3618

when you refer to its value, look in the upper RH corner of the EFILive tunetool, does it say Lambda or EQ Ratio...?

If the value is 0.82 Lambda then you're almost safe (for SC/TC Lambda 0.78 would be safer).

If the value is 0.82 EQR then you are way too lean (PCM prevents PE commanding less than EQR 1.000).

[Supercharged111]

And thats how we can figure the correction correllation for VE and what not..

Nice good info.

I have B1368 set to .82 like Super's tune at this time...

I have a whipple for this truck and have debated installing a COS as well as switching to a 2 Bar Map sesnsor. Like i did with the other setup I never got finished tuning.

Crap, forgot I jammed in .82 for PE! I thought I had .85-.87 because that's what my wideband tells me when I stomp it. I remember now that I had to cheat on PE to get the right WOT AFR because my lazy ass hasn't done a calc.vet yet. I believe it's because I'm using the Express van base tune which has different MAF plumbing. I keep putting it off until I swap on the marine intake, but I need the dually running again before I break this truck.

[joecar]

NA: safe PE is lambda 0.85 (EQR 1.170).

TC/SC: safe PE is lambda 0.78 (EQR 1.28).

Safe means having sufficient fuel to avoid lean knock.

Also, you have to make sure spark advance is reduced to avoid knock.