Throttle VE

[oztracktuning]

How do we use the new Throttle VE tables in the E38 operating system. Has anyone had a go with this feature.

[ringram]

Im guessing tuning them is the easy part, usual autove type approach with a different map, however enabling it is a good question.
Im sure Ross can explain

[JezzaB]

Waiting for you to try it first Steve

Havent had an E38 with a cam yet to have a crack at it. Was talking about it the other day and came up with a few ideas to try with it but nothing in stone.

But are the VE figures in LS2 (8192 max) type figures or the VVE style?


Jez

[oztracktuning]

Its looks like its already activated. But the table has all zeros. Its not clear what is needed to be done to get it going. I would want to use it just at zeo % throttle to start with just to smooth idle out.

[ntae]

i spent a few hours on it & had no luck

but in saying that i can't work out how to map the min air flow table

[ringram]

Min idle airflow table doesnt seem to work for static idle. See my other post re idle speeds. I dropped it into the ground, no change. The desired idle speed also only seems to work at rolling idle when over the 6kmph trigger.

I think some more work on the .calz files is in order

[GMPX]

Yes, even with 500+ calibrations there is still more to discover for these ECM's, The throttle VE's 'should' be active I agree, they are actually meant to be used when the cams are moving, obviously on many engine that will never happen, maybe a patch is in order to force them. But, as yet there has not really been the need for them.

Cheers,
Ross

[hymey]

Steve you could try enabling open loop, then use B0143 to command a richer idle. B0143 is only activated clutch in or neutral so it allows you to smooth out bigger cams at idle.

[Delco]

Throttle VE works perfectly , finally got around to testing it today Ross , did a log to calculate the VE from the speed density VE table , transfered it all across and it is was tracking within 2 % on the first pass , did some logging with it active and speed density inactive and it responds as expected , logged the ben factors and TPS VE is now spot on after a few passes over each load point on the dyno , recjhecked on the road and all is spot on.

It is active above a TPS setting and above the vcuum setting.

Cant see it being needed as yet as we have been able to get very big cammed combo's to perfectly and drive spot on using the VVE tables.

the E38 is a lot easier to tune with than the older PCM's

[hymey]

It is good to see someone has made progress here, The cammed VEs I have been in have all run very smooth still with closed loop enabled. The VVE table doesnt have the precise adjustment like the older version though to change an individual cell and prevent afrs from oscillating in zone 30 is hard, the VVE appears very smooth to look at but doesn't perform this way especially noticed in higher rpms when switching between cells. The system may allow smoother idle running, but I ask this question. Does the throttle table allow more steady top end afrs. With a lot of hours of road testing(including a 2000km straight log) there is afr swing evident. A customer may not pick it up in his own car that has been dynotuned, but the swing is definately there. The IAT flow table isnt fine enough in adjustment to combat. The VVE can be sorted with a bit of work, but its the WOT swing I am concerned about.