Baro breakout harness, but baro still climbing at WOT?

[GrannySShifting]

First one we got was doing crazy things with both map and baro plugged in, unplug one other would read fine. This seemed to be A ok, but just now noticing the baro creeping up under boost?

[GHuggins]

From what I've seen with a lot of car chassi's the baro will still compare to the map sensor and "correct" itself. Sometimes you can raise the baro self check settings up above the difference you're expecting to see from map and it'll stop, other times it still does it.

[04silverado6.0]

The one lt1 car i had did not have that issue. Using dmax sensor in the intake and stock map for baro. What cars are having this issue exactly?

[04silverado6.0]

From what I've seen with a lot of car chassi's the baro will still compare to the map sensor and "correct" itself. Sometimes you can raise the baro self check settings up above the difference you're expecting to see from map and it'll stop, other times it still does it.

Are you talking about the map estimation or a different table im not seeing? Is it not correct to raise map estimation?

[GHuggins]

Baro has 2 settings in the diag section on its own although they are primarily for "diag". Map estimation should be raised just above max being seen at the rpm points too. Certain cars have this problem while others don't. Has to be a "buffer" setting or something we can't see just like the sciap update settings that nobody knows about. I set that baro setting to something like 200 and 225 instead of the 20 and 15 settings that are stock. The lt1 camaro's are what I always see this problem happening on, so something with them...

[smokeshow]

It is TIAP, not baro. So intake restriction is still factored into the ambient air pressure estimation. The more air it flows, the greater it will calculate the intake losses to be and add to the baro estimate.

[GHuggins]

Is there a setting to cap it or change the estimation?

[smokeshow]

Yeah, either disabling wot baro updates and using part throttle only or adjusting the intake restriction model to be more representative. In both cases, it'll require digging the cals out.

[GHuggins]

OK. I was hoping there was a way to disable wot updates I would think that would be better than fuel getting skewed from a 90 baro to a 105 under the right circumstances. Thank You

[04silverado6.0]

That would ruin a good dyno day. Can we add these parameters into the newest beta? I have had success getting p59 parameters added.

[GrannySShifting]

It is TIAP, not baro. So intake restriction is still factored into the ambient air pressure estimation. The more air it flows, the greater it will calculate the intake losses to be and add to the baro estimate.

Ummm wasnt that why we started putting baro breakout harness on these things in the first place, so it just measured the dang baro and didnt fudge it all up? Is htere a way to stop baro updates from happening at WOT? No one is flooring their car at the bottom of Pikes Peak and never lifting until the top



GHuggins - why not max those two baro tables out if they are affecting stuff we dont want?

[smokeshow]

No, its now complicated with another layer of models. Wait, you didn't want this on hard mode?

[GHuggins]

On a side note Will found some tables that I'm thinking are more related to expected SCIAP settings or pressure drop settings for a PD blower LT4 car as he said once activated and populated into a once NA cal makes a PD boosted car running a SCIAP have incredibly smooth and controllable throttle behavior. Only problem is like everything else we can only guess since we don't have the DLL's. Are these something like one would be looking for in the TIAP area of the cal? The tables themselves remind me of the 3 baro tables that are part of the torque models for tb airflow in the gen 4's only none of the units correlate. Guess they could just be for running a separate baro altogether like the factory PD blower cars do too?

[smokeshow]

Its like putting together a puzzle. Only you didn't want to.

[GrannySShifting]

So, do you have recommendation on how to get it to work 100% normal? or naw? I have a 2015 Stingray here doing it too and I SWEAR other ones ive messed with baro breakout harness baro stayed at 101 kPa and there was no wierd stuff

Its like putting together a puzzle. Only you didn't want to.

Im not finding the intake restriction model to 0 out so it realizes its a sensor hanging in the air anywhere in HPT


edit: all that to find out I had hit the up arrow 1 time too few and didnt have it set to NA-MAP it was on NA-TIAP I think. I guess on NA TIAP it calcs some intake restriction affecting baro reading based off a table we cant see, vs NA MAP it doesnt bother

[GrannySShifting]

SO bump this car, I originally didnt realize i had switched it back to NA-TIAP on a reflash somewhere along the line and thats why baro was creeping. Set it to NA-MAP and on startup baro read 101 normal and at WOT and didnt look at it again. After a pull I noticed the baro at 90 which is funky, then looking through the log it was 101 and then all the sudden went to 90 while idling??

Setup like this with baro difference allowed settings turned up, Max estimated MAP set to something reasonable, it worked on a couple pulls, but something all the sudden changed how its reads it? 16 seconds in on run54 you see baro jump from 101 to 90. Previous log run 51 baro worked normal though

[GHuggins]

Setting to NA-Map can cause other problems too. At least on trucks, which is probably 90% of my gen V business, it can cause them to get very jumpy or have other weird throttle calc issues. At least with past experience with it.

I will say it made a HUGE difference in changing the baro tables in ones running a sciap, so those posted above are definitely for a sciap equipped vehicle. I put the zr1 2650 baro settings into a zl1 with a 2650 upgrade that was having some dual clutch grabbing throttle jumping issues and EVERY bit of that went away and the throttle smoothed right up. Pretty impressed with how correcting these tables even for a different blower changed things. It also explains why just changing one to be equipped with a sciap doesn't necessarily fix anything and seems to put them into some sort of rep state requiring a lot of dd reworking among other things.

Granny, your airflow resistance models are still playing into things on that one, it's just because you changed it over to map only that it's calculating backwards from the sounds of it.

Now if someone could find those other baro tables for the tiap model, I think we might be set?