the main point it working

 

ok, question here that might make adding the psi to the BDEpsi table a breeze.

in evo scan the formula for the OMNI3 barmap sensor is:

(0.1789*x + 0.1610)- (your local atmospheric pressure)

So now as I see it if you leave the "your local atmospheric pressure" out the equation it will log absolute (Psia)?

so once you have your baseline WGDC dialed in you could replace the "your local atmospheric pressure" with your boost adder number.

then when you log, the numbers coming up in the log will be the numbers needed to input into your BDE Psi table, no more calculating?

am I seeing right or not (I havent tried it yet)

Mike

 

flat boost curve in every gear now But I didnt use and error correction from -0.5psi to 0.9psi. My gm 3port bsc without any resistor very sensitive for 0.5% wgdc change.

 

We have done zero testing of any solenoid on H8-based ECUs. That page you linked to calls out having blown the drivers only on the 1990-1997 ECUs. Those are not H8-based ECUs.

Given how different all the electronics are on the 98-99 H8 PCB and, of course, all the EVO8/9s, I suspect different behavior with those. They may be (and probably are) much more tolerant of the GM BCS than the 1990-1997 MH6x11-based ECUs were.

And, yes, I did confirm that the GM BCS will blow the driver in the MH6x11 ECUs more than once, with and without series resistors.

Thomas Dorris
ECMTuning, Inc.

 

Just after confirmation about how the BDE tables are used please.

If the Boost Error Correction tables are zeroed out, does that mean the ECU will ignore the BDE tables altogether and just work off the Base Wastegate Duty for the boost curve?

Reason I ask is that my ECU is set to load based boost control with the EC tables zeroed out. The numbers in my BDEL table are nowhere near the load they should be compared to the boost I am seeing (27psi).

My boost curve is fine, I'm just trying to set the BDE tables up so they make sense based on my target boost, or at least know I can ignore them

 

If the Boost Error Correction table is zero'd out, the ECU will only follow your Base Wastegate Duty tables. The only other table that should be active would be the 'MAF IAT WGDC Correction' table. You can datalog the LOAD ERROR with Evoscan while the Boost Error Correction is zero'd out to help you adjust your Boost Desired Engine Load tables.

-Jamie
A.k.A. jack of trades

 

Thanks very much Jamie, very helpful

So is there any real difference between load or psi targeted boost control in terms of setting it up? What I mean is there's no reason why I can't set the 'Boost Desired Engine PSI' table and configure the BEC table, even though I'm using load based boost control?

 

If you don't have a JDM or aftermerket Map Sensor installed and configured to use the 'PSI based boost control', you have to use the LOAD tables. Personally, I prefer load-based boost control since I tune the vehicle for a load curve anyhow. I tune for air 'volume', not air 'pressure'. If you notice, setting the boost PSI the exact same in every gear will give you varying load curves. I prefer to tune one load curve and adjust the boost in each gear to follow that path as closely as I can. Everyone has their own preferences though and none are really right or wrong, just different.

-Jamie
A.k.A. jack of trades

 

Thanks again Jamie. I do have an Omni 4 bar map sensor installed, but the ECU has been setup for load based boost control by my tuner - probably for the same reason's you mentioned.

Now I understand it better I can make tweaks if I need to. The psi tables just make a bit more sense to me when I'm targeting a given boost/rpm, so it's good to know I can use either

 

Can anyone confirm that the re-release of V7 94170715 works with direct psi based boost control? As far as I can tell it is not working. When I enable error correction it just pulls duty cycle even if I am targeting 40psi absolute between adder and target with more or less on one or the other not making a difference..Mabye I am missing something here but seemed to work fine on 965rom after changing scalings for omni4bar. Has anyone tried this rom?

 

check out the scaling in your boost desired engine psi table lets choose the psia8 omi4bar map instead of the psia8 omni4bar map -adj For me it wast the problem with the 9653 !

 

Wow I didn't catch that one, I am indeed running the "-adj" scaling, I will try changing it and see if it helps..A fresh set of eyes is always welcome in my book haha. Thanks

 

I have a PLX 3 bar and not a jdm 3bar. i know the value for the plx is 2*Voltage+10. can i use the jdm 3bar patch? i would assume i would have to change the values somewhere because they shouldnt be the same.. any clue what i would enter into my xml.??

 

what would need to e done to move the basline wgdc table into the new section that the xml from the the first page of this thread adds?

kinda weird to set the boost curve in one section, and the wgdc in another.

also, is it normal that my entire wgdc table is set to 100 before i even touched it?

 

Are you using ECU-based boost control or are you using an MBC? If it's ECU then no, your WGDC shouldn't be 100% all the time. It should fluctuate in similar manner to the boost curve.