-3.1 psi is the furthest negative the setup can go. +3.1 psi is the max positive value as well. The ECU will use the WGDC correction values at -3.1/+3.1 psi if the boost is outside of these values.

 

Holy crap! Mine is doing the same thing. My boost is all over the place at times. After triple checking all connections, hoses and 3 different BPV's I find this thread! LOL Sucks to be me.

Bnice01 just edited my rom with the ability to use PSI and not load to control my boost (now that JDM map sensor I purchased is going to show its worth). Hopefully we will get it sorted and I'll post up the results.

Thank god for this section and for those that understand this stuff. Its all Latin to me!

 

No worries man we'll get yours fix.

I love ecu boost

 

Just a quick update. My problem has been solved. For some reason at my mod level load based boost control became unstable or erratic to say the least. Once I installed a IX JDM MAP sensor and had the ROM edited by Bnice, all is well. I consistantly hit 21-22psi now (never under) but I do get a random 24 spike. Once Bnice plays with the boost tables I am confident we can get the boost control locked in regardless of the conditions.

All this time I thought it was a boost leak or bad BPV. Turns out the high RPM flutter was the load based boost control! Never again!!!!

 

Good stuff man, not bad for editing it over email with no logs. But I would stop by your house after work today or tomorrow but got to pick up the misses v-day gift, not mention cant miss V-day . Yeah how does friday sound after work?

 

That's interesting, I've used load based boost on cars from stock to 110 octane FPgreens making over 400whp to ones with FP3065's,etc without issues...

One of the big keys in making it work really well is changing the boost load to follow 2byte load.

High rpm "flutter" sounds like the load targets and error correction weren't set correctly.

 

I dunno Bryan. It never was a problem, then it was. Drove me nuts. I remember you asking me about the 2byte load thing when I got the JDM map sensor & GM 3port. Maybe you could PM me a contact number and I'll give you a call when bnice is over. Judging by the help you have given me (remember the map you made for me when I took the Evo to the Nurburgring?) you have this GM 3port ECU based boost control figured out better than anyone.

 

Yo steven he was talking about using 2byte load for logging, since your ecu used load instead of psi for target boost. You use 2byte load as a reference to get your target boost because you didnt have the jdm map sensor @ the time to log boost. I think when mase tuned your boost he was using calculated load. 2byte load is the engine true load, CL is just a calculation.

Now your ecu is direct psi control, and you log boost as a reference to get your target boost. Its setup very similar to the subbie's I tune, I guess subaru has +1 in that section LOL

Just let me know bro when you want to get it dail in.

 

Actually I was talking about switching boost load to normal 2byte load. Normally the boost control follows it's own load path, which is a little different than normal 2byte load. That is what some people don't understand and leads to frustration and wrong load targets in the boost tables.

Using normal 2byte load also makes the boost much more consistant overall in different temps.

 

you have a pm

 

LOL i read into things to hard, thanks for clearing that up.