rolly1818

patiently waiting

ziad

iTrader: (1)

ok seeing this looks like the post to put the question i will ask here. ok first the basics. I have a jdm 8MR running a 3 port boost solenoid. since we have two solenoids i connected the 3port to the black one... which corresponds to the 2nd BWDC tables in ecuflash. 2ndly i am using the livemap version of Tephra 510 rom. i have the TBEC turned off. the load i am logging is the temp compensted 2 byte load.

ok the question are
1) looks like the WGDC Mut 86 only shows the dutycycle from table 1 of BWDC... even though i am running off table 2. is there a way to log table 2 instead of table 1.

2) all the threads i have read which talk about bdel say that it tapers off higher rpm... but during logs it looks like i can run 159 (159+110=270) all the way down and achieve 25PSI boost is that correct?

MR Turco

iTrader: (16)

What are your mods and have you done a boost leak test? One thing about using load as a target is you could have boost leaks which would cause much higher load than what you should be getting.

It's not so much that load drops off, even though it does, it is more you want it to drop off as you are outside the turbo's efficiency and are creating a lot of heat which could lead to high EGTs or detonation. Things like o2 dump, less restrictive exhaust and ported head components will allow for more boost up top.

The recommendations for the TBEC should be to turn off upward correction when tuning. Having downward correction is almost MORE important during tuning that when the car is tuned.

ziad

iTrader: (1)

i got a bbklite, ported manifold and 3" exhaust. there isint much knock really. no i havent done a boost test

MR Turco

iTrader: (16)

you should, i had one local i did a boost leak test had his load drop from 280 to 240-250 at the same boost after fixing a few big boost leaks. Most common problems i have found is TB seals (known issue - and i have seen this be an issue on evos as low as 20k miles) and people using the wrong size boost/vacuum lines.

shadow1

iTrader: (38)

Every Evo I have pressure tested has had leaks. Most with multiple leaks. All leaked at the TB shaft seals (if they were still had stock seals). Even a new (back in 2007) IX with 17k miles had leaking TB seals.

shadow1

iTrader: (38)

What WGDC correction intervals are people running? I know mrfred recommends 1 but I have an Ingersoll 3-port solenoid that is very sensitive to error correction. I want to raise my interval to stabilize the up/down WGDC% changes. Just wondering if anyone else has tried a longer interval.

Monochrome

iTrader: (9)

Maybe it's been asked and I just can't find it in my research, but will V7 support direct boost control with the alt maps or are you only sticking with the gear based load control?

mrfred

iTrader: (50)

For a solenoid like the Ingersoll Rand that probably has huge flow, I recommend keeping the interval at "1", and tweaking the feed back (error correction) table to smaller correction values.

shadow1

iTrader: (38)

I already have small correction values (my highest correction -3% for +3.1 psi). I saw that some people are using correction intervals of 2 or 3 for the GM 3 port. So I figure the Ingersoll might benefit from a higher interval as well.

MR Turco

iTrader: (16)

yes it will support it. And it will have alt maps for boost control.

mrfred

iTrader: (50)

The key here is not to change the psi range, but to use smaller WGDC correction values (right side of the table) over that psi range.

shadow1

iTrader: (38)

Exactly. That's what I did.
-3.0888 0
-2.7027 0
-2.3166 0
-1.9305 0
-1.5444 +1.0
-1.1583 +0.5
-0.772201 0
-0.3861 0
0 0
0.3861 0
0.772201 0
1.1583 -0.5
1.5444 -1.0
1.9305 -1.5
2.3166 -2.0
2.7027 -2.5
3.06467 -3.0

With an interval of 1, my boost is pretty good but I still get some oscillation between 23-25 psi (desired is 24.1). My boost curves are actually the best when I zero out my BEC. But I prefer to have some closed loop feedback.

MR Turco

iTrader: (16)

can you graph and post the boost oscillation you are talking about? It sounds like your baseline WGDC is off if you are getting that much oscillation.

One thing to try is build in an under and overshoot buffer. What i do is the follow:

...
-1 2
-.9 0
0 0
.9 0
1 -4
...

This essentially gives me a -1 to 1 psi buffer where correction does nothing. I use the correction for extreme variation, so when it is too low or too high. I tune the car enough to change season to season variations anyway.

shadow1

iTrader: (38)

I already do this with my BEC table. I don't start correction until 1.5 psi of error. My base WGDC are great - my car actually has a great boost curve with BEC zero'ed out. I only get oscillation when I "turn on" error correction. Hence my question about the correction interval.