how-to: ECU-based direct boost control
#241
Methinks we should re-label "baseline boost 1/2/3" to "Boost Target"
Less confusion with Baseline WGD then
Going to give this a red-hot-go tonight new 3port as well, so really I should start with VERY low DC's in the BWGD table.
Less confusion with Baseline WGD then
Going to give this a red-hot-go tonight new 3port as well, so really I should start with VERY low DC's in the BWGD table.
#242
Thread Starter
EvoM Guru
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From: Tri-Cities, WA // Portland, OR
Yeah, I struggled a bit on the terminology. Trouble is that its not really target boost. Baseline boost + boost adder = target boost. That's why I used the baseline boost term. Still not completely happy with the terminology.
#244
#246
#247
Because its direct boost you need to have a MAP sensor to read how much boost you are running. - obviously :P
So if you plan on running more than 28psi (3bar - atmo) you will need to upgrade your map sensor...
Now the other problem is that mrfred's change does something funny which artificially limits you to 24.6 psi (255/(2*5.18) = 24.6psi. I am looking at getting rid of the 2* which means you could run upto 49.2psi using the standard maps.
Anyways once MrFred gets back from Hol's he can take a closer look
So if you plan on running more than 28psi (3bar - atmo) you will need to upgrade your map sensor...
Now the other problem is that mrfred's change does something funny which artificially limits you to 24.6 psi (255/(2*5.18) = 24.6psi. I am looking at getting rid of the 2* which means you could run upto 49.2psi using the standard maps.
Anyways once MrFred gets back from Hol's he can take a closer look
#250
#251
Thread Starter
EvoM Guru
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From: Tri-Cities, WA // Portland, OR
The limit is 24.6 psi + whatever is in the boost adder 1d table. I like the 24.6 psi range in the baseline boost table because the increment in the table value is 0.1 psi. The 49.2 psi range has the advantage of being able to set the boost adder to atm pressure. The increment is 0.2 psi though. Either way its advantages. Both allow 30+ psi tuneability if someone wants to go there.
The JDM 3 bar is linear out to 4.6 V / 30.5 psi. I've measured it.
The JDM 3 bar is linear out to 4.6 V / 30.5 psi. I've measured it.
#252
yeah so as I said:
3 bar = 43.5 psi
atmo = 14.5 psi
3bar - atmo = 29psi (sorry I said 28)
So with a 3bar map you can run upto 29psi, you probably wouldn't want to (as you are at the limits of the MAP sensor) but you could.
edit - hey mrfred what was your elevation when you measured 30psi?
3 bar = 43.5 psi
atmo = 14.5 psi
3bar - atmo = 29psi (sorry I said 28)
So with a 3bar map you can run upto 29psi, you probably wouldn't want to (as you are at the limits of the MAP sensor) but you could.
edit - hey mrfred what was your elevation when you measured 30psi?
#253
Yea that's what I thought.... Could have sworn the JDM sensor was good to 30psi. Just have to changed the boost adder, which is why I said changing the boost adder to "atmospheric" would confuse people that want to run more boost.
here is a 28psi+ log:
here is a 28psi+ log:
#254
Which lead to this confusion.
#255
It might be good to 30psi if you tune @ 2000ft
edit - ^^^ lol, yeah I was confused with your 26psi as well, because the table limits you to 24.6 psi :P
edit2 -- clear up
to run more than 24.6psi (table limit) you either need to remove the 2x scaling modifier, or bump your boost adder
to run more than 29psi you either need to tune at higher altitudes OR get a better map sensor.
I think thats right?
edit - ^^^ lol, yeah I was confused with your 26psi as well, because the table limits you to 24.6 psi :P
edit2 -- clear up
to run more than 24.6psi (table limit) you either need to remove the 2x scaling modifier, or bump your boost adder
to run more than 29psi you either need to tune at higher altitudes OR get a better map sensor.
I think thats right?
Last edited by tephra; Feb 11, 2008 at 09:26 PM.