Boost Control via Factory ECU

[Hotwire]

Has anyone given boost control via the factory solenoid/ecu a go? The addresses as defined by the Russians appear to be correct given the boost curve observed on a number of stock cars at a recent dyno day held here in South Australia.

So i guess I wanted to know has anyone attempted to change the boost via stock solenoid here on CVR4, or am I likely to be a "pioneer" if I give it a try?

[Adam.Findlay]

i have just removed my boost controller and plumed in the factory solenoid for this exact purpose. i need to borow the open port cable and figure out what tables to alter but i will let you know if i acheive anything and would be great if you could do the same?

[Shtiv]

Seems like everyone wants to know. all going to plan I am replumbing my factory solenoid in this weekend to confirm it all so I'll post the results on here also as well as ozvr4

[Hotwire]

Following on from the posts in the xml creation thread:

Thanks to Michael (justcruzn) @ OZVR4 I put the factory restricted hose in the boost control circuit this avo, and Success! Back to factory boost map.
So, in summary here is the stock boost curve for a WOT run (including 2-3 gear change):


and here is just manifold presure for just the 2nd gear component:


And here is the WGDC's from my ROM:


as you can see there is very close correlation, but its not clearly C or D.
So I logged all my general driving then did an XY scatter of all points, and you can clearly see the trend of the two WGDC maps:


Conclusion?
Time to make some changes to target boost and WGDC and see the results
I'm pretty happy with the results thus far.

[Hotwire]

Just compiled a few logs together and got the following result:

It seems there is some compensation factor going on here, or interpollation with the A & B duty cycle maps (all 0s) as below 2000rpm, the WGDC is lower than the 100% required by both C & D maps....

[Nutter_John]

Your getting close Lee to finding the method they use for controlling boost via the stock soleniod , table C looks wrong to me though

[Hotwire]

John,
Do you have any insights into the boost control you can share? I agree that with C being different to D doesnt seem right, as its not quite the curve that i've logged also. Any idea what the correction may be attributed to and the address it may be found at?
Thanks
Lee

[Nutter_John]

keep going in the direct you are going Lee things will start to slot into place

[Subaru ETA]

I think Kenneth was playing around with this a while ago....

[Nutter_John]

Ok after loooooong chats with Afro here comes the info you need !!

WGDC-C is not what you think it is , it is in fact the TARGET Boost for cold engines
WGDC-D is not what you think it is , it is in fact the TARGET Boost for at operating tempreture

Boost Desired engine load C = gain - duty cycle - Hi Octane Auto
Boost Desired engine load D = gain - duty cycle - Hi Octane manual

all values are load8

If you blow up your engines by alter any of these values don't come moaning to me !!!

[kinkyafro]

Enjoy

[Hotwire]

Thanks guys, you're absolute champions

[Shtiv]

Yeah that makes sense, I thought the D values looked to be the right thing.... and they seemed to work and yeah BDEL being gain - WGDC makes sense, a few preliminary observations here:

http://ozvr4.com/forums/showthread.p...-boost-control)

[Hotwire]

Ok had a rather random result today.
Auto & manual tables for gain duty cycle set to the same target, target boost for operating temp altered (but not cold spec).
Logged 2 WOT runs to see how boost came on, and these are the results:

as you can see, on one run I only hit 3/4 of the WGDC, and only a boost of 10psi, not 13 as with 100% WGDC graph.
The car was warm for both runs (sitting around the mid-high 80ºc mark) so I'm stumped. what other factors are involved here.....

[Nutter_John]

Lee can you post up the expanded views of all four tables (target boost hot and cold , gain man , gain auto )

[Hotwire]

Here ya go John. I also logged coolant temp this avo, and seems that the temp is going down to around 79-80ºc too, which makes me wonder if its interpollating with the cold table? Seems that way from the graph as WGDC definitely drops when temp gets down that low.
Would be interested to hear your thoughts.
Lee

[Nutter_John]

Yep you got in one the temp needs to be above mid 80's to be fully on the hot map

it took us at least 20+ dyno pulls to work out what was going on with the temp as we would do a run and check then another and it would be different to the first one

[Hotwire]

Intersting - I always wondered about my car running "too" cool. I'm then guessing there is countless other maps then that would be affected by running in this temperature region? I see for the fuelling for example, at 79-80 I'd be getting 6% enrichment, do you know of any others?

Seems like I either need to adjust this (can with fuel, but not sure how/where to adjust boost compensation) or get a "warmer" thermostat.....

[bradc]

What is supposed to be the 'ideal' temp range then?

[Patryn999]

Not sure, but thought the thermostat only opened at 82 degrees? Ideal operating should be just above that. Any idea why your car runs so cold Lee? maybe it does run right and the thermostat is knackered. Otherwise if you're legit running it at the temperature it is currently then it'd just require a series or parallel resistor to shift the curve and lie.

Went to check the validity of this idea (given that thermal sensor is probably non-linear) and appropriate values but couldn't get into the workshop manuals for some reason.


Also the 82 degrees was pulled out of my butt. Its what the thermostat's on the corolla's are, but they're not exactly turbo'd performance vehicles.