Boost desired engine load & Max waste gate duty

[scandinavian flick]

Thinking of going from my greddy bc to 3 port solenoid running off ecu. Why does the Boost desired engine load & Max waste gate duty have 4 tables each. Do you set them all the same, as they are currently but with your moded setting?

Cheers

Jon

[GrayW]

They are for different operating conditions, you should make them all the same or you risk mega boost if one is left standard.

[scandinavian flick]

So none have to have lower values to switch to then?

Gray with boost limit mines on 319 because of my EBC so if I want to use 1.6bar how does it equate Are the values upset like they are in the fuel table beceuase of mods or is there a simple formula

[AndyF]

I setup a 3 port yesterday on a std E7 so I can pass on a bit of experience ;)

The boost control load offset value is added to the boost desired engine load figures however the boost desired engine load value is capped at 159.4.

Therefore if you're aiming for 1.6 bar then you need to have the boost control load offset set to something around 110.

Now this is all very good for telling the ECU what boost you want it to hit but unless the max wastegate duty cycles are close to the target values it needs then you will get wild fluctuating boost levels so you need to set the wastegate duty cycles to a range of figures and then go and do a run, tweak the figures and repeat until the ECU has the correct settings.

As an example, mine from last night ended up being set at something like the following (however I was peaking at 1.8 and holding 1.5):

500-2750 rpm: 100% to get quick spool
3000-5000rpm: 70% seemed to get it to peak nicely
5000rpm- : 80% to hold around 1.5

I should also add that this was using an Apex'i solenoid so it might be different for yours etc.

Andy

[scandinavian flick]

Andy thanks very much for that... Regarding the plumbing, the electrical side would would plug into the place where the original plug went & the tubes should mimic the factory installation. But just use my greddy 3 port.

Cheers

Jon

[AndyF]

The electrics just plug into the std plug and the plumbing should be an in/out arrangement with the solenoid in the middle.

Andy

[scandinavian flick]

Hi Andy did you adjust the boost error correction.

Cheers

Jon

[AndyF]

Nope, I kept the boost error correction as std as it gives a nice overboost in the lower gears.

Andy