[sbrach]

Well I guess it's time for a 3.5bar TMAP....

[enemigo13]

why you need this kind of crazy boost at 4000rpm? it will not make you go faster, you will just ruin torque curve. I would understand this if you could keep it up to redline or at least 6000-6500rpm and make great power. now its pointless.

Originally Posted by sbrach

Well I guess it's time for a 3.5bar TMAP....

[BMWcurious]

Bigger turbo needed Agree no point in peak power at 4500 RPM with 7000 RPM red line. I prefer to have a reason to rev a petrol engine, not a reason to change up and have high cylinder pressures. May as well have a 335d.

[sbrach]

This was just a first pass at editing the Commanded WG table. I was a bit aggressive. Currently peaking at 21psi and tapering to 14 at 6k on latest revision but I had a small throttle closure due to overboost so still needs more work. Once this turbo dies it will be time for an upgrade.

[houtan]

Originally Posted by sbrach

This was just a first pass at editing the Commanded WG table. I was a bit aggressive. Currently peaking at 21psi and tapering to 14 at 6k on latest revision but I had a small throttle closure due to overboost so still needs more work. Once this turbo dies it will be time for an upgrade.

Don’t hold your breath on that turbo dying. Mine looked literally brand new after 20k miles of pretty much 100% wgdc. Thing took a beating and liked it haha

[enemigo13]

what are advantages using commanded WGDC? you will not get boost target without it as WG will not go high enough?

[sbrach]

It's much easier to understand and tune. The stock boost control is very complex. I'd rather use stock PID boost control though because Commanded WG is going to need tuning for temp/elevation changes.

[enemigo13]

you mean WGDC control is complex? principle for this ecu is good, its torque based, you set your all tables in Nm you want, just in this thread everybody max out torque tables (sets all of them to 900Nm) and its running solely on RF limiter which is set to 190% well, maybe it's also way of tuning, but I set to more reasonable numbers and of course limit torque at lower rpms (dont need 190% RF at 2500-3000rpm for sure, 160% is enough, want to have gearbox alive). so, raising compressor power (kw) map helps wgdc to have initial higher wgdc position? Because in my case it sits at around 60% and after desired and actual differs too much WGDC kicks in and gives some short 80%, which of course brings boost near to desired. Don't think its normal, any comments? ordinary N55 and N55 mppk has this map the unchanged, while M2 has higher numbers.

Originally Posted by sbrach

It's much easier to understand and tune. The stock boost control is very complex. I'd rather use stock PID boost control though because Commanded WG is going to need tuning for temp/elevation changes.

[sbrach]

No I mean stock boost control is complex.

Commanded WG just increase all limiters and load request, log boost setpoint and WGDC, look where you are under/over boost target, go to that RPM/Setpoint cell and adjust. It's still load targeting just without the PID control of WG to hit requested Boost. The issue is that you are setting a fixed WGDC for each RPM/Boost request point and when external factors such as the weather change so do the required WGDC values.

[enemigo13]

seems complicated and not easy to calibrate that car would go like stock on part throttle? still did not get answer from anyone why stock boost control is bad? it does not let achieve load targets, or its wgdc % is not enough to reach load targets?

Originally Posted by sbrach

No I mean stock boost control is complex.

Commanded WG just increase all limiters and load request, log boost setpoint and WGDC, look where you are under/over boost target, go to that RPM/Setpoint cell and adjust. It's still load targeting just without the PID control of WG to hit requested Boost. The issue is that you are setting a fixed WGDC for each RPM/Boost request point and when external factors such as the weather change so do the required WGDC values.

[BMWcurious]

Anyone played with the Fuel Start AT (VVT) and Fuel Start MT (VVT) for cold start on ethanol mixes? In the latest repo xdf they are duplicated, but same addresses, and I suspect the(Throttled) versions only are used if valvetronic isn't working, although I did wonder if valvetronic would work if it was very cold. There are other afterstart tables, but hoping just these are necessary.

[sbrach]

Originally Posted by enemigo13

seems complicated and not easy to calibrate that car would go like stock on part throttle? still did not get answer from anyone why stock boost control is bad? it does not let achieve load targets, or its wgdc % is not enough to reach load targets?

I just haven't tried using the stock control strategy to increase boost yet. I agree the stock control strategy is better than Commanded WG for a number of reasons and would like to get there. It is more complicated as you need to tune the compressor characteristic map as well as the PID tables. Commanded WG you just increase load request which increases boost setpoint and boost target. Then just increase WGDC at each RPM/boost setpoint until boost is close to boost target. Commanded WG is still targeting load, you just replace the P and the D table with the Commanded WG table which, for me, is easier to understand.

Originally Posted by BMWcurious

Anyone played with the Fuel Start AT (VVT) and Fuel Start MT (VVT) for cold start on ethanol mixes? In the latest repo xdf they are duplicated, but same addresses, and I suspect the(Throttled) versions only are used if valvetronic isn't working, although I did wonder if valvetronic would work if it was very cold. There are other afterstart tables, but hoping just these are necessary.

I have not. I am using MHD so I just click the checkbox.

[BMWcurious]

Originally Posted by sbrach

I have not. I am using MHD so I just click the checkbox.

Which checkbox and what does it do? Heard people talking about various start related stuff with side effects?

Writing the new xdf tables now, but haven't used the app in a car yet.

[sbrach]

There is a flash time option for "Cold Start Noise Reduction", it works great for me but I do not know what tables it changes.

[enemigo13]

stock and mppk uses the same KF_ATL_PVERD, and nothing of WG tables is changed. M2 uses different KF_ATL_PVERD and maxxed out
KL_ATLR_MX, so probably I will try to use it and see what happens.

Originally Posted by sbrach

I just haven't tried using the stock control strategy to increase boost yet. I agree the stock control strategy is better than Commanded WG for a number of reasons and would like to get there. It is more complicated as you need to tune the compressor characteristic map as well as the PID tables. Commanded WG you just increase load request which increases boost setpoint and boost target. Then just increase WGDC at each RPM/boost setpoint until boost is close to boost target. Commanded WG is still targeting load, you just replace the P and the D table with the Commanded WG table which, for me, is easier to understand.

[sbrach]

So this week I mixed E40, turned out to be a mistake. Ran out of fuel anwhere close to WOT. Turned down boost/increased AFR - got a couple pulls where it ripped but most would still break up post shift or at high load.

Back to E30.

My one big hang up so far has been the fuel scalar table. My STFTs are still very negative. I keep reducing the table but, for example, at 4700rpm and 170 load my STFT is -14%. The scalar table at that point is 1.10. Does it really need to be .96? on E30? That doesn't make sense to me when the stock table is 1.0 at that point.

https://datazap.me/u/sbrach/rev24-e3...5-17-34&solo=4

[enemigo13]

anyone can explain why single gear pull is ok no matter what gear is but after gearshift ECU is asking for less boost (and getting less also)?

[sbrach]

Originally Posted by enemigo13

anyone can explain why single gear pull is ok no matter what gear is but after gearshift ECU is asking for less boost (and getting less also)?

Can you post a log?

[enemigo13]

Originally Posted by sbrach

Can you post a log?

https://datazap.me/u/enemigo/f30-335...olo=2-3-6-8-12

[sbrach]

Originally Posted by enemigo13

https://datazap.me/u/enemigo/f30-335...olo=2-3-6-8-12

Ladedruck is boost, correct?

Looks like a pretty bad boost oscillation. Did you modify the compressor characteristic table? I've not experimented with the stock boost control strategy yet but I believe the approach is; zero out adders, tune the compressor characteristic table to get boost close to target, then make small PID adjustments to control over/under shoots and the resulting oscillations.

[enemigo13]

yes compressor characteristic table is taken from M2, but it seems its a bit too much. with stock compressor map I cannot reach targets and if actual from desired differs too much it gives some 80% wgdc bursts to stabilize boost... will try X4 M40i turbo characteristics map as its a bit higher than F30 335i but much lower than M2, also will set 10% targets at 5000-6500 rpm..

Originally Posted by sbrach

Ladedruck is boost, correct?

Looks like a pretty bad boost oscillation. Did you modify the compressor characteristic table? I've not experimented with the stock boost control strategy yet but I believe the approach is; zero out adders, tune the compressor characteristic table to get boost close to target, then make small PID adjustments to control over/under shoots and the resulting oscillations.

[enemigo13]

if boost is not dropping but rising during gearshifts this means that dump valve is defective?