ostrich 2.0 with ITB's

[bmwconnect]

Yep, MS would be the perfect solution but it's a bit expensive for me.
Anyway, at WOT the ecu doesn't use the AFM/MAF or the NBO2.

M3 has a lighter flywheel it improves revving and better throtle response.

Yes it does use the AFM air temp sensor at wide open for important fuel delivery correction. without the AFM you would be too lean on colder days and to rich on warmer days.

all the best

[blueboi69]

Yes it does use the AFM air temp sensor at wide open for important fuel delivery correction. without the AFM you would be too lean on colder days and to rich on warmer days.

all the best

You are right about the temp sensor :cool:

[bmwman91]

The ECU most definitely does use the AFM at WOT. Believe me, I know from my experiences designing & tuning my MAF conversion! If you have the settings wrong and the ECU sees a bad air flow signal, you will run super rich or lean at WOT, which would not happen if it was ignoring that input. It uses both the AFM and IAT signals at WOT. If it was just using throttle position and RPM to look up fuel table bins, it would be more of an Alpha-N setup, which it is not.

You are correct that it ignores the NBO2 input, though. As far as I can tell, the ECU goes so far as to turn off the O2 Heater Relay when you are at WOT or over 4000RPM. This was the death of many WBO2 sensors (with my LC-1 setup) until I realized this and jumped the relay pins so that the O2 system always has power as long as the fuel pump is running.

[blueboi69]

The ECU most definitely does use the AFM at WOT. Believe me, I know from my experiences designing & tuning my MAF conversion! If you have the settings wrong and the ECU sees a bad air flow signal, you will run super rich or lean at WOT, which would not happen if it was ignoring that input. It uses both the AFM and IAT signals at WOT. If it was just using throttle position and RPM to look up fuel table bins, it would be more of an Alpha-N setup, which it is not.

You are correct that it ignores the NBO2 input, though. As far as I can tell, the ECU goes so far as to turn off the O2 Heater Relay when you are at WOT or over 4000RPM. This was the death of many WBO2 sensors (with my LC-1 setup) until I realized this and jumped the relay pins so that the O2 system always has power as long as the fuel pump is running.

Ohhhh that's more than an interesting information! I've never heard of that heater relay turning off.
Thank you very much, for this, I'll look after it!

[blueboi69]

The ECU most definitely does use the AFM at WOT. Believe me, I know from my experiences designing & tuning my MAF conversion! If you have the settings wrong and the ECU sees a bad air flow signal, you will run super rich or lean at WOT, which would not happen if it was ignoring that input. It uses both the AFM and IAT signals at WOT. If it was just using throttle position and RPM to look up fuel table bins, it would be more of an Alpha-N setup, which it is not.

Hi!

This is interesting, because the WOT map don't have a load axis, it's a table with one column.

Has anyone tried the acceleration enrichment yet?

[bme30]

I dont have that option on my xdf.

Ill check the other xdf i have from the tunerpro site.  It has a few things my current xdf doesnt have.  Fyi 175ecu

[blueboi69]

I dont have that option on my xdf.

Ill check the other xdf i have from the tunerpro site.  It has a few things my current xdf doesnt have.  Fyi 175ecu

I have, but not sure if it is working. It has 4 tables....
175 ecu with 378 software