I've hit a block while trying to understand what each map does for my EDC16U1.

If I look at 2500RPM and 35mg IQ I see values of...

• 42.7% in the N75 table
• 2080mbar in the Turbo Boost table

I'm struggling to see how these are independent of each other :crazy: .

Is it saying that the turbo will be set to 42.7% of whatever is used there (vacuum duty cycle maybe?) and the intercooler sensor will look for 2080mbar - giving an under / over boost error if something like that value is not seen?

Or something else?

Your N75 table describes how much the turbo should close it's vanes at the given Rpm.
Higher numbers mean more closed vnt vane so more air going thru the turbo and making the turbo work "harder".

So if your turbo boost request map is set to 2080mBar at that given Rpm, the manufacturer calculated that the vanes should be closed for 42%.

When reaching that Rpm, your ecu knows in advance that he needs to close the vanes that much. If your ecu detects lower or higher boost at that Rpm it wil open or close the vanes more.

If you got a stock turbo I would not touch the N75 map.
You can research what the max safe boost is for your turbo and increase the boost request map. By adding more fuel, the turbo should spool faster and give more boost without needing to change the N75.

From my understanding the N75 needs to modified when changing the intercooler (FMIC), mounting other turbo than stock, or changing the downpipe (exhaust which reduces backpressure).

capske wrote:Your N75 table describes how much the turbo should close it's vanes at the given Rpm.
Higher numbers mean more closed vnt vane so more air going thru the turbo and making the turbo work "harder".

So if your turbo boost request map is set to 2080mBar at that given Rpm, the manufacturer calculated that the vanes should be closed for 42%.

When reaching that Rpm, your ecu knows in advance that he needs to close the vanes that much. If your ecu detects lower or higher boost at that Rpm it wil open or close the vanes more.

If you got a stock turbo I would not touch the N75 map.
You can research what the max safe boost is for your turbo and increase the boost request map. By adding more fuel, the turbo should spool faster and give more boost without needing to change the N75.

From my understanding the N75 needs to modified when changing the intercooler (FMIC), mounting other turbo than stock, or changing the downpipe (exhaust which reduces backpressure).

Do we need to extrapolate the values if we increase IQ?

I would not change the values of the N75 map.
Concerning the boost request values you don't need t extrapolate if you increase iq. Just increase boost to a safe level that meets the requirements of your turbo.
If you raise iq, you will need to raise the boost to obtain an equal air fuel ratio.
If you don't raise the boost you will need to mess to much with AFR/lambda, or your IQ will be limited by AFR map.

To be able to burn more fuel, you need more air.