[Boz335i]

I did some logs at the pod on Sunday, opened them up and thought great, look at all of those stats, but I have no idea what they mean.

I went to the N54 tech site and found these explanations, but still have no idea. I wonder if somebody could explain the following in laymens terms?

Thanks

Target = Pre-Boost setpoint in PSI.... the requested Pre-boost value the JB4 is currently requesting.

Pre-boost = Boost pressure prior to the throttle valve... measured by the TMAP sensor.

PWM = The additional signal, in percent, that the JB4 is applying to the boost solenoids. This is in addition to the signal applied by the DME (ECU).

ECU PSI = the JB4 generated signal output that the ECU reads as pre-boost... to keep the ECU "happy". On map 0 the ECU PSI = Pre-boost = actual TMAP output.

DME BT = ECU generated boost target (setpoint) in PSI. .... the requested Pre-boost value the ECU is currently requesting.

Also ignadv, dutycycle.

[idnan]

I'll try my best but I'm still not 100% on it myself:

Target - The boost that the JB4 is requesting
Pre-boost - The boost pressure that is measured
PWM - This is the amount of extra work that the solenoids controlling the turbos have to do to acheive the target boost.
ECU Psi - To prevent the ECU creating error codes for high boost levels, the JB4 tells the ECU that the boost is lower than it is.
DME BT - Not 100% but I think it is the target boost that the ECU wants before it is modified by the JB4

Ignadv measures the timing of the engine as recording in cylinder 1 I think. As far as you are concerned you don't wan't timing drops towards the x axis on your graph.

This is my understanding of it but anyone is welcome to correct me if I'm wrong.

[Boz335i]

Originally Posted by idnan

I'll try my best but I'm still not 100% on it myself:

Target - The boost that the JB4 is requesting
Pre-boost - The boost pressure that is measured
PWM - This is the amount of extra work that the solenoids controlling the turbos have to do to acheive the target boost.
ECU Psi - To prevent the ECU creating error codes for high boost levels, the JB4 tells the ECU that the boost is lower than it is.
DME BT - Not 100% but I think it is the target boost that the ECU wants before it is modified by the JB4

Ignadv measures the timing of the engine as recording in cylinder 1 I think. As far as you are concerned you don't wan't timing drops towards the x axis on your graph.

This is my understanding of it but anyone is welcome to correct me if I'm wrong.

Thanks very much That makes a lot more sense to me.

I've noticed that at low boost of 3-5 the Pre-boost can be half of the demand. 5-10 it's about the same, and above that the pre-boost can be more that the request in most cases. Not sure if this is telling me anything?

I did notice that when I first put the JB4 in, the engine felt a little lumpy (slight missing) and a bit of lag on map 1, then it settled after a while and after a month or so was pretty awesome, with no lag at all.
I've had it out for a month and now put in back and it's the same again. Do you think the car adapts after a while?

[neil@JuicedUpTuning]

Originally Posted by Boz335i

Thanks very much That makes a lot more sense to me.

I've noticed that at low boost of 3-5 the Pre-boost can be half of the demand. 5-10 it's about the same, and above that the pre-boost can be more that the request in most cases. Not sure if this is telling me anything?

I did notice that when I first put the JB4 in, the engine felt a little lumpy (slight missing) and a bit of lag on map 1, then it settled after a while and after a month or so was pretty awesome, with no lag at all.
I've had it out for a month and now put in back and it's the same again. Do you think the car adapts after a while?

That's the adaptions of the car. Take the car and perform a number of WOT runs through the gears a few times and things should settle down

[Boz335i]

Originally Posted by neil@JuicedUpTuning

That's the adaptions of the car. Take the car and perform a number of WOT runs through the gears a few times and things should settle down

Thanks Neil, I will give it a go

[m1bjr]

Plonk it on map5 and forget it.

Its nice and cold out now, fill it with V-Power and rag it for a little bit once warmed up properly.

There is more headroom on Map5 than One. So potentially more output and its very safe.
I have played with it quite a bit and run a lot of logging.
The oem maps and adjustments are very conservative - you'll be fine on 5.

[Boz335i]

Originally Posted by neil@JuicedUpTuning

That's the adaptions of the car. Take the car and perform a number of WOT runs through the gears a few times and things should settle down

Hi Neil, attachment on this post.

[m1bjr]

Blimey - you dont rush things do you?

[Boz335i]

Originally Posted by m1bjr

Blimey - you dont rush things do you?

Haha, I didn't realise it was that long.

[m1bjr]

Originally Posted by Boz335i

Haha, I didn't realise it was that long.

You know my wife?