Usually around 0.3 bar if accelerating relatively quickly from a light. N75 can’t control anything under wastegate cracking pressure. I’m not a tuner, but I imagine you would dial in load % to keep it happy/linear under wastegate pressure, where most of your day to day driving takes place, especially with stiffer gates.

 

When cruising the dash gauge will show positive pressure, but at times actual will be zero. Need to see a real reference, it really varies from the dash gauge.

 

Yes, I can get two different values between the dash and an obd monitor, which is interesting because they should be the same signal.

 

Pretty sure it's 0-5V output from the map. Software can scale that however it wants, hence why the dash and logs don't always match. I've seen the same thing with maf/O2/ect. voltage. Wideband O2 gauges are notorious for this, where your logs won't match your readout on the gauge.

 

The signals to digital displays are generally filtered so people don't complain about a number not being stable

Give me a torque curve that stays flat to redline, or at least close enough to flat that the power peak is at highest rpm rather than nosing over before redline

 

The word "linear" has been used several times.

What does this mean in this context?

Chris

 

Arranged in or extending along a straight or nearly straight line.


Diesels taught me that.

 

The "linear" fans would probably really like K24s.

 

We do!

 

Or any car with a blower.

 

The dyno charts here:

https://rennlist.com/forums/996-turb...l#post19677464

Are these a good example of the "linear" you guys are talking about?

I would call this flat first, but yes these are also linear.

Chris

 

That is some serious linear goodness.

Also love how the afr is also linear.

 

I will say the K24s feel really safe at the track, like it's not hitting too hard or going to spin me out. I'd go for more bottom end on the street.

 

By definition,

A "linear graph" is a graph that is represented by a straight line, showing a constant rate of change between two variables, typically plotted on an x and y axis; essentially, it visually depicts a linear relationship between two quantities where the data points form a straight line when connected.

To me, the following is true of the torque and HP curve in the dyno chart below. From 4000 to 7500, torque is flat but also linear. HP is only linear. I would describe the torque flat and HP linear in this graph. When a doctor says someone "flatlined" on the ECG, their heart stopped and the line looks like the torque on this graph.

 

Ok, so the flat torque curve is more desirable than a falling torque curve.

I think for a road car a slightly falling torque curve feels a little more natural. To me the flat torque curve feels like this mad rush for redline: Appropriate in a race car, but maybe less so in a road car. Probably a matter of opinion, especially if you don't have a self imposed torque limitation.

I would guess that everyone would agree that getting the flatness established sooner would be better. The Powdrhound example gets flat at 4k. What's optimal? 3k, 2k? People talk about "lugging" sometimes. That is another term without a specific meaning. Most of the modern DFI 2.0 liter 4 cylinder engines can get to peak torque at 2000rpm. Is this lugging?

Chris