2MuchRiceMakesMeSick

Who makes the best wide band that will work with hptuners in the future? Why are you replacing your knock sensors, are the ones that come with the stock motor not any good?

Another_User

I don't know...there are a lot. They are down to about $400. 98s have overly sensitive knock sensors. Plus mine are 6 years old anyways.

2MuchRiceMakesMeSick

This thread has such good advice I figured I would ask another question.
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Can someone explain PE to me an its relationship with VE (if there is any). I would like to know what it affects and what ideal values would be.

P Mack

iTrader: (6)

Just an example: let's say you're driving around mafless at 4400 rpm, 101 kpa manifold pressure, and your ve table says you should be at 90% ve. Also, the IAT is reading 59 degrees. From 90% your pcm decides that each cylinder, which has .709 liters of volume, is only filling 90% which is .638 liters. Using the IAT and MAP to find density, that comes out to .782 g/cyl.

Now the pcm has to decide how much fuel to add. Say you're below 20% throttle so the pcm is still shooting for 14.7:1. .782/14.7=.0531 so that's how many grams of fuel the pcm injects. Now if you were to mash the throttle and go into PE, and you had a multiplier of 1.2 in that cell, it would give you .782*1.2/14.7=.0638 grams of fuel. Does that make sense?

Another_User

You have the right general idea. But you aren't going to have 101 kpa at 20% throttle, and I am not sure that is how the multipliers actually work. Somebody else should be able to shed some light on that. But you have the right general idea.

P Mack

iTrader: (6)

You're right, 101 kpa isn't realistic for 20% throttle. I just chose to make it equal to standard day barometric pressure to make the math easier for me. You could change the numbers to whatever you want, but you get the idea.