Maximum boost thread (93 oct > pump petrol/gasoline only!)

[TitaniumTT]

My M820 will log speed, that's all you want to see right? Time and speed. You'll have to do the conversion from mph to that silly thing you see

[RICE RACING]

Originally Posted by TitaniumTT

My M820 will log speed, that's all you want to see right? Time and speed. You'll have to do the conversion from mph to that silly thing you see

As you can see in the Motec thread on the M170 (latest ECU fitted to a superbike) wheel speeds are totally wrong compared to even a ghetto GPS velocity trace (as per the Motec garmin ghetto facility logged on the ECU at the same time).

But at absolute MINIMUM I would like to see some kind of velocity trace, YES. If its based off wheel speeds then you are always going off a wrong trace then overlaid on top of that is the honesty of the calibration to make the speed reading right + the wheel slip factor added on top.

To measure velocity CORRECTLY to determine honest speed you really need a GPS signal, top shelf stuff is around 100Hz Ghetto like Motec is around 5Hz lol, either way its 1 million times better than a wheel speed trace

Consider your self edumecated LOL

p.s. To validate ANY claims of speed to distance I also want to see the hieght and slope of where you run, again any decent GPS instrument will allow this, most ECU hack boxes will not , run down hill = much much faster , most people cheat themselves LOL

[RICE RACING]

In all seriousness, PSI welcome, let us know who you are and what your set up is.

It sounds like its NZ or Australian to me, as no one I know would run a Microwreck product lol especially combined with a Link ECU haha.

If its a drag car link us some specs, times weight etc

p.s. I tuned a car with Microwreck ignitor with ICE boosters in 2004 with Water Injection and low AFR, it just always fouled plugs (racing ones). Given the Links ability to blow up engines when running CDI's if you use any of the limiting functions then this combo is probably not a bad thing anyway

[RICE RACING]

Originally Posted by TitaniumTT

My M820 will log speed, that's all you want to see right? Time and speed. You'll have to do the conversion from mph to that silly thing you see

Even in a near 700bhp car like mine with race tires on the back and true calibrated wheel speed sensors to the VBOX under acceleration you either have (under speed) on front wheels *due to them not being in full contact with the ground* even in 3rd gear! OR you have over rotation or wheel slip in the order of 4% or more @ 100mph. So you NEVER ever get a true velocity trace using wheel speed sensors.

This is why F1 cars run pitot tubes and also GPS speed traces to get true velocities.

I should post up a graph of time and velocity to REAL time and velocity off an ECU log v's a VBOX GPS log, in a short test like a 90-140kmh 3rd gear power band test you can have differences of up to 0.2 seconds (faster on ECU log v's a real log with a true speed trace that is accurate).

Velocity is NOT easy to measure, you need lab not LEB grade equipment to do so. Only company that does this properly is Race Logic and the top end gear VB3i is like 20k+ *fully kitted out* lol (I know I have it).