Today i was playing with Evoscan again and something eccured to me...

I am watching LogEntryEsconds against Speed...

Could i calculate from these two acceleration?

For example...

At 12.38 sec i have 62.13 miles per hour on 100% TPS
At 16.66sec i have 99.42 miles per hour having a 3rd to 4th gear change...

the difference is 4.28 secs... Could i say that my car accelerates from 60 to 100mph in around 4.5secs? How accurate this calculation is?

This was done on 22psi spike, i never see knock counts more than 1...

Any views on that?

 

I was actually wondering the same exact thing today when I was messing evoscan. If the sample rate is accurate, it should work out. Of course this is assuming your speedometer is 100% accurate.

 

There isn't much resolution on the speed.

Best to use a known gear on a known section of flat road and compare rate of change of RPM, if you want to be fancy you can use calcs based on gearing, tyres, frontal area, drag to work out power and torque, or use something like dataloglab or the upcoming version of Evoscan to do it for you.

 

Pretty accurate...as long as the mph are accurate....

 

The speedometer probably isnt that accurate, but the logger actually gets its input from the ECU so I would think it would be pretty accurate.

 

If you actually look at the data of the speed you will see that roughly 5 data points (during hard accel) are the exact same speed. From this I would assume the speed data is relayed about 5 times slower than the sample rate. But you can still get an estimate from it.

 

speed is very easy to calculate. you know rpms, you know the gear ratios and final drive ratio, and you know tire size. You can calculate speed directly from that.

 

So i guess the 60-100mph in under 4.5secs that i saw is relatively accurate...

That's a FAST car time.... :-)

happy...

ITs so cool how many things you can actually read from evoscan and similar software...

 

Doesn't dataloglab use these values to calculate acceleration and HP etc?