I've been reading the WinPV manual in order to try and learn a little bit about this product. I THINK I'm going with it over the PCV (despite the apparent shortage of base maps, I like what I see so far).

My question is....what the heck is KPa?

Near as I can tell, as compared to my old T-Max, it's throttle position?

I can't find anywhere in the manual where it's defined. I guess it's one of those things I'm just supposed to know!

 

It's a measurement of pressure.

 

Ok, now I'm even more confused. Thank you though.

 

Amazing what we can learn doing a search..
http://www.asknumbers.com/kilopascal-to-psi.aspx

 

I did that, thank you, I'm trying to figure out the relationship to tuning a bike. Can you explain it in laymans terms and actually be helpful?

 

its basically psi (just measured metrically) ...whats is the context in the manual etc.?? are they talking about intake vacuum??? engine compression???

 

If you are going to buy one, but it from www.fuelmotousa.com They are THE guys to deal with for Dynojet products.

 

Here you can see KPa is used to display Manifold Air Pressure (MAP).



MAP is a measure of the pressure within your intake manifold. For our engines, it usually goes from 0 to -14.7 PSI...this means that normally there is a vacuum in the intake manifold. This makes sense since an engine is nothing more than a giant air pump...pulling air in from one side (intake) and pushing it out the other (exhaust).

In tuning, MAP coupled with RPM and Throttle Position (TP) will give us an indication of the load conditions being placed on an engine. Note that the closer you are to idle, the more vacuum you'll have in the engine. The closer you are to WOT, the closer the engine will be to 0 PSI...which is basically saying the pressure of the air inside the intake manifold is the same as the pressure of the air outside the engine.

Now right now I'm REAL foggy on data as far as how the KPa number changes as vacuum pressure changes (don't remember how they convert it...in the picture above the engine is not running thus the MAP reading should be 0 PSI...perhaps 100 KPa = 0 PSI??? Too lazy to look it up at the moment) but basically a change in TP does not necessarily equal the same change in MAP PSI. For instance, going up a hill...you may give it more throttle but because the engine is not increasing RPM at all (We're prettending you're just trying to maintain speed up a hill here) the change in MAP PSI won't be the same as though you were accelerating on flat ground with that same Throttle Position.

If I had one of my scan logs with me you could see how the MAP KPa changes with different RPM and TP variables.

As you can see I own a PowerVision. Don't worry about a lack of base maps, you don't need them. Have FuelMoto (where I got mine from) set you up with a base map and then use the PowerVision's AutoTune Basic (Or AutoTune Pro if you splurge for the Wide Band O2 add on for it) feature to dial it in to YOUR bike. This is what I did. I loaded a base tune from FuelMoto then rode around for about 100 miles to let the ECM "learn" the changes. I noticed by the end of that period that the engine was popping bad on decel. So I started scanning with the PowerVision using FuelMoto's directions. I made about 4 different 30 minute scans in all different riding styles...some twisty back road, some urban light to light, some 70mph crusing on the freeway...and then let the software FuelMoto provides tweak my fuel and timing tables based on those scans. I then uploaded that new tune and the bike runs GREAT now. THAT is why I got the PowerVision to begin with.

 

Thanks Robotech!!!!