I am just wondering when do the Reactive Solenoid Tables interpolate?

Reactive Solenoid Base Map WGDC #1A (High Gear Range)
Reactive Solenoid Base Map WGDC #1B (High Gear Range)
Reactive Solenoid Base Map WGDC #2 (Low Gear Range)

I know the Low gear is mostly 1st gear... maybe a bit of 2nd gear.

But I was looking and change find when #1A and #1B interpolate with each other. So is 1A work 3-4th gear and 1B is 5th gear? Or are these coolant temp related values?

I know the answer is floating around somewhere but I did not have luck finding it.

 

I thought the switch between low to high was established in the mph crossover set speed table.

 

So for example if you set the the crossover 75mph after that speed the car will use MAP 1B ?

Map Switch Break Point
This single value is a ratio of RPM over speed. This ratio is used to determine when to switch from boost
target map A to boost target map B. When below this ratio MAP A is used. When above this ratio map B
is used.
Tuning Tips – We have no tuning tips at this time. This value could be used to create a low vs high speed
boost control system. The stock MR uses this to reduce boost in lower gears.

 

Not quite. BigT has it though. Also, it's not just for reactive solenoid maps.

The way it works is that the ECU calculates the value based on the current RPM and the current speed. I have the actual calculations based on the Evo's gearings, based off of mrfred's work on the 8 and 9s. For myself, the magic number is 75 for the crossover. Basically, when the RPM/MPH is BELOW the crossover point, the ECU uses the High Gear Maps. The High Gear maps (The #1A's) are used for Passive and Active WGDC, and Target Load. You can see these in ECUFlash.

Evo X GSR
* 1st gear = 175 rpm/mph
* 2nd gear = 119.3 rpm/mph
* 3rd gear = 88.4 rpm/mph
* 4th gear = 67 rpm/mph
* 5th gear = 46.5 rpm/mph

Evo X MR
* 1st gear = 194.3
* 2nd gear = 125.9
* 3rd gear = 93.2
* 4th gear = 70.3
* 5th gear = 53.6
* 6th gear = 41.2

As you can see, each gear has a RPM/MPH, which varies only slightly. If you set your Crossover point at 75 (like I've done), It will use the tables #1A for gear 4 and 5, but use tables #2 for 1 - 3 gears. This makes it very easy to tune boost without overboosting in high gears, as you can tune 1-2-3 and 4-5 separately.

Really, all you need to do is change the crossover point to 75. Make the boost tables the same as a starting point, then adjust them as you see fit keeping in mind that you can adjust the gears separately.


Have fun!

 

Also, the original crossover point is set very high, so that only first gear gets any of it. I think it's 145 or something, it's been a while since I've played with them.

 

That's what I thought more or less.

So, MAP #1B is never used?

Only MAP #2 is used for gears 1-3 if you use 75 crossover.

Only Map #1A is used for gears 4-5 if you use 75 crossover.

Is this correct?

 

I'm sure that there is a time that 1B is called, but you'd have to ask the people in the know. I just copy A to B. I'm pretty sure it's very infrequent if at all.

 

Thanks for the valuable information.

Wish I could e-rep.

 

Also, at high elevation, map #1a gets used all the time, instead of 1B. EDIT: See two posts below this.

 

Really? Even with the crossover set lower?

Interesting. I wonder what the triggers are then. A combination of RPM/MPH and Barometric pressure.

 

Actually, I didn't touch the crossover. And I take back what I said about it being used in all gears. Sorry for the confusion - I will edit my original post.

EDIT: My comments below may be out of date. I've since found other posts where people say their cars use 1a as well. My dialogue with gunzo was quite a while back, so it might not be the most up to date. Can anyone verify if their car uses 1a or 1b in third gear?

What I should have said is that 1A is used at higher altitude (lower air density). I believe (in talking with Gunzo) that most cars at sea level use 1B, and never 1A. This was discovered on the dyno when changes to 1B had no effect, and it was obvious the car was using 1A. According to gunzo, 1A is not used for most people at sea level. Could someone else confirm there car is using 1B. An easy way to test is to set reactive WGDC to 50% in 1A, 100% in 1B, then do a third gear pull while logging active wgdc and see which value it's set to.

 

Hmm... interesting thanks for posting this information.

 

very interesting , learning something new everyday ... so what are the results ?

 

Bringing this post back from the dead ... can anyone tell me why my stock 2010 X SE would have the Xover set at 161? I mean dang that means I am not even using my low gear maps :O

EDIT: Leaving the above for posterity ... beyond that, never mind, I see what is happening now and what Gunzo is doing with his boost maps.

 

Since boost is the same for all the gears... so just 1 set 20-21 psi for all gears.