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Discussion Starter #1
It appears that most of the high HP supras use the HKS EVC EZ. Although it lacks the features of the EVC4, the feedback seems to indicate that by not going fuzzy logic (EVC 4) the boost is more stable.

My question is this: If you disable the fuzzy logic on the EVC 4, do you get the same stable boost as you do with the EVC EZ? Seems like the best of both worlds; stable boost with all the bells and whistles (scramble boost, high-lo boost settings, etc).

Is anyone out there using the EVC 4 this way? Good results?



Bryan
 

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HKS evc4

I need help with this thing too. Can some make sure I am reading the instructions right on this thing. I am using a single turbo and use the bottom of the wastegate to hold it closed longer. lmk Thanks Richard
 

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I plan on using an EVC IV in exactly this manner when I go BPU. According to HKS the entire EVC line of electronic boost controllers (EZ, IV, and PRO) all use the same exact stepping motor to control boost. So, in theory you should be able to disable the self-learning mode (also called fuzzy logic) of the IV to make it work just like the EZ with some additional features. If you look around hard enough there are English instruction manuals floating around for the EVC line of boost controllers.
 

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Here is how you tune it, the settings will be a little different on a Z, but the fuzzy logic should work well, it just won't work on a Sequential set-up.

Functions:

Setting the volume knob: Whenever you make an adjustment the settings, you may see a flashing L, turn the knob down (counter clockwise), then it will show a flashing H, turn the knob up (clockwise). Turn it back and forth as instructed until it sets itself.

Mode: Allows you to change EVC settings. Hit once for Offset.
2 times for Scramble boost, amount to add to the preset boost (i.e., 0.2bar).
3 times sets the length of time for the "added" scramble boost to last (0-30sec.)
4 times for Overboost Warning Mode. (***This is very important, if it hits higher than the overboost setting, the unit will shut down to stock boost. This will keep you from blowing up your car***) Always set this after you reset the EVC. Put it 0.1 to 0.15 higher than the high boost you are planning on running.

Alt: Switches between high and low boost mode. Lights up Green in Low, Red in High Mode.

Power: Duh!

Scramble Boost: Activates Added boost for the period you set with the mode button.

Resetting the EVC: Hold the top 2 buttons along with the lower right button to reset it. (Mode, ALT, and Scramble)


Tuning for Supra:

Turn the power on and reset the unit.

Turn the knob and set your stock boost.

(if you don't know it, set it at 0.65, hit the scramble button, and then go to redline in third gear. This is your Max stock boost. reset the EVC and then use this number)

Hit the scramble button and then add 0.15 bar to your stock boost (i.e., if your stock boost is 0.9 then enter 1.0) then hit scramble again.

Important: Hit mode 4 times to set your overboost.

Boost will now be set at you stock boost in low mode. Hit ALT to switch to High Boost mode and enter in how much boost you want.

Go do a 3rd gear pull and see if you get the desired boost. If it makes more boost than you want then reset the unit and add 0.5 more to your stock boost (0.2), if you get less, then add 0.5 less (0.1) etc.

If you can only get so close, you will have to use the Offset feature.

Hit the mode button once, and you will see 100. If you are overboosting, turn it up (between 101-150) if you are underboosting turn it down (between 99-50)

TTC Tuning:

Reset the EVC.

Hold down the ALT and Scramble Buttons (the 2 right buttons)
This will put the EVC in Learning Mode and display a L on the screen.

In third gear, accelerate until the EVC beeps and displays an H. (this may or may not be to redline.

Again in 3rd gear, from the same RPM as the first pull, go all the way to redline and let off. The unit should then beep and show your stock boost. Go ahead and set your overboost and then your desired boost level.

If you don't get desired boost (assuming its realistic), or it didn't go from L to H, you need to start from scratch.

If you still don't get the desired boost, you can use the offset button explained above to fine tune things.

If you can't get the unit to go from L to H, then you are either doing something wrong (i.e., not following instructions or are in Sequential mode). or you have some sort of vacuum or boost leak that is making boost inconsistent, keeping the EVC from learning your boost curve.

I take no responsibility for your actions, but as long as you set your overboost correctly you shouldn't be able to blow up anything. For the record all test pulls should be done on a closed racetrack.

Happy Boosting,

-Ryan Hawkins
 

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Discussion Starter #6
Peak Hold..

The EVC does not have any peak hold feature.

It is best to get a peak hold guage for that. It's also a good way to make sure the EVC is boosting where it says it is.

Bryan
 
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