Big Problem....avcr Spiking !!!!!

[55UBI]

hey guys im stuck big time

ive got a 32 gtr, avcr, exhaust, and filters.

with the avcr, it spikes like a fking cactus, i have 2 settings, .7 bar, and .9 bar. Both never drop below .9 bar, but in the menus it says .7 for A and .9 for B... wtf? neways the major problem is the fact that im getting .9 in 3rd 4th and 5th, but in 1st it ranges from 1.2 bar right up to 1.49 bar being the highest i have seen......yes it fkn scared me too as far as i know i have stock turbos.

so does ne1 know what i can do with it ?? is there any settings, duty cycles, gear judge, nething at all that u guys know of that i can use to correct it ?

any help at all would be great thanks every1, if any1 has a gtr and using an avcr, can u please pm me that would be great !

thanks in advance

steve

[YO880]

hi mate,

If you turn the AVCR off (as in not setting A or B) what does it read? my understanding is it should read 0.7bar (mine does), might prove it is hooked up properly

I also run it with 0.9bar, i will check what my cycles are for you when i get a chance

[55UBI]

sweet cheers mate

i was told leaving it on OFF shuts the wastegate and it just spools until turbos shatter..... ?!!

steve

[YO880]

no, my understanding is it should stop at the factory boost level (.. mine certainly does.. and there is no sign of the original boost actuator in the engine bay (the car came with mine)

hopefully someone here can confirm for you, but it certainly is on mine

the way i would think it works is the controller keeps the wastegate open for longer periods of time (to make more boost), when the controller is off, then the normal pressure would apply (which the wastegate is set to 0.7)???

[Roy]

I fyou have the usual breathing mods then you will naturally see a small boost hike. So turn the thing to "Off" ... ti wont blow anything. the car will drive at whatever your lowest boost setting is.

I guess with exhaust etc you could be running as high as 12-13psi , if the restricot has been removed then you will actually be running 1 bar. So its not your AVCR thats spiking.

So lets assuem that with the theing in "off" it reads 0.85bar. You will never be able to run 0.7bar. Its impossible.

So lets say you want your settings to then be 0.90bar (A) and 1.0 bar (B). Set "A" to 0.90bar and duty to about 20. The thing will hold boost and afetr a few hits it will start to learn...which bring me to the next question. Who installed your AVCR? There are two variations on the install. Easiest way to identify is if your injector readins make sense or not. If they look a bit screwy then the thing should self learn a lot quicker.

For "B" set it to 1.0bar and again start duty cylce around 25, if you fall a bit short of makign 1.0bar then try a duty of arounf 28-30.

if your car was an R32 GTST i could tell you how to set it up easy, but id suspect GTR would be a little difference with regards to the duty setting.

But first things first. turn it "off: and give it a good hit in 3rd and 4th gear and see what your peak recall is for boost

[Yorik]

The AVC-R is an amazingly powerful EBC, download the manual and read it, many times, from what you are talking about here, ti seems that your Gear based Feedback is set incorrectly and your gear based initial duty cycle is also incorrect.. These are critical elements in tuning your AVC-R properly, I spent some hours and lots of fuel tuning my AVC-R on my 180, tuning on a quiet road (lots of quiet straigh road up here.)

Basically if your feedback setting is too fast or slow in high gears the AVC-R will do one of three things, fluctuate rapidly, drop boost, increase boost. The effect that you get is also dependent on the Duty cyle of the RPM based settings..

Here is the process that I found best to tune my AVC-R: (may or may not work for you)

1. Set the intended boost pressure at about 0.2 kg/cm above your wastegate actuator level
   
2. Using the process from the manual, get the AVC-R into learn mode and drive around until it can hold the boost pretty closely.
   
3. Pick a gear to tune the start off with and stick with it (2nd gear is good)
   
4. Set the gear based initial duty cycle to a figure where it doesn't spike coming onto boost
   
5. Set the gear based feedback to a level where it holds boost through to red line (or theoretical max).. Tuning too high or low will exhibit strange results, this can take some time. This is also a broad range setting so get it as best you can
   
6. Adjust the gear based initial duty cycle so that boost comes in as early as possible without any spiking (this is always fun..)
   
7. Go back to RPM based duty cycle and iron out the dips and peaks, the AVC-R will actually do this itself in Fuzzy logic mode if you have gear based learning turned on, but it is slow to do so.
   
8. Tune the next gear in a similar fashion to above..
   
9. After each gear is tuned you will notice that the numbers in the Gear based feedback settings follow a pattern, this is where the speed of your actuator is coming into play..
   

All of the functions int eh AVC-R are there for a reason, the fuzzy logic has boundaries, some of which I find to be a little restrictive, but considering that the unit needs to be able to go into "anyones" vehicle they have cut it down far enough.. In the cases where the self learning doesn't work quick enough or doesn't adjust far enough, it needs to be helped along the way with some manual intervention..

If you can read and understand the manual and what each function does than the AVC-R is a perfect EBC for you, if you don't understand it, take it somewhere and have it professionally tuned..