Apexi AVC-R

91Supra313

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Jul 30, 2009
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Clarksville TN
Is anyone running one of these on their 7MGTE? I have just finished my install but as usual, I suck at programming. I want to run 12 PSI. The previous owner of the turbo that is in the car now said that it ( ct26 ) boosted to .9bar with no problems at all. So I figure if I can get 12 out of it then I will be happy. For some reason I just can never seem to get more then .55bar.
 

91Supra313

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Jul 30, 2009
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Well, if you are referring to the duty cycle, I have messed with that for about 6 runs on our test area here and nothing gets me over .55 bar right now. Which is why I was wanting to find someone that is running an AVC-R and then possibly get their setting from them if they are hitting .9 bar.
 

91Supra313

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Jul 30, 2009
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Everything is fixed now. I had to put the duty % up to 66% and now it is holding steady at .85 bar. Now if I could figure out how to change the bar to psi on this thing. Time to call ApexI on monday.
 

Keros

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Mar 16, 2007
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I just leave the duty alone and let it figure it out. That's the reason the AVC-R is so expensive, because it's pretty darn smart. I select what I want for boost and it figures out how to do it... setting the duty cycle manually is a fairly advanced feature, but I've found it's quite hit-n-miss for me. Perhaps more homework is required, but the auto feature works so well I don't see a reason to screw around with it.
 

A. Jay

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Jun 3, 2009
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If you can get close enough (if it's stable consistently for many runs), the AVC-R will take over figuring out the duty cycle differently throughout the rpm range. I have mine set for ~8.5 psi though (ct26, stock on intake side).

I don't know how you have it displaying in bar, mine's in kg/cm^3, so maybe yours is different but you can't change that on mine. I just picked several intervals in psi and converted them so that I have an idea of what I'm looking at.
 

Keros

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Mar 16, 2007
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Here's a manual link I found:

http://www.nissansilvia.com/forums/index.php?app=core&module=attach&section=attach&attach_id=65020

Pg 22 and 23 talk about setting the boost/duty. I think there's another setting involved... but like an idiot, I deleted the very detailed writeup I found about it. Anyway, if I remember correctly you simply have to get the duty cycle close and it will self learn at over 85% throttle. To do that, I started with the unit at stock wastegate settings (so the unit basically did nothing), and worked the graph higher at small incaments by increasing the boost up to 12psi. This allowed the unit to build on a duty cycle graph it already had, rather than starting from scratch with each boost level setting. I use setting B as max boost around home, setting A as medium for mountain passes going up and down, and then OFF is for when I'm at sea level.

I distinctly remember there being an "auto" setting somewhere that would force the unit to always self learn, overridding manual settings. But I think my brain is just makin' shit up...

Yeah, mine is kg/cm^2 as well, I have a graph in 0.5psi intervals written on the front of my manual (which is coil bound), that shows the conversions from 1psi to 16psi. This strategy worked well for my little CT26, I don't know how it would work for a bigass turbo.

Suppose I should have mentioned that by "selecting what I want", I only change it up or down 0.5-1psi or so, and it will self learn the new duty graph without me messing with it because the incriment is not large enough to cause alot of overshoot or low boost... close enough for the unit to just make a few little changes to trim up the duty.

IIRC, setting it the first time was an undertaking on a straight empty road. I'm really glad for Toyota's genius in designing fuel cut into the 7M ECU, or I'd have blown it up by now dinking with the AVCR.
 

91Supra313

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Jul 30, 2009
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Clarksville TN
Well funny thing is, I had it set perfect and it was holding .85 and now it is back down to the usual .5. And yes sorry it is not bar, I was just converting it. It is that weird crap. I still have no clue on how to self learn the ecu in that thing. Someone come over here and do it for me please...lol. I figured it out before, I will just have to go and drive around some more to figure it out again. I think I changed one of the settings on it. Plus for some fucked up reason my car does not have a speed sensor wire to the main ECU. So, I wired everything up except that. BUT it doesn't tell me the injector info. I have that wired up as well. I just need to get this car back to the states and rewire EVERYTHING. Time to hunt down a fields harness somewhere.

---------- Post added at 10:53 PM ---------- Previous post was at 10:50 PM ----------

Oh and this is on a stock CT-26.... FOR NOW.
 

Keros

Canadian Bacon
Mar 16, 2007
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If it is a function of neccessity, would it be wise to just turn off the unit and let the wastegate spring moderate boost at minimum?

Anyway, make sure that the vaccuum fittings are piped correctly, if they're backwards things just won't work right. If the N/O and N/C is not correct, it'll do some weird stuff.