Avcr Settings For A Gtr - Setup Help Needed

[GTRNUR]

Hi all,

Thus far ive been content with 0.7 bar 30% duty, but im cautious about messing with the settings as im still running stock ceramic turbos. The car is a 96 vspec GTR and has all the other major bolt on mods. HKS 100mm intercooler, ARC intake, Nismo front pipe, HKS exhaust. The AVCR setup is currently done very basicly since it lost all its config when I had a battery go flat a while back and attempting to start the car resulted in the thing losing all its settings.

So after reading a ton of posts and documentation on the net today im now pretty confused with where to start. I figured that surely the setup for a GTR with stock turbo's has got to be done to death, but I cant find many actual proven settings out there.

What Im after specifically is the recommended gear judge settings, recommended feedback settings and some indication of what duty cycle settings will produce what kind of boost pressure levels.

If anyone has all their NE points documented for any particular boost level I'd be interested in a look. The only info Ive found so far is all for boost pressure's above 1.2 bar, so useless to me.

Cheers,

Ian

[paulr33]

its like any boost controller, you set the target boost you want to run

and set a low low duty. floor it in 3rd gear or take off in 3rd and load the engine up

watch what max boost you hit (make sure its low) and when it hits target boost

then slowly increase duty to make it ramp to the target quicker

increase the duty in small parts. if you see the duty too high

it will ramp to the target boost and fly past it, typivcally resultsing in the controller struggling to maintain pressure

ie: it will bleed past the target. some controllers can detect this and cut out / safety cut so be aware.

so set your boost to whatever you want to run say 0.85 or whatever you think is safe (check before gussessing)

and set the duty low, say 30 or 50 and drive, if it takes ages and ages to make 0.85 or if it never does

increase it a little and repeat. try say 60 or 65. dont test it in low gears, try it in say 3rd

bog the engine down heaps in low RPM and let it spool slowly

dont test and try settings in 1st or 2nd gear

it will be too harsh and will ramp instantly

try say 20kmh in 3rd and floor it, it should be laggy as and prefect for testing duty / boost gain settings

THE hks evc III manual auto setting mode states to take off at 0km.h in 3rd gear

and floor it until redline to test gain and duty settings

[GTRNUR]

Thanks Paul, ive read quite a lot of your posts and your documentation on the FC over the past few weeks. Very informative. So any idea's about gear judge and feedback settings? I presume all these setups are done with learning mode on still too right? Ive seen other threads where people turn learning off so they can set the RPM NE points indivitually.

Another thing Ive just read was that with feedback it needs to be higher in the lower gears (4-3ish) and then go lower per gear till 4th and 5th.

So I think I understand about the duty now. Once I get that correct so that it doesnt overshoot the boost level, I can then play with the start +/- settings for each gear to optimised the rate of boost response for each gear right?

[paulr33]

theres a video on youtube for AVCR tuning

its the best source of how to tune it that i have seen

worth watching a few times

[GTRNUR]

Im still looking... Youtube has too many distractions and not a good enough search engine...

On another note, my TPS readout doent go to 0% when the throttle closed. How do I calibrate the 0 throttle setting on the AVCR? I tried initialise a couple of times but that didnt seem to help.

[paulr33]

under setting ETC

somewhere in there is the THR type, its either an up arrow or a down arrow

when you mash the pedal it will show you the % opened. so you just change the item

just download the avcr manual - i think its even on my website paulr33.skylinesaustralia.com

if not, try the VAFC manual, it has the same THR setting and control

[paulr33]

where are u located? might be easier to find someone in your local chapter for some help

[Finchy33]

Paul, do you have a link to that youtube video?

I've seen it mentioned before but haven't found it...