Jump to content
SAU Community

Recommended Posts

Hi guys!!

My GT-R is idling at 1050 rpm. Already cleaned the AAC valve before, butterflies were also checked... the car runs fine though. It's just the idle that keeps me wondering.

So GT-R gurus, is it just fine or there is something wrong w/ it? :/

Thanks in advance guys!

Edited by GodziRRa
Link to comment
https://www.sau.com.au/forums/topic/338405-gt-r-idle/
Share on other sites

My mate has a bit of poly pipe made up with a compressor attachment and hooks it up befor the intercooler and pushes compressed air into the plenum via the intercooler.

start psi low and move it up to around 20 psi you will find any leaks at all if they are there.Keep a spray bottle with water handy and a peice of hollow pipe to listen threw :).

motor off of coarse.

Link to comment
https://www.sau.com.au/forums/topic/338405-gt-r-idle/#findComment-5470768
Share on other sites

My mate has a bit of poly pipe made up with a compressor attachment and hooks it up befor the intercooler and pushes compressed air into the plenum via the intercooler.

start psi low and move it up to around 20 psi you will find any leaks at all if they are there.Keep a spray bottle with water handy and a peice of hollow pipe to listen threw ;) .

motor off of coarse.

Sounds like a lot of work. :D

Link to comment
https://www.sau.com.au/forums/topic/338405-gt-r-idle/#findComment-5473004
Share on other sites

The ECU needs to be put into base-idle mode or else when you adjust that screw the ECU will just compensate.

Moo - is that info from the shop manual? My memory is that you unplug the electric connector to the AAC to stop the compensation, then adjust the idle to where you want it, then reconnect.

Link to comment
https://www.sau.com.au/forums/topic/338405-gt-r-idle/#findComment-5475677
Share on other sites

another cheating way of adjusting idle is to have car warmed up, then watch AAC on consult and turn idle screw until its around 20-25. so depending if the AAC starts at ~20 (then u turn it until AAC starts to go up, then stop) or if it starts high (e.g. 40+) then you're turning it so AAC goes down until it stops going down. but this is when the car is running normally and just having minor issues, if there is something else causing high idle then this might not work.

e.g. i used to have warm start stalls due to AAC being too high (40-50) as idle was set too low and not having enough room to catch falling idle.

Link to comment
https://www.sau.com.au/forums/topic/338405-gt-r-idle/#findComment-5476146
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • @joshuaho96 Hmm considering the drama you've seen/experienced, have you looked into getting a built complete long motor shipped from Australia?  Considering the AUD is basically monopoly money when compared to the USD, at a glance this seems like a good option?
    • Bloody Skylines, they put you through the bloody wringer! Stick at it! Stunning drag strip BTW! Where is it? Can see part of the name on the slip and probably should just Google it!
    • I mean the other day I had to walk someone through diagnosing why their timing belt was walking off the cam gears. At least one of the issues was a bent tensioner stud. Local mechanics have found runout on the CAS mechanism causing weird failures. I'm also no saint here I've documented some of the things I've had to learn the hard way. Something I discovered recently is that my CA emissions catalytic converters weren't even welded correctly to align the downpipe to the main cat and they tossed the support bracket that goes from the transfer case to the downpipe to support everything there. I spend a lot of time chasing down these decidedly unsexy problems and the net effect is it feels like I never actually get to the original objective (flex fuel, VCAM, oil control, cooling, etc).
    • At times with how you make everything sound, all I imagine Americans doing when they see a gtr is standing there looking at it and bashing it with a gun like how a caveman would with a club and hoping it fixes itself 
    • I think this is just a product of how the US market works for this stuff. Shops are expensive and there's no real way of knowing what kind of results you're going to get, people don't really have the institutional knowledge. I have heard too much at this point to really put faith in anybody "full service" except maybe DSport and they aren't really a full service kind of shop. If you go to the right place I have no doubt they'll get it right for you. Some locals have set it up right but the cost really is nuts and even now they're still fighting issues. And you know I'm a crazy person who thinks things like twin scroll, relatively short low-mount cast headers, PCV recirc to intake, recirculating BOV, right-sized for ~400 whp, MAF load, validating all of that to a standard comparable to OEM test programs, etc are relevant. For what it's worth, multiple local owners at this point have been stuck in a perpetual cycle of blowing a motor -> getting someone to rebuild it -> some missed detail causes the bearings to wipe and spin just outside of break-in mileage or drop valves or some other catastrophe -> cycle repeats. I usually only find out about this because I'm perpetually helping random friends with diagnosing car troubles, Skyline or otherwise. The single turbo stuff if I'm honest is mostly secondary, it just doesn't seem to achieve the numbers in the ~2000-3000 rpm region that I would expect given the results I've seen here or in Motive's videos. I don't really know what we're missing here in the US to be causing this. Lots of people like to emphasize the necessity of finishing the project first and foremost, but I'm not made of money and I can't afford to be trashing a 15k+ USD engine build with any regularity. Or spending my relatively limited garage time these days unable to triangulate problems because too much was changed all at once. Also, even if it isn't a catastrophic failure I would consider spending the cost of single turbo conversion with nothing to show for it to be pretty bad. 
×
×
  • Create New...