Jump to content
SAU Community

Recommended Posts

Hi guys,

My r32 Gtr is on dyno and has a missfire on gate pressure of 9psi. Engine is a forged std stroke 26 with jun 264/270 9.5 mm lift cams (I think as these were purchased before my surgery) it has adaptronic ecu, split fire plugs running map sensor . New coil pack harness and bosch 2200 cc injectors with resistor removed. My tuner (jez) is awsome and has tried plugs, coils, harness , cas, adjusting cam timing as well as tune. He has adaptronic guy coming tomorrow to hopefully fix it but any ideas are welcome. He also did comp test which came back perfect. The engine also has new -5 turbos with ported manifolds and the head is mildly ported if that helps and smoke test showed no leaks at 2psi. The car was and is very difficult to tune and was a pig to get running at first, right now it has fresh shell 98 but has a flex fuel sensor waiting e85 tune if we can sought this miss out. Any help is appreciated

Scott

Link to comment
https://www.sau.com.au/forums/topic/426027-miss-fire-on-dyno-rb26-any-ideas/
Share on other sites

  • Replies 60
  • Created
  • Last Reply

Top Posters In This Topic

Qualify - I don't know much.

But I would place a bet on your adaptronic ECU.

and therefore the course of action being taken by Jez and yourself.

Not much help but I think your on the right path.

Edit: Don't stress over it tonight :thumbsup:

Edited by Sinista32

I didn't but it was built by an engine builder in qld and was running 387kw without dramas when I purchased the engine it had travelled about 2000ks inc dyno work only change is cams and big end bearings just because I had sump off

Andy and jez spent 4 hours with it last night, swapped to another adaptronic , swapped injectors and problem still there so it's thought that its either due to wasted spark system or a mechanical fault yet undetermined. Jez is installing a nistune to see if it makes a difference other than that only thing we can come up with is put cams back to stock ones and if that doesn't work I guess engine out and full strip rebuild and blue print if all cc size of ports and seat pressures , ring gaps and clearances etc, fingers crossed but I'd love some ideas or if someone has experienced similar thing? I've search for at least 6 hours and I've found cams with Hyd lifters can cause missfire but these are solid type drop in juns? So no idea really

oh that was you that came past Jez's yesterday (he told me when u left) that was me working on my car while it was on the dyno...

he did mention (and I herd when he started it) that your top end is Very noisy, not sure if this may result in the problems you are having ?

Nice car mate very neat Install and nice power too! It seems I was ripped off with cams from a seller on here whom I can't remember due to surgery well there is a lesson don't buy important parts after brain surgery lol. Jez changed cams and it silky smooth and quiet. It seems I must have measured clearances wrong in thou instead of mm or something cause clearance was at least .75 when should be .30. Base circle much shorter as was duration and lift about the same. So stock cams back in and see how it goes tonight! Fingers crossed as we have both had enough of it that's for sure!

thanks mate she is my baby !

exactly lol always important to check clearances with every cam install !!! and if the base circle was smaller then it would definetly need new shims etc

well fingers crossed all goes well now keep us updated !

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

    • I just got this system but haven’t installed yet I got a Moroso sealed box (defect reasons) which will be set up same as their pic The quality is high grade, the correspondence I had with the owner (former head designer for Rockford Fosgate) was unbelievable, guiding me with what I needed. Even told me not to buy some things as it could be sorted in a different way at his loss. Just a bit of a bite with the exchange rate and don’t purchase gear in 1 hit that goes over $1,000 au, lol I forgot!  
    • Thanks mate for that reply. Very helpful.    it’s a 2022 400R so would most likely lose those features as you say.     I did a quick compare of a rv37 nav and heading for sale in Japan to q50 model. I’ll pop pics below. Seems  Japan spec head into top, nav unit second below it   below pic Q50 aud delivered     differences seem to be Aus delivered has a different plug top left hand side of head unit- not sure what and where it goes.   and nav unit Japanese tv37 had an extra plug put    Again I’m really not sure what each of these differences mean!       the actual plugs on a v37 and q50 screens look identical on both screens… pics below for comparing. (One screen was is a us delivered one) but should be same gps signals etc as Australia.    If it were as simple as swapping a nav unit from q50 aud delivered im interested -just want to figure out what the missing plug is for before spending big $ on a second hand part for it to not work, and I guess with the head unit, if the band expander does the job (I got a 20mHz so should get the range I’m after) so should narrow my issue down to nav unit only.  I’d love to know what the extra cable on rv37 does and if I eliminate that part what it’ll do to the setup,    and also, if I can figure out what that head unit plug difference is, what does that cable do and where does it got can it be altered or re-plugged?! Excuse my ignorance what is ACP/AA, what does that stand for? (Apple car play? Android air play)? so If I swapped head units to save using a band expander, I’d likely lose those better features to have an oem Unit operational. Better to use a band expander and retain AirPlay options and newer version of head unit     provably best to band expand it, and focus on the nav unit. th isn’t  a big deal/ would be cool to have it working  from what I can tel we use a PAL Signal and Japan uses a NTSC signal  I don’t know if there’s a co better or if the screen only reads NTSC, or if it’s the tv module that needs replacing… no big deal don’t need it but more of a curiosity thing on that!   Thanks for the info re tyre sensors, helpful and great to know.  I was reading the online manual off Japan website and it seemed to make it sound more confusing than it is  I guess a rim replacement would require the sensors to be moved to a new rim to carry that option over?!     Thanks for the info regarding diagnostic mode. I appreciate your help mate. Trying to brainstorm here to find a solution to get as much gadgets as I can working! I plan to get my local Nissan tech to have a look too who used to be at an Infiniti dealer back in the day to see if any thing they have or idea can find a soliton. But hoping anyone here has gone down the same route to make life easier!!   i guess identifying the cable/plug differences and what they do would be a great way of finding out if the units are transferable    thanks again 
    • No idea about the remote start part. If the V37 nav is anything like other Nissan JDM vehicles, you can't get the factory Japanese nav working in australia, a card from a different car almost certainly won't work, those cards are usually matched to the serial number of the DCU.  You could be possibly swap out the components from a AuDM Q50 to get it working, but if this is a new model (2021+) 400R, then you will lose the newer features like ACP/AA.  That said, if you have ACP/AA, just use google maps.. I assume a band expander would be required to get the local radio stations, but don't forget the Japanese FM band is narrower than ours, so you still might not be able to receive all Australian stations. I can't see any reason the tyre pressure sensors won't work here, there is the sensor unit inside the rim and the receiver nearby in the wheel well.  I have never had to change the batteries on my 2015 Q50, so I assume they last quite a while.  A straight battery change shouldn't need them to be re-registered as they are the same unit, that should only be required if you replace a sensor with a new one.   Word of warning, if you ever go into the 'secret' diagnostics mode on the main screen, DO NOT EVER do a 'reset' in this menu, it will erase all of your model specific data in the DCU and you will need a trip to a dealer to re-program it all, which would be particularly painful being an import.  This applies to the AuDM Q50 too.
    • There is a known issue with the mix door motor on the Q50 which causes these symptoms, not sure if it is common on the Y51 though.
    • That ring thing is interesting how it's holding everything together 
×
×
  • Create New...