Jump to content
SAU Community

Recommended Posts

coul dbe simply the way you are using the wideband... i'm assuming right down at the tailpipe? if so make certain you have no exhaust leaks etc. and if it is a stupidly big exhaust you may have accuracy issues anyway.

make sure its calibrated properly too

My method;

Turn ther map trace on the Datalogit on the Injection screen

Watch closely what load cells are being used around the time of the A/F ratio issues

Check the consistency of the values, I have found the odd rouge single cell that isn't obvious until you look at that one cell specifically

You can do the same with the logging, but I find it quicker on the dyno to simply watch what's going on on the screen.

Cheers

Gary

im using the wideband in the stock 02 sensor bung in the dump pipe n it also simulates the narrowband 02 for the ecu.. it pretty mcuh has to be recalibrated everytime i turn the car the car on since it loses calibration every time i turn the car off n just outputs 7.4 over n over.. which can be very frustrating when trying new things..

sydneykid: im a little unclear what you mean, pretty much i log the afr's using datalogit which is plotted N(revvs) Vs P(load) the cells that consitantly play up and differ between the max n mins are the cells that the map tracer follows when the car is coming on boost

i was thinking maybe the 02 sensor is not giving the most accurate readings since its outputting data instantly rather than a avg over a 1/12 sec period... everytime i change it to avg it out it needs to be recalibrated n every time i recalibrate it, it goes back to instant response..

ill add some of the different logged runs when i get the laptop online

There is some knock there.

Have a look at the consistency of your ignition timing around 10/13 and 10/14, there are some anomalies

Have a look at the consistency of your injection around 12/14, there are some anomalies there as well.

Does it misfire when it knocks?

Cheers

Gary

have had a fair bit of knockin but never heard it misfire, i had my own tune i done myself from scratch n had the varying afr issue making it hard to tune past 12psi... then i took it to a performance shop n they started from scratch and got it upto 9 psi and said it has a fuel issue.. they wouldnt change any settings n every run the afr line would be completely different.. and their map is a hell of alot richer n retarded than mine n still has the same sort of problems at the same spots.. i can upload both maps if you would like?

so has anyone else got any other ideas that could cause the afr's to vary so much? could it be the standard coil packs or the iriway7's im running?

U need to check things that affect AFR's (fuel and AIR)

Im guessin if ur fuel pressure is ok it must be a vac or boost leak somewhere.

Regards

Trev

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

    • Yeah i found that alot of parts can be wrong or "very" hard to get the real right one. I already bought some brakes years ago on me "old" GT calipers and they were wrong too 😄  I told them too. Even send them pictures...but they said "EBC catalogue has them on my car... So i dont know what their answer will be. I call monday them and let them know that they are really not on my car. If they were they would be already on a car...
    • Welcome to Skyline ownership. Yes, it is entirely possible parts websites get things wrong. There's a whole world of inaccuracies out there when it comes to R34 stuff (and probably 33 and 32). Lots of things that are 'just bolt on, entirely interchangable' aren't. Even between S1 and S2 R34's. Yes they have a GTT item supposedly being 296mm. This is incorrect. I would call whoever you got them from and return them and let them know the GTT actually uses 310mm rotors. Depending on where you got them from your experience and success will obviously vary.
    • Hi...a bit a "development" on the brakes. I spoke to the guys where i get brakes from...and they are saying that 296mm EBC are for R34 GT-T. I then went to their site: https://www.ebcbrakes.com/vehicle/uk-row/NISSAN/Skyline (R34)/ and search for my car(R34 GT 1998 - it has GTT brakes) and it show me this USR1229 number and they are rly 296mm rotors... So now iam rly confused... The rotors i have now on the car are 310mm asi shown... So where is the problem? Does the whole EBC got it wrong or my calipers are just...idk know what?  
    • Oh What the hell, I used to get a "are you sure you want to reply, this thread is XX months old" message. Maybe a software update remove that. My bad.
    • This is a recipe for disaster* Note: Disaster is relative. The thing that often gets lost in threads like this is what is considered acceptable poke and compromise between what one person considers 'good' looks and what someone else does. The quoted specs would sit absurdly outside the guards with the spacers mentioned and need  REALLY thin tyres and a LOT of camber AND rolling the guards to fit. Some people love this. Some people consider this a ruined car. One thing is for certain though, rolling the guards is pretty much mandatory for any 'good' fitment (of either variety). It is often the difference between any fitment remotely close to the guards. "Not to mention the rears were like a mm from hitting the coilovers." I have a question though - This spec is VERY close to what I was planning to buy relative to the inboard suspension - I have an offset measuring tool on the way to confirm it. When you say "like a mm" do you mean literally 1mm? Or 2mm? Cause that's enough clearance for me in the rear :p I actually found the more limiting factor ISNT the coilover but the actual suspension arms. Did you take a look at how close those were?
×
×
  • Create New...