Jump to content
SAU Community

Recommended Posts

Can the HKS take over O2 correction, using the factory fuel target table (because FCon won't let you enter a target table), with either a wideband or narrowband feedback?

You can set target AFR's with the Fcon and use the wideband input/parameters for O2 correction.

Won't stop the too rich/lean CELs though as the ecu will still receive the signal and crack the sads (not that it will affect the Fcon tune).

Ryan, if the light bothers you that much, remove the bulb and just buy a Cipher cable to check for CELs periodically.

Ryan, if the light bothers you that much, remove the bulb and just buy a Cipher cable to check for CELs periodically.

You want to see 'crack the shits' when he cuts the CEL signal wire. lol.

Take the bulb out and bypass it with a resistor. ;)

Because simply, its the best way for it to run in low load/idle areas of the map. Hot day, cold day, freezing - doesn't matter. Altitude - doesn't matter. It just corrects.

I would like to see what O2 functions the FCon has, and if they are useful. Thats all.

Meh, some scattered self tuning functions from what I have seen, not worth going down that route imo, it's mainly for dumb arse tuners to hack a tune out with before fine tuning from there.

Mine has bugger all dramas with different temps, as the tuner has set up the coolant temp and intake temp corrections fairly well. It is running a bit rich atm but that's due to me being a compulsive modifier, not the tune. ;)

Once set it shouldn't need o2 correction. I haven't run it for years.

You can do correction based on wideband in the fcon, might be worth trying just to see if it clears the code.

I don't see the issue Scotty. So you trust a 10 year old O2 sensor but not a brand new wideband?

And I thought F-Con was supposed to be the bees-knees with no CEL issues...(thought I read that somewhere a year ago).

I hope you get it where you are comfortable driving it around Ryan, CEL or not. Persistance is the key; and if you do find a good solution (with no CEL) you will be a forum hero ;) .

You can set target AFR's with the Fcon and use the wideband input/parameters for O2 correction.

Won't stop the too rich/lean CELs though as the ecu will still receive the signal and crack the sads (not that it will affect the Fcon tune).

I wonder how close the O2 correction on the F-con would be to stock ECU correction? As in, would the ECU see something good/close enough?

Ryan, if the light bothers you that much, remove the bulb and just buy a Cipher cable to check for CELs periodically.

I'll probably end up with the Cipher cable in the new year anyway, easier to sort out than a code reader and more versatile. I just don't want the light firing and masking another issue.

Because simply, its the best way for it to run in low load/idle areas of the map. Hot day, cold day, freezing - doesn't matter. Altitude - doesn't matter. It just corrects.

I would like to see what O2 functions the FCon has, and if they are useful. Thats all.

Target AFR seems to be useful, and easy to implement (which I think was what Scotty was talking about in a backhanded kind of way :P). Whether it'll replicate the stock ECU in the same kind of way I don't know, but I doubt it.

And I thought F-Con was supposed to be the bees-knees with no CEL issues...(thought I read that somewhere a year ago).

I hope you get it where you are comfortable driving it around Ryan, CEL or not. Persistance is the key; and if you do find a good solution (with no CEL) you will be a forum hero ;) .

Yeah its pretty good Leon, more research to clear random codes is required, but other than that it's good. 8k rev limit is a bit high for my liking, but other than that it's got a fair bit of shove. Be interesting to see what it does on the dyno with Scotty's upgraded spring, holding 15PSI not 7...

I wonder how close the O2 correction on the F-con would be to stock ECU correction? As in, would the ECU see something good/close enough?

Target AFR seems to be useful, and easy to implement (which I think was what Scotty was talking about in a backhanded kind of way :P). Whether it'll replicate the stock ECU in the same kind of way I don't know, but I doubt it.

I think you need to research more about o2 feedback.

The widebands play up constantly and require resetting, recal and the sensors require regular replacement. They are in no way reliable enough to use for auto afr targeting, unless you have some way of proving the sensor is accurate, like running twin sensors through some comparison circuit. It's not something a tuner would like to setup either. (hopefully you already know that from speaking to your tuner.)

The Fcon would try and hold a set AFR, as in 14.7 or whatever you target it to hold. The factory ecu wants to see 14 then 15.5, cycling every few seconds. They are in no way similar. Geddit?

Geddit. I still think there must be some way of looping the signal though...

In other news, actuator turned up today Scott, thanks! Will try and fit tonight.

Mmm it needs to go in to stop the boost spiking. Probably better to just put it in and drive it carefully than let the turbo spike to 20PSI for another couple of weeks. Especially when I'm on holidays and will be using it.

Yeah its pretty good Leon, more research to clear random codes is required, but other than that it's good. 8k rev limit is a bit high for my liking, but other than that it's got a fair bit of shove. Be interesting to see what it does on the dyno with Scotty's upgraded spring, holding 15PSI not 7...

8K a bit high? (understatement much, lol). Is that an easy figure for your tuner to set?

I would think you'd have about 2,500 rpm of 'not a lot happening' with the standard turbo.

8k is the lowest rev limit on an Fcon V-Pro

:O Ok-doky then. I guess that's why it's called the 'Pro'.

Is 8K safe for an unopened VQ25? Or should I say, safe for an extended operating life?

I still hit the limiter thanks to the auto not shifting at wot, soft limit is set at 7k, hard limit is 7,600. I don't know what Cam is on about... possibly a hard cut backup?

8k is the lowest rev limit on an Fcon V-Pro

mine shifts at 7200rpm consistantly dont hit the cut....... not sure what the cut is though might have to try that LOL

Installed the rear sway bar and raised the front by 75mm (thank god.. lol)

Ran out of time to do the front sway bar links, so I'll ask the shop to do whilst they push in the bushes tomorrow.

Got home late thanks to the wonderful folks at Adelaide Metro but still managed to remove the top half of the intake, jack the car up and onto jack stands, remove the front wheels so I can put the good ones back on and drain all the coolant out.

Hopefully I'll get home early tomorrow and get the radiator out. Think there should be more room for the thermostat once the radiator and clutch fan are out.

The coolant thermostat? It's just three bolts, no need to remove the radiator or fan.

With the o2 issue, I seem to remember Jaycar having a kit to combat this very problem. Perhaps you could look into it?

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

    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
    • Hi,  Just joined the forum so I could share my "fix" of this problem. Might be of use to someone. Had the same hunting at idle issue on my V36 with VQ35HR engine after swapping the engine because the original one got overheated.  While changing the engine I made the mistake of cleaning the throttle bodies and tried all the tricks i could find to do a throttle relearn with no luck. Gave in and took it to a shop and they couldn't sort it. Then took it to my local Nissan dealership and they couldn't get it to idle properly. They said I'd need to replace the throttle bodies and the ecu probably costing more than the car is worth. So I had the idea of replacing the carbon I cleaned out with a thin layer of super glue and it's back to normal idle now. Bit rough but saved the car from the wreckers 🤣
    • After my last update, I went ahead with cleaning and restoring the entire fuel system. This included removing the tank and cleaning it with the Beyond Balistics solution, power washing it multiple times, drying it thoroughly, rinsing with IPA, drying again with heat gun and compressed air. Also, cleaning out the lines, fuel rail, and replacing the fuel pump with an OEM-style one. During the cleaning process, I replaced several hoses - including the breather hose on the fuel tank, which turned out to be the cause of the earlier fuel leak. This is what the old fuel filter looked like: Fuel tank before cleaning: Dirty Fuel Tank.mp4   Fuel tank after cleaning (some staining remains): Clean Fuel Tank.mp4 Both the OEM 270cc and new DeatschWerks 550cc injectors were cleaned professionally by a shop. Before reassembling everything, I tested the fuel flow by running the pump output into a container at the fuel filter location - flow looked good. I then fitted the new fuel filter and reassembled the rest of the system. Fuel Flow Test.mp4 Test 1 - 550cc injectors Ran the new fuel pump with its supplied diagonal strainer (different from OEM’s flat strainer) and my 550cc injectors using the same resized-injector map I had successfully used before. At first, it idled roughly and stalled when I applied throttle. Checked the spark plugs and found that they were fouled with carbon (likely from the earlier overly rich running when the injectors were clogged). After cleaning the plugs, the car started fine. However, it would only idle for 30–60 seconds before stalling, and while driving it would feel like a “fuel cut” after a few seconds - though it wouldn’t fully stall. Test 2 – Strainer swap Suspecting the diagonal strainer might not be reaching the tank bottom, I swapped it for the original flat strainer and filled the tank with ~45L of fuel. The issue persisted exactly the same. Test 3 – OEM injectors To eliminate tuning variables, I reinstalled the OEM 270cc injectors and reverted to the original map. Cleaned the spark plugs again just in-case. The stalling and “fuel cut” still remained.   At this stage, I suspect an intermittent power or connection fault at the fuel pump hanger, caused during the cleaning process. This has led me to look into getting Frenchy’s fuel hanger and replacing the unit entirely. TL;DR: Cleaned and restored the fuel system (tank, lines, rail, pump). Tested 550cc injectors with the same resized-injector map as before, but the car stalls at idle and experiences what feels like “fuel cut” after a few seconds of driving. Swapped back to OEM injectors with original map to rule out tuning, but the issue persists. Now suspecting an intermittent power or connection fault at the fuel pump hanger, possibly cause by the cleaning process.  
×
×
  • Create New...