Learning View Snapshots \ Discussions

[tom_kauf]

Can I get my LV analysed, please. I noticed IAM had dropped below 1 last week, after I got my car back from the dealer. Below is tonight's screenshot (before I started the car), and I could swear the amount of blue FLKC fields have gone up. Apart from those and the IAM, it seems ok - very little knock as far as I can tell.

I was going to install a 3Port Boost Solenoid last week (I have the tune ready), but haven’t because I’ve been waiting for IAM to return to 1. Still hasn't returned, but the car has only been driven short 10-30km trips morning & afternoon all week (maybe total of only 180km). My gf has mainly been driving, and she doesn’t drive hard. And apart from one day last week when I first got my clutch and did a few launches and hard pulls, even I’ve just been cruising the rest of the time.

Nothing has changed on the car in terms of tuning/engine lately. Just a Dump Pipe earlier in the year, which Matt/KiDo fine-tuned locally in Mar/April.
But the car just got back from being at the dealer for almost 5 weeks, waiting for me to get back home and waiting for a Jim Berry Clutch. Things that were done were Clutch, Centre Diff, STi Transmission Mount (not the hard GroupN one, but the softer one), and Trans reverse switch.

Fuel was almost empty last week, so I got a fresh tank of BP Ultimate - so fuel isn't old.

[dr20t]

You're engine had a substantial knock event that did not go away with some timing being pulled by feedback knock mechanism, nor by fine learning knock correction in those load ranges, so went into rough correction and refuced your entire timing table through Iam reduction.

It is now learning back (thus the blue, positive fine learning knock correction).

Maybe a bad batch of fuel or some other foreign object that caused the knock which is no longer present

[tom_kauf]

You're engine had a substantial knock event that did not go away with some timing being pulled by feedback knock mechanism, nor by fine learning knock correction in those load ranges, so went into rough correction and refuced your entire timing table through Iam reduction.

It is now learning back (thus the blue, positive fine learning knock correction).

Maybe a bad batch of fuel or some other foreign object that caused the knock which is no longer present

Thanks Mick,
Yeah, we'll see how the next batch of fuel goes.

The only thing that's consistently different with the recent new parts listed above, are the vibrations transmitted through the whole drivetrain and car, if driving in a gear that's too low. I dunno if that could be seen as a false knock?....

Because I have a bad habit of cruising along in 6th, even at 60/70kmh. That's fine when just maintaining speed, but not when the speed has dropped by eg 5km/h around a small roundabout and I don't change into a higher gear to pick up that bit of speed again. I know the engine is far from optimal revs, but the old trans mount must've absorbed most of that - it used to be barely noticeable. Now, a LOT of vibrations are transmitted through the whole drivetrain and car.
Either way, I should just stop being lazy and just shift into 4th/5th where needed, to get to normal RPMs and no vibrations . Which is ironic, because I love rowing through the gears on a spirited drive along a winding road - maybe I'm just sometimes in 'get-home autopilot' city driving mode .

[Shaheenis]

Tom the vibrations aren't pinging, they will be directly related to your gearbox mount. Pinging (assuming your can hear it) is usually a highish frequency rattle coming from the engine under load.

I have the GroupN mount sitting beside me and it is an STI part number so don't be surprised if the one you have is actually the Group-N variant. PM me the part number if you have it. Matt (Kido) warned me of the NVH resulting from this mod. Hopefully there are some noticeable improvements to gearbox slop on gear changes to make it worthwhile.

[tom_kauf]

Thanks Tim. Yeah, the vibrations are definitely not knock. Was just wondering if something like that can be picked up as a false knock. But I guess it's not similar enough (not like a rattle of something lose eg in the engine bay).

Yes, the Trans mount is an STi part (was in an STi box with STi part label). And like you, my research found that the GroupN mount produces far too much NVH for what I'm after (keeping it a comfortable daily). But Japan Parts sells 2 STi trans mounts. The GroupN one being the harder one. The other one's description says something like 'Less firm than xxxPart#, in between Stock and GroupN.' I don't think I have the Part# anymore, but there was a lot of confusion on other forums, because the Part# on the box seemed to be the same for both. Apparently the markings on the rubber are what is different. I copied that link somewhere if you're interested.
In the end the people said it was clear which was which, by pressing down on the rubber. The stock one has big holes in the centre (pretty flexible). The medium and groupN ones are both solid. But the groupN one is rock hard (rubber can't be pushed in much with eg the fingernail). The medium one is softer (hard to describe but maybe similar to the dash material).
I never had the GroupN one in my hands, only my mid-firmness one. Maybe you can confirm the hardness of yours? That's be cool to confirm.

I have no NVH increase over stock (apart from the shuddering when in far too low a gear). But none over stock for all normal driving - and I'm usually very picky about that, so I'd notice if there was.

[2jz929]

Tell me what's going on.

[dr20t]

Someone's at the door.

[oldmate]

Someone's at the door.

American gothic reference? ?

[2jz929]

Figured as much, that was from when I tried it without the wastegate hooked up. What about the airflow corrections?

Mind talking a look in the 2.0gt section at my boost issue?

[KiDo_Tuning]

That noise is the WGDC dropping off to stop boost creep IF it was a 15psi supplied spring Explains why boost falls away as per boost thread

[dr20t]

That noise is the WGDC dropping off to stop boost creep IF it was a 15psi supplied spring Explains why boost falls away as per boost thread

Matt - dont quite understand what you mean. Can you please explain?

[KiDo_Tuning]

That noise is the WGDC dropping off to stop boost creep IF it was a 15psi supplied spring Explains why boost falls away as per boost thread

Matt - dont quite understand what you mean. Can you please explain?

Target 17psi, run low WGDC(see his other thread about low boost) in case it was a 15psi spring when it was being sent with 8psi. WGDC tapers off at peak torque

He tested it with WG nipple disconnected hence the noise as the ECU sees boost increasing and WG flap opening there(I already seen logs, not a LV)

As always, LV is a snap shot, not a true indicator

[dr20t]

Ahhh ok. Yep makes sense now didnt get what the 15psi spring had to do with it if it was setup of that to begin with. But agree with that diagnosis.

[HighTech RedNeck]

finally got my hands on a laptop after the charger on the old one packed it.

i'm still learning how to read LV but I know red isn't good. anyone walk me threw what my screen shot means

[alexeiwoody]

You most likely have a boost leak, vac line off somewhere (maxxed out correction at idle, unless you're tuned to allow for more correction than 15), or an extremely dirty maf, and your knock sensor is picking up a whole lot of noise, mostly in high revs under heavy engine load. You'll probably notice your car is shitty on take off, if you do have a leak.

Doesn't look like serious engine knock ( yet), but I'd get the car tuned ASAP if it hadn't been tuned already. If it has, speak with your tuner.