Subaru health check day in Collingwood...

Re: Subaru health check day in Collingwood...

Postby bigBADbenny » Sat Apr 03, 2021 12:31 pm

Today’s health check basket case pulled out, my car is fixed (bov gasket) so I’m heading home to do domestic items: pm me if you’re still keen for today :)
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Re: Subaru health check day in Collingwood...

Postby bigBADbenny » Sat Apr 03, 2021 4:41 pm

And then Kimmo turned up!

Yeah so Kimmo’s car appears to have a stock tune, but PW tmic & 3port.

We inlet pressure tested it (C & D range negative fuel trims) and cleaned the maf.

We found:
tiny leak at the bov return, easy fix by tightening the return flange.

As the maf screws were undone, the maf rose in the airbox mount.

This is a sure sign the maf oring isn’t seated properly and or the oring is pinched.

Indeed it was both items.

I cleaned the maf with crc maf cleaner and offered a new oring, but Kimmo is a hose pro with a van full of these things and reseated it properly like the pro he is: done and dunzo.

He already has Btssm in his dash, so he’s just going to re-check his LV at the end of the week.
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Re: Subaru health check day in Collingwood...

Postby bigBADbenny » Sat Apr 03, 2021 4:45 pm

So I guess I’d have to ask a tune pro:
Kimmo’s LV has stock rpm ranges in the fine learning table.
But it has a pw tmic, 50/50 bov and three port...

Fuel learning ranges C & D were less than 5% eg outside the comfort zone but with no significant boost leaks...

Would the car “have” to have been tuned to run the three port at all?
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Re: Subaru health check day in Collingwood...

Postby Kimmo » Sat Apr 03, 2021 4:58 pm

Yeah, it's mysterious...

Getting a bit closer to being able to afford a set of Shockworks, so I hopped in Bennie's whip for a ride. First thing I noticed, they didn't seem much softer than my BCs; you could feel the texture of the road. They're communicative, but not intrusive; rolling over bluestone patches is fuss-free. Ben threw it at some speed bumps, and I was like whoah, but somehow there was no crashing and banging and bouncing your head off the roof like that speed would've meant in mine.

I'm impressed - they feel nice and sporty, but they're not at all stupid. Ben tells me his are a bit tired, and there's been development since his were new too, so I'm pretty damn keen to take the remaining stupid out of my car.

(Already ditched a mile of excess wiring, including an old bluetooth module - it had just been left there when the Grom was installed... and replaced the factory sub, ditching the aftermarket one. I did add some stupid myself though; a crappy Ultrex strut brace which didn't clear the PW IC, which i had to unmount and pull forward with zipties, bit of a hack.)
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Re: Subaru health check day in Collingwood...

Postby bigBADbenny » Sun Apr 04, 2021 8:37 am

You’d get a better idea with a taxi ride in Nish, Leon, Alexei, James or Jeremy’s cars that all run recent Shockworks revisions.

As Chris says in the video on Shockworks tech, the damper stack doesn’t effectively wear out with use, its more preventative maintenance regarding seals etc that’s required with km to keep the dampers in tip top shape :)

My car has the damping set very soft, for daily use and grand touring.
Damper force increases around 20% with each click of the adjuster, the effect being that the car will “follow the road” to a greater extent.

Another important feature is internal bumpstops, these really prevent harsh bottoming out on extreme bumps & potholes.

They simply unleash the cars useable envelope!
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Re: Subaru health check day in Collingwood...

Postby bigBADbenny » Mon Apr 05, 2021 10:20 am

Car is much happier, seems this rushed bov gasket fix was causing some issues in my logs n LV’s prior to it fully letting go.

#1 symptom: rev hang coming to a stop.
Rpm would hang around 1500 till the car came to a halt.

That’s now largely gone. :good:

It seems even tiny inlet tract/crankcase leaks can negatively affect tune, economy etc, even if the car still “feels” ok.
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Re: Subaru health check day in Collingwood...

Postby MadmanSean » Sun Apr 11, 2021 10:27 pm

bigBADbenny wrote:So I guess I’d have to ask a tune pro:
Kimmo’s LV has stock rpm ranges in the fine learning table.
But it has a pw tmic, 50/50 bov and three port...

Fuel learning ranges C & D were less than 5% eg outside the comfort zone but with no significant boost leaks...

Would the car “have” to have been tuned to run the three port at all?


IMO 2 port (Subaru Bleed off method with restrictor pill) switching to 3 port boost control (Mac valve) definitely requires a retune.

Differences:
2 port method/implementation:
2 port BCS.JPG
2 Port BCS Setup
2 port BCS.JPG (96.41 KiB) Viewed 24 times

3 port implementation:
3 port BCS.JPG
3 Port BCS
3 port BCS.JPG (40.49 KiB) Viewed 24 times

3 port essentially effects a couple of main area's:

1) Turbo Spool Up - Without adjusting the WG duty tables there is a potential to overshoot the target boost and as such pop the head gasket's with too much cylinder pressure.

2) Target boost stability - i.e. once spool up to target boost occurs the 3 port allows for greater control of boost up to redline, without adjusting and tuning for the 3 port all sorts of surging and spiking can occur.

Target boost is a PID controlled feedback loop all of this needs to be adjusted within the tune to ensure that the turbo is being controlled safely.

AFR learning values will show minimal adjustments after the 3 port has been fitted without a tune because the target boost level has not been raised therefore the OL fueling table will be relatively close. Generally when switching to a 3 port the main reason is to have better control of the wastegate to then increase peak boost level's. Stock wastegate spring is 9psi in a Gen4 Lib so we can increase to roughly 17psi while keeping decent control over the turbo with only having changed to a 3 port BCS method.

I mentioned to Kimmo at the health check day that its worth logging target boost in I / S / S# as this will be a better indication as to whether or not the car is tuned, if it's tuned it will most likely be targeting higher boost than the stock level of 14.5psi in S#.

Happy Logging 8)
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Re: Subaru health check day in Collingwood...

Postby bigBADbenny » Mon Apr 12, 2021 6:43 am

Awesome thanks for the explanation, most appreciated!

Gotta link that to the tune faq.

I’ll see if I can get Kimmo to cough up a log, plus an updated LV post inlet fixes :good:
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