2015 Forester 2.0

[richard_crl032]

@Stratovarius 

Hi Strato, Seems to keep/log peak value from previous drive .. now at 1.0.

Dun really know what all these mean but noticed about -0.5 during idling until accelerating which brings it to about 0 and when accelerating harder it goes to noted 0.6 and now seems stuck at 1.0.

Does previous 0.6 and now 1.0 matters and/or what should it be for fxt ? 🤔🤔

As declared .. only likes to mod albeit not into performance ones nor know much on this turbo thingy 🤒🙏🙏

For your teaching and TIA.

Cheers.

Edited February 4, 2023 by richard_crl032

[5ub23r0]

@richard_crl032 that's the intake manifold pressure (or boost pressure as many will refer to). On stock fxt usually the pressure will read between -0.8 to -0.6 (x100kpa) but this value will change to -0.5 or even down to 0.3 depending on the mods that you do to it, such as cold air intake, higher flow intercooler, charge pipe, turbo inlet, turbo etc.... easier airflow = less restriction on engine pulling in air to the manifold.

the negative value denotes the air pressure inside the manifold is in vacuum state, as the movement of the pistons are actually pulling the air in. As you press on the throttle, more exhaust gas will be produced, spooling the turbo, which will then charge the air pressure to a positive state. 

the stock turbo is rated to be pushing 1.2 bar at its peak but i've seen 1.3 on rare occasions. the red line you see is the max boost achieved (either on previous drive or historically, i can't remember correctly) 

[richard_crl032]

28 minutes ago, 5ub23r0 said:

@richard_crl032 the stock turbo is rated to be pushing 1.2 bar at its peak but i've seen 1.3 on rare occasions. the red line you see is the max boost achieved (either on previous drive or historically, i can't remember correctly) 

@5ub23r0Tks tks .. understand your clear and concise teaching liao. 

Yes, I dun drive hard and may not see 1.2 peak then and yes, historical as it nvr change unless you exceed previous peak it seems.

Lowest I had seen is -0.6+ at idling and nvr -0.7 or -0.8 on my stock untuned fxt .. not sure if due to upgraded metal charge pipe, turbo intake pipe/box recommended by kor kor Keong at BKS as well as brand new lower block at 10k km.

Cheers

Edited February 4, 2023 by richard_crl032

[Stratovarius]

On 2/4/2023 at 4:40 PM, richard_crl032 said:

@Stratovarius 

Hi Strato, Seems to keep/log peak value from previous drive .. now at 1.0.

Dun really know what all these mean but noticed about -0.5 during idling until accelerating which brings it to about 0 and when accelerating harder it goes to noted 0.6 and now seems stuck at 1.0.

Does previous 0.6 and now 1.0 matters and/or what should it be for fxt ? 🤔🤔

As declared .. only likes to mod albeit not into performance ones nor know much on this turbo thingy 🤒🙏🙏

For your teaching and TIA.

Cheers.

That's the air pressure gauge. For tc cars we usually call it the boost gauge. Minus 5 during idling is normal. Stock fxt boost is soft limited to 1.2 or 1.25, can't really remember. If engine is tuned, the tuner will increase the soft limit to around 1.35. 

Don't not unlock the limit so it goes all the way to 1.5bar until you have changed all the clamps to aftermarket ones. 

1.0 is definitely on the low side. The readings might have reset when you change the UI. It happened to me after I send for servicing in mi. It will increase after you slammed the gas. if after slamming still 1 bar, there might be a leak somewhere.

[richard_crl032]

@Stratovarius Tks tks .. no slam no slam ... read 5-6+ rpm to max out to indeed stock 1.35 limit and I dun think I went beyond 4k rpm since fitted the new mfd ☺. Tks again for the sharing 🙏🙏

[richard_crl032]

On 2/5/2023 at 7:24 PM, Stratovarius said:

1.0 is definitely on the low side. The readings might have reset when you change the UI. It happened to me after I send for servicing in mi. It will increase after you slammed the gas. if after slamming still 1 bar, there might be a leak somewhere.

Now at 1.23 after 1-2 second S+ to perhaps 4k rpm to get fast into lane#1 this morning .. seems turbo working fine with no leak then 🥳😅

 

 

[richard_crl032]

On 4/15/2020 at 10:45 AM, Cashgoh said:

Hi all, need some expert opinion. I have gotten wrx rear sway bar (yet to be install), was thinking if front sway bar and endlink should be upgraded in order have in on the optimal state?

Hi Goh,

Not sure if you are still with forester and looking to spend a bit for reportedly better ride but just gotten while had not installed the curved end links from forester ts that I was previously not aware of:

https://minkara.carview.co.jp/userid/592507/car/2025767/11773430/parts.aspx

34161AL010 and 34161AL000

Cheers.

 

[richard_crl032]

Swift springs 4F913 listed here while not sure if indeed still available:

https://coilovers.com/products/2014-2020-subaru-forester-swift-sport-springs-swift-springs

https://www.dirtyracingproducts.com/products/swift-springs-sport-lowering-springs-subaru-forester-2014-sjg

Cheers.

 

 

Edited February 24, 2023 by richard_crl032

[richard_crl032]

Not sure if there are other avenues for our forester sj part list and hope below are useful for bros there:

https://www.amayama.com/en/catalogs/subaru/forester/4-suv-right-sj-2015-r-1916

https://subaru.epc-data.com/forester/

Just managed to find original black gear cover that had discolored and scratched up and do not have to resort to inferior wrap or tiong carbon paste over panel 🥳🥳

35180SG001

[Cashgoh]

@richard_crl032 Yes still with forester SJ. Have you manage to get it and install?

[richard_crl032]

On 2/27/2023 at 9:24 PM, Cashgoh said:

@richard_crl032 Yes still with forester SJ. Have you manage to get it and install?

🥳🥳👍👍Not yet .. several items to consolidate and just ordered the abovementioned gear cover replacement. 

Cheers.

[richard_crl032]

Looking back on my experience with our dear DIT equipped forester sjg xt turbo, walnut blasting is unavoidable for our forester sjg turbo even with IAG AOS and a bit of history to share here:

- New in Oct 2017

- IAG AOS fitted in Jun 2018 at 20k km

- Preventive Walnut blasting in Oct 2020 at 80k km

- 100% Octane 98 petrol throughout

- Motul 300V svc every 7-8k km

Conclusion from enclosed photos:
- Even expensive and complicated coolant cooled AOS does not help prevent carbon built up on valves ... believe catch cans will fair worse without cooling

- Engine was running fine without issues but do not believe running efficiently and I certainly wish for carbon free valves

- Walnut blasting is compulsory for clean valves and I will have to do so every 30-40k km before carbon clogged valves related issues occurs 😭

Hope this helps forester sjg xt  and other DIT engine car owners

PS: Find a reliable Walnut Blasting shop .. heard that it can cause issues if not properly executed but not sure what are possible issues

Edited March 13, 2023 by richard_crl032

[5ub23r0]

@richard_crl032 walnut blasting not done correct will do some harm to the engine yep!

wah IAG AOS, was looking into this but decided on another unit as I didn't want to deal with the coolant lines haha.

Carbon build-up/deposit is unavoidable due to the nature of Direct Injection. AOS will help a little in alleviating this issue by cleaning the air/oil mixture from the PCV valve/system but the other contributor to carbon build-up/deposit is the EGR system. During cold cycle and start/stop traffic the uncombusted fuel in the exhaust is recirculated back into the manifold to 2nd combustion. It's a system that helps with emmisions and cleaner at the expense of engine internals in the long run. You can circumnavigate by blocking off the EGR valves, which in turn will reduce, almost eliminate carbon build up since you have the AOS, plus, removing EGR could lower your intake manifold temps, further helping in performance; but; EGR removal does require an engine tune. As for will it affect emmissions test or not during inspection, i have no answer for you.... I'll know this May when i go for inspection haha.

[richard_crl032]

On 3/13/2023 at 10:09 AM, 5ub23r0 said:

@richard_crl032 walnut blasting not done correct will do some harm to the engine yep!

wah IAG AOS, was looking into this but decided on another unit as I didn't want to deal with the coolant lines haha.

Carbon build-up/deposit is unavoidable due to the nature of Direct Injection. AOS will help a little in alleviating this issue by cleaning the air/oil mixture from the PCV valve/system but the other contributor to carbon build-up/deposit is the EGR system. During cold cycle and start/stop traffic the uncombusted fuel in the exhaust is recirculated back into the manifold to 2nd combustion. It's a system that helps with emmisions and cleaner at the expense of engine internals in the long run. You can circumnavigate by blocking off the EGR valves, which in turn will reduce, almost eliminate carbon build up since you have the AOS, plus, removing EGR could lower your intake manifold temps, further helping in performance; but; EGR removal does require an engine tune. As for will it affect emmissions test or not during inspection, i have no answer for you.... I'll know this May when i go for inspection haha.

Tks tks !  Pls keep me/us updated on EGR delete at inspection 🙏🙏

[inlinesix]

On 3/13/2023 at 10:09 AM, 5ub23r0 said:

@richard_crl032 walnut blasting not done correct will do some harm to the engine yep!

wah IAG AOS, was looking into this but decided on another unit as I didn't want to deal with the coolant lines haha.

Carbon build-up/deposit is unavoidable due to the nature of Direct Injection. AOS will help a little in alleviating this issue by cleaning the air/oil mixture from the PCV valve/system but the other contributor to carbon build-up/deposit is the EGR system. During cold cycle and start/stop traffic the uncombusted fuel in the exhaust is recirculated back into the manifold to 2nd combustion. It's a system that helps with emmisions and cleaner at the expense of engine internals in the long run. You can circumnavigate by blocking off the EGR valves, which in turn will reduce, almost eliminate carbon build up since you have the AOS, plus, removing EGR could lower your intake manifold temps, further helping in performance; but; EGR removal does require an engine tune. As for will it affect emmissions test or not during inspection, i have no answer for you.... I'll know this May when i go for inspection haha.

With EGR delete, NOX in exos will be higher.  The chances of fail inspection is high.

In addition, there will be build-up of soots at exos tip.  

 

[Tohto]

Hi Richard, did you see any increase in FC or lost of power before your walnut flushing?

My ride will be 7yrs next month, power delivery is still as smooth as new and FC remain stable as new. 

Occasional hard stomp onto accelerator when entering expressway or overtaking still felt as good.

EO change is on schedule with Castrol Edge 5W30 since 3rd service till now. Current mileage 175k.

Petrol the 1st 5yrs 100% 98 either Esso or SPC.

Past 2 yrs due to high petrol price, use between 95 & 98 (3 to 1 tank ratio).

[richard_crl032]

On 3/13/2023 at 1:24 PM, Tohto said:

Hi Richard, did you see any increase in FC or lost of power before your walnut flushing?

My ride will be 7yrs next month, power delivery is still as smooth as new and FC remain stable as new. 

Occasional hard stomp onto accelerator when entering expressway or overtaking still felt as good.

EO change is on schedule with Castrol Edge 5W30 since 3rd service till now. Current mileage 175k.

Petrol the 1st 5yrs 100% 98 either Esso or SPC.

Past 2 yrs due to high petrol price, use between 95 & 98 (3 to 1 tank ratio).

Hi Tohto,

No observed increase in FC and certainly no power loss before walnut blasting but trouble with reading more is that backside starts to itches.

In this case, I am glad to found out about walnut blasting cos the photos shows how carbon builds up despite coolant cooled IAG AOS and it cannot be good for performance and driveability .. call it preventive if you may. Engine does seems smoothly and quieter after walnut blasting with zero issue makes it attractive for me to do so again every 40k km max.

Using Octane 95 is indeed sensible per recommended by Subaru but I had always do with Octane 98 and a bit reluctant to change .. it does not help that mine is a bit heavy with all the soundproofing done together with ICE installation and Octane 95 loses a bit of grunt 😒

Read more of this EGR delete which I understand needs retuning and I will pass then .. no plan to do retuning unless backside itches again and failing inspection or legality is not an option 😌

Point in my original post is the AOS and certainly catch cans do not seems to eradicate this carbon builtup seen except mentioned delete EGR that I have no experience on .. I do recommend walnut blasting for your case since not done so by a capable workshop since already 175k km and do have photos of the valves taken before and after to feel good after $ spent 😂

Cheers.

PS: I am always with 5W40 motul 300v in hope for quieter engine with thicker eo and believe it also help in our hot climate and turbo charged engine

Edited March 13, 2023 by richard_crl032

[inlinesix]

On 3/13/2023 at 3:08 PM, richard_crl032 said:

Hi Tohto,

No observed increase in FC and certainly no power loss but trouble with reading more is that backside starts to itch.

In the case, I am glad to found out about walnut blasting cos the photos shows how carbon buildsnup and it cannot be good for performance and driveability .. call it preventive if you may.

Using Octane 95 is indeed sensible per recommended by Subaru but I had always do with Octane 98 and a bit reluctant to change .. it does not help that mine is a bit heavy with all the soundproofing done together wirh ICE installation and Octane 95 loses a bit of grunt 😒

Read more of this EGR delete which I understand need retuning and I will pass then .. no plan to do retuning unless backside itches again and failing inspection or legality is not an option 😌

Cheers.

WIth EGR delete, NOX in exos in exhaust will increase.  Not sure whether need to retune for petrol engine.

MY fren diesel pickup did NOX delete.  No retune done.

It restore the power and torque of a 10 year old pickup.

The only downside is soots in exos during cold startup.

It is a 15 mins job to remove the pipe and cover it up.