Wasted Potential

Quoted $1699 + $130 shipping from Heuberger. If I had the free flowing cash I would let it sit!

Do you ever question if you would have preferred a 16g over the VF52?

Max Capacity, I remember being concerned about the EJ255 OR EJ257 short block. I just received an email from an employee at Heuberger Subaru and he stated that the Legacy GT is in fact the EJ257 for (at least for my VIN) '05 LGT Wagon. Utilizing different "pistons, rods, and nitride crankshaft" compared to the EJ255.

Part #10103AC870

Are you aware if the EJ257 has longer piston skirts than the EJ255?

Have you had any return or occurrence of piston slap at cold temperatures?

I believe I heard some distributors of the OEM block selling ones without nitrided crankshafts with only heat treated units?

Are you aware if the EJ257 is forged pistons?

Within his first post in this article there is the list of mods, under tuning, it states "closed/open loop delay..."

I think it is purely an ECU controlling injector duty cycle to control AFR at WOT to limit emissions, then alternate systems come in to play to limit detonation. (I THINK, I DO NOT KNOW THIS)

Edit: Here is a post of his.

Late to the party, but wanted to add a couple more data points. I did a slightly warm compression test on my car the other week (engine was probably around 100F). 140k miles, 100% Stock with stock tune up to 100k miles, Stage 2 with diy tune since 105k miles.

1 = 135psi, 3 = 132psi, 2 = 125psi, 4 = 130psi

 

I'm at 1,300ft elevation.

 

As for stock tune causing burned valves, all USDM Subaru's have what's called a Closed Loop to Open Loop delay, ECU basically keeps in closed loop fueling while you floor it, causing major leaness. It's not as dangerous on NA Subarus as it is on Turbo one's though, here is why:

http://legacygt.com/forums/attachment.php?attachmentid=258216&stc=1&d=1510676384

 

Redline shows stock tune, I'm at full boost at ~3.3k rpm but my AFR's stay above 13:1 until almost 5k RPM. Normally by 10psi you want your AFR's to be at 11.1:1 on turbo Subarus to reduce detonation. Don't mind the power up tick at the end, that's a virtual dyno anomaly.

 

Notice I said all USDM, JDM versions of the same cars have code and tables for closed loop delay, but the values are zeroed from the factory! Which means this was a US market only fix (probably for emissions).

It's almost as easy as a simple "disable" thing.

In the ROM (tune) there's a table that defines the pump's duty cycle at "low" or "medium" levels, and you can change the duty cycle in each field ("high" duty cycle is always 100% and can't be changed). Stock (for my '05 GT) "low" = 33.3% and "medium" = 66.7%.

I meant the open/closed cycle in relation to under boost at WOT, how our vehicles tend to run lean at these conditions.

I have head issues with the Dw65C pumps, maybe this was just older units? I though they are replaced by a dw300 or similar? I do have a preference to walboro or aem, but have only used walboro for other mustangs

In regards to the fitting, when I pulled my sending unit (not knowing any better), I was rather rough with all movements and processes. Interesting to think about how much one learns after doing something once. I will be more gingerly with it next time haha.

So there is no bolt in replacement pump for our vehicles, they all need some form of tuning?

I was looking back at the graphs you posted, and your first post in this thread.

Do many tuners disable the close/open cycle, not sure if it's a simple "disable" sort of thing, or requires complete fuel table modifications?

I have only had one of my vehicles on a dyno before and never really saw what is dealt with. I'm assuming at WOT, fuel tables are edited and the computer delineates that to alternate throttle angles, so in essence, there is only one table needing adjustment?

I presume you utilize an open source form?

After replacing my sending unit I noticed no cracks. I did notice a rip in the gasket. Did nkt expect the gasket and mounting points to vibrate enough for that to happen...

If I could have redone it, I would have bought a higher flow fuel pump while the unit was new and had no fuel in it!

Any update? I sent you an email and am curious to see if I can obtain a kit with the bolt together setup.

Thanks!