Subaru Questions. Options

[pploco]

The USDM STI 2.5 has the best of both worlds - low end grunt and high rev.

[Literati914]

The USDM STI 2.5 has the best of both worlds - low end grunt and high rev.

Would that be an EJ20 X ?
I see one local with dual ACVS (what’s that?)

[lierofox]

The USDM STI 2.5 has the best of both worlds - low end grunt and high rev.

Would that be an EJ20 X ?
I see one local with dual ACVS (what’s that?)

The 2.5L's are the ones that start with EJ25. For example EJ255 would be a WRX engine, EJ257 is an STI engine.

AVCS is a variable ECU-controlled cam phasing system, adjusting the timing of the camshafts relative to the crankshaft depending on engine RPM, throttle position/load/power demands, etc. Dual AVCS means both the intake and exhaust cams have phasers on them.

[pploco]

AVCS makes a big difference in lower RPM torque. The turbo 2.5 with AVCS is a beast through the entire power curve. You can get the EJ257 in the STIs and Forrester XT.

[partwerks]

AVCS makes a big difference in lower RPM torque. The turbo 2.5 with AVCS is a beast through the entire power curve. You can get the EJ257 in the STIs and Forrester XT.

Is the Forrester XT version of the STI cheaper, but the same thing, sort of like the WRX trans vs Forrester trans?

[partwerks]

AVCS makes a big difference in lower RPM torque. The turbo 2.5 with AVCS is a beast through the entire power curve. You can get the EJ257 in the STIs and Forrester XT.

According to this article, the XT Forrester had the engine, but no, turbo, intercooler, or tune?
https://tuningpro.co/subaru-ej257-engine-pr...y-specs-tuning/

This one is telling a different story?
https://www.flatironstuning.com/blog/what-i...55-and-an-ej257

[VaccaRabite]

@broomhandle

What did you end up doing, if anything?

Zach

[partwerks]

Trans strength isn't a factor. We are 1000 lbs lighter and not AWD, we will never break one.

WRX has the tallest gearing. SUVs have lower 1st & 2nd ratios usually. Final is 4.111 or 3.9 or a 2 MY only 3.7. In reality it's only a few mph difference at redline.

There are a few trans code excel files floating around the net. There have been small improvements over the years, synchros & such, but it's all way better than a 914 box.

The Subaru 6 feels like a Porsche 6, kinda dull on the low end but takes off on the high end. I notice it because my Nissan 6 (Maxima) has more low end torque but dives hard near redline.

So I'm in the -6 camp too. The turbos add a bunch of complications that are only justified if you want V8 speed without the weight.

Was the 3.7 FD, only offered in the years 06-07, in a push style clutch?

[AZBanks]

The EJ251 in my son's 2003 Baja developed rod knock so I replaced it with a used JDM EJ253. Now I have an old EJ251 sitting in my garage taking up space.

When I found out his engine was knocking, I considered doing a rebuild. Rebuild kits run anywhere from around $400 to $1600 with some decent kits around $600. I could have a freshly rebuilt EJ251 for around $1000.

Decisions, decisions. (IMG:style_emoticons/default/confused24.gif)