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Old 06-01-2005, 02:40 PM   #1
Jon [in CT]
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Default 2006 Forester XT

When I heard the 2006 Forester XT makes the same peak torque as the 2005 version (235@3600) but was rated 20 hp higher in power, I assumed (along with many others, I think) that Subaru was merely assigning a more realistic power rating and didn't really change much with the engine.

But I was wrong. According an SOA press release:
Quote:
The turbocharged/intercooled 2.5-liter engine in the Forester 2.5 XT Limited gains 20 horsepower for 2006 (now at 230 hp) as a result of a higher compression ratio and redesigned intake and exhaust systems. The pre-catalytic converters have been removed from the exhaust system to decrease backpressure, and a secondary air pump system has been added to reduce emissions. The engine now meets the stricter Tier 2 BIN 5 Low Emissions Vehicle II (LEV II) regulation.
So FHI has increased the compression ratio from 8.2:1 to 8.4:1, improved the intake, deleted the pre-cat and improved emissions. It's my belief the US 2006 WRX will get an identical engine.

BTW, Subaru has now begun referring to its AVCS as "i-Active Valve Control System" and calling its 2-stage variable valve lift system "i-Active Valve Lift System." What's with the "i-" stuff? Intake? Intelligent?
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Old 06-01-2005, 02:49 PM   #2
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sweet
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Old 06-01-2005, 03:09 PM   #3
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Quote:
What's with the "i-" stuff? Intake? Intelligent?
i = "increase" base price by 3K.
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Old 06-01-2005, 03:29 PM   #4
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.....
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Old 06-01-2005, 09:22 PM   #5
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can't wait to find some scrapped wrx's for a 2.5 shortblock...
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Old 06-01-2005, 10:45 PM   #6
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Jon, My guess is that indeed the FXT will be no more powerful than the older cars, they just made changes to make it more capible of meeting the durablity requirements of the EPA while also cleaning it up a bit more.

Honestly the stock WRX turbo was so far out of its range on the FXT I can't see that as really having the 100K mile duriblity for emissions equipment that the EPA requires. Which likely subaru is starting to find out on its own. Lol 9.5-9.8:1 stock A/F ratios on boost.
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Old 06-01-2005, 11:15 PM   #7
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Quote:
Originally Posted by distorto
can't wait to find some scrapped wrx's for a 2.5 shortblock...

exactly!
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Old 06-01-2005, 11:25 PM   #8
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Quote:
Originally Posted by XT6Wagon
Jon, My guess is that indeed the FXT will be no more powerful than the older cars, they just made changes to make it more capible of meeting the durablity requirements of the EPA while also cleaning it up a bit more.

Honestly the stock WRX turbo was so far out of its range on the FXT I can't see that as really having the 100K mile duriblity for emissions equipment that the EPA requires. Which likely subaru is starting to find out on its own. Lol 9.5-9.8:1 stock A/F ratios on boost.
Boy, you sure aren't kidding. That tiny turbo hits full boost at 1/4 throttle in about 1 second. But, it's all done before you hit WOT. With 4.44 gears, you learn to be really quick with the shifter. Without a significant turbo and IC upgrade, performance is not going to change a whole lot, regardless of what they change. But, on the plus side, it's still very quick. Justs runs out of "boost juice" on the top end.
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Old 06-01-2005, 11:34 PM   #9
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edit: found what i was looking for

Last edited by Kwyjibo; 06-02-2005 at 04:08 AM.
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Old 06-02-2005, 11:29 AM   #10
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hmm secondary air pump system?... hmmm egr?
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Old 06-02-2005, 11:59 AM   #11
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Quote:
Originally Posted by Jaxx
hmm secondary air pump system?... hmmm egr?

.....took long enough for someone to post on that one
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Old 06-02-2005, 12:26 PM   #12
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Quote:
Originally Posted by Jaxx
hmm secondary air pump system?... hmmm egr?
Not EGR. During a cold start an electric pump injects air into the exhaust, upstream from the catalytic converter. This extra (secondary) air, coupled with the rich A/F mixtures needed during cold start, promotes hotter oxidation within the catalytic converter which heats it up to operating temperature much more quickly than simply relying on the exhaust gas temperature to do the heating. Adopting this strategy allowed Subaru to get rid of the low thermal mass closely coupled pre-cat in the uppipe and still achieve LEV-II emissions rating.

Secondary air is only used during cold start.
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Old 06-02-2005, 12:35 PM   #13
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BTW, the 2006 FXT specs, including the new gear ratios, can be found at:
http://vocuspr.vocus.com/VocusPR30/D...7-ef90923db36d
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Old 06-02-2005, 01:47 PM   #14
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The engine and gearing changes have also bumped up EPA fuel economy ratings, especially on the AT model where the gear ratios look pretty high:

05 MT: 19/24
06 MT: 19/25
05 AT: 20/23
06 AT: 21/26

I'd expect the 06 WRX to get the same or maybe even better gas mileage than previous models even with the bigger engine and more power.
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Old 06-02-2005, 01:49 PM   #15
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Quote:
Originally Posted by Jon [in CT]
During a cold start an electric pump injects air into the exhaust, upstream from the catalytic converter. Adopting this strategy allowed Subaru to get rid of the low thermal mass closely coupled pre-cat in the uppipe and still achieve LEV-II emissions rating.
I guess Subaru will be adding this to turbo engines across the board? With the XT and WRX using this setup, I'd guess that the Legacy and Baja would as well. That leaves the Sti...
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Old 06-04-2005, 11:06 AM   #16
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The 05MT and 06MT gear ratios are exactly the same. The difference in mpg is due to aerodynamics and the difference power curve most likely.

The 05AT and 06AT differ only with the final drive, it's now 4.11 instead of the 4.44 of the 05.

Quote:
Originally Posted by drees
The engine and gearing changes have also bumped up EPA fuel economy ratings, especially on the AT model where the gear ratios look pretty high:

05 MT: 19/24
06 MT: 19/25
05 AT: 20/23
06 AT: 21/26

I'd expect the 06 WRX to get the same or maybe even better gas mileage than previous models even with the bigger engine and more power.
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Old 06-04-2005, 02:38 PM   #17
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Gear ratios are identical to the current WRX ratios...How not surprising. Hopefully they stick the 4.44 final in the WRX as well, it will make a big difference.
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Old 06-04-2005, 04:50 PM   #18
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Quote:
Originally Posted by Jon [in CT]
When I heard the 2006 Forester XT makes the same peak torque as the 2005 version (235@3600) but was rated 20 hp higher in power, I assumed (along with many others, I think) that Subaru was merely assigning a more realistic power rating and didn't really change much with the engine.

But I was wrong. According an SOA press release:So FHI has increased the compression ratio from 8.2:1 to 8.4:1, improved the intake, deleted the pre-cat and improved emissions. It's my belief the US 2006 WRX will get an identical engine.

BTW, Subaru has now begun referring to its AVCS as "i-Active Valve Control System" and calling its 2-stage variable valve lift system "i-Active Valve Lift System." What's with the "i-" stuff? Intake? Intelligent?
Subaru over rates their power not under rate it look at the sti saying its 300 and evo is 276?? ne ways they both make like 250 at wheels so....
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Old 06-04-2005, 08:43 PM   #19
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Quote:
Originally Posted by STi-BOD-
Subaru over rates their power not under rate it look at the sti saying its 300 and evo is 276??

Those numbers are rated power at the crank.....just like everybody else rates their HP in sales literature........
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Old 06-04-2005, 11:32 PM   #20
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Quote:
Originally Posted by STi-BOD-
Subaru over rates their power not under rate it ...
I doubt you'll find anyone that agrees with you in the case of the 2005 Forester XT.
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Old 06-05-2005, 03:00 AM   #21
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I agree. The FXT's I've seen on a dyno show 230HP crank. STi's range from 300 to one I saw that hit 315 crank. My LGT was 260 crank IIRC. WRX's usualy turn about thier 227 crank rating. Dyno does a coast down measurement to calculate crank numbers.
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Old 06-05-2005, 03:08 AM   #22
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Quote:
Originally Posted by Jon [in CT]
Not EGR. During a cold start an electric pump injects air into the exhaust, upstream from the catalytic converter. This extra (secondary) air, coupled with the rich A/F mixtures needed during cold start, promotes hotter oxidation within the catalytic converter which heats it up to operating temperature much more quickly than simply relying on the exhaust gas temperature to do the heating. Adopting this strategy allowed Subaru to get rid of the low thermal mass closely coupled pre-cat in the uppipe and still achieve LEV-II emissions rating.

Secondary air is only used during cold start.
What other cars use this method? I think the S2000...and some P-cars? I'm sure a lot of cars have it like that

Before you take a car like that in for smogging...drive like a mad man to get EGT's high enough to burn off any carbon deposits off of the air injector so that it can work well for emissions purposes...someone told me this was referred to as an 'Italian tuneup' :P
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Old 06-05-2005, 06:02 PM   #23
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Sweet..
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Old 06-05-2005, 09:22 PM   #24
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Quote:
Originally Posted by pio!pio!
What other cars use this method? I think the S2000...and some P-cars? I'm sure a lot of cars have it like that
Rx7's
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Old 06-05-2005, 10:09 PM   #25
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Have the look changed at all?
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