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Old 08-22-2011, 09:33 PM   #1
REDrum
Scooby Specialist
 
Member#: 61536
Join Date: May 2004
Chapter/Region: NESIC
Location: Peoples Republik of Cambridge
Vehicle:
WRX' 04Road02gravel
www.ToltecRally.com

Default v8 vs v9?

Can someone advise on the differences between v8 and v9 EJ207 engines? I've search but cannot find much. Turbo type, internals, heads, valves, swap pointers/pitfalls...

Lot on differences between v7 and v8, but not much on v9s...
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Old 09-01-2011, 05:22 PM   #2
Vlad
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Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
Vehicle:
02 WRX
Sti V9 Spec C

Default

V9 starts in '05.
There are some differences in connecting rods, meaning the part number is different, however, the part number for the V8 is superceded by the one for V9.

Another difference is the neutral safety switch needed. If you swap a V9 and keep the 5 speed, you need a 2004+ WRX neutral safety switch for correct polarity.

The exhaust manifold is of a different part number, the Spec C intercooler is improved over the preceding versions.
I am told that the downpipe is US length, although mine was not. I think my downpipe was not V9.
The one thing that kinda makes me wonder, is that the pictures that I've seen of the V9 long downpipe show an additional resonator, in that extended section.
My exhaust is droning a bit, there either is a leak at the carbon donut gasket, or that resonator is necessary.
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Old 09-03-2011, 01:42 PM   #3
805WRX
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Member#: 22920
Join Date: Aug 2002
Location: oxnard ca 805
Vehicle:
2005 impreza WRX STi
WR blue

Default

Quote:
Originally Posted by Vlad View Post
V9 starts in '05.
There are some differences in connecting rods, meaning the part number is different, however, the part number for the V8 is superceded by the one for V9.

Another difference is the neutral safety switch needed. If you swap a V9 and keep the 5 speed, you need a 2004+ WRX neutral safety switch for correct polarity.

The exhaust manifold is of a different part number, the Spec C intercooler is improved over the preceding versions.
I am told that the downpipe is US length, although mine was not. I think my downpipe was not V9.
The one thing that kinda makes me wonder, is that the pictures that I've seen of the V9 long downpipe show an additional resonator, in that extended section.
My exhaust is droning a bit, there either is a leak at the carbon donut gasket, or that resonator is necessary.
yea my V9 swap came with the US lenght DP, but i think its only Spec C and S model engines that come with that DP.
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Old 09-03-2011, 03:02 PM   #4
Vlad
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Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
Vehicle:
02 WRX
Sti V9 Spec C

Default

Meanwhile, I've checked my exhaust for leaks, there are none. The extra resonator is probably needed.
I am using a Prodrive exhaust, that already has the USDM WRX resonator.
My ej205 had no droning whatsoever.
There is a chance that the v9 part number headers are of higher flow, but require the resonator.
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