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Old 05-28-2000, 01:27 AM   #1
Michael
Scooby Specialist
 
Member#: 989
Join Date: Feb 2000
Location: New York
Vehicle:
99 RS Turbo
Graphite Gray Pearl

Post JUN's 2.5

Has anyone read or seen the article in the impreza magazine vol 5. ITs about Jun's 2.5
they raised the displacement to a 2.6. Didn't see the point of doing that. Can someone clear that up. I can pick up some of the character here but still can read the article since it was in japanese and i am chinese. oh well. Anyone know the spec of that car?
TIA
Michael
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Old 05-28-2000, 05:25 AM   #2
N/A
Scooby Specialist
 
Member#: 133
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Burlington, WA
Vehicle:
TBA TBA
TBA

Post

Maybe they changed the cams to allow for better top end, then gave it larger displacement to make up for the lost torque when they changed cams? Hey wonder if they raised the redline? How much more can they take the displacement? Sounds cool though.
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Old 05-28-2000, 02:39 PM   #3
adam99rs
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Member#: 20
Join Date: Jun 1999
Location: New York
Post

I have the article and a in process of having it translated for the guys at Rallispec. Basically, JUn built up a bad-ass turbomotor, using an EJ25 as the block, as it required less machining for the pistons they elected to use (which gave it the 2.6 displacement...slight overbre). I am unclear abut head specs (though the are listed, but the turbo is clearly a T77....very similar to what many of the fast FD3S and Supra guys use.
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Old 05-28-2000, 02:45 PM   #4
adam99rs
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Member#: 20
Join Date: Jun 1999
Location: New York
Post

Actually, cylinder 4 is not the problem at all (at least on Sube's I have seen blown). On the EJ20 (particularly the STI V5/6 cars for some reason...sme of the UK gys can explain why) cylnder 3 tends to rn a bit leaner. I hae not seen any proof of this on the EJ25 though.

Jay is right, deally, you should have a probe in each bank. But, the best way to do it is to measure which pipe is longer (the ones from cyinders 1 and 2, or 3 and 4), and place it as far up the longest pipe as possible. This will give you the hottest region, which allows you to tune conservatively.
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Old 05-28-2000, 06:52 PM   #5
Imprezer
Dynamic Uno
 
Member#: 1
Join Date: Jun 1999
Chapter/Region: BAIC
Location: Alameda, CA
Vehicle:
2011 Impreza WRX STi
Black

Post

As far as I could tell with my "B" in Japaneese language, the bore was kept the same. They used a JUN crankshaft which increased the stroke of the EJ25, therefore, creating a 2.6L EJ25 stroker.
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