http://forums.nasioc.com/forums/show....php?t=2224148


High compression testing being done by this kid in Cali , originally from VA. A friend of mine Jeff Chang debates his encounters with a Manley rod failing with a built 2.5 , hta86 , Aem, E85 etc. Rod broke in half causing engine failure. Poor customer service to bat, no response until today! Check it out. Trying to convince him to come to the darkside . Enjoy.

 

I have read that thread since I now own a 2011 WRX 5-door but there seems to be info missing. For one I would not call that high compression. 11:1 on E85 yes 9.2:1 no. There is no way with a proper tune to be down 80-100 whp.

 

i have owned a 03 evo 8 and now a 08 evo X worked for very respectable performance shop in fl . being that i had to work on wrx i have found that they do have a very good drivetrain system unlike our evos with transfer cases and what not but on other hand subies motors i didnt see holding as much power as evo motors to sum it up evo will and can put power down but subies have a better trans system in my eyes its only my opinion but i hate subies they way they look other than new ones i hate the way they sound

 

I agree with johntuurbotron. Bumping the compression should never lose power, although he didn't do aa very accurate test to begin with. If he wanted valid data the only thing that should have been altered was compression only. He altered the quench area, used a different hg which lowered the compression back down some, and also swapped cams. Which yields invalid data. Im also guessing he had the car dynoed? It would be nice to see dyno sheets and conditions of both days he made runs to compare the humidity and temps as well.

 

thats why i bought an evo

 

lol hell yeah

 

it's not the subaru's fault. Its who ever built it.

Combustion Efficiency is directly related to Static Compression Ratio.

 

Yeah, I'd be curious about an actual compression test difference... something seems strange

 

as was stated in the thread, he also changed cams and the quench.

 

lol you think 9:1 is high compression?

 

If u read through the thread somewhere he states on a compression Test it was 40psi higher than the previous setup.

 

He doesn't show dyno charts... who knows if he did them on the same dyno... one SAE corrected and one not...

he swapped cams which changes your dynamic compression ratio...evidently on his setup it changed a lot.

From the stuff he's saying I don't think he's competent enough to know when he's doing something wrong.

John Heywood is a genious. This guy is a clown. More compression = win.

 

oops, missed that, thanks guys

 

I don't understand why HC wouldn't work on Subaru's. If a engine is nothing more then a big air pump wouldn't HC work just as well as it does on other motors. It may not be as simple, or maybe the boxer motor's inherent flaw where changes in HC don't work. Weird.

Topspeed is a local Subie specialist shop and if they see no gains with HC then I would def. take notice. They cut their teeth on Scooby's before Evo's.

 

It's not a flat head ford...