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06-16-2008, 06:04 PM | #276 |
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06-17-2008, 12:35 AM | #277 |
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great thread dude, someone should sticky this def
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07-08-2008, 01:27 AM | #278 |
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thanks everyone for all the good info!
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07-08-2008, 05:18 AM | #279 |
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tons of great info. helped alot.
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07-08-2008, 05:27 PM | #280 |
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Location: Saskatoon, Canada
Vehicle:2004 FXT Silver |
A few questions after reading 12 pages of good info.
Let's say I'm starting with a car that has: - borla UEL - some kind of catback - cams Roughly how much power would I gain with each add-on in the following order: - CAI - HFC - IM PnP - Head works (not sure exactly what) Thanks. |
07-12-2008, 12:45 PM | #281 |
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I briefly re-read this sticky. I didn't come across anything that delt with differnt head combonations on the ej22 block. could some one post their results, and or engineering #'s.
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07-12-2008, 01:30 PM | #282 | |
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Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Quote:
Not much - maybe a couple HP? Minimal gains, although that's somewhat of a guess. Nobody has really played much with the IMs from what I've seen. If you search for SOLUTION's posts, you'll see he tried to put an '05+ IM on his pre-'05 SOHC car. I vaguelly recall that in the end he gave up, but I could be wrong. Extrude-honing the manifold costs big bucks - I think in the $500 range, but it's been a while since I checked E-H's website. Since nobody really knows what the pay-off would be in actual performance gains, that $500 is a tough pill to swallow. Somewhere around here is some flow data from Cobb from a few years back. They found that the IM runner flowed more than a stock intake port, so they essentially said the IM is not a restriction. For those of us with head work and cams, though, that's quite possibly not the story. Jay Storm (aka "Storm") has a pretty cool custom IM on his DSP car and apparently it was well worth it. There's certainly power to be had from head work, but it ain't cheap, and it's not something I would trust to just anyone. Porting and polishing heads is as much art as science, so it's not something I would trust to a local race shop that is used to porting SBF or SBC heads. Pat Olsen |
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07-12-2008, 01:42 PM | #283 |
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Has anyone tried using jdm turbo heads on a NA block?
I saw on another post that the single port heads got more HP then the dual port heads. From advice form builders i've been advised to use the dual port heads. With out any "work" or parts added what heads would be a perfect fit on an ej22? With part availability aside, what head would be the best to use if you were up grading and working on the heads(not including valve control)? What exactly is wrong with the subaru NA exhust heads? The are EL headers. |
07-14-2008, 12:31 PM | #284 | ||||
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Thanks Pat. So it looks like the only clear option for power is cams.
Quote:
Good, I want to keep my stock cat. Quote:
Quote:
Quote:
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07-14-2008, 04:33 PM | #285 |
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You don't generally see it discussed in this forum because going that route is usually reserved for a Forced Induction application. The combustion chamber of the Ej25 heads are bigger than the ej22 ones, and drop the compression ratio down into the 8's. Same thing with the JDM Ej20 heads. Some of those heads have giant combustion chambers that would take you down in the the 6's when mated to the Ej22E blocks. Guys do it all the time, just not for NA power.
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07-14-2008, 05:21 PM | #286 | |
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Quote:
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07-14-2008, 08:13 PM | #287 |
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You discussed the ej25 and ej20 heads, but what about just putting the ej255/257 heads on an ej253 block? Those are dual cam aren't they? Would the fact that they are on the wrx and sti engines effect the compression on the ej253 engine in the same way?
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07-14-2008, 09:30 PM | #288 |
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Sure it can. The trade off is that you lose the cheapness that most people are looking for when they are doing the lego engines. I personally have wanted to build an 9000 rpm revving NA Ej22 for years. I think it's the perfect balance of torque and ability to rev. But such a thing would not be a cheap build.
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07-14-2008, 09:34 PM | #289 | |
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Quote:
And then you've got to consider that the cam grind of a high performance FI application isn't generally the best for a performance NA application. So you'd be shopping for cams. The other thing is that I don't honestly know what the combustion chamber volume of those heads is. I couldn't tell you the impact on CR without knowing that bit of info... |
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07-16-2008, 09:05 PM | #290 |
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If you haven't noticed yet I'm fishing for ideas for my own car, trying to do some research on what I need to look for. If the compression on the 255 heads were too low, I could just have them sanded down, yes? And for the cams it makes sense that the stock ones are intended for FI would be different, but in what way? How are FI cams different than NA cams? By the way I did the forum searches on the topic, but cams hadn't come up.
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07-17-2008, 02:55 PM | #291 |
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This is a great thread!
I just bought an 08 2.5i, is there anything that I can do that won't void the warranty? Thanks |
07-22-2008, 12:56 PM | #292 |
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you might want to speak with the subaru service manager from where you got the car. He will tell you if they take the car with aftermarket parts or not.
Also take into account that SPT parts should not void the warranty but I read that some people got their warranty canceled due to the use of these because it is "offroad use only" |
07-22-2008, 02:33 PM | #293 |
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back to the polished IM. I have done this on a 2001 RS, took out casting flaws, opened up the head side a little, made the TB side glass smooth(as far as I could reach in there), smoothed out the idle air passage, and saw.....not much. It felt a little smoother, but that's about it.
I did it to get to know the IM better and since I had time and felt like it, I did it. mods at the time were: CAI borla UEL headers, 2.25" exhaust, 1 normal cat, stromung muffler cobb mild cams lw flywheel/pulley polished TB SAFC a month or 2 later I cleaned up the welding flaws on the headers where it mates to the heads, that made more of a difference and made everything quite a bit smoother. |
07-22-2008, 05:03 PM | #294 |
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about the exhaust not being bigger than 2.25 inches, is there a dyno test that proved that anything bigger actually lost power? thanks
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07-22-2008, 06:40 PM | #295 | |
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Quote:
While that may be just butt dyno measurements, I would expect any more that 2.25" would just be worse. -N |
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07-22-2008, 11:45 PM | #296 |
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This most def. needs to be stickied.
Regarding this statement. "Typically a good resonator in the midpipe will restore the "rumble"." Elaborate please. I need more rumble in my life. |
08-19-2008, 12:28 AM | #297 |
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good read, why isn't this stickied?
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08-19-2008, 12:38 PM | #298 | |
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Location: North Pole
Vehicle:2005 Legacy GT Wagon ABP |
Quote:
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08-19-2008, 04:35 PM | #299 |
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That car already has UEL headers. I was talking about for the EL cars.
Sounds good though. |
08-19-2008, 06:34 PM | #300 |
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nope that car has the stock headers.
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