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Old 12-09-2009, 09:33 PM   #1
dboostjuice
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Default 1.8 turbo



ej22turbo heads
ej 18 block
ej22 headers
ej20 cometic head gasket
arp head bolts

should I be able to boost a td04 to 18 psi. with 370 ss injectors and not be lean?
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Old 12-09-2009, 10:02 PM   #2
Abest10
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I actually boosted 18 psi on a tdo4 on my ej22e block, ej22t heads, ej22t headgaskets, reused headstuds, stock 270cc injectors and no EM, so yes you can.
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Old 12-10-2009, 09:08 AM   #3
sense of nature
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Yes ... But for how long ??
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Old 12-10-2009, 07:25 PM   #4
Abest10
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Ive been on it since June and 2500+miles. Its my DD also.
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Old 12-17-2009, 03:11 AM   #5
joejoe69
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20psi for me on my EJ18T. Its been well over a year now and no major problems for me.

EJ18T's shouldn't be underestimated...
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Old 12-17-2009, 01:17 PM   #6
Harenil
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(Hybrid EJ22T/EG20G)

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I'd get better heads if I were you, the ej22t ones suck. I just replaced mine and went DOHC.
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Old 12-18-2009, 02:18 AM   #7
joejoe69
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You can't use DOHCs on a 1.8L. Too big. You will get HG problems. The EJ22T heads are an upgrade for the EJ18, so its actually good. The EJ22E has better rockers and bigger intake valves. I am building a hybrid head set right now which includes the EJ22E heads, valves, and rockers, coupled with EJ22T valve springs and cams. The 22T cams are peakier than the 22E's.
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Old 12-18-2009, 08:49 AM   #8
jedz123
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Quote:
Originally Posted by joejoe69 View Post
You can't use DOHCs on a 1.8L. Too big. You will get HG problems.
What!?!?! Who told you that!?!? Have you done it? Numbers, actual problems, please note... Not trying to offend just realy curious where your getting that info for mine contradicts yours...
Here is a little history/ info of the EJ25D head I've compiled from threads:
The EJ25D DOHC are nearly Identical to WRX heads used in JDM EJ20G of that time... This is why.
When Subaru put out the EJ25D it was a semi rushed process and they used parts that they had to get the engine out faster. The DOHC heads used on the EJ25D are in essence the EJ20G DOHC heads (change in some casting numbers and cam grind EGR valve etc....). Subaru decided to use this head design because it could move air in and out of the cylinder very well. The new 2.5 being the biggest bore in the Subaru line up had to use dished pistons to drop the compression. Compression would have been to high to run 87octane with the much smaller combustion chamber on the heads they were using... Look bellow and see; this my EJ25D with the head off for work, The first time I saw those pistons I thought (Turbo pistons?), after research I know why they used the dish design.

There was also an EJ20D released in the JDM market that used a variant of these heads with different cams that rated a 160hp rating well into the 7500rpm mark.
However USDM WRX cams Will Not Work, and Will Not Fit in the EJ25D DOHC heads.
THE EJ25D DOHC heads are more like 2.0 heads then 2.5 ones...
I don't have any pics of the combustion chamber but I assure you I just tore this motor down and the heads were nearly identical to WRX heads if it wasn't for N/A casted on the bottom, I couldn't tell the difference...

The SOHC EJ25s have a different head and don't require the dish in the piston to drop the compression. Joe maybe your getting confused with that one. I know there are people who run with the EJ18ts or EJ22 Frakens with DOHC heads on top of their short blocks.

I recommend these heads to any one! I did a Port and Polish on it and even as a N/A the sucker pulls right to it's 6500 rpm redline and is so rev happy, unlike the tractor feel to the SOHC heads...

Any SOHC EJ18 or EJ22 head will flow worse then any DOHC head out there.

Last edited by jedz123; 12-24-2009 at 07:37 AM.
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Old 12-18-2009, 10:27 PM   #9
joejoe69
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I had a pair of 98 RS EJ25D heads and looks to me like it mirrored the EJ20K V4 STi heads. The valve positioning of the 25D DOHC combustion chamber looked so different compared to a SOHC combustion chamber that if placed on the 1.8L block, its possible that the valves may collide with the cylinder walls. That's my biggest fear. Maybe on a 2.2L it worked before, I believe on a small bore 1.8L, it may not. I've said this on other forums that I'd try spin testing a 1.8L/2.5L frankenmotor to see if there would be any binding but I sold those heads already .

Last edited by joejoe69; 12-19-2009 at 02:47 PM.
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Old 12-22-2009, 10:09 AM   #10
dboostjuice
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what hg would you use for that 18.25 combo.? there would be a nasty overlay..?
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Old 12-22-2009, 02:03 PM   #11
69subaru360
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Quote:
Originally Posted by jedz123 View Post
Also USDM WRX cams will work, and fit perfectly in the EJ25D DOHC heads.
THE EJ25D DOHC heads are more like 2.0 heads then 2.5 ones...
I don't have any pics of the combustion chamber but I assure you I just tore this motor down and the heads were nearly identical to WRX heads if it wasn't for N/A casted on the bottom, I couldn't tell the difference...
Nope, USDM EJ205 heads are way different than EJ25D heads. The cams are a larger diameter on the WRX and the buckets are larger. The intake pattern is also different.
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Old 12-23-2009, 12:31 PM   #12
joejoe69
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Quote:
Originally Posted by dboostjuice View Post
what hg would you use for that 18.25 combo.? there would be a nasty overlay..?
I haven't done it yet, neither has anyone that I know or heard of, but I would use an EJ20 or EJ22 HG only because they're a big step above an EJ18 and a step below the EJ25. Still, its a gamble.
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Old 12-24-2009, 02:41 AM   #13
SubaruSVXCrazy
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Sounded like an interesting title. Ha ha, sweet build. GL.
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Old 12-24-2009, 07:34 AM   #14
jedz123
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Quote:
Originally Posted by 69subaru360 View Post
Nope, USDM EJ205 heads are way different than EJ25D heads. The cams are a larger diameter on the WRX and the buckets are larger. The intake pattern is also different.
Ah, Well thanks for the Clarification... I hate the bad info on this forum, I'll edit at once! I read that misinformation on a random thread... So much for running WRX cams when I boost my Outback...

Have a Happy Holiday everyone!
Merry Christmas!
-Jedz

Last edited by jedz123; 12-24-2009 at 07:39 AM.
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