USDM heads with the Double-D treatment. '06 EJ255 Stock '06 EJ255 heads Intake: .100" = 86cfm .200" = 177cfm .300" = 237cfm .397" = 253cfm Exhaust (straight) .100" = 72cfm .200" = 145cfm .300" = 185cfm .398" = 203cfm Exhaust (dog leg) .100" = 72cfm .200" = 142cfm .300" = 180cfm .400" = 192cfm New numbers with a 5angle valve job with blending afterward. A bit more work on the exhaust ports especially the dog leg to bring out some more CFM. Intake: .100" = 90cfm .200" = 185cfm .300" = 251cfm .390" = 283cfm Exhaust (straight) .100" = 84cfm .200" = 165cfm .300" = 208cfm .400" = 225cfm Exhaust (dog leg) .100" = 90cfm .200" = 164cfm .300" = 206cfm .400" = 220cfm Stock valves, no valve job. Superflow600@28" Intake: .100" = 87cfm .200" = 177cfm .300" = 254cfm .398" = 283cfm Exhaust (straight) .100" = 81cfm .200" = 160cfm .300" = 202cfm .400" = 225cfm Exhaust (dog leg) .100" = 75cfm .200" = 150cfm .300" = 191cfm .400" = 211cfm Some lines graphs. We all LOVE line graphs!!!! We rounded the lifts to .400" since it was so close. Gives you an idea. ---------------------------------------------------------------------------- '04 EJ257 Stock valves, no valve job. Superflow600@28" Intake .100" = 84cfm .200" = 172cfm .300" = 246cfm .398" = 276cfm Exhaust (straight) .100" = 75cfm .200" = 155cfm .300" = 203cfm .400" = 219cfm Exhaust (dog leg) .100" = 72cfm .200" = 152cfm .300" = 192cfm .400" = 205cfm
They look great mt. Fuji!!! You're missing a shot with the DD fingers doing the exam and a reference scale with the bottle cap. Now can you use your imagination and do a flow test of these heads. LOL When are you putting it all back together?
a hair under yours. 3076R. This port job should help it breath up top with larger cams, especially more lift, 10-11mm. This just is a tad wider than the JDM big ports, and a hair shorter. They rival the JDM big ports. However with the valve seat is blended with the port runner, that's where gains are had.
yups, will be leaving them like that. Tips? I wanted to go more into the long side where the valve guide is, but that will lengthen the travel. The JDM heads are like that, however their casting is different from our USDM heads. I don't know how much ROOM I have before going through the head. Had they kept the same casting as the '02-'05 WRX heads, I would have more room.
GT3076R, if not that and he wants more, GT35R??? not my choice on turbos... his.. lolz I just make heads breath because I hate the stockers... These are some of the tools, all the porting and shaping done with the bit.
Fuji you know you are one of the only people on here to think outside the box, so do a TFL and spool that 30R at like 3,600RPM's
For the '98 DOHC heads??? Any cams made for phase1 heads will be the ones to get. Delta are decently priced for regrinds. JUN makes for phase1.... Kelford also makes some... but those would be expensive cams to go with.
So how good are the stock ej25D heads? I have mine off the motor again, and am wondering if i should bother having anything done to them (they're already completely rebuilt). I'm only going to be running a VF39 (if even that) this year, I currently just have a TD04. What's your thoughts on this oh wise one?
Being that they are D-style port runners already, you can look at blending the valve seat with the port runner at the valve throat. Some heads there's a big step, some heads it's not that bad. You can also enlarge the valve bowl area on the exhaust side to improve exhaust flow. The phase2 heads have it better on the exhaust side than phase1 heads. More gain is seen when you run big turbos because of more air flowing through.
The secret behind mt. Fuji Industries success!!! What you'd like some DD'z for Christmas! I've finally got a chance to see these DD in person and its clear mt. Fuji Ind. has done his homework. The attention to detail is hard to miss when these heads are placed side by side. Besides the dyno, the next step might be to get a data aquisition so you can see just how many lakes you've covering. LOL
Those don't look that bad really, aside from that nasty lip at the end of the runner/valve seat. I've seen 4g63 heads that the casting wasn't aligned for sh*t and you could see that it was shifted almost 1/8" sideways..... :eek3: :ugh: Mmmmmm headwork.... EDIT: They don't look that bad for factory heads... -Steve
^Yah, well your talking about dsmland there. Where there struggle to line up main bearings..... :laugh:
I'd say the stock are ok. However being that I've seen JDM Ver6 heads and GDB big ports, USDM 2.5 DOHC NA big and slightly smaller, also stock WRX, they are small and could be better. You have to see these ported ones in person and also the stocks. If people come out to Firestone tomorrow, I'll bring out the stock AND almost done ported heads. This way you can see how much bigger.
You might want to bring some lighting as well as some rubber gloves and valsaline. Looks like the DD are going to have a busy night. But seriously mt. Fuji is really going out of his way to help educate us on this concept. And he is right, those small little details are hard to see from a picture. They look promising, but we won't know till we can put them to the test on a track.
I'll be rocking my stock 25D heads, and getting a set for a full make-over down the road. Supertec make a nice full vavletrain kit which included all valves, dual springs, locks, titanium retainers, etc for about $400, which is very reasonable. Add some Deltas or Kelfords and wooooohaaaaaa. I can't justify headwork with a middle of the road turbo. If I had more than a 350whp pump gas capable turbo, I'd think otherwise.
The STOCK STi exhaust ports sucks. I hate them. Hard to make out how much room I have before going through. What I did instead was improve the exhaust ports on cylinder #1 and will try to replicate on it on cylinder #4.
Video of the exhaust ports since I can't get a camera in there. They suck and are small from factory.
Flowed on a SF-600 @ 28" Intake .1" - .2" - .3" - .380" (couldn't get the stock cam to hit .4" lift??) 84 - 172 - 246 - 276 Dog Leg .1" - .2" - .3" - .4" 72 - 152 - 192 - 205 Straight Leg .1" - .2" - .3" - .4" 75 - 155 - 203 - 219
It's hard to fine stock numbers that'll work. However.. I found these numbers, and it gives us an idea. http://forums.nasioc.com/forums/showthread.php?t=1202574 I converted the Cosworth heads to 28" WRX head Intake Port flow @ 28" IIRC (as reported on Jorge's site): Lift = CFM .1" = 81 .2" = 177 .3" = 234 .4" = 234 Stock STi Intake Port Flow @ 28" (as reported by Cosworth): Lift in mm = Flow in CFM .1" = 67 .2" = 164 .3" = 215 .4" = 232 Lower lift numbers on the STOCK STi heads probably from the imperfections of the valve seat to the port. I've seen this in the STi head I have, as well as the STI head online@NASIOC. The step of the valve seat isn't as apparent on the WRX 2.0L or the WRX 2.5L head. Here's some stock WRX numbers: http://rs25.com/forums/showthread.php?p=1688784#post1688784 Lift Intake Exhaust .050 16 cfm 11 cfm .100 61 cfm 44 cfm .200 188 cfm 147 cfm .300 240 cfm 194 cfm .400 248 cfm 205 cfm Again, it's hard to compare numbers because also temperature plays a role and such. This gives you an idea.
I remember quite some time ago Cobb compared EJ22T heads, EJ25D, and chevy LS1. I can't find the graph anymore, but I remember the numbers at 195 for the 22T heads and 250 for the 25D. The 25D head outflowed the LS1 port for port.
Of course! The EJ25D heads on the intakes are HUGE!!!! I think the intakes flow around the same if not just a hair under these ported STi heads. I have a '96 EJ25D sitting in the basement with the rest of the heads.
