Phase 1 EJ25 AUto-x MOtor build

bmxpunk · 03-02-2007, 03:35 AM

SO while I am working on my 2.2t build, my friend is doing a phase 1 2.5 L build at the same time.

THe car started as a 93 impreza L. It has been fully gutted with only two seats upfront and no sound deadening. Lightweight bumper beams have also taken place of the safety miinded stockers. Suspension is going to be gone through with a mix of GroupN sti and poly urethane bushings and mounts, Sti tarmac/gymkhana springs and struts yet to be decided.

THe car is going to be geared toward auto cross and daily driving. Albeit noisy and bland with a flat white coat of paint.

THe motor Started as a Dual cam 2.5 from a 98 Legacy. WE are installing phase II pistons (it can be done as this motor ran for 2 years like that). But this time we are boring it .5mm over. These are stock subaru pistons by the way, and should be a little over 11:1 compression with this block. THe Twin cam heads are staying!! They have been sent off of port/Polish and ceramic coating of the combustion chambers and piston crowns. Breathing will be helped out by a set of delta or webb camshaft regrind. THe intake manifold was swapped out for a Japanese unit that lacks the egr crap.

Exhaust will be handled by an OBX header that just arrived, mated to a stromung dualtip cat back. This header looks super nice for the price. The finish is great and all port entries have been cleaned up form the factory, so its smooth all the way through. Cant wait to see the fit of it.

THe stock tranny is still in place, but to be mated to an exedy lightweight flywheel and stage2? clutch. also staying put is the 4.11 rear diff
What the factory computer wont take care of, we hope to adjust using the greddy Emanage ultimate.

We aren't trying to set the world ablaze but having a super responsive NA autcross car is our goal. Any guesses on what kind of power we can make with this setup?

Stay tuned I will take some pictures soon.

* Registered users of the site do not see these ads.

cmiovino · 03-02-2007, 10:54 AM

Can't wait for the pics

bmxpunk · 09-06-2007, 12:11 AM

Well here is the car in for paint. THe whole car is going to be flat WHite. With all the pink STI bits underneath. Pretty basic which is kinda nice I think!

bmxpunk · 03-01-2008, 03:10 PM

OK now with most of the pieces here... sans heads..... we spent this morning installing all the suspension!! that and building the short block. Our hope is to have everything together this wednesday, so once the sexy ported heads arrive, its game time.

Behold!!!

Ceramic and moly coated phase 2 piston (11.5ish : 1 with phase 1 heads)

Front control arms with Super Pro bushings and moog ball joints

Front x-member, whiteline 22mm bar, Whiteline Anti-lift kit, Perrin Endlinks

I should have engine build pics later today

Whiteghost 2.5 · 03-01-2008, 03:23 PM

What class are you building this for? Or are you just building it to have fun at local competition? Looks very nice. I loke seeing more high comp motor builds.

Josh

bmxpunk · 03-01-2008, 04:36 PM

It will be for local auto-x and rallycross races. But living here in wyoming... we kinda missed out on the "real" rules for solo competition. They generally split our classes into novice, intermediate, advanced and race tire classes here, mostly due to our low turn out (that last race we had consisted of 9 subarus an evo and an svt focus). Which ultimately is really quite lame because if we traveled to race we would easily be outclassed.

At the same time it is wyoming, and I think we have more secluded dirt roads than people, so thats where we spend alot of our weekends.

We really wanted to see what we could do with Subaru OEM parts to create high compression. With coatings, machine work, and new bearings I think there is less in the block than buying a set of High compression pistons form wiesco or TWE.

Counterfit · 03-01-2008, 06:18 PM

That is one sexy piston.

Is that control arm custom?

Patrick Olsen · 03-01-2008, 09:55 PM

Quote:

Originally Posted by bmxpunk

Ceramic and moly coated phase 2 piston (11.5ish : 1 with phase 1 heads)

I'm curious how you calculated that. Using a CR calculator I got from TWE, I get about 10.3:1 using P2 pistons in a P1 block with P1 rods and P1 heads.

Quote:

Originally Posted by Counterfit

Is that control arm custom?

Looks like a stamped steel control arm that has either been stripped or painted silver.

Quote:

Originally Posted by bmxpunk

Any guesses on what kind of power we can make with this setup?

Without knowing what cams you're going to use or how aggressive/extensive the P&P job on the heads will be it's kind of hard to make any realistic guess. I did ~145whp (Dyno Dynamics) / ~168whp (Dynojet) with stock rotating assembly (thus stock CR) on my '97 DOHC with Cobb stage 1 heads and cams. More aggressive cams would've yielded a bit more power, and obviously your higher CR will help.

Pat Olsen

bmxpunk · 03-02-2008, 12:07 AM

Quote:

Originally Posted by Patrick Olsen

I'm curious how you calculated that. Using a CR calculator I got from TWE, I get about 10.3:1 using P2 pistons in a P1 block with P1 rods and P1 heads.

Looks like a stamped steel control arm that has either been stripped or painted silver.

Without knowing what cams you're going to use or how aggressive/extensive the P&P job on the heads will be it's kind of hard to make any realistic guess. I did ~145whp (Dyno Dynamics) / ~168whp (Dynojet) with stock rotating assembly (thus stock CR) on my '97 DOHC with Cobb stage 1 heads and cams. More aggressive cams would've yielded a bit more power, and obviously your higher CR will help.

Pat Olsen

Hmm interesting pat. I need to go through and do some math again then. I thought I had discussed this with matt monson, but as you can see by the dates on my posts, it has been almost a year since the project started. So if I am way off, I am sorry. Maybe the difference was in the head gasket choice(hmm but that shouldn't lead to a whole point difference in CR)... it is my buddies build I will have to check with him to see what thickness he was using.

Yes the control arm is stock, we used a really aggressive parts cleaner and that was the color of spray paint that was near by once we were finished.

The cams I think should be similar to yours since we are using the webb cams and I thought (definitely could be wrong) that was who did cobbs profiles. As far as the port job goes, I hope to have some numbers anyday from that for comparison.

I can't remember Pat, did you have any engine management? We are going to use the greddy emanage ultimate to see what we can accomplish as well. The car will be dyno'd down in colorado at 4000'+ of elevation granted we are at or just under 5000, and I really want to see how badly that will affect power. But I will post those as soon as all is said and done.

rougeben83 · 03-02-2008, 03:16 AM

Speaking of control arms...have you thought about using WRX sedan control arms in the front? The extra 20mm in front track should be helpful for autoxing.

Patrick Olsen · 03-02-2008, 07:34 PM

Quote:

Originally Posted by bmxpunk

Hmm interesting pat. I need to go through and do some math again then. I thought I had discussed this with matt monson, but as you can see by the dates on my posts, it has been almost a year since the project started. So if I am way off, I am sorry. Maybe the difference was in the head gasket choice(hmm but that shouldn't lead to a whole point difference in CR)... it is my buddies build I will have to check with him to see what thickness he was using.

The 10.3:1 is using the thinnest OEM gasket (0.5mm, according to TWE).

Quote:

Originally Posted by bmxpunk

The cams I think should be similar to yours since we are using the webb cams and I thought (definitely could be wrong) that was who did cobbs profiles. As far as the port job goes, I hope to have some numbers anyday from that for comparison.

Yeah, I think that was the consensus, that Webb did Cobb's stuff.

Quote:

Originally Posted by bmxpunk

I can't remember Pat, did you have any engine management? We are going to use the greddy emanage ultimate to see what we can accomplish as well. The car will be dyno'd down in colorado at 4000'+ of elevation granted we are at or just under 5000, and I really want to see how badly that will affect power. But I will post those as soon as all is said and done.

I just had/have an S-AFC to adjust the mixture. It definitely helps - more torque at the low end with a richer mixture, more power at the top end since the stock fuel trim is incredibly rich. I'll be interested to see what the emanage can do, as it's certainly a more capable piggyback than the S-AFC.

Pat

bmxpunk · 03-03-2008, 11:07 AM

Ok I am really confused now Pat. Granted I don't know how reliable the "ejcalcs" web page is, but it says by using a stock phase 1 ej25 with the thin head gasket brings you up to 10.5:1. And that is before the phase 2 pistons with less dish volume. ????

http://wac.addr.com/auto/obs/turbo/ejcalcs.html

yes I am really interested in what the emanage can do not to mention the car is running off the 95 1.8L ecu that was "reclocked or reworked" by Jc speed so the rev limit is a little over 7100.

Patrick Olsen · 03-03-2008, 05:52 PM

The P2 pistons do have less dish to them, but they also have a shorter compression height, so you lose some compression that way.

Pat

bmxpunk · 05-02-2009, 02:55 AM

Ok so It has been a while since I updated this project and lets just say it changed a bit.

THis went from being an Auto X car to a stage rally car. Grnated we are using more or less the same suspension minus the giant sway bars. Its far from optimal but our first season in stage rally so I need to slow down, learn and preserve the car.

Roll Cage

Seats

Engine In finally!!

ALmost done (with race wheels):

Finished product: Note pink wheels are for winter tires and not mine, heck the car isn't mine I just drive it

Had a few miles for shakedown. Had to do some custom stuff for cooling fan wiring but that is the only problem as of yet.

I went throught and stripped the wiring harness and we did a few other things and as the car sits it is exactly 2500lbs. Have a few more ideas to lose some weight out of it so we can hopefully make the best use of the NA engine.

Have had a few shake down miles on it though and wow!! FOr a guy used to sohc 2.5's and Turbo 2.2, this thing is different!!! it is very smooth from idle through 4000, but from 4500- 7200 it is a monster!! Shift at 7000 and you are still well within the meat of the powerband. Hope to get some more miles on it sunday, since the first event is next weekend.

03-02-2007, 03:35 AM	#1
bmxpunk Scooby Specialist Member#: 89599 Join Date: Jun 2005 Chapter/Region: RMIC Location: middle of nowhere, wyoming Vehicle: 1995 almost 22B:) red	Phase 1 EJ25 Open Light Rally Build SO while I am working on my 2.2t build, my friend is doing a phase 1 2.5 L build at the same time. THe car started as a 93 impreza L. It has been fully gutted with only two seats upfront and no sound deadening. Lightweight bumper beams have also taken place of the safety miinded stockers. Suspension is going to be gone through with a mix of GroupN sti and poly urethane bushings and mounts, Sti tarmac/gymkhana springs and struts yet to be decided. THe car is going to be geared toward auto cross and daily driving. Albeit noisy and bland with a flat white coat of paint. THe motor Started as a Dual cam 2.5 from a 98 Legacy. WE are installing phase II pistons (it can be done as this motor ran for 2 years like that). But this time we are boring it .5mm over. These are stock subaru pistons by the way, and should be a little over 11:1 compression with this block. THe Twin cam heads are staying!! They have been sent off of port/Polish and ceramic coating of the combustion chambers and piston crowns. Breathing will be helped out by a set of delta or webb camshaft regrind. THe intake manifold was swapped out for a Japanese unit that lacks the egr crap. Exhaust will be handled by an OBX header that just arrived, mated to a stromung dualtip cat back. This header looks super nice for the price. The finish is great and all port entries have been cleaned up form the factory, so its smooth all the way through. Cant wait to see the fit of it. THe stock tranny is still in place, but to be mated to an exedy lightweight flywheel and stage2? clutch. also staying put is the 4.11 rear diff What the factory computer wont take care of, we hope to adjust using the greddy Emanage ultimate. We aren't trying to set the world ablaze but having a super responsive NA autcross car is our goal. Any guesses on what kind of power we can make with this setup? Stay tuned I will take some pictures soon. * Registered users of the site do not see these ads. Last edited by bmxpunk; 05-02-2009 at 02:38 AM.

09-06-2007, 12:11 AM	#3
bmxpunk Scooby Specialist Member#: 89599 Join Date: Jun 2005 Chapter/Region: RMIC Location: middle of nowhere, wyoming Vehicle: 1995 almost 22B:) red	Well here is the car in for paint. THe whole car is going to be flat WHite. With all the pink STI bits underneath. Pretty basic which is kinda nice I think! Last edited by bmxpunk; 09-06-2007 at 12:20 AM.

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03-02-2007, 10:54 AM	#2
cmiovino Scooby Specialist Member#: 134005 Join Date: Dec 2006 Chapter/Region: MAIC Location: Pittsburgh, PA Vehicle: 2004 WRX Premium PSM	Can't wait for the pics

03-01-2008, 03:10 PM	#4
bmxpunk Scooby Specialist Member#: 89599 Join Date: Jun 2005 Chapter/Region: RMIC Location: middle of nowhere, wyoming Vehicle: 1995 almost 22B:) red	OK now with most of the pieces here... sans heads..... we spent this morning installing all the suspension!! that and building the short block. Our hope is to have everything together this wednesday, so once the sexy ported heads arrive, its game time. Behold!!! Ceramic and moly coated phase 2 piston (11.5ish : 1 with phase 1 heads) Front control arms with Super Pro bushings and moog ball joints Front x-member, whiteline 22mm bar, Whiteline Anti-lift kit, Perrin Endlinks I should have engine build pics later today

03-01-2008, 03:23 PM	#5
Whiteghost 2.5 Scooby Specialist Member#: 72994 Join Date: Oct 2004 Chapter/Region: South East Location: Spring Hill FL Vehicle: 2001 Racekor Emerald Green	What class are you building this for? Or are you just building it to have fun at local competition? Looks very nice. I loke seeing more high comp motor builds. Josh

03-01-2008, 04:36 PM	#6
bmxpunk Scooby Specialist Member#: 89599 Join Date: Jun 2005 Chapter/Region: RMIC Location: middle of nowhere, wyoming Vehicle: 1995 almost 22B:) red	It will be for local auto-x and rallycross races. But living here in wyoming... we kinda missed out on the "real" rules for solo competition. They generally split our classes into novice, intermediate, advanced and race tire classes here, mostly due to our low turn out (that last race we had consisted of 9 subarus an evo and an svt focus). Which ultimately is really quite lame because if we traveled to race we would easily be outclassed. At the same time it is wyoming, and I think we have more secluded dirt roads than people, so thats where we spend alot of our weekends. We really wanted to see what we could do with Subaru OEM parts to create high compression. With coatings, machine work, and new bearings I think there is less in the block than buying a set of High compression pistons form wiesco or TWE.

03-01-2008, 06:18 PM	#7
Counterfit Scooby Specialist Member#: 124254 Join Date: Aug 2006 Chapter/Region: NESIC Location: Rhode Island Vehicle: 2006 06 SGM Slowbaru "The Scoobinator"	That is one sexy piston. Is that control arm custom?

03-02-2008, 03:16 AM	#10
rougeben83 Scooby Guru Member#: 115154 Join Date: May 2006 Chapter/Region: MWSOC Location: NYC Vehicle: 2003 Legacy L Turbo silver	Speaking of control arms...have you thought about using WRX sedan control arms in the front? The extra 20mm in front track should be helpful for autoxing.

03-03-2008, 11:07 AM	#12
bmxpunk Scooby Specialist Member#: 89599 Join Date: Jun 2005 Chapter/Region: RMIC Location: middle of nowhere, wyoming Vehicle: 1995 almost 22B:) red	Ok I am really confused now Pat. Granted I don't know how reliable the "ejcalcs" web page is, but it says by using a stock phase 1 ej25 with the thin head gasket brings you up to 10.5:1. And that is before the phase 2 pistons with less dish volume. ???? http://wac.addr.com/auto/obs/turbo/ejcalcs.html yes I am really interested in what the emanage can do not to mention the car is running off the 95 1.8L ecu that was "reclocked or reworked" by Jc speed so the rev limit is a little over 7100.

03-03-2008, 05:52 PM	#13
Patrick Olsen NASIOC Supporter Member#: 120 Join Date: Jul 1999 Chapter/Region: AKIC Location: Where the Navy sends me... Vehicle: 1997 Legacy 2.5GT QuickSilver Metallic	The P2 pistons do have less dish to them, but they also have a shorter compression height, so you lose some compression that way. Pat

05-02-2009, 02:55 AM	#14
bmxpunk Scooby Specialist Member#: 89599 Join Date: Jun 2005 Chapter/Region: RMIC Location: middle of nowhere, wyoming Vehicle: 1995 almost 22B:) red	Ok so It has been a while since I updated this project and lets just say it changed a bit. THis went from being an Auto X car to a stage rally car. Grnated we are using more or less the same suspension minus the giant sway bars. Its far from optimal but our first season in stage rally so I need to slow down, learn and preserve the car. Roll Cage Seats Engine In finally!! ALmost done (with race wheels): Finished product: Note pink wheels are for winter tires and not mine, heck the car isn't mine I just drive it Had a few miles for shakedown. Had to do some custom stuff for cooling fan wiring but that is the only problem as of yet. I went throught and stripped the wiring harness and we did a few other things and as the car sits it is exactly 2500lbs. Have a few more ideas to lose some weight out of it so we can hopefully make the best use of the NA engine. Have had a few shake down miles on it though and wow!! FOr a guy used to sohc 2.5's and Turbo 2.2, this thing is different!!! it is very smooth from idle through 4000, but from 4500- 7200 it is a monster!! Shift at 7000 and you are still well within the meat of the powerband. Hope to get some more miles on it sunday, since the first event is next weekend.