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Old 10-18-2000, 03:51 PM   #1
WRXwannbe
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Post EJ25 DOHC on EJ22T block

I've seen people hear people do this.
I have an '97 EJ22 n/a. This subject has been on the message board before.
I'm just wondering, how does everything work with this procedure.
How does the turbo respond to this?
Can the EJ22T crankshaft handle Dual cams? What is the final displacment?
What if one used low comp pistons?
What would the drive ratio be when connected to the stock auto transmission and what type of rear diff best works with this set up?
Of course an EJ25 intake maniforld would be needed, the next quetion, does the EJ25's ECU just plug up?
Or would there be a mountain of rewiring?

Is it worth making this engine in hopes of attaching a IHI VFxx turbo (xmember needed)or T28+?

with afc and the like, would one be able to run more than 5 PSI with stock injectors? New fuel pump would be needed and pressure controler. Would it make a difference to run dual injectors in from the Throttle body that are controlled externally?

I hope we can make sense of this!
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Old 10-18-2000, 05:05 PM   #2
MPREZYA
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The EJ22T uses low comp pistons and supposedly hardened internals and also is a closed deck motor (remember it's built to be turbocharged!!!) and the compression ratio was 8.5-1 IIRC.
Your stock auto is pretty much the same as the Legacy turbo IIRC but they came with a LSD rear diff.
Arik "Tyrmelter" is running 14psi (Volvo T-3) with no add on SAFC or Computers other than a 98 RS ecu. He starts to run lean at WOT so an SAFC will help along with a fuel pump and possibly an ITC.
Andre Vanderberg is running 99RS SOHC and EJ22T block at 14psi with a Feild SFC and a Minnam Turbo kit. His setup seems to run good but it is slightly laggy due to the larger turbo.
If you want PM Andre or Let me know and I will try and track down Arik and let him know you want to ask him about his setup.
Rich


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Old 10-18-2000, 05:32 PM   #3
WRXwannbe
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Hahah thanx man!,
ONE DAY I TOO WILL BE PART OF THE 14PSI CLUB!!!!!!!!!!!!!!!
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Old 10-18-2000, 09:53 PM   #4
Andre Vandenberg
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Hey guys,

Actually, I am running a MY 98 car with a EJ22T "short" block (very short), with 98 DOHC heads, Minnam Stage II @ 0.7 bar everyday use, "occational" 1 bar use.

The best thing to do would be to use the 2.5 heads and intake manifold with all your sensors adapted to it. Also, for ANYTHING over 7 psi slap the FPR and upgraded pump into it, as well as fuel lines. The MY 98 lines feeding the injectors are WAY too small to sustain 7 psi + for any long period of time. (Like 1st through 5th WOT). The stock fuel pressure regulator also has a restrictor in it that reduces the ID to about 2.5mm! So I don't care if you have a 500 gal a sec pump, it aint gonna flow past that sluce gate!!
If you need any Q's answered or want to look at the car, let me know.
Andre
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Old 10-18-2000, 09:57 PM   #5
WRXwannbe
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What is the engines displacement? have you experience any knocking? and how much above 7 PSI could you go if your fuel system was fully customized? Any problems you encountered?
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Old 10-18-2000, 10:10 PM   #6
ColinL
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Dude, it is an EJ22T shortblock. It displaces ~2200cc just like it did with the crappy original equipment SOHC heads, only now it has a better DOHC pair.

A better question would be: what is the static compression ratio?

[This message has been edited by ColinL (edited October 18, 2000).]
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Old 10-19-2000, 04:05 PM   #7
Andre Vandenberg
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Don't know what the CR is, I have not "officialy" tested it yet.
My guess would be somewhere between 8.5:1 and 9:1 ( Based on the amount of lag the car now has, and the lack of detonation at higher boost levels.)

Andre

EDIT - The capacity is determined by the bore of the cyl and the stroke of the crank. Since neither was changed the "CC's" remains @ 2200 or 2.2 liter
Sorry for ALL the bad spelling!!

Sorry one more edit - If ALL the electics are sorted and the fuel system are capable, I feel I can SAFELY run 18 psi on everyday pump gas 24 to 26 psi (with my set up) on special "blended" gas.

[This message has been edited by Andre Vandenberg (edited October 19, 2000).]

[This message has been edited by Andre Vandenberg (edited October 19, 2000).]
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Old 10-19-2000, 05:05 PM   #8
Cacophony
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Out of curiousity.. anyone know if the 99 SOHC heads bolt up to the ej22t block?

How much of a pain in the ass is this to do, Andre?
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Old 10-19-2000, 05:09 PM   #9
ColinL
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Of course they do. You can also take headers off a 1.8L and bolt 'em up to an STi or a 2.5RS. Unfortunately that is probably the reason one of the exhaust ports is shrouded... Damned backwards compatibility!
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Old 10-19-2000, 05:52 PM   #10
WhiteCoupe
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I'm dooing a weird "mix" presently...

I put a ej18 intake, harness, sensors..on a ej22t engine (Block, Heads, Turbo).. it fits perfect....(Physically)...I kept the ej22t fuel rails and injectors...The engine is ready to put in the car...(The car is not ready to receive the engine , it's at the body shop). I Hope the 1.8 ECU will do the job...I will upgrade later with something like S-AFC or ....

I'll give you some news...

Thanks

Martin
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Old 10-19-2000, 09:43 PM   #11
markus
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Question

Won't the EJ25 head be overbored for the 2.2 block? Won't that leave some sort of weird squish zone at the edges? Does some welding work need to be done to fill this gap in so the 2.5 head and 2.2 block mate properly? Also, hasn't it already been shown on the CObb Tuning site that the SOHC EJ25 heads have the best flow capability of all the current heads. Why not just put the SOHC EJ25 head on the EJ22T short block?

Just curious.
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Old 10-19-2000, 09:44 PM   #12
Andre Vandenberg
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If you look at the piston difference between the MY 98 and MY 99, I think it will be safe to say that your compression will be lower with MY 99 heads on an EJ22T short block, than with MY 98 heads.
Otherwise, everything else should be the same amount of pain in the a$$ to accomplish a fairly similar end result!

Andre
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Old 10-19-2000, 11:12 PM   #13
WRXwannbe
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andre,

when you mean lag, at which rpm does the turbo start to kick in? If it's like 3500 thats way to much hehehe 99 sohc heads are hella hard to find used. But new ones will run about 500 a peice.
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Old 10-20-2000, 07:23 PM   #14
Andre Vandenberg
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With the stock MY 98 2.5 there was almost NO lag. You could hear the turbo wind up at 1800 RPM, and could feel it at 2200 RPM. No I start to "feel" it around 2500 RPM,but I also had to up the boost to get the same Speed over distance numbers.
I think the SOHC heads will be a LOT easier to fiend than the DOHC heads though.
Yes, the bore on the 2.2 cyl is smaller that the 2.5. But if you use the 2.5 steel gasket, it is so small that it does not affect the "squish" area. If the gasket was more than 1.5 mm thick, it would have left a big enough gap to interfere, but it's not.
I would say that if you already have SOHC heads, just put them on the EJ22T short block BUT keep in mind that your compretion will be WAY lower than if you go with the DOHC heads. Again, it depends what you want as a end result. If you are gonna high rev and high boost (20 + lbs) go with the SOHC heads or get a Honda otherwise go with the DOHC heads.
Andre
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Old 03-10-2007, 11:41 PM   #15
xxbrycityxx
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Andre Vandenberg..if you could send me some more info on your set up, that would be great. I just cant find anyone who knows what the best set up for a ej22t with ej25 head.
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Old 03-11-2007, 12:03 AM   #16
zavier
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holy grave diggers batman...
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Old 03-11-2007, 09:43 PM   #17
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WHO bumped this thread? I was just looking for this info and googled an EJ22T/EJ18 hybrid block and it took me here. What a BIG ass coincidence. Sweet info by the way!
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Old 03-11-2007, 10:41 PM   #18
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Very funny indeed.
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