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Old 09-27-2001, 04:44 AM   #1
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Default k, abotu to install my EJ22T and have some more question

I know I have been bugging this board with all kinds of questions about my engine swap but I want to make sure I have as many basses covered before I start. so,

1) I am guessing that since I am going from a 2.5L engine to a 2.2L engine the engine will have less of a tendency to run lean because the fuel maps are for a 2.5L engine. is this correct?

2) Has anyone ever figued out the CR for an EJ22T motor with EJ25 SOHC heads? I asked a while back but no one knows. I don't want to err on my CR

3) With a stock EJ22T and 2.5L heads, what boost should I start at (T-03 turbo) to be safe. I'm guessing safe is around 250hp with this setup and no electronics.

4) What exhaust size does everyone recommend with a 2.2L turbo engine lookign at around 280-300hp? 2.5"?

5) and last, how much boost/hp is the stock valvetrain good to? I have read reports that running to much boost in our engines causes the valves to stick open longer than they should (because of the pressure). how much rpm's is it good to?

Thanks a bunch!

Eric
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Last edited by Eric SS; 09-27-2001 at 04:50 AM.
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Old 09-27-2001, 10:48 AM   #2
STiShawn
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oh boy where to start..

you really should run the ej22T ecu, not the ej25 with band aids for this, but what electronics are you running?

exhaust, go 3 inch

If you can afford it, get the COBB dual valve springs for your heads, an ej22 can run lots of boost, you MIGHT get valve float or lift..
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Old 09-27-2001, 11:57 AM   #3
Audipwr1
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You want to be careful about choosing a 3in exhaust. The larger doesnt always mean more power. For a Turbo charged engine, you should look into the exhaust presure bewteen the two different sizes. Im not positive that it needs to be a 2.5 in, but again only somone who has dynoed the two different exhaust setups would know.
Good luck
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Old 09-27-2001, 12:16 PM   #4
zaidallas
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Location: Expected whp/torque at 25 psi : 450
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If I remember correctly , when shiv had his dyno day tuning several rs-t's , all where running about 8 psi , the ones with the 2.5" DP's had like about 20 lbs/ft torque more than the guys having 3" DP's. however this only applys for boost levels less than 12 psi or so. once you go over 14 psi , a 3"DP and a 3" catback will be defenitely better.
zaidoun
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Old 09-27-2001, 12:36 PM   #5
STiShawn
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I just said exhaust...not DP's. I run a 2.5" dp and 3" cat back.
DP's you do want a bit smaller to keep some back pressure beside what the turbo provides, keep some low end torque. After that though, personally I would not run anything smaller than 2.5".
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Old 09-27-2001, 04:02 PM   #6
MattC
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zaidallas,

Let me refresh your memory. The car with the 2.5" exhaust was converted to rwd. My car, with the full 3" exhaust was converted to fwd. Because of this my car faced a wall while Edwin's(rwd) was facing an open garage. To top all of that off, edwin is using a smaller trim T3/T04 turbo than I do. He was making his peak torque lower than I was, I believe around 3500rpms. My car on the other hand made peak torque all the way up at 4k. Conversely my car made peak HP higher in the RPM range.

What does this tell us? Simply that nothing. You can't compare our cars because there are way to many variables.

But, I did run a 2.5" downpipe to a 3" exhaust first. Full boost came at 3200rpms, and the power tapered off by 6000rpms. With the 3" unit I make full boost at 2800rpms, and the car wants to pull all the way to my 6300rpm redline. These numbers are basically the same regardless of the amount of boost. The EJ25 motors make great torque regardless of exhaust size. Its HP you want to improve, and I believe the 3" downpipe definitely improves it.

I haven't dealt with EJ22t motors enough to be able to give much of an opinion regarding exhaust size. Shik, a member here, loved his catless 3" exhaust on his early 90s Legacy turbo though.

MattC
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Old 09-27-2001, 05:18 PM   #7
zaidallas
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Quote:
What does this tell us? Simply that nothing. You can't compare our cars because there are way to many variables.
MattC

hmmm I see your point , hot air is no good. I myself think that a 3" DP is defenitely a better choice especially for high boost , thats why I'm going to 3" now at 20 psi . however if short on money or sticking with low boost , and a 2.5" DP is there already , then it'll be just fine but no less than that. however if he had to make a brand new one and high boost is a goal then bigger is better for sure.
zaidoun
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Old 09-27-2001, 07:18 PM   #8
Eric SS
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2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Default

ok, so any other input on my questions before we get off on too much of a tangent _

Eric
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