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Old 08-10-2012, 05:57 PM   #1
CatRover
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Join Date: Jul 2012
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99 rs25

Default A few 22t swap questions

Yes, I'm fairly new to the site. What better way to join the community than ask a bunch of questions.

I've recently acquired most of the parts for my build, including my 99 rs shell which is currently sitting in the garage on jack stands with the cross member out and dash gutted.

My plan, as of yesterday, is to swap in a 22t block that I just picked up.

Specs on 22t as of now -

-Forged internal ej22 bored and stroked to ej24
-STi 79mm crank and rods
-ACL race bearings
-ARP rod bolts
-Custom 98mm Wiesco piston kit with coated skirts
-Machined block halves
-STi crank machined for phase I thrust bearing

Now for the questions. I'm a some-what confident mechanic, but have never been into any sort of build like this. I plan to have a machine shop finish the engine as soon as I acquire the rest of the parts I choose.

1. What heads would you recommend? I've got an entire 02 WRX wagon parts car. My thought process was yank the heads (177k miles), STi cams, have the heads ported, and call it a day.

1.33. Say I do use the WRX heads as mentioned above, which head gaskets?

1.66. If I chose the above option, would I be sacrificing potential power the block is capable of? I hope to be in the 320hp range.

1.99. Timing components (belt, tensioners, water pump, etc) for ej205 or ej22t?

2. Turbo. I plan to run 800cc injectors as I have a set. I don't see the stock WRX turbo being sufficient. Maybe something along the lines of 18g? vf34? WRX has a fmic I'd like to use on the rs. Hoping that's possible with whatever turbo I choose. Again, I'm new to the scene. There's only one way to learn. Ask lots of questions, and attempt as much work as I'm comfortable doing.

3. I've heard a few horror stories of closed deck blocks running hot. Any certain radiator recommended to run?

4. I've considered running the WRX trans in my rs, along with the rear diff. Here's the only specs I have with the trans. "Hybrid trans, '03 2.5TS transmission with a '02 WRX front case. Shorter ratios, stronger gears, bolts onto any '02-'05 WRX. " Would it be worth my time, or should I just rock the rs 5mt until it gives, if ever? Currently has 170k. If I decide to run the WRX trans, is it a direct fit?

5. I know this has been killed in previous threads, but seems how I'm already making my own... The WRX cross member will be a direct bolt on to my rs, correct? Other than replacing the WRX rack with the rs, is there anything else that should/needs to be swapped? Should not need to shim anything?

6. WRX exhaust basically bolt onto the rs? Well, hang on?

7. I know a Walbro 255lph pump is recommended, how about the sending unit and pump out of the WRX instead?

8. Should a stock STi oil pump be sufficient? Is it a direct bolt on?

9. I plan to have the harness merged from iWire. Is there anything specific with this build I shouldn't forget to mention?

That's all I've got for now. Trying to educate myself as much as possible before digging in. I honestly appreciate anyone who takes the time to read thru my 12 questions, and answer any at the best of their abilities.
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Old 08-10-2012, 07:35 PM   #2
RallyColtTurbo
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Three Gen 1 Legacy Turbos

Default

Quote:
Originally Posted by CatRover View Post
1. What heads would you recommend? I've got an entire 02 WRX wagon parts car. My thought process was yank the heads (177k miles), STi cams, have the heads ported, and call it a day.

Heads to match whatever engine control you plan to use.

1.33. Say I do use the WRX heads as mentioned above, which head gaskets?

Gaskets to match your block, AKA EJ22. Thickness determined by your desired compression ratio and quech height. If your pistons are custom, then whomever designed them must have also specced a head chamber size and gasket thickness.

1.66. If I chose the above option, would I be sacrificing potential power the block is capable of? I hope to be in the 320hp range.

EJ22T is old school thinking, no real world advantage over a properly specced semi-closed deck motor. 320 would be fine on an open deck.

1.99. Timing components (belt, tensioners, water pump, etc) for ej205 or ej22t?

Match your head choice.


2. Turbo. I plan to run 800cc injectors as I have a set. I don't see the stock WRX turbo being sufficient. Maybe something along the lines of 18g? vf34? WRX has a fmic I'd like to use on the rs. Hoping that's possible with whatever turbo I choose. Again, I'm new to the scene. There's only one way to learn. Ask lots of questions, and attempt as much work as I'm comfortable doing.

3. I've heard a few horror stories of closed deck blocks running hot. Any certain radiator recommended to run?

Spec your radiator the same as any other build of the same HP. Close deck overheating is greatly exagerated.

4. I've considered running the WRX trans in my rs, along with the rear diff. Here's the only specs I have with the trans. "Hybrid trans, '03 2.5TS transmission with a '02 WRX front case. Shorter ratios, stronger gears, bolts onto any '02-'05 WRX. " Would it be worth my time, or should I just rock the rs 5mt until it gives, if ever? Currently has 170k. If I decide to run the WRX trans, is it a direct fit?

5. I know this has been killed in previous threads, but seems how I'm already making my own... The WRX cross member will be a direct bolt on to my rs, correct? Other than replacing the WRX rack with the rs, is there anything else that should/needs to be swapped? Should not need to shim anything?

Your 'bolt in' crossmember is a '91-'94 Legacy turbo one or a "GC" WRX one. A USDM WRX one will work if you also use the WRX wagon control arms. WRX sedan control arms are wider (search for details). Older control arms need shims on USDM WRX crossmembers. Front sway bars are turbo specific, so get it with your crossmember. There are also a few steering rack 'gotchas' to look out for, but if you stick with '02-'04 (or older) stuff there will be no suprises.

6. WRX exhaust basically bolt onto the rs? Well, hang on?

7. I know a Walbro 255lph pump is recommended, how about the sending unit and pump out of the WRX instead?

WRX ECU/wiring requires the WRX fuel pump controller. IIRC, you can use your original sender. Remember, head choice determines ECU/wiring choice.

8. Should a stock STi oil pump be sufficient? Is it a direct bolt on?

9. I plan to have the harness merged from iWire. Is there anything specific with this build I shouldn't forget to mention?

That's all I've got for now. Trying to educate myself as much as possible before digging in. I honestly appreciate anyone who takes the time to read thru my 12 questions, and answer any at the best of their abilities.
I'm a Legacy guy, but here is help on some issues.
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Old 08-10-2012, 08:21 PM   #3
CatRover
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Default

Quote:
Originally Posted by RallyColtTurbo View Post
1.66. If I chose the above option, would I be sacrificing potential power the block is capable of? I hope to be in the 320hp range.

EJ22T is old school thinking, no real world advantage over a properly specced semi-closed deck motor. 320 would be fine on an open deck.
Thanks for the input. And by this question, it was more meant as "If I run ported wrx heads with sti cams, and I sacrificing potential power the block is capable of with a different head setup?" I've already got the 22t block and parts mentioned, no turning back now! Hoping to get 320hp from this setup.
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Old 08-12-2012, 08:32 PM   #4
CatRover
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Hoping for a little more response.
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Old 08-12-2012, 09:52 PM   #5
ToneWrx02
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You can get the power you want, just make sure to keep the system cool and you will hit ur goals
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Old 08-12-2012, 09:56 PM   #6
ToneWrx02
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Sti oil pump would work, för ur power goals u need a 18g turbo, try going bigger injecotrs and use e85 if available it will help reach ur goals easier and safer. Sti top mount intercooler will e more then enough för ur goals.
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Old 08-12-2012, 09:57 PM   #7
ToneWrx02
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Just use the trans u got för now and save up för a 6speed swap,
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Old 08-12-2012, 09:58 PM   #8
ToneWrx02
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As för exhaust yes it should just bolt on, and just buy the walbrp pump, it will save u a huge risk of ur pump dying on you when reving 7k. Rpms
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Old 08-12-2012, 10:05 PM   #9
CatRover
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Default

Quote:
Originally Posted by ToneWrx02 View Post
Sti oil pump would work, för ur power goals u need a 18g turbo, try going bigger injecotrs and use e85 if available it will help reach ur goals easier and safer. Sti top mount intercooler will e more then enough för ur goals.
Is STi oil pump a dircet bolt on? I've read previous postings about oil pumps needing to be "shimmed". e85 is available, is that something I should safely be able to run at a 50-50 mix with premium, or even higher? And I've already got a front mount on the wrx I'd like to use if possible.It's currently set up for the stock wrx turbo.
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Old 08-12-2012, 10:30 PM   #10
ToneWrx02
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Shim is just supposed to help it flow better i believe, if u worried about the flow get a jdm sti pump. 12mm,

Stock turbo will not get you to ur goal, also no just use e85 not mix, mixing gas will get different effects each time unless u Can test it
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Old 08-12-2012, 10:55 PM   #11
CatRover
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I have no intentions of using the stock turbo, just mentioned the fmic I have is currently set up for it. e85 should run with no worries given it's tuned? I'll search that question a bit.
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Old 08-13-2012, 09:24 AM   #12
ToneWrx02
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If its tuned on e85 u will have no problem
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Old 08-13-2012, 01:42 PM   #13
CatRover
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I'd like a rear lsd, and am willing to sacrifice the 4.10 gears by swapping the rear diff and trans from the wrx. Will I just need the trans, drive shaft, and rear diff? Should the rs axles work?
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Old 08-13-2012, 03:24 PM   #14
subieguy87
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Quote:
Originally Posted by CatRover
I'd like a rear lsd, and am willing to sacrifice the 4.10 gears by swapping the rear diff and trans from the wrx. Will I just need the trans, drive shaft, and rear diff? Should the rs axles work?
Yes, they'll work... Had that issue myself a while back

Also, the rs should have an LSD
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Old 08-13-2012, 03:32 PM   #15
CatRover
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I was under the impression 99's were open diffs, 00 and 01 where lsd.
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Old 08-13-2012, 03:48 PM   #16
subieguy87
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I thought it was all rs'
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Old 08-14-2012, 01:07 AM   #17
geronimo81
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Quote:
Originally Posted by ToneWrx02 View Post
As för exhaust yes it should just bolt on, and just buy the walbrp pump, it will save u a huge risk of ur pump dying on you when reving 7k. Rpms
Exhaust hangers need to be moved, but not too difficult

Quote:
Originally Posted by ToneWrx02 View Post
Shim is just supposed to help it flow better i believe, if u worried about the flow get a jdm sti pump. 12mm,

Stock turbo will not get you to ur goal, also no just use e85 not mix, mixing gas will get different effects each time unless u Can test it
Shims are for raising base oil pressure. Larger pumps are for greater flow.
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Old 08-14-2012, 09:43 AM   #18
subieguy87
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Quote:
Originally Posted by geronimo81

Exhaust hangers need to be moved, but not too difficult
Could you be more specific? On the axle back? Front or rears?
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