2.5L Swap Info - Subaru WRX Forum
 
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post #1 of 9 Old 09-25-2006, 03:24 AM Thread Starter
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2.5L Swap Info

I plan on swapping to a 2.5L short block and was looking at these helix injectors from gruppe-s for a wrx and was wondering if they would also fit on the new block. Or should i just buy the ones for the sti? http://www.gruppe-s.com/Subaru/subeng.htm They are the 820cc and 860cc helix injectors at the bottom of the link.
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post #2 of 9 Old 09-25-2006, 11:02 AM
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If you're using a large turbo, then yes, go with big injectors. You will, of course, need EM to make it work right but that's a job for your tuner.

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post #3 of 9 Old 09-25-2006, 09:40 PM
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They will be great if you plan to do the GT35R that you asked me about..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #4 of 9 Old 09-26-2006, 12:08 AM Thread Starter
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Will it matter if i get side feed or top feed injectors for the 2.5l block?
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post #5 of 9 Old 09-26-2006, 12:19 AM
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I want a GT35R kit so bad. I keep looking around my apartment for stuff to sell... Anyone want to buy a Plasma?

'06 WRX STi
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post #6 of 9 Old 09-26-2006, 12:31 AM
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The block isn't what determines what injectors you use are.
I'M having a brain fart but i think the Wrx is side feed and Sti is top feed i know if I'm wrong someone will tell me.
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post #7 of 9 Old 09-26-2006, 12:51 AM Thread Starter
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thanks trauma, aren't you in the middle of a 2.5L swap too? Will every thing bolt right up like water pump, oil pump and whatever else? I will probably get new head studs and gaskets. I am still debating CP forged pistons since i only plan to keep the block for a year or so.
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post #8 of 9 Old 09-26-2006, 09:21 AM
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Yea it will all bolt up I'm replace everything just because the motors apart and i might as well put all new stuff while its out. I know people have said do new head studs but after talking to alot of people over it the Stock sti one are fine unless your trying to build a beast of a motor then go ahead and replace them just remember you have to tighten them after i think its 1000 miles or so. As for the head gasket use either the Sti one which i think is .021 mm or the 2.5rs gasket which is .051 again i think those are right either way the STi one will give you a higher compression around 8.8:1
The 2.5rs gasket will give you a lower compression of 8.4:1
I can get you the actual part number if needed. I'm going with the 2.5rs gasket due to hopefully going a 20g here soon after the swap is complete.
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post #9 of 9 Old 10-09-2006, 03:36 PM
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About the injectors, The STI uses Side feed and the WRX uses the top feed. If you are just replacing the short-block, you will use the top feed injectors. The fuel rails are what determines the injectors, as well as the pig tail on the wiring harness.

I am running a Crawford S2 (2.5L STI block, STI forged Crank, STI Forged Rods, with CP Forged Pistons) and WRX Heads. The compression can be pulled down with the right set of pistons. I am running the WRX heads setup from CP which with the STI head gaskets, gives me an 8.1:1 compression ratio. On top of this I am running the FPGreen, which makes for one torque monster. I am considering going to a GT35R within a few months, once I finish building the Transmission that I blew a few months back.

If I can help anyone out with anything, feel free to let me know.
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