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Old 04-27-2006, 05:26 AM   #1
gimmewar
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Default need new plugs for 2.5l swap w/ wrx heads?

I thought I read somewhere that I may need new plugs for the 2.5l just wondering if there is any fact to that.

Also noticed a lot of discussion about which headgaskets to use to get the compression ratios correct, I am using standard wrx heads w/ the sti 2.5l which headgaskets should be used?

Thanks,
Mike
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Old 04-27-2006, 09:20 AM   #2
WhiteWoRX1
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Check it out here http://forums.nasioc.com/forums/show...ght=lfr7aix-11

As far as the headgasket goes, I am running an Axis 2.5 block w/WRX heads and got the Cometic Headgasket from Ron at Axis. It is an oversized 4 layer metal gasket. Not sure on the thickness, but I believe it brings the compression down to 8.5:1. Give Ron a call for the details. 314-865-4409
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Old 04-27-2006, 12:14 PM   #3
ShaggyGT
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Uhh, you use the same type of plug you used before the 2.5L swap. The plugs go into the heads not the block......
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Old 04-27-2006, 05:49 PM   #4
gimmewar
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I understand that shaggy, but because it's a 2.5l there's a possibility it may need a different one, I didn't know that's why I ASKED.

Mike
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Old 04-27-2006, 06:37 PM   #5
Ronin Quickblade
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I used the stock 2.5 STi headgasket with my 2 liter top end and my 2.5 bottom end.

I heard they are pretty much the way to go unless you want to spend extra money for no added guarantee. I'm 160 miles into my swap, things are going good. What turbo did you go with?
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Old 04-27-2006, 08:28 PM   #6
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Post in the right forum next time! Your correct choices would be Service & Maintenance and the Subaru Conversions Forums for your questions. Post appropriately next time dammit!
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Old 04-28-2006, 12:58 AM   #7
gimmewar
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I'm very sorry about that Unabomber (sincerely) I thought this was the best one. I thought conversions were more for huge swaps n stuff..but I guess that makes sense :idea:

Ronin Quickblade, vf30 I might get a 34 instead, I got the 30 as part of a trade to where out of pocket was only $200 for block/turbo..$300 for sti tmic, $50 for fuel pump, still need the pink injectors

Mike
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Old 04-28-2006, 11:55 AM   #8
V5-STi
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Try the following plugs: NGK PFR7B, gap at 0.65/0.70 mm, recommended by my tuner.
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Old 05-01-2006, 02:26 PM   #9
Skully
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i recommend you run 8's on heat range. 7's are only 1 step colder, and since you are raising your compression to 8.7:1 by using a STI bottom end + WRX heads. you will need the colder plug. Call advanceauto and tell them you need a heat range 8 plug from NGK. They can look it up in their NGK book.

-Thomas
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