What does your tuner recommend?

With that much boost he/she will probably recommend at LEAST a one-step colder plug.

 

I have not tried asking... they're the type of place that would charge for that info lol... also the previous owner had the car tuned not my self.

 

Probably one step colder NGK Iridiums.

These: Iridium 1 step colder plugs - 2.0 turbo

Part # BKR7EIX

I got mine from NAPA awhile back, but TiC has them for a good price and ships fast as hell.

 

^^ exactly

 

so my engine being a 2.2 with bigger injectors will be okay with that size gap? like what would be the benefit of using a smaller or bigger gap? and the benefit of colder plugs(cleaner burn?)? I know I want to get some plugs that are going to burn some more fuel? because my car is alittle on the rich side possibly from the plugs being bad and they're simply not burning as much fuel as they should be... after this (they need to be done any ways), its time for a retune I want to get 400 horses to the wheels...

 

DO NOT TRY TO GAP A LASER IRIDIUM PLUG!! THey are pre-gapped and doing so will ruin the spark plug

 

You shouldn't have to change any gap on the plug. As far as I understand it... the gap on the plug should relate to the amount of electricity the coilpacks are sending through the plug, and the material that the plug is made out of. NGK does all of the research for you. Check the gap, but don't adjust it. If the gap is incorrect... then send the plug back.

 

Kevin is right... the gap has to do with the discharge voltage, combustion chamber size and shape, and quench volume. However, since you are running a bored block, the combustion volume has undoubtedly changed, so you might need a different gap.

its time for a retune I want to get 400 horses to the wheels...

What's done to your transmission? At 400whp, your drivetrain won't last the trip down the driveway...

 

I thought the gap had some thing to do with how much electricity there was to burn fuel? (I'll go back to the STI forums and find...)

 

My understanding is that it has more to do with the voltage of the coilpacks, the material the plug is made out of, and the compression of the engine. If your engine builder was smart, and did things right.. your CR (Compression ratio) should still be between 8:1 and 8.5:1. So the plug gap from NGK should be correct.

Do you know your compression ratio?

 

I am not sure... I will find out tomorrow should I get that from the shop that built the engine or the shop that tuned it?

 

if you can find out the specs of your engine... we should be able to figure it out.

 

what do you need to know?

 

cylinder bore, piston stroke, headgasket bore, compressed headgasket thickness, individual combustion chamber volume, dish volume, and deck clearance.

 

its making 360 at the wheels right now, it has an 05 transmission from a WRX with different clutch and flywheel

 

its making 360 at the wheels right now, it has an 05 transmission from a WRX

Wow... I'm surprised it's holding on that transmission. The tranny was hardly changed between 2003 and 2005, besides 1st gear synchro and 3rd gear synchro stop. I'd be even more surprised if it holds at 400 whp (which is probably 350+ wtq)

 

Well this is all they could tell me, sorry it took so long I'v been very busy with work/school.

Bearing Clearances:

Mains
1) .0015”

2) .0015”

3) .0018”

4) .0018”

5) .0018”


Rods
1) 2.0468 - .0013-.0015”

2) 2.0468 - .0013-.0015”

3) 2.0468 - .0013-.0015”

4) 2.0468 - .0013-.0015”


Piston to Wall Clearance:
1) .0035”

2) .0035”

3) .0038”

4) .0038”


Piston Ring Gaps:
1 Top – .020
1 Bottom - .022
2 Top – .020
2 Bottom - .022
3 Top – .020
3 Bottom - .022
4 Top – .020
4 Bottom - .022