Ask a tuner...

[T_woot]

Originally Posted by cosseywrx

/\ prolly a vacc leak

Anybody else have any insight? Suggestions?

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[P3Auto]

I would stick with a 7cm if you want to have quicker spool. Take a look around for someone else that has posted results of both variations to see what might match your goals.

Injectors if you are not using E85 could be 750-850 that should cover your requirements just fine.

Fuel pump is fine.

Seth
P3 Import Autowerks 907.355.6655

Originally Posted by Aron_WRC

Hello, Im currently building an 02 wrx. I have a stock ej20 that was just rebuilt with Arp head studs and race bearings, nothing really major... I have a GT2871r I want to put on, should I go with a 7cm or 8cm stock location turbine housing..or just get a custom flange to mate with the uppipe? What size injectors should I run? And I was assuming a walbro 255 would be sufficient?? and I'm going to run FMIC...and get a tune of course. Thank you :]

[P3Auto]

That would be about normal.

Originally Posted by T_woot

What is a typical negative boost number? 06 wrx with td04. Process west tmic, cobb sf intake, invidia catted dp with protune. Currently getting -10.4 as my lowest psi reading. Thanks.

[cosseywrx]

I would say -19 or so is normal. Ive never seen one higher than that at just idle.

[P3Auto]

He is asking about PSI not inhg. 19-21 inhg would be normal. -10.4psi converts to about 21 inhg which is what vac/boost gauges read.

Originally Posted by cosseywrx

I would say -19 or so is normal. Ive never seen one higher than that at just idle.

[Aron_WRC]

Originally Posted by P3Auto

I would stick with a 7cm if you want to have quicker spool. Take a look around for someone else that has posted results of both variations to see what might match your goals.

Injectors if you are not using E85 could be 750-850 that should cover your requirements just fine.

Fuel pump is fine.

Seth
P3 Import Autowerks 907.355.6655

Alright, thank you!!

[T_woot]

Originally Posted by P3Auto

He is asking about PSI not inhg. 19-21 inhg would be normal. -10.4psi converts to about 21 inhg which is what vac/boost gauges read.

Soooo normal not normal, thing to test. Thanks again y'all

[P3Auto]

Normal. There was confusion (I think) because most people look at vac readings in [inhg] not [psi]. I'm guessing your reading that negative psi reading from your cobb or data log software not a gauge.

However, if you want to see signs of a vac leak on your car specifically take a look at fuel trims. A leak will cause trims larger then say +-(6$-8%). Look at the values at idle for long and short trims. Other signs could be poor idle, harder starts, things like that.

Originally Posted by T_woot

Soooo normal not normal, thing to test. Thanks again y'all

[breezeby]

Question for you, do you know anything about CEL p0011?? What the cause is and how to fix it? 06 wrx it keeps going on and off.

[cosseywrx]

There is a cel thread

[bjcarter2]

Originally Posted by breezeby

Question for you, do you know anything about CEL p0011?? What the cause is and how to fix it? 06 wrx it keeps going on and off.

Try reading through this...

http://forums.nasioc.com/forums/show....php?t=1887590

[breezeby]

I ended up finding that. Thank you Hope I figure this out

[T_woot]

Anybody have any input on how engine mounts hold up for 06 07 models?

[cosseywrx]

Stock is stock. 100k or so and they will prolly need changing. I run Tigwerks solid mounts. Solid mounts are my preference tho.

[flobro92]

so ive been looking at cbe systems for my 2013 hatch, and from what i can see is that roughly all of the aftermarkets ie cobb and invidia cost approx the same with relative gains... i asked around and went to muffler city downtown anchorage and they said they could build me a custom cbe for roughly 600-700. my question is is there anything i should be weary about? i mean its about half the price of the cobb and invidia systems which is good but will i get the same relative gains and such? or would it just be better to pony up the cash for a invidia or cobb?

Thank you in advance!

[_davin]

If it's only a catback than you're just doing it for the sound. I'm not saying that as a bad thing, but until you have an aftermarket downpipe and are pushing a lot more power than you're only making the rumble a lot louder. If you don't care about the sound than spend the money on a downpipe and a tune.

[cosseywrx]

/\ i concur

[flobro92]

sorry i shouldve specified that im currently waiting for my catless dp to come in. should be here within the next week or so. ok just to make sure im understanding correctly it doesnt matter if i get it built or ordered from cobb etc? im not too sure if the dp changes anything at all. sorry im a newb lol

[_davin]

You can't install the downpipe without getting tuned for it. Seriously, you won't gain any power and might **** up your car. The cbe doesn't matter, the dp does. Make an appointment with one of our local tuners before you install it.

[tribalwrx]

Spend the money on the premade catback , saying that section of the exhaust isn't important isn't exactly correct. If its "custom made" and not done correctly it can and will hurt performance.

You can't go wrong with either cbe from Cobb or Invidia

[_davin]

Right sorry, I guess that wasn't very clear. I just meant if he was only looking for power gains he might as well leave it stock, that being said though we all enjoy a good rumble. I would recommend nameless performance, you could order an axle back now for sound and then upgrade with their midpipe for less restriction later.

[P3Auto]

The gains are found in the down pipe not the cat back system in most cases, at least in the case of a stock turbo setup.

You may want to start with a downpipe and a tune and see if your happy with the sound and the performance. Doing the cat back after the downpipe will change looks and sound of course but unless there was something wrong with the existing system you wont feel any difference. We have verified this several times with before and after dyno runs.

Call around a bit on the exhaust systems. Our shop can get full name brand cat back systems for around the cost of what the local shop claims to be able to build one for. A good invidia or equivalent downpipe can be had for cheap if you shop around as well. Keep in mind if you plan to move to a state with emission requirements then you might want to stick with a high flow catted downpipe(they cost almost double however but not quite!).

Seth
P3 Import Autowerks 907-355-6655

Originally Posted by flobro92

so ive been looking at cbe systems for my 2013 hatch, and from what i can see is that roughly all of the aftermarkets ie cobb and invidia cost approx the same with relative gains... i asked around and went to muffler city downtown anchorage and they said they could build me a custom cbe for roughly 600-700. my question is is there anything i should be weary about? i mean its about half the price of the cobb and invidia systems which is good but will i get the same relative gains and such? or would it just be better to pony up the cash for a invidia or cobb?

Thank you in advance!

[T_woot]

I disagree that they cost double but they are a bit pricier for a catted dp.

[P3Auto]

Yes your right I should have said almost double...

Originally Posted by T_woot

I disagree that they cost double but they are a bit pricier for a catted dp.

[exogen]

Dunno if this is really a tuner question but what would these work fine on my wrx? Mine are currently bent and need to be repaired.
03 wrx sedan

http://www.rallysportdirect.com/Eiba...teral-Link-Kit

or

http://www.rallysportdirect.com/Whit...ster-1998-2002