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11-27-2007, 07:29 PM | #1 |
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Vehicle:2002 WRX Wagon - WRB 2005 9-2X - SGM |
STX Power
I probably should start with an explanation of what I already have (engine wise):
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11-27-2007, 09:24 PM | #2 |
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get a catless uppipe asap. technically, the stock heatshield has to stay (but only if your a stickler). The rest looks good.
Suspension probably should be looked at first for stx. |
11-28-2007, 02:17 AM | #3 |
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11-27-2007, 09:45 PM | #4 |
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With a good tune (or none at all IMO) you'll gain a LOT from some of the mods that common NABISCO "wisdom" says don't make a difference or is a bad idea. Intake makes power across the power band if your tuner has a clue. Turbo inlet pipe makes a noticeable difference. Do your research, there are about a million threads with total crap in them on NASIOC and about three threads with worthwhile actual truth information. Take a look at the setup of the top fully built cars and while you'll find differences between us you'll not find any of us using a stock intake.
As mentioned your heat shield is not STX legal. If you still drive the car on the street I'd skip the cross-pipe since mild steel doesn't look pretty after one winter in the salt and will likely be see-through after a single winter if you do a lot of driving on MI salted roads. I'd do the PnP myself since you can do a much better job yourself if you've got time and patience. The uppipe is a given and I'm not positive that the Perrin setup will actually stay O2 CEL free on every car. Or you could just buy one of the three National event winning STX WRXs that are currently for sale for WAY less than they cost to build (including ours) and not have to do all the testing and research yourself. |
11-28-2007, 11:00 AM | #5 | |
Merci Buckets
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To the OP...where are you in MI? I apparently have one of the few National event winning WRX's that isn't for sale. If you're near me you are welcome to take it for a drive sometime. You really don't need two engine maps. I make more power on an STX tune than I did on an old stage 2 tune. Its more than enough fun for a daily driver. |
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11-28-2007, 11:55 AM | #6 |
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I would second that money is better spent on suspension. The best you can afford, weight reduction, then power.
With that said, I am going to see if I can get some people interested in getting Doug from Topspeed to come back to Toledo for tuning next spring. If you think you're interested PM me. Many people are happy with his results, and I think he's one of the few who gets STX. There are very few tuners in the Mid-west I would go to, most I wouldn't let tune my lawnmower. If you're truly interested in STX, a SM map will gain you basically nothing, the little snail's huffing all it can huff. It's true that it's technically illegal to run a boost base map and switch to a STX real time. If it were me: Get someone else's exhaust manifolds cross over pipe and port them, with the money you saved have them coated at a place like this www.swaintech.com . Most of the time these can be had for free from someone who has went to headers, which I consider not the right choice for STX. Unless some one actually did the research and made smaller diameter headers. You will lose around 18lbs by porting and removing heatshields. I ran a gutted factory upipe for a long time and really think there's no performance advantage to an aftermarket one, in STX. Again cheap. You would be better off starting with a dual cat system, but my Cobb DP has been in ready state for awhile now. Mufflers? I don't like them, my turbo's my muffler. I would echo that prior to tune look at intake and turbo inlet. I think Phil/Jason both have Blitz intakes. I have an APS long intake, moto gp inlet. Greg |
11-28-2007, 05:03 PM | #7 | |
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Jeff Barco's 2006 Nationals winning (and 2nd place) car used the stock intake and inlet. This caused me a lot of indecision when I was trying to finish my mods. I went halfway and got a cheap Samco inlet before my tune. |
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11-28-2007, 09:05 PM | #8 |
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11-29-2007, 07:08 AM | #9 |
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Thanks for the replies guys. Some great points there.
I wasn't aware of the heatshield rule. If an aftermarket heatshield is not allowed, then what is? Are people cutting up a stock heatshield to fit over an aftermarket downpipe and does this then meet the rules? Can you buy one from the dealer separate from the pipe? I like to keep all the original parts to my car. The egt sensor in the up-pipe is obviously not needed functionally if the cat is removed, so what are people doing to meet the rules? Run the sensor anyway? Does it need to actually enter the flowstream or is it okay to add a closed stand-off fitting? As for the intake and inlet pipe, the cost seems pretty high for ~2 hp. What about increased inlet temperature of using a shorty inlet? Some are available with an airbox that draws from the wheelhouse. Is that preferred? How about just a better flowing panel filter and a resonator bypass, would that not be just as good? As for the downpipe, I'm not sure if I should try it out with my current catted Cobb. Is there a test I could run to see if I will get CELs? It's alot easier and less expensive to keep it rather than changing over to a Perrin or Random Tech. dual cat setup. |
11-28-2007, 09:53 AM | #10 |
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I'm pretty sure the catless uppipe will have to have a bung for the egt sensor (it's part of the OBDII emissions system)- not all catless uppipes have this provision (my STi uppipe does not )
I'd also consider doing the P&P yourself on the maniflods/cross over- I had mine coated- probably not overly necessay, but it looks pretty Here's a thread I started on exhaust setups that will (or in some cases won't) work for the new "clarification" http://forums.nasioc.com/forums/show....php?t=1364415 Tandem high flow cats w/ the O2 sensor rearward should work- Chris (FTD) used a setup like that (not Perrin) worked well- he also ended actually making more power w/ this setup vs a single catted 2.5" setup- not sure if it was an improved tune or going to 3" or a combination of the two. Phil- interesting on the intake, I've also always "heard" not much, if any, difference in power. What intake were you running? Mike |
11-28-2007, 02:44 PM | #11 |
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^ maybe I'll just gut my stock uppipe- would be nice to save a little $ somewhere w/ this "clarification"
does Doug do Ecutek as well as AP? |
11-28-2007, 02:50 PM | #12 | |
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Quote:
http://www.topspeedsales.com/(ypfifi...)/default.aspx As a side note I've done nothing yet to add to your other exhaust thread. |
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11-28-2007, 03:35 PM | #13 |
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^ looks like a yes
what are you waiting for |
11-28-2007, 04:16 PM | #14 |
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Our tune was done by Doug and is an ECUTek tune. Our intake is a Blitz and we use the GP Moto inlet tube. Jason uses a Blitz but with a custom aluminum center piece and I'm not sure which inlet tube. Tom\Biggly used a K&N Typhoon on the car that Biggly now owns, it replaced the APC piece after some dyno testing was done if I remember right.
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11-29-2007, 09:34 AM | #15 |
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Tom means 2HP over the other intakes he tried not 2HP over stock.
You'd have to keep the EGT sensor in the exhaust stream. If you daily drive the car use the resistor and a plug for daily driving and then just put the sensor in for events to make it last longer. As for the downpipe you'll never really know until you try it. Each car behaves a bit differently so what works for one person without a CEL may not necessarily work for someone else. |
11-29-2007, 09:35 AM | #16 |
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you can modify the oe, yes it's available at the dealer
egt has to be installed (during the event anyways) neds to be in the stream from my understanding- some are just putting it in for the event, then removing that's my current intake setup- slincer elbow w/ a STi (non-oiled) panel- guess I'll have to do some homework on intakes if you currently don't have a tune and are not getting the cet inefficiency cel- sounds like it might be working, if you have a tune you'll need to get a new map that doesn't disable the cels for the cats. If you look at my thread linked above I believe someone commented on the Cobb that they were getting the cel (better double check though) |
11-29-2007, 09:44 AM | #17 |
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Phil beat me to the punch
I didn't realize Tom was talking 2hp over other intakes though- ballpark idea on hp/tq over a stock setup? |
11-29-2007, 10:50 AM | #18 | |
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07-07-2008, 03:58 PM | #19 |
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AHHH are you serious - EGT sensor must be installed in uppipe??!?!?
of course my uppipe has no EGT bung, I'm only running local events but still, what is the point of this, it seems like such meaningless beuracratic nonsense (seriously though, can someone tell me what this being illegal accomplishes?).... I also never knew that a stg2 basemap/stx real-time was not allowed; again, what is this violating? I admit that I don't know enough to know if this makes a difference... someone please tell me this is an old thread and these rules no longer apply, or at least that they don't give me any real advantage; at the events I run I'll probably never be protested (until someone finds this post) but I'd still like to know (if) I'm legit. Last edited by thereplacement; 07-07-2008 at 04:13 PM. |
07-07-2008, 04:12 PM | #20 | |
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07-07-2008, 08:32 PM | #21 | |
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Since I'm not fully prepped for STX w/ suspension or tires I'm now thinking about selling off and going back to stock... I def don't want to put more $$$ into it |
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07-07-2008, 04:40 PM | #22 |
Street's closed, pizza boy
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We have a pretty long thread about this FWIW
Sticky: AUTOX Super Thread 2008 http://forums.nasioc.com/forums/show....php?t=1202277 --> STX Setup / Discussion thread http://forums.nasioc.com/forums/show....php?t=1431201 --> "Power mods" section There is also a lot about the new exhaust rules in there, including the link Bigsky posted earlier. Sadly - the new rules are not going away any time soon, despite the inconsistencies, enforceability problems, etc etc. Yes it sucks. Locally I doubt anyone would care though. I know I wouldn't. But you should still tell your local STXers to see if they care. |
07-07-2008, 08:36 PM | #23 |
Street's closed, pizza boy
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Check out Bigsky's link. There are a few folks on single cat setups that aren't throwing CELs. I went the dual route so I wouldn't need to worry about it. The real test will come when I get ProTuned and find out how many hp that extra cat costs me.
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01-07-2014, 05:02 PM | #24 |
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Anyone interested in my ap with stx protunes??
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