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View Poll Results: Do you have a TBE and gutted uppipe (or more) while running the stock WRX ECU?
Yes 22 70.97%
No 6 19.35%
What's an ECU? 3 9.68%
Voters: 31. You may not vote on this poll

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Old 05-10-2005, 12:40 PM   #1
boxxxer
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Default Who is running TBE + gutted UP (or more) with WRX stock ECU?

In the EM forum there have been some questions raised about the stock ECU vs aftermarket engine management.

I'm curious to see how many people are running mild mods with the stock ECU on a WRX (not STI) and if there have been any problems.

Please feel free to list the year of your ride and all mods with commentary on your experience before and after
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Old 05-10-2005, 12:42 PM   #2
UGotBoost?
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I was running this setup without EM for nearly 20K miles.

Catless Uppipe/Downpipe, Prodrive Axleback, IC hoses, K&N panel filter, Assorted BOV's.

Never had any problems other than 1 random P0420 (I've got the MIL Elim in place). I've added Cobb's accessport... it's good.
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Old 05-10-2005, 12:58 PM   #3
I LOVE SIU MAIS
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My friend " Linkzard " on the board is running a up/dp combo setup without EM and his car is running great. You just need to have that mil fix thing. His car pulls hard and keeps up with my Cobb Stage2 Wagon till about 4th gear.

Cheers,

Siu Mai
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Old 05-10-2005, 05:39 PM   #4
The Deliverator
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I ran an up pipe and gutted downpipe for about 3-4k miles. For all the hassle it was to install them, I didn't really notice *any* gains.

Then I got my stage 2 accessecu reflash. Since then there's been plenty to notice. :-D
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Old 05-10-2005, 05:54 PM   #5
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Quote:
Originally Posted by stanh04wrx
I ran an up pipe and gutted downpipe for about 3-4k miles. For all the hassle it was to install them, I didn't really notice *any* gains.
That's really surprised me (and maybe other people as well). What I thought is when you deleted 1st and 2nd cat, you'll feel obvious improvement from buttdyno. Since you gutted your DP, I assume you deleted 3rd cat as well? So it is a completely catless setup.... how come you didn't notice *any* gains?
I'm asking this coz I may want to sell my AP to free up some cash, then until I get all parts for UP/DP install, I'll go straight for custom tune for EM...
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Old 05-10-2005, 05:59 PM   #6
The Deliverator
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I noticed some quicker spool, and a lot more wastegate noise... But not enough extra power to have made the installation debacle worthwhile. I'm sure that there must have been an increase in power, but it wasn't one that I could really feel.

Not fully catless, though. Kept the third cat. Don't want to stink.

I say keep your AP, run stage 1. When you can, buy a used solid up pipe for $100, gut your down pipe (easy; no welding required), get some 5-ply gaskets from gruppe-s for i think $50, and then you're at stage 2 for super cheap.
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Old 05-10-2005, 06:13 PM   #7
skivdz
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hello!
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Old 05-10-2005, 06:16 PM   #8
subenerd
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My 2002 has TBE (TXS w/highflow cat), catless uppipe and IC hoses. No EM. I have no CEL fixes, so every once in a while it will come on. When WOT hard shifting I will get the occasional afterfire (no flames) Ive been driving it like this since late December 04, about 5K miles.

Performance is much better than stock, except for gas milage...I dont know if its cause of my driving habits (cant stay off boost ) or cause its not tuned.
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Old 05-10-2005, 06:29 PM   #9
boxxxer
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Thanks for all the replies so far, keep 'em coming!

Last edited by boxxxer; 05-13-2005 at 07:16 PM.
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Old 05-10-2005, 07:23 PM   #10
scooterforever
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Engine management adds so much more power to the mix. You can run without, sure, but it's $650-$1000 that is very well spent. For example, with just engine management you can get to 260 hp at the crank. And with an UP and underdrive pulley with the stock turbo back you can get to 285 at the crank on 93 octane.

And if you are thinking of a bigger turbo, it's a must have.
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Old 05-10-2005, 07:31 PM   #11
fliz
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I've got an 02 w/ full manifold-back exhaust (1 high-flow cat) and turbo inlet, and no EM.

I haven't noticed any problems, and I was catless for a while last year.

I had an ECUTek tuned for 1 cat, and it was less able to adapt to the catless exhaust than the stock ECU was. I kept getting part-throttle boost spikes.

EM is definitely a good jump in power. Part of the reason I sold mine was it was just too much power for the driving I do. I live on country roads and like to run it through the gears. I found myself hitting "take-me-to-jail-and-tow-my-car" speeds too easily with EM. With the stock ECU, it really falls off above 5500 RPM, so it takes alot longer to top out third.

I also know of three other guys running similar setups (all STX auto-x'ers) w/o EM, and none of them have had problems either (all on '02s).
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Old 05-10-2005, 07:38 PM   #12
Synx
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I put down 215awhp on a dynopack with the following on 93octane on a cool day (about to rain) in GA:

Godspeed uppipe
Godspeed downpipe (removed center cat as well)
Stock resonator and axle back
MBC set to 14.5 PSI in 3rd (or so the dynopak reported)

It was around 220 tq iirc.
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Old 05-10-2005, 09:38 PM   #13
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Currently I am running a BPM TT turboback with 1 hi-flow cat in the midpipe, a catless APS uppipe, Perrin Short Ram and a TXS TMIC all on the stock ECU without any problems. Car runs great and pulls plenty harder then it did stock.
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Old 05-10-2005, 09:44 PM   #14
Jaxx
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the setup you describe will provide "loud stock like power"
get EM, it makes a HUGE difference
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Old 05-10-2005, 09:54 PM   #15
The Deliverator
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^^^^^^^

What Jaxx said. If you felt a gain by just doing the up pipe and tbe, get proper EM for it and you'll be so happy that you'll mess your drawers.
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Old 05-10-2005, 11:47 PM   #16
subaruwrx420
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I have been running stock gutted uppipe, stromung catless dp, stock third cat, 2.5" straight pipe from the third cat back, k&n panel filter, intake silencer removal...stock ecu. The install was definitely worth it! I did notice quicker spool times on the lower rpms and better response on the high end as well. The car pulls harder even on the highway. I have the resitor cel fix for the uppipe and the mechanical spark plug anodiser thing for the downpipe. I have thrown a couple of cels so far for the downpipe but that's it. I definitely feel the difference. Can't for EM though
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Old 05-10-2005, 11:58 PM   #17
Call_me_Tom
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Quote:
Originally Posted by subaruwrx420
I have been running stock gutted uppipe, stromung catless dp, stock third cat, 2.5" straight pipe from the third cat back, k&n panel filter, intake silencer removal...stock ecu. The install was definitely worth it! I did notice quicker spool times on the lower rpms and better response on the high end as well. The car pulls harder even on the highway. I have the resitor cel fix for the uppipe and the mechanical spark plug anodiser thing for the downpipe. I have thrown a couple of cels so far for the downpipe but that's it. I definitely feel the difference. Can't for EM though
^ This was the same story for me. I was very happy with it untill I went Cobb Stg 2 directly and I was amazed.
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