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Old 08-15-2003, 04:36 PM   #26
drewzter
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Talking Who changed their Sti Stock exhaust already?

Quote:
Originally posted by peczenij
Put on my TurboXS cat back from my 2002 WRX.
It was like removing a cork. Lots more power.
I cannot believe it...

what he said.......too.....
except it was a new exhaust, I have had no spikes or creeping or any trouble with it. Just FUN .
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Last edited by drewzter; 08-16-2003 at 08:18 AM.
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Old 08-15-2003, 11:20 PM   #27
happasaiyan
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the hpbc is in.

results:
-boost hits pretty hard in 1st and 2nd.

-boost by gears:
--1- 1.050 bar
--2- 1.075 bar
--3- 1.100 bar
--4- 1.125 bar
--5- 1.200 bar
--6- 1.200 bar (only took 6th to maybe 4500rpms...)

-before the mbc, the boost would shoot up about .1 bar then settle back down. in 6th, it would shoot through the roof (1.3 bar), but i havent taken the car up that high again, so it could still be there, but i really dont think so. boost seems to be pretty stable, so im happy. im getting a little less boost than i was before the boost controller, but it spools quicker in 3-6th (full boost by 3000rpms as dan (god) reported).

-i dont seem to have any serious issues with PTFB. full boost comes on at maybe 80+% throttle. should keep the EGT's down to a sane level.

-if you have an aftermarket exhaust and intake, and are getting boost creep problems, i recommend getting a boost controller and capping that sucker.

-all in all, worth the money. now i wont have to worry as much about getting boost cut. also- i pretty much have the same car that dan dynoed at 300whp...actually, its pretty much identical now. now, just cant wait till some engine management comes out.
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Old 08-16-2003, 04:11 AM   #28
Kenneth2000
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At 400 or so miles, I installed the TurboXS - Turbo-Back Exhaust with the RFL Muffler ...

I love it. Definite power increase. It isn't for the faint of heart!

It's loud ...... !

Here's a video (watch out, it's 4.7 MB big)

http://www.need4speedpower.com/turboxs/stiturboback.wmv





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Old 08-17-2003, 12:34 AM   #29
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My STi is on the way and I want to change to Cusco DP with HKS Carbon Ti (got a good deal on a used ones)

Should I do it after the break in period or just go ahead and change it?

And also somehow I don't really like the idea of not using the main cat with aftermarket DP

Any advice?

Thanks...
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Old 08-17-2003, 12:56 AM   #30
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If it was me, I would bring the parts to the dealship and change them out while they workout all the paperwork!

Honestly, you will be fine changing them out right away, plus if you do, you wont have to reset the ECU to relearn the new exhaust.

Drive home, while the engine is still "tick'n" from being hot change everything out, no worries!


Now about the CAT, your car will run much much better without a CAT at all. Its a required piece of smog equipement, so just keep one, its all you will really need to pass emissions in most states.

I put on a BPM 3" Turbo Back Exhaust with a hi-flow 3" CAT. Now I wish I had NO CAT at all. Future plans include a 3" CAT-less test pipe for track days.
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Old 08-17-2003, 02:10 AM   #31
Leonardo
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Quote:
Originally posted by salaki
My STi is on the way and I want to change to Cusco DP with HKS Carbon Ti (got a good deal on a used ones)


Thanks...
if the DP is JDM, it won't mate up to the exhaust unless the exhaust is JDM as well. If the DP is made for USDM exhausts, have fun!!!
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Old 08-17-2003, 02:34 AM   #32
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The one that I have:

HKS CArbon Ti exhaust (used in WRX for a while) and welded to the Cusco DP.

(no cat - just straight pipe welded to connect DP and Carbon Ti - not a bolt on install)

But of course on the rear section of the muffler it is a bott on install.

Would I get any CEL?
I know this CEL fix made by rallyperformance.com for WRX that fixes the CEL code and still lets the ECU utilizes the OEM 02 sensor.

Would it work fine in my setup?

Thanks....
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Old 08-17-2003, 06:44 AM   #33
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i'm running blitz sus intake, nur spec cat back and invidia downpipe. i reset my CE light every two days, but it runs so strong no one around here can keep up.
i will install my MBC tomorrow though because I checked my peaks on my Defi's tonight and saw that sometime earlier my boost crept to over 18.4 psi and that's not the worst part...egts got to over 1780.
no more putting that off. i think i'm lucky i still have a motor.
byron
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Old 08-17-2003, 03:48 PM   #34
salaki
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Can you provide the CEL code?
Just wondering if this Cat efficiency or high EGT code?

Where do you install the EGT?

Anybody experience the same problem w/ only TBE (no intake) ?
Thanks...
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Old 08-17-2003, 07:28 PM   #35
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it's the cat. code. this is the first time i've ever run this high of egt's and only the second time i've seen over 890cel.(around 1600f). the ecu controls egt's pretty well normally. I was running pretty hard on the highway with my 2 other WRX friends(and the wife's MB kompressor), so i guess the long pulls in 3rd,4th, and 5th might have done it.

egt probe is centered under both passenger side cylinders. tapped in the bung myself. no leaks, no problems since i put it in.


I'm going to go put the MBC on now. hopefully it keeps everything safer.
byron





Slaki- the cel fixes and the pony express mil elim. don't work on the STI. if i had to it again i would probably get the godspeed downpipe because they don't trip the CEL
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Old 08-17-2003, 09:34 PM   #36
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Here is what I did to my Invidia DP to keep it from illuminating the CEL...

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Old 08-17-2003, 10:28 PM   #37
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dsmperformance, How does that prevent tha cel light? I was Ok for 200 miles then today after a 1/2 tank of 94 octane the light came on in stop and go traffic. The first two times it came on with trying to use the cruise controll. thanks jim
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Old 08-17-2003, 11:47 PM   #38
dsmperformance
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Quote:
Originally posted by euroauto
dsmperformance, How does that prevent tha cel light? I was Ok for 200 miles then today after a 1/2 tank of 94 octane the light came on in stop and go traffic. The first two times it came on with trying to use the cruise controll. thanks jim
The other DP's that have the integrated CEL fix use a similar fix. I think it has something to do with the O2 sensor being in direct exhaust flow and the extension pulls it away from the exhaust flow.
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Old 08-18-2003, 02:10 AM   #39
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stupid question, well my blitz nur spec cat back from my 02 wrx fit on the sti?
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Old 08-18-2003, 02:38 AM   #40
Janq
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Default Hard proof of performance?

Do any of you guys have any hard & real proof of before (stock) and after (exhaust & mbc mods only) power (HP and Tq) numbers?

Specifically I'm looking for postings of dyno run sheets.

I'm personally thinking to go with a turbo back but use the stock or lightweight 'quiet' muffler as I'll forgo a few bonus HP percentage points in exchange for a relatively normal/stock exhaust note. i need to be able to cruise my conservative neighborhood without setting off car alarms and waking up the napping BabyJanq.

This thread has been great to monitor and learn from but thus far I've only seen anecdotal 'butt dyno' results. I'd _love_ to see 300WHP (more so 300 WTq) results as long as they are real, reliable, repeatable and confirmable.

- Janq
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Old 08-18-2003, 08:28 AM   #41
happasaiyan
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Default Re: Hard proof of performance?

http://www.clubwrx.net/forums/showth...threadid=27403

300awhp. dyno plots are there, too.

Quote:
Originally posted by Janq
Do any of you guys have any hard & real proof of before (stock) and after (exhaust & mbc mods only) power (HP and Tq) numbers?

Specifically I'm looking for postings of dyno run sheets.

I'm personally thinking to go with a turbo back but use the stock or lightweight 'quiet' muffler as I'll forgo a few bonus HP percentage points in exchange for a relatively normal/stock exhaust note. i need to be able to cruise my conservative neighborhood without setting off car alarms and waking up the napping BabyJanq.

This thread has been great to monitor and learn from but thus far I've only seen anecdotal 'butt dyno' results. I'd _love_ to see 300WHP (more so 300 WTq) results as long as they are real, reliable, repeatable and confirmable.

- Janq
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Old 08-18-2003, 09:37 AM   #42
dsmperformance
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Default Re: Hard proof of performance?

Quote:
Originally posted by Janq
Do any of you guys have any hard & real proof of before (stock) and after (exhaust & mbc mods only) power (HP and Tq) numbers?

Specifically I'm looking for postings of dyno run sheets.

Here is some info on the TXS system. Dyno charts also...
http://www.turboxs.com/txs_tbe_sti.htm
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Old 08-18-2003, 03:02 PM   #43
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So are most exhaust mods screwing up the Check engine light? CEL is bad no matter what gains you get.
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Old 08-18-2003, 03:13 PM   #44
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most, yes. all, no. please research if you want to know which are which.
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Old 08-18-2003, 03:57 PM   #45
Janq
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Default Re: Re: Hard proof of performance?

Quote:
Originally posted by dsmperformance

Here is some info on the TXS system. Dyno charts also...
http://www.turboxs.com/txs_tbe_sti.htm
Thanks DSM - I saw those results but they aren't exactly impartial as TXS is posting their own findigs to sell me stuff. I'm not saying their results aren't factual, but I would like to see real 'end user' dyno numbers for comparison/review. Also, the dyno charts they provide aren't on paper.

Thanks happasaiyan - I'd been following that ClubWRX thread for a while but as of late its gone dead of any valuable information. Tonight I'll go back through the early posts to try to find dyno info as you suggested.

Sorry to be difficult & doubtful guys but I have a hard time taking at face value the performance gains suppliers say you'll get without real & hard evidence. By nature though I'm a 'Doubting Thomas'.
For the cost of these systems and the potential work/trouble involved (CEL's) I'd like to be sure & confident I'm actually going to get the real gains marketed and expected.

If I find hard evidence elsewher during my adventures I'll post it here for you guys to review.

Regards,

- Janq
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Old 08-18-2003, 04:06 PM   #46
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i understand your skepticism, but i actually have the same exact setup as dan who got the 300awhp out of his STi. mine actually doesnt even ping, but his did sometimes. its a totally different beast. the car pulls HARD all the way to top speed. its ridiculously fast, and this is still barely a "stage 1." in the first page of that thread (or maybe 2nd) is where the charts are. the reason its gone dead is because 1) dan has been really busy, and 2) his car is in pieces, as he has sent out the injectors, ecu, etc out to japan for reverse engineering. i cant wait to see whats in the wings.

btw in its current form, there are NO CEL's. the only CEL was from overboosting, and that has been cured with proper adjusting of the hpbc. happy motoring.
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Old 08-18-2003, 04:10 PM   #47
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I just put the WorxTuning turbo back on my car last week. I will be dynoing it in early September but I will be another to chime in with the Butt Dyno. It really woke the car up, especially in top end pull. Worx had some dyno charts showing about 25 hp increase but James told me he didn't want to release any untill it cooled off a bit and they reran the car. Something about the 120 degree ambient air temps in Phoenix. Quality is superb. Stainless with 1/2" flanges, Downpipe with a nice long dumptube, and a cool rebuildable muffler that weighs 3lbs. Plus no CEL after almost 1500 miles. They use a revised o2 location. Can't say enough about these guys, great customer service. The company is local so I have ridden in their STi and it totally made mine feel like a slug. I am running their BOV and Exhaust now. Top Mount soon.
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Old 08-18-2003, 04:16 PM   #48
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Quote:
Originally posted by neverfastenuff
I just put the WorxTuning turbo back on my car last week. I will be dynoing it in early September but I will be another to chime in with the Butt Dyno. It really woke the car up, especially in top end pull. Worx had some dyno charts showing about 25 hp increase but James told me he didn't want to release any untill it cooled off a bit and they reran the car. Something about the 120 degree ambient air temps in Phoenix. Quality is superb. Stainless with 1/2" flanges, Downpipe with a nice long dumptube, and a cool rebuildable muffler that weighs 3lbs. Plus no CEL after almost 1500 miles. They use a revised o2 location. Can't say enough about these guys, great customer service. The company is local so I have ridden in their STi and it totally made mine feel like a slug. I am running their BOV and Exhaust now. Top Mount soon.
hmm...hoping by "Top Mount" you really meant "Front Mount"

just curious, what else did your tuner haev on their STi?
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Old 08-18-2003, 04:30 PM   #49
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No, I meant top mount. I don't really want to cut the bumper and will never take it to the levels that necessitate a front mount. I am just fine tuning an already spectacular car. As far as their car goes, he told me it had Intake, exhaust, Samco intake peice, Intercooler, Blow off valve, different plugs, and I think a mildly reworked stock turbo. I dont know what else. Their site is worxtuning.com but I don't think the new one is up yet.
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Old 08-19-2003, 02:39 AM   #50
Janq
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Default Dyno Sheets Found...

Ok guys,

I'm re-reading through the ridiculously long god threat at ClubWRX.com and found several links to dyno sheets. I figured I'd cross post them here for all of you (and the lurkers) to review as I can't be the only person wondering/looking for "proof". I'm also going to bring over any comments I find that I feel are interesting or pertinent to this thread and our ultimate goal, more power.

The following comments were copied as posted by the member god;

* Okay dyno sheets. Here's the boost sheets too.
This one is stock v. Turbo XS HPBC and no intake resonator



* Okay here's the stock v. Godspeed downpipe and HPBC, no resonator. I was running a little more boost on this one.



* Hit 301.5 whp and 312 ft lbs of torque this morning. This was with just Godspeed downpipe and Blitz SUS filter with boost set to 16.8 PSI.

* AF ratio varies a bit. It drops to 10.7 at redline. We used 93 octane and used stock exhaust. We will try no muffler again with the downpipe and intake to see what changes will be made. We tinkered with boost to get the 301 whp. 16.8 PSI seems ideal. If you go higher the ECU will pull timing in the midrange anyway. We are using 93 octane fuel.

* Well it looks like the exhaust was pretty restrictive. We are going to run some more tests today but looks like we should be able to get even more power out of it.

* I don't PM because I'm on WAY too many boards. Please feel free to e-mail me anytime. I'm always happy to answer people's questions. Here's a shot of the Blitz SUS intake on the Sti and you can see the boost controller there.

After page 13 of this thread there pretty much only garbage & rants that have nothig to do with the topic at hand. So, thats it.

It seems the best pathway to power as per god's trials seems to be with a downpipe, MBC set to 16.8 max and the SUS filter/intake. Makes me wonder what might happen with the addition of the TXS 'stealthback' system ($730) and the stock STi muffler (to keep things quiet & street legal)...

I hope this helps out the thread overall.

- Janq

Last edited by Janq; 08-19-2003 at 12:34 PM.
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