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10-31-2006, 10:06 AM | #1 |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
intake, downpipe, header and no tune... what is the stock ecu going to do?
ok, ive got a header and a downpipe about to go on the sti. Im wondering how safe its gonna be on stock ecu with no tune since i woulnt be able to get a utec for a month or so.
should i get a CEL fix for the downpipe?
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10-31-2006, 06:21 PM | #2 |
Scooby Specialist
Member#: 17256
Join Date: Apr 2002
Chapter/Region:
South East
Location: America's Outback
Vehicle:18 Outback on the road.... |
It will adjust. You will leave a lot on the table without a tune, though. CEL fix if you need it. I am running the defoulers and they seem to work fine.
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11-01-2006, 03:57 AM | #3 |
Sammo Hung
Moderator Member#: 10613
Join Date: Sep 2001
Chapter/Region:
South East
Location: N Fla / S Ga
Vehicle:2002 USDM WRX WRB |
it will run rich, just like factory afr.
i did the same thing..black tail pipe will be evident. |
11-01-2006, 10:16 AM | #4 |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
update: i put the downpipe on yesterday with no CEL fix. The car hasnt thrown a check engine light yet so i guess thats good. however, it does feel like its getting a very slight stumble taking off in first gear. I wonder what its doing??? Searching to correct afr?
also, what does the ecu do when you mess around with these cars? ive been reading into the subaru ecu stuff and from what i understand the ecu has a low detonation and a high detonation map as well as two timing maps. so does it switch over to high det whenever u put on a downpipe? |
11-01-2006, 12:32 PM | #5 |
Scooby Guru
Member#: 60324
Join Date: Apr 2004
Location: soon to be somewhere else
Vehicle:1998 RS |
putting on a DP wouldn't by itself cause the ecu to switch to high det. high det will cause it to switch to the high det map though
and you will throw a CEL eventually... and the stumble is probably from the intake, i would suggest a tune for that. |
11-01-2006, 01:05 PM | #6 |
Scooby Specialist
Member#: 44771
Join Date: Oct 2003
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Why don't you play it safe and flash your ECU ala:
www.openecu.org www.tactrix.com and if you want to tweak your map some, lower boost etc. www.enginuity.org Cheap egt http://www.jegs.com/webapp/wcs/store...chItemId=79699 Guage bezel, insert EGT and you can move your stock boost guage into the other side, I did it, doesn't look too hokey. http://www.fastwrx.com/dugadabe.html Wide band http://www.zeitronix.com/Products/zt2/zt2.htm $80 for cable, free tunes $125 for cheap egt $79 guage bezel $279 wideband total: $563 Utec what? PS I own a Utec. |
11-02-2006, 03:21 AM | #7 | |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
Quote:
also, the downpipe did throw a code earlier today so i picked up a fix. problem solved. |
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11-02-2006, 03:46 AM | #8 |
Scooby Newbie
Member#: 57387
Join Date: Mar 2004
Chapter/Region:
SCIC
Location: Orange county
Vehicle:02 wrxwagon PSM |
Umm, you purchased a $34000.00 car...You decided to dump a couple of hundred dollars in parts on it, I am assuming that you researched things on nasioc a little bit...I am wondering why you are stalling on some kind of engine managment? Everywhere I have researched about our cars, the first thing anyone mentions is EM. Not that I am a Cobb guy, but 600 bucks and you have a device that will flash stage0 - stage 2 maps, this may be the 600 dollars that saves you a $7000.00 rebuild. I think you should do your mods correctly...There are alot of incredibly smart people on here who have modded many a subaru, and have mucho info on what works and what does not...
I am not one of those incredibly smart ones, and I may sound like a Richard Nixion...Sorry...You have a great car, and it looks like your gonna go the half ass route, and I would hate to see you make a sheet sandwich and half to eat it. I think you would be incredibly surprise at the performce of your car stock, to this downpipe, to downpipe with a tune...In the end I bet you would find the best performs would be...In numerical order....1. Downpipe with a tune 2. Stock 3. ( and very last ) downpipe |
11-02-2006, 10:19 AM | #9 | |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
Quote:
i think the only thing im doing that could be considered "half assed" would be looking into tuning this car with an aftermarket device that is not well known. however it is doing the same thing as ecutek without a couple small features. personally i dont see why anyone would wanna pay 900$ to get a 2 hr ecutek tune...get real! imho thats highway robbery, and these people continue to pay for this stuff so prices go up. a suby tune should cost just labor, but shops are charging a flat fee on top of labor! its b/s. this leads me to another point, just because i spent 32k on my sti doesnt mean that i have to spend tons of money getting name brand parts and payin assloads of money for 40 more hp. i started out with a wrx that had a vf30, pinks, sti tmic, utec, up, dp hks hi power, and gt spec header. send a pm to blueandgold and ask him if i took any shortcuts on that car. ive been driving subarus for over a year, ive done everything from port work to transmission swaps and repairs. i know the cars i know how they make their power (tune). god knows i spend tons of time surfing these forums! my whole thing is that i hate goin slow and i dont have gobs of money to throw into the car so i do small mods at a time, this time it was the dp, next is catback then tune. im going to go stage 2 for 600$ ARE YOU???? i'll put the rest of the money into a fp green, injectors, etc trust me, the sti will be just as fast and as nice as any other stage 2 car out there, with no shortcuts. |
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11-02-2006, 10:55 AM | #10 |
Scooby Specialist
Member#: 44771
Join Date: Oct 2003
|
Be sure to post pics/timeslips/dyno charts when you get things going.
BTW, if you need help with some of that open source tuning stuff, I contribute to enginuity and know there are some really knowledgeable people that can help. (I can tune, but I just know the basics). |
11-02-2006, 11:32 AM | #11 |
Scooby Newbie
Member#: 57387
Join Date: Mar 2004
Chapter/Region:
SCIC
Location: Orange county
Vehicle:02 wrxwagon PSM |
Ummm, sorry if I hurt your ego. With all of this modifaction expertise you seem to have, you OG post seems odd. I could care less what parts you have, and what major label tune you get...
Just becasue you spend 32000 for your STi, or 24000 for a WRX does mean you plan out your mods so you do not firetruck up your car...you do this becasue you do not have "gobs" of money. you do not need to reply to this, my ego is not on the line, I will quietly walk away now. Good luck. Cool car you bought. |
11-02-2006, 06:23 PM | #12 | |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
Quote:
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11-02-2006, 06:28 PM | #13 | |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
Quote:
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11-02-2006, 07:13 PM | #14 | |
Scooby Specialist
Member#: 107092
Join Date: Feb 2006
Chapter/Region:
Tri-State
Location: Ossining, NY
Vehicle:2005 WRX Evo3 16g Platinum Silver Metallic |
I was worried when I had aftermarket intake and downpipe to run the car hard on my 05 wrx without a tune. Headers!! on an 06! id get that tune asap. At least dont put them on until like the day b4 the tune. the downpipe will make ur engine run hotter and without the O2 sensor youll run rich and hit limp mode eventually. The DAY of my tune (id put the downpipe on the day b4) (downpipe had a bung for the O2 sensor and a cat in it) i let my friend drive without me and when he backed out of my parking spot bottomed out on a storm drain. The O2 sensor bent in half and stoped working. So i limped to my tuner and he fixed it all. Im just a big worrier but u know whatever u do is not terrible just watch out on those headers.
Quote:
P.P.S it really is highway robbery.. life just sucks like that. |
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11-02-2006, 09:54 PM | #15 | |
Scooby Guru
Member#: 99102
Join Date: Oct 2005
Chapter/Region:
South East
Location: Jax, FL
Vehicle:17 BMW M2 Long Beach Blue 6MT |
Quote:
why all the caution when it comes to the header? i figured the biggest issue would be with the dp and the 02 sensor gettin funny readings and goin to limp mode. so what does the header do that i need to be careful about? im glad someone finally agrees with me on the outrageous price of an ecutek reflash... and i put a cel fix n my downpipe and it fixed the check engine until i can get a tune |
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