Newbie Here Needs Major Help!!!!! - Subaru WRX Forum
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post #1 of 23 Old 09-08-2006, 03:01 PM Thread Starter
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Newbie Here Needs Major Help!!!!!

Hello everyone, Im new here and Im just havin sum slight problems.... first off I have an 02 Wrx with a stock 2.0 my mods include; IHI VF34, Injen FMICand BOV, Manual Boost controller, Utec, AEM CAI, 3in Turbo back exhaust ( no cats), DC Sports Up, DC Sports Header, NGK plugs( one colder), STi pinks, and Walbro 255lph

My problem is recently when my car is under full load my car starts to backfire greatly at 4-5000rpms, thus I must shift really early. I have not thrown any CELs, I changed my plugs, checked my coil packs and wires, to no avail..... Does anyone have an idea as to what my problem may be??? If you need any more information just ask....Thanks alot guys.. and Im glad to be a member!!!
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post #2 of 23 Old 09-08-2006, 04:03 PM
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did you just install the UTEC?

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post #3 of 23 Old 09-08-2006, 04:05 PM
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sounds like too much fuel

"Life's a bowl of punch so go ahead and Spike it!" -311
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post #4 of 23 Old 09-08-2006, 04:09 PM Thread Starter
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I had the Utec installed and tuned by a shop, if there is to much fuel should i just turn my boost up, its set at 15 psi?
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post #5 of 23 Old 09-08-2006, 04:13 PM
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15 sounds low for a vf34, I run 20...
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post #6 of 23 Old 09-08-2006, 04:18 PM Thread Starter
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ok say i turn it up to 20psi.. would that fix my problem with backfiring???
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post #7 of 23 Old 09-08-2006, 04:21 PM
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don't just go cranking up your boost to "see what happens".

I suggest you take it to the shop, have them hook a laptop up to it and check it out. Don't let them con you into paying for dyno time. They can look at the problem on a road tune.

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post #8 of 23 Old 09-08-2006, 04:26 PM Thread Starter
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Ok yea thanks alot rexya ill do that monday, the shop is closed on weekends, but cani just undo the utec from the car and plug it into my cpu at home???
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post #9 of 23 Old 09-08-2006, 04:33 PM
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You can log your car yourself. Give that a shot. But yes, your car needs to be professionally tuned to run high boost.
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post #10 of 23 Old 09-08-2006, 04:36 PM Thread Starter
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ok so it wont erase my maps or hurt my car to unplug the utec from the car and brong it in my house and mess wit it on my desktop computer?
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post #11 of 23 Old 09-08-2006, 04:43 PM
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no, it needs to be installed. if you have a really long serial cable. you could look at it. But if you don't have experience with it, you won't know what you are looking at.
The MBC should only be used to bleed wastegate vacuum to get the target boost. All other boost controlling should be done with the UTEC. The shop should be using a modified stage 4 map.

If you're good at following directions, you could switch to another map, and load the TurboXS Stage 4 map. That may fix your prob until you can get it to the shop and get them to protune it again. If you decide to do this read up on turboxs' website or better yet, call them and have them walk you through it. you'll need to go to radio shack and get a serial cable that will reach from your computer to your car.

Above all, be carefull and know what you are doing before you do it. It's better to sideline your car for the weekend if your not sure.

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post #12 of 23 Old 09-08-2006, 07:12 PM Thread Starter
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thanks alot rexya.. your a great help...
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post #13 of 23 Old 09-08-2006, 07:31 PM
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No prob. The stage 4 map will do ok. A protune will be a lot better.

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post #14 of 23 Old 09-08-2006, 08:48 PM
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Hey man I have a similar setup to yours and when I first put all my parts in the shop that did it did a shitty job and I had some loose fuel injectors(long story). that along with to much back flow caused my car to detonate all the time. Look into getting some fuel rails and definitely get it protuned
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post #15 of 23 Old 09-08-2006, 08:51 PM
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What do you mean, back flow?

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