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Old 03-16-2012, 04:24 AM   #1
Rymaster
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Member#: 296277
Join Date: Sep 2011
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2002 Impreza WRX
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Question 02 WRX Auto - Really worth a tune?

Basically bought this car and have had it a good 5 months now. The previous owner is actually on this forum and it has a cobb stage 2 tune on it. But we all know they run safely so MPG sucks hardcore. A full tank all highway I'll get like 27mpg but if I'm just local cruising for half the tank or so I'll be lucky to even hit 15mpg, its more like 13mpg. Idle is so rich

I'm just deciding if I should go to a local reputable shop (agile) and spend the $500 to get it properly tuned or just take the cobb tune off of it. I'm not looking to have them do an aggressive tune just something more on the conservative side. I know I read somewhere on here though that even a conservative protune can make a decent difference.

Mod wise besides the cobb accessport, it has a turbo XS catted turbo back exhaust and a Catless TXS uppipe. Not really planning on ever doing anything else performance wise to the car, as it's an auto.

Thanks for the input!
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Old 03-16-2012, 10:34 AM   #2
jershelb
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Odd, my wife's auto cobb 2 car idles and cruises at a very acceptable a:f according to my NGK wideband, it only richens under load... Not sure that a pro tune would benefit you on the cruising / mpg side of things.

ps. We had considered leaving her car stock, now that it is on 17-18 psi neither of us can imagine driving it on stock boost, very fun car.
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Old 03-16-2012, 10:41 AM   #3
ppayer38
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Pro Tune will help mpg a little but more smooth everything out for you.

The car shouldn't idle any different then it did from stock even with a OTS map so you need to check for vaccum/boost leaks

If you have the money to spare go for a Pro Tune and you'll enjoy it along with the car feeling smoother
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Old 03-16-2012, 10:58 PM   #4
Phatron
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CEO PhatBottiTuning
2006 STi GTX3582 + Meth

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There is no leak that the car can have to make it run rich under vacuum.

Every leak makes the car lean out under vacuum.

If you've never replaced the front 02 sensor then do that. Check your spark plug gaps. The last 4-5 sets of "pre gapped" plugs I've gotten we're all 0.045-0.055 and supposed to be 0.028-0.030
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Old 03-17-2012, 12:37 AM   #5
Rymaster
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Will do, thanks guys! Boost has always seemed good and constant under WOT or anything between.
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Old 04-19-2012, 07:20 AM   #6
MDRex
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Dude, that's strange. I never had it run like that. I averaged 21 mpg for the entire time I owned it. My normal driving was half city (literally, commuted through downtown Baltimore everyday) and half highway (the other half of my daily commute).

Did this problem start recently? What did the dealer do before you picked it up?
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Old 11-12-2012, 12:07 AM   #7
Rymaster
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No it wasn't recent, the dealer did nothing major besides just the timing. Car has been running strong though! Mileage got better with a tune, usually right around 20 now while driving around locally. Even with boost being increased/ebcs installed.
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Old 11-13-2012, 10:59 AM   #8
Ernest
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My mileage with 75% city 25% highway was always 18-19 mpg. Now that my commute is really short all city, I am seeing 16-17 mpg. I was thinking something might be wrong, but I think its just my heavy right foot. Since I did the PNP headers and X-pipe the car pulls nicely and I am in boost all the time with my Stage 2 E-tune.

I say a tune is always worth it if you are keeping the car for a long time. Think about it $500 bucks over 5 years is nothing for the improvement. At least an e-tune, never OTS.
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