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Old 01-29-2011, 07:12 PM   #1
AznDisaster
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Default Tune after bolt-on parts.

So I was wondering if its worth it to put on an intake and getting it tuned if i have 2007 impreza 2.5i and its a/t...

I'm getting the intake for free anyways... do i really need a tune/or can i get a tune for it?
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Old 01-29-2011, 07:17 PM   #2
Jessekrs123
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There is a big ol' sticky right at the top of this forum regarding CAIs, and N/A Subarus.

Here is the link:
http://forums.nasioc.com/forums/show....php?t=1471819

An A/T is not helping either... Unless you are flooring it and hitting the high rpms all the time, it will be virtually pointless.
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Old 01-29-2011, 07:18 PM   #3
AznDisaster
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Quote:
Originally Posted by Jessekrs123 View Post
There is a big ol' sticky right at the top of this forum regarding CAIs, and N/A Subarus.

Here is the link:
http://forums.nasioc.com/forums/show....php?t=1471819

An A/T is not helping either... Unless your flooring it and hitting the high rpms all the time, it will be virtually pointless.
thank you.
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Old 01-29-2011, 08:32 PM   #4
kero
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Yep, with 4eat and drive by wire, they are pretty sluggish sometimes. I have auto and it's just not worth doing much.
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Old 01-29-2011, 09:06 PM   #5
cmiovino
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I have an auto and opted for the low end power of the stock intake for my daily driving fun.
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Old 01-29-2011, 10:48 PM   #6
renyo
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I thought when williaty tested the CAI vs. the stock intake there were gains around 4000, which (at least with my old engine) is hit at least a couple times a day.

As for the CAI/MAF problem, as far as I can tell, the auto never lets the engine drop down low enough to get into the trouble area...

Or there's something wrong with my intake. :shrug:
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Old 01-30-2011, 11:22 PM   #7
Algreen
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In the cosmo SRI thread, it was said that the hybrid intake seems the best all around compromise on reliability and improved breathing. Other than unplugging the battery to reset the ECU, I don't think a retune is necessary.
I too have an a/t and am doing this too.
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Old 01-30-2011, 11:33 PM   #8
STi Mikey
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Yes, but the hybrid intake does require a tune for sure, then entire maf has to be rescaled from bottom to top. Ive done about 5 2.5i's with the 3" hybrid intakes. the kids were beating on their cars, and had no clue how lean they were / how much the car was knocking in the higher rpm range.

The most cost effective way to add a chit ton of throttle response and a few ponies is to drop in a filter and get a tune. It gets expensive after that.

Look for a guy named Jubert. He is from Hartford CT and I met with him personally in August for his tune on an auto 4 eat 2.5i. Maybe you can take a ride and compare cars.

-Mikey
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Old 01-30-2011, 11:35 PM   #9
PhatBotti Tuning TKR
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Sorry mods^^^ should have posted under vendor name.

-Mikey
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Old 01-30-2011, 11:52 PM   #10
Wrencher86
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Since there's an expert in the room, I've got a question, if you don't mind.

My last vehicle was a 2004 Honda Civic EX coupe. Based on my very rough calculations from on specs I could find online, it had a HP to weight ratio of around 20.3lbs:1HP. My current 2010 2.5i hatch has a HP to weight ratio of about 18.4lbs:1HP.

So why the hell does the Subie feel so much slower? Is it all in the tune? Do the custom maps make that huge a difference?

Sorry if this has been asked a bajillion times before. I seem to suck at searching.
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Old 01-31-2011, 12:07 AM   #11
PhatBotti Tuning TKR
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Quote:
Originally Posted by Wrencher86 View Post
Since there's an expert in the room, I've got a question, if you don't mind.

My last vehicle was a 2004 Honda Civic EX coupe. Based on my very rough calculations from on specs I could find online, it had a HP to weight ratio of around 20.3lbs:1HP. My current 2010 2.5i hatch has a HP to weight ratio of about 18.4lbs:1HP.

So why the hell does the Subie feel so much slower? Is it all in the tune? Do the custom maps make that huge a difference?

Sorry if this has been asked a bajillion times before. I seem to suck at searching.

Its not so much the power in this case as it is the "dumbed down" throttle mapping.

But in terms of power, the honda had 127hp and your 2.5i has 170 (both rough numbers) Power loss through friction in the AWD drivetrain along with the throttle mapping does not help what-so-ever.

Another thing that is probably most important:

The Stock ROM in these ECU's is geared toward a good 94 octane for optimal performance. When you drive spiritedly for the first time on whatever octane you may choose, the ecu picks up knock voltage and decides how much timing the car will run through an ignition multiplier.

So even if you run 93, you dont have 170hp, you probably have 155hp (though the car is CAPABLE of that 170).

Hence why your civic may seem faster.

Now here is how you use a lower octane, get tuned, and make more power:

An N/A car makes power by way of valve timing / cam advance, AFR, and timing. While we cannot touch upon the heads via what we have offered to use in various softwares, timing is what will make power. There are base timing tables, and additives. In some spots of the ROM, the additives are much higher than other spots. I find those spots, adjust the timing up or down accordingly, and now your 155 is 165 (in complete theory, much more complicated).


-Mikey
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Old 01-31-2011, 04:01 PM   #12
Wrencher86
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So 10hp out of just a tune? That's pretty good. Is that on premium or can that be accomplished on mid-grade 89-91 octane (which I currently run)?
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Old 01-31-2011, 08:22 PM   #13
jeonster
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Quote:
Originally Posted by STi Mikey View Post
Yes, but the hybrid intake does require a tune for sure, then entire maf has to be rescaled from bottom to top. Ive done about 5 2.5i's with the 3" hybrid intakes. the kids were beating on their cars, and had no clue how lean they were / how much the car was knocking in the higher rpm range.

The most cost effective way to add a chit ton of throttle response and a few ponies is to drop in a filter and get a tune. It gets expensive after that.

Look for a guy named Jubert. He is from Hartford CT and I met with him personally in August for his tune on an auto 4 eat 2.5i. Maybe you can take a ride and compare cars.

-Mikey
HAHAHA "jubert"
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Old 01-31-2011, 10:32 PM   #14
PhatBotti Tuning TKR
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Quote:
Originally Posted by jeonster View Post
HAHAHA "jubert"
LOL, holy chit. I meant Jeonster, I tuned Jubert who has a WRX not too long ago, lol.
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Old 02-02-2011, 05:25 PM   #15
Rudgers73
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HAHAHA "Jeonster"
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Old 02-03-2011, 10:42 AM   #16
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Quote:
Originally Posted by Rudgers73 View Post
HAHAHA "Jeonster"
yes???
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Old 02-03-2011, 12:14 PM   #17
SPACEMAN5000
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Hahahahaha!
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