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Discussion Starter · #1 ·
I remember a few of people insisting that improving the air intake on the R wouldn't lead to an increase in power because it is a turbo engine, and the turbo provides the same boost regardless intake of air flow. I made a CAI (and A LOT of people have some form of it now) and we all felt that the car was quicker with it installed. There was a great Audi turbo article that showed how decreasing negative pressure pre-turbo increased power. Finally, I posted g-Tech results that showed an increase of 10 hp in 3rd gear, but still there were non-believers who touted that CAIs won't add hp on turbo cars. <p>To quote Darryl Hammond imitating Sean Connery, "Suck it Trebec". <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"><p>From Car and Driver<p><A HREF="http://www.caranddriver.com/reviews/hot_lists/high_performance/gear_box/five_steps_to_making_more_power_in_your_subaru_wrx_gear_box" TARGET="_blank">http://www.caranddriver.com/re...r_box</A><p><I>More Mods For Our Project WRX <p>The Subaru Impreza WRX is a performance bargain: A quarter-mile time of 13.5 seconds at 101 mph is as quick as any WRX STI we’ve tested, and the standard WRX model is about 10 grand cheaper. Being power hungry, we have investigated a number of claims that even more output—over the stock 265 horsepower and 244 pound-feet of torque—is available with a few simple modifications. As we found, your results may vary. Here’s how we got that extra power: <p>STEP 1: The Intake Trick <p>Getting more air into the engine’s combustion chambers produces more power, right? Right. After a simple installation, the low-restriction conical air filter and straight intake tube of the K&N Typhoon kit (800-858-3333; <A HREF="http://www.knfilters.com" TARGET="_blank">http://www.knfilters.com</A>) <B>gave us a 17-hp increase at the wheels and a new jolt of torque worth 21 pound-feet</B>. The intake carries its own million-mile warranty and doesn’t void the factory warranty. The downside: It doesn’t meet California emissions regs, and the increased intake noise was hated by the old folks in our office. </I><br> <br>Some more great information about exhausts and combining mods:<p><I>STEP 2: The Exhaust Tactic <p>We were feeling pretty smart after installing a Magnaflow exhaust (800-824-8664; <A HREF="http://www.magnaflow.com" TARGET="_blank">http://www.magnaflow.com</A>). All it took was a few bolts and clamps, <B>and the WRX was putting out a pleasant burble at idle without being too loud. Power was unchanged, but torque increased by 10 pound-feet.</B> Like the intake, the stainless-steel exhaust is guaranteed for life and won’t void the Subaru warranty. <br> <br><B>STEP 3: But They Don’t Add Up </B><p>We put our project car on a dynamometer with the K&N Typhoon intake and the Magnaflow exhaust (the numbers mentioned earlier were achieved with each performance piece installed solo on the WRX). With both installed, <B>horsepower was up by 11 over stock and torque was up 20 pound-feet—increases that are less than those produced by the modified intake alone. The extra airflow on both ends was apparently too much for the factory ECU to cope with, and it compensated by cutting power right when the turbo reached maximum boost. Either the intake or exhaust works fine alone, but ECU modifications are required to get them to work in tandem. </B> <p>STEP 4: Let’s Get Serious <p>So, to get even more power, we had the engine reprogrammed. Remember, that voids your powertrain warranty. We called Cobb Tuning (801-713-0035; <A HREF="http://www.cobbtuning.com" TARGET="_blank">http://www.cobbtuning.com</A>) for its AccessPort, which can completely revise the engine software. And to further free up the exhaust, we threw in a Cobb downpipe with a high-flow catalytic converter. The AccessPort connects to the OBD II plug and automatically saves the factory engine programming. It also has preset engine maps for various states of tune, but none that accounts for an aftermarket intake. <B>Cobb says there are too many variables to have a single program, so we got a $460 custom engine tune. After that, wheel horsepower was up 57 to 266, torque increased a staggering 68 pound-feet to 293</B>, and now the engine sounds meaner than Sasquatch’s wife. <br> <br>The dyno tests, done at Speed Industry in Troy, Michigan (www.speedindustry.biz), report horsepower and torque measured at the wheels. Correcting for driveline losses, <B>a conservative estimate is that crank horsepower has been increased by 65, over the stock figure of 265, for a total of 330</B>. The power boost shows up most noticeably at higher speeds. Our souped-up WRX was 0.3 second quicker to 60, at <B>4.4 seconds</B>, and 0.4 second swifter through the quarter-mile, at 13.1. But the advantage at 100 mph is 1.3 seconds, and the gap gets wider all the way to the 142-mph top speed. So for less than $4000, high-speed acceleration has improved enough to shame any stock WRX STI.</I><p>Really interesting comments that we have been talking about for years here in the R Forum; e.g. <br>air intakes do/don't work on turbo engines<br>cumulative effect of combining mods<br>ECU intervention to cut effect of mods<br>if you can have a 1 size fits all ECU flash like somE companiEs insist<br>or whether you need an ECU flash to take advantage of multiple mods<br>the facts that exhausts don't really add power but make car sound great<p>and why is it a stock WRX (NOT an STi which is slower and costs $10k more) gets to 60 mph in 4.7 seconds? And how awesome is it that you can add 65 hp for $2850 and make a 4 door sedan that blows most everything off the road ([email protected], [email protected])? ($2850 = intake $325, exhaust $775, dp $600, softloader/tune $1150).<p><IMG SRC="http://www.caranddriver.com/var/ezwebin_site/storage/images/reviews/hot_lists/high_performance/gear_box/five_steps_to_making_more_power_in_your_subaru_wrx_gear_box/five_steps_to_making_more_power_in_your_subaru_wrx/2009_subaru_impreza_wrx_sedan_10/2181340-1-eng-US/2009_subaru_impreza_wrx_sedan_10_gallery_image_large.jpg" BORDER="0"> <p><IMG SRC="http://www.caranddriver.com/var/ezwebin_site/storage/images/reviews/hot_lists/high_performance/gear_box/five_steps_to_making_more_power_in_your_subaru_wrx_gear_box/five_steps_to_making_more_power_in_your_subaru_wrx/2009_subaru_impreza_wrx_sedan_11/2181354-1-eng-US/2009_subaru_impreza_wrx_sedan_11_gallery_image_large.jpg" BORDER="0">
 

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Re: Improved air intakes and other mods on turbo engines ("R" Kelly)

That's F'ing awesome!!! Now if Volvo could just make a C30 that can do that I'd be all over it!!!
 

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Re: Improved air intakes and other mods on turbo engines (chillidawg)

Sounds about right <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>WRX is too cheap feeling for me though. I worked at a Subaru dealer while in college and drove many WRXs daily, blah <IMG NAME="icon" SRC="http://********************/smile/emthdown.gif" BORDER="0">
 

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Discussion Starter · #4 ·
Re: Improved air intakes and other mods on turbo engines (GiRaff3)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>GiRaff3</b> »</i></TD></TR><TR><TD CLASS="quote">WRX is too cheap feeling for me though. I worked at a Subaru dealer while in college and drove many WRXs daily, blah <IMG NAME="icon" SRC="http://********************/smile/emthdown.gif" BORDER="0"> </TD></TR></TABLE><p>Thread really wasn't supposed to be about a WRX per se, mostly about the results of tuning the turbo in it, and what C&D learned from each of the different mods.<p>Although, if I was replacing my R, this is what I would buy.
 

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If an intake nets 17hp and 21ft-lb then the stock equipment must be using a cat as filter media. That is absurd.
 

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Re: Improved air intakes and other mods on turbo engines ("R" Kelly)

Cool article...if only we all had the time and dynos were available for free..
 

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Re: (kenhoeve)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>kenhoeve</b> »</i></TD></TR><TR><TD CLASS="quote">If an intake nets 17hp and 21ft-lb then the stock equipment must be using a cat as filter media. That is absurd.</TD></TR></TABLE><p> <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> LMAO! nice visual.
 

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Discussion Starter · #8 ·
Re: (kenhoeve)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>kenhoeve</b> »</i></TD></TR><TR><TD CLASS="quote">If an intake nets 17hp and 21ft-lb then the stock equipment must be using a cat as filter media. That is absurd.</TD></TR></TABLE><p>LOL, poor kitty. Although it seems like Suburu can easily make a filter/intake change for some easy horsepower next year. <p>The bit about the stock ECU not being able to handle both intake/exhaust mod together was really interesting. I remember when I had intake/filter/DP/exhaust going that over time car would slow back down to stock speed. This was pretty much confirmed by acceleration testing against other stock S60Rs on the autobahn, and when I would reset the ECU, it would feel VERY different. Johann said that without an ECU flash, the ECU would work to return the car to stock power, and I think this lends credence to that.
 

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thats pretty sweet and all, but i work with a guy that had one (he wrecked it) the intake manifold is made of plastic, yes the manifold i didn't believe him till i saw it. inside was kinda cheap too
 

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Hey....i believed ya!<p>I have a Kelly intake.<p>We should name names of the doubters.
 

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Re: (epicV70R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>epicV70R</b> »</i></TD></TR><TR><TD CLASS="quote">So what is the cheapest most affective way to have an R-Kelly CAI? IPD's version looks nice but for $90? Kinda steep!! </TD></TR></TABLE><p>It seems that way, however the aluminum peice, and the custom fog light inlet, aren't cheap. <p>The hose is very durable and won't crap out on you.<p>You could DIY it with some hose, glue, and cutting up a funnel. But that is completely up to you and your imagination.
 

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Re: (Rally_Junky)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Rally_Junky</b> »</i></TD></TR><TR><TD CLASS="quote">thats pretty sweet and all, but i work with a guy that had one (he wrecked it) the intake manifold is made of plastic, yes the manifold i didn't believe him till i saw it. inside was kinda cheap too</TD></TR></TABLE><p>That seems to be the way of the future. The intake manifolds on my last three company cars have been plastic (Chevy Malibu). I think most new Toyotas are using plastic manifolds. IIRC the intake manifold on the vette is plastic too.
 

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Re: (Garnetmica)

Thanks for that input! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"><p>Installed my ipd kelly cai few days ago <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

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Discussion Starter · #15 ·
Re: Improved air intakes and other mods on turbo engines ("R" Kelly)

Something else I just noticed is that the WRX has a 21% hp drivetrain loss (265->209). This seems right in line with the 23% we've seen when people take their stock R to the dyno. <p>So for the people that thought the R had excessive drivetrain losses, well, it appears that 23% is fairly normal for an AWD car (just like JimLill said).
 

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Re: Improved air intakes and other mods on turbo engines ("R" Kelly)

Riddle me this - for folks with a 'stock' tune and aforementioned mods, when the car returns to 'stock' power levels because of an ECU correction, are they at least seeing an increased efficiency WRT combustion and fuel consumption?
 

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Discussion Starter · #17 ·
Re: (epicV70R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>epicV70R</b> »</i></TD></TR><TR><TD CLASS="quote">So what is the cheapest most affective way to have an R-Kelly CAI? IPD's version looks nice but for $90? Kinda steep!! </TD></TR></TABLE><p>Steep? I was charging $110 and they've improved the kit and sell it for $89 (lower overhead). <br><IMG SRC="http://www.ipdusa.com/uploads/images_skus/13179.jpg" BORDER="0"><p>Other intake systems for the R for comparison (that are not stealthy):<p>Evolve AMS: $449<br><IMG SRC="http://www.evolvecars.com/site/pictures/productpages/ams/IMG_8232.jpg" BORDER="0"><p>EST Ultraflow system: $299<br><IMG SRC="http://i243.photobucket.com/albums/ff207/kkafeyan/VLE-160-202-T1.jpg" BORDER="0"><p>BSR Optiflow: $234<br><IMG SRC="http://en.bsr.se/bilder/_/art_x375y250_4900702_1.jpg" BORDER="0"><p>So $89 doesn't seem steep for proven results. Having said that, even if someone goes with a more expensive kit, the IPD will work with these and route high-speed cold air to the filters, which is always good since all these are open air systems.
 

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Re: ("R" Kelly)

Very cool thread, but the new style WRX is just not attractive IMO. You absolutely get more bang for your buck with that thing than you do with an R. Honestly who thinks that the WRX is more attractive than the R?? If I was getting a Subaru it'd be this one with whatever mods this thing has. KEN BLOCK FTW<p><A HREF="http://www.youtube.com/watch?v=HQ7R_buZPSo" TARGET="_blank">http://www.youtube.com/watch?v=HQ7R_buZPSo</A>
 

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Re: (b1gtime)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>b1gtime</b> »</i></TD></TR><TR><TD CLASS="quote"> If I was getting a Subaru it'd be this one with whatever mods this thing has. KEN BLOCK FTW<p>v=HQ7R_buZPSo[/url] </TD></TR></TABLE><p>Haha it has the best mod of all "Subaru /Rally America Free cars for life" mod.<p>Anyways i was thinking today about this whole thing. And i think why cold air gives more power is because you get more air in the turbo. I am commercial diver and when you fill a HP cylinder you get more pressure in it when its cold. Pretty common for Recreational scuba divers to fill there tanks in a cold environment and then when they are sitting out on the hot beach the pop-off blows due to over pressurization. So it might work the same the turbo can only hold so much air but you can cram more cold air in. Although i could be completely wrong just thought it might work the same, i am just a construction worker not a scientist haha. <p>Also how come it seems everyone here is concerned with sealing the filter off from the engine when Evo's and Sti's and plenty other cars run open filter "CIA's" just thought it was odd that i haven't seen any other cars with the same concerns as us.<p><br>
 

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Cold air is more dense...greater density means more oxygen and other goodies...as found in turbo and supercharging, the more oxygen and goodies you can ram into the cylinder the better. <p>Sealing the CAI underhood helps control the amount of warm air (less dense, less oxygen and goodies) from entering the system.
 
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