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      05-24-2010, 10:15 AM   #1
Panchio
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RPI scoop + AFE Air intake = Less HP???

Hello Guys,

Quick question I have been reading about the AFE Air Intake + the RPI Scoop does not give you more HP. The car sounds nice with the AFE but I'm actually after more HP then Sound.

I have had the AFE intake since October 2009 (no RPI scoop) and the car did sound awesome but no difference in performance. Now I just added the RPI Scoop and somehow when I press the Sports button, the car does not feel eager to go as before. I almost feel like putting back the original Air box and leave the RPI Scoop.

Any comments? anybody with similar experience?

Thanks a lot,

P
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      06-15-2010, 11:09 AM   #2
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Well I don't know the answer to your question but if you are looking to sell your AFe intake then let me know and I will buy it from you.
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      06-15-2010, 11:22 AM   #3
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Quote:
Originally Posted by Panchio View Post
Hello Guys,

Quick question I have been reading about the AFE Air Intake + the RPI Scoop does not give you more HP. The car sounds nice with the AFE but I'm actually after more HP then Sound.

I have had the AFE intake since October 2009 (no RPI scoop) and the car did sound awesome but no difference in performance. Now I just added the RPI Scoop and somehow when I press the Sports button, the car does not feel eager to go as before. I almost feel like putting back the original Air box and leave the RPI Scoop.

Any comments? anybody with similar experience?

Thanks a lot,

P
Software may help your issue a little. Have heard it can cause 1-2 hp loss with scoop. Give Elroy a call at Race Precision. He can help.
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      06-16-2010, 09:54 AM   #4
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would you mind posting what you find out? i am also curious about this combo, but want to know before i buy and install.
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      06-29-2010, 03:50 PM   #5
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Any updates on this? Kinda looking at an intake as next mod and would like to know!
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      06-29-2010, 03:57 PM   #6
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yeah i've been checking to see if this thread has been updated...

i went ahead and bought just the RPI scoop will post when I install. I'm still doing some research on an intake.
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      06-29-2010, 11:40 PM   #7
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Even seen no dynos for any of the "CAIs" on the M Coupe, and mixed results on the M3 ones.

It seems the consensus among M3 community is that the upgraded elbow+drop in filter is the best option when combined with software. That seems to show ~10-15 HP gains up top, with no real change in the midrange.

For the various CAIs I've seen dynos ranging between -5hp and +10hp, so tough call.
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      06-30-2010, 06:59 AM   #8
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Here is my dyno with an AFE intake, rpi scoop, ESS software, JVT headers, and SS race cans. Run number 3 is the first run and contrary to what RPI said I didn't lose HP after each run but instead made more HP. It was only a 2whp gain but still a gain.

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      07-16-2010, 01:00 AM   #9
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Sorry guys for taking forever to reply... so I think I lost a bit of power but not extremely crazy (that is just my feeling). That being said, I want to make you aware that I replaced my OEM 18" wheels with a 19" Forgestar. So I can't really blame the issue to the AFE + RPI Scoop combination, maybe the weight of the 19" wheels makes me believe that I have lost power.

Bottom line, the AFE intake sounds awesome but no power gains. The AFE makes the engine sound more aggressive. The RPI Scoop, apparently you get more HP when you are driving at 100Kph or 60Mph but I think that "YES" I need software to actually get the full benefit of this combination.
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      07-16-2010, 01:09 AM   #10
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Also, another recent modification to the car is:

4.10 Limited Slip Differential by DINAN.

I love this upgrade... To be honest with you, Now I really don't care about the AFE+RPI Scoop concern that I initially had. The cars runs awesome now.
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      07-16-2010, 02:50 AM   #11
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It is an interesting thread because i'm thinking about doing it to. but now with all this thread i doubt i will because all that money doesnt seem to really bring u some have the RPI scoops and bmc air filter with the RPI exhaust now i'm thinking about the ECU once again al lot of brands and dont know wich to choose then i was thinking about an air intake maybe gruppe M.
My question is how many hp can i expect witgh exhaust, rpi sccops, software and gruppe M or aFE intake??? HOW MANY HP??? keep on rocking the free streets
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      07-16-2010, 03:15 AM   #12
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I'd be surprised if you would get more than 20-25hp with all that. The difference in driving characteristics would be great i'm sure, more growl and smoother delivery with the software, but actual power gains wont be earth shattering.
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      07-16-2010, 07:04 AM   #13
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AAAAAAAAAAAHHHHHHHHHHHHHHHH ok well have no choice then to buy a supercharger
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      07-16-2010, 12:01 PM   #14
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Does anybody know if its just the AFE intake that could possibly make you lose HP? I'm looking into the GruppeM and would like to know from people who have one if they ever DYNO'd their car with it or feel any difference?
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      07-17-2010, 02:03 AM   #15
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I put the RPI scoop in my car about a month after the GruppeM and I can say that the RPI scoop adds a small but noticable gain in power and response at highway speeds. The GruppeM has more of a Ram Air design so that's likely why they work well together.

Bottom line; if you have a GruppeM, the RPI scoop will add a little more umph at high speeds. If you have an AFe, it may not do anything. If you have the stock box, get a CAI.
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      07-18-2010, 02:08 PM   #16
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Exactly, I heard that the Gruppe M and the RPI scoop is a better combination then AFE+RPI scoop. I read on a different forum (but I can't remember the link) that the stock air box on the Z4M is nicely engineered and that provided good air flow to the engine and blah blah blah. So My advice to you would be to get the RPI Scoop first and leave your OEM Air box... See how you like it.

I honestly didn't know about the Gruppe M option before I bought the AFE air intake. If I would have known, then for sure Gruppe M would have been my choice.
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      07-18-2010, 07:26 PM   #17
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Thanks for that Darkstar, I'll have to order the scoop while I wait for my GruppeM to arrive
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      07-19-2010, 01:11 AM   #18
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I got the scoops allready and u feel a little umph thats it. but not until 6000rpm maybe with the gruppe M a little more but my goal is next year a supercharger so the money i would spend on gruppe m i rather put it on the side for the supercharger
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      08-05-2010, 02:47 PM   #19
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Ill be quick and simple.

Stock intake + RPi scoop will out perform AFE intake alone or with scoops ANYDAY.

AFE = loss in power.

All the fastest bolt on Z4s have the STOck air box.
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      08-05-2010, 03:34 PM   #20
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Guys if you want the sound do it. If you want that lil red lip poking out behind you grille do it. You are talking about a best and worst case scenerio of +/- 5 hp. So 10hp swing total.

On a 330 hp car you are discussing a 3% change. Outside of perhaps an engine running smoother... only someone on a dyno will be able to tell less then 10% change.

For that differece, do what you want to your car, keep it quiet or make it growl!
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      08-06-2010, 04:50 AM   #21
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RPI exhaust es way enough if u want growl
IMO the money u spent on the intake rather put it on the side and keep it for a nice software OR the supercharger
wwwwwwwwwoooooooooooooosssssssssssssshhhhhhhhhhhh

I have to say that i met a guy with a AFE intake and was suprised about the sound maybe a Gruppe M is even better dont know
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      08-08-2010, 08:08 AM   #22
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I wanted the sound with no compromises (ie no drone) so I went GruppeM. Have the scoop sitting in a box so haven't put it on yet, but yeah I don't forsee it changing things much. Car sounds faster, that's about it
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