Just a question for people using them- Are they solely designed to go with a conefilter kit or are they also compatible with standard airbox. Are they used instead of the black plastic u-bend,because I just removed mine, it was looking like a huge restriction in the air intake flow (though probably there to stop water ingress).
RPI airscoop
- Thread starter goon
- Start date
Waste of money imo.
They're very crudely designed and don't channel air so much as deflect it so the flow won't be clean. A smaller nozzle isn't necessarily a restriction, if you go from large air space to another large air space (outside air to inlet airbox) then the smaller diameter accelerates the air as it travels from high to low pressure. I'd be willing to bet you get more of a 'ram air' effect with the standard setup.
They are used by people with normal air filters if you want to buy one and yes it's instead of that pipe.
They're very crudely designed and don't channel air so much as deflect it so the flow won't be clean. A smaller nozzle isn't necessarily a restriction, if you go from large air space to another large air space (outside air to inlet airbox) then the smaller diameter accelerates the air as it travels from high to low pressure. I'd be willing to bet you get more of a 'ram air' effect with the standard setup.
They are used by people with normal air filters if you want to buy one and yes it's instead of that pipe.
I've got one on mine that PVR put on, along with a BMC race filter, normal airbox. The only thing it does is add to the noise as far as I can tell. I like it though, looks the part.
Interesting comment about disrupting the air flow, as the Eventuri intake comes with a scoop that is essentailly the same as the RPI one.
Interesting comment about disrupting the air flow, as the Eventuri intake comes with a scoop that is essentailly the same as the RPI one.
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Anonymous
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Different folks different strokes
I bought rpi scoop and BMC filter
Once hit 4k revs I could feel the difference and at high speed when putting foot down
But then I sold scoop when I bought eventuri carbon intake and it's scoop
So I simply removed aibox and filter
The new filter has larger opening than standard box
So giving an increased area to allow more air in plus they suck in air as well as air being forced at speed
As I feel the oem scoop is both facing backward and not in direct line of any direct airflow I can't see how it would be better?
I bought rpi scoop and BMC filter
Once hit 4k revs I could feel the difference and at high speed when putting foot down
But then I sold scoop when I bought eventuri carbon intake and it's scoop
So I simply removed aibox and filter
The new filter has larger opening than standard box
So giving an increased area to allow more air in plus they suck in air as well as air being forced at speed
As I feel the oem scoop is both facing backward and not in direct line of any direct airflow I can't see how it would be better?
Here's an interesting article: https://www.google.co.uk/url?sa=t&s...teHNB6GmtwCTgLc6g&sig2=woDfSPIYZvJocRDFZVaG0w
It all depends on whether mass flow choking occurs with the standard intake size and I seriously doubt BMW would have allowed a loss in power for something so simple to solve. The air restrictors in GT3 racing cars are typically around 45mm yet they can still produce over 500bhp, what's the diameter of the standard pipe that people remove?
It all depends on whether mass flow choking occurs with the standard intake size and I seriously doubt BMW would have allowed a loss in power for something so simple to solve. The air restrictors in GT3 racing cars are typically around 45mm yet they can still produce over 500bhp, what's the diameter of the standard pipe that people remove?
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Anonymous
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Not so much a pipe as an angle backward facing shell
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Anonymous
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Tey telling that to a girlSteve84N said:
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Anonymous
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My badSteve84N said:
:titshake: :titshake:
Bing said:
Surely without re-mapping any theoretical gains can't be exploited? I dont't recall seeing any independent tests verifying power gains for intake mods (RPI K&N etc) but several with actual reductions or fault code issues. There maybe a very small amount of latitude within stock mapping which could theoretically be exploited with max octane fuel, dramatically reduced inlet temps, getting down to sea level and hoping for favourable high pressure weather, but it won't be much. I think the s54 in the M3 uses a different plenum/box to the e85/6 but don't know if that is due to bonnet shape or for performance so may be worth investigating?
This guy seems quite genuine and managed to get just a 2 bhp (1/2 %) gain from an RPI on an M3 at a fan simulated 90 mph but that's well within normal dyno accuracy tolerances and ignores real world air flows that probably differ from a fan in front of the inlet as he acknowledges, so who knows if there is any real gain at all? http://www.m3post.com/forums/showthread.php?t=229349
Sound good though 8)
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Anonymous
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Franzino said:100% waste of money...fitment is crap! Me and a friend tried to instal them on our Z4M's but both did not fit 100% and our feeling was that we got screwedSteve84N said:The RPI skid plates work well
You can't really go wrong fitting them?
Two screws out from oem 2 screws in to rpi people eventuri one
2 min job took longer to put kidneys back on mine
D4dawg said:Franzino said:100% waste of money...fitment is crap! Me and a friend tried to instal them on our Z4M's but both did not fit 100% and our feeling was that we got screwedSteve84N said:
You can't really go wrong fitting them?
Two screws out from oem 2 screws in to rpi people eventuri one
2 min job took longer to put kidneys back on mine
That was my thought also! The fitment was crap and there was a big gap between the scoop and the air channel... We ordered two sets for two Z4M and they did not fit 100%. When we checked the pictures on their website...our scoops looked a little different. We tried 3 times to fit them, send emails to RPI, etc....in the end we called it a day and made the conclusion that the product was crap or RPI delivered the wrong scoops to us and where not able to help us. Sorry I have zero good things to say about the scoop... 100% waste of money and in my opinion the worst thing I have ever bought for my Z4M. The skid plates did fit perfect and are a good product!
I had no issues fitting mine either, as long as I used the correct (long) and very short screw drivers. No gaps or anything either.
As it was a combo with the filter, it is very difficult to verify any gains or not. But like the GruppeM, it is more about the "noise" effect.
For the £150, it was worth it for me.
As it was a combo with the filter, it is very difficult to verify any gains or not. But like the GruppeM, it is more about the "noise" effect.
For the £150, it was worth it for me.
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Anonymous
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Glad wasn't just me then as was a doddlepvr said:
