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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Inner Diameter of Pure Inlet

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      02-11-2020, 10:19 AM   #1
AmuroRay
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Inner Diameter of Pure Inlet

FTP came out with a newer version of their turbo inlet that is larger diameter - But I have no idea how it compares to the PURE inlet. Does anyone have a measurement?

Edit: MST has one listed as well.
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Last edited by AmuroRay; 02-11-2020 at 11:14 AM..
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      02-11-2020, 10:33 AM   #2
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This post from JKen_0115 compares the V1 FTP with the Pure: https://f87.bimmerpost.com/forums/sh...0&postcount=86

On FTP’s site, they’re showing a measurement of 51.54mm (2.03in) for V2, which looks to still be smaller than the new Pure inlet (2.27in).

Altho, I’m hoping to hear if people are happy with the V3 of the Pure inlet that is supposed to fix some seal/leak/mount issues?
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      02-11-2020, 11:14 AM   #3
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Quote:
Originally Posted by ZM2 View Post
This post from JKen_0115 compares the V1 FTP with the Pure: https://f87.bimmerpost.com/forums/sh...0&postcount=86

On FTP’s site, they’re showing a measurement of 51.54mm (2.03in) for V2, which looks to still be smaller than the new Pure inlet (2.27in).

Altho, I’m hoping to hear if people are happy with the V3 of the Pure inlet that is supposed to fix some seal/leak/mount issues?
Awesome!! Thank you, that was what I was looking for!

I emailed MST this morning looking for their ID as well.
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      02-11-2020, 06:10 PM   #4
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Didn't realise FTP or pure have has design work done.

Can confirm V2 FTP inlet pipe out in the wild, contacted an ebay reseller that confirmed V2 is out. very cheap compared to the pure, tempted one day.

Can't see any evidence of a V3 Pure pipe?

Last edited by 3t3p; 02-12-2020 at 06:15 AM..
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      02-13-2020, 10:51 AM   #5
AmuroRay
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MST sent me an email this morning

‘Thanks for contacting us.
Ours is direct in kit. The inner diameter of our V1 is 47mm, V2 is 56.5mm.’


Measurements in American Freedom units (Dumb, I know - but consistent)
MST V1 -1.85”
MST V2 - 2.27”
Pure - 2.27”
FTP V1 - 1.87”
FTP V2 - 2.03”
Stock - 1.83”

Last edited by AmuroRay; 02-14-2020 at 09:57 AM..
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      02-13-2020, 10:59 AM   #6
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Didn’t know about the MST pipe.

You guys like the Pure or MST more?
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      02-13-2020, 11:30 AM   #7
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Quote:
Originally Posted by ZM2 View Post
Didn’t know about the MST pipe.

You guys like the Pure or MST more?
I like the looks of the MST. The Pure has a funky looking transition.
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      02-13-2020, 12:06 PM   #8
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I'm not sure if silicone is a good choice for our inlet pipe. Can it withstand the heat from being near the exhaust while under boost? Anyone have any specs on this?
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      02-13-2020, 05:03 PM   #9
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Wait, so MST V1 narrower than stock?!
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      02-13-2020, 11:12 PM   #10
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Quote:
Originally Posted by 3t3p View Post
Wait, so MST V1 narrower than stock?!
Yeah, but stock actually does get even more narrow.
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      02-14-2020, 03:59 AM   #11
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Quote:
Originally Posted by AmuroRay View Post
Yeah, but stock actually does get even more narrow.
Are you sure MST v1 isn't 1.83" ID ie same as stock given they quoted 47mm to you ??
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      02-14-2020, 07:59 AM   #12
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Quote:
Originally Posted by Bee Pee View Post
Are you sure MST v1 isn't 1.83" ID ie same as stock given they quoted 47mm to you ??
Good catch. Looks like his American freedom units conversion is off.
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      02-14-2020, 09:56 AM   #13
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Quote:
Originally Posted by ZM2 View Post
Good catch. Looks like his American freedom units conversion is off.
47mm is 1.85” the measurements comes from MST directly. If you look at the coupling, it’s believable.

My conversation was off, updated.
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      02-14-2020, 11:37 AM   #14
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Quote:
Originally Posted by AmuroRay View Post
47mm is 1.85” the measurements comes from MST directly. If you look at the coupling, it’s believable.

My conversation was off, updated.
So, the MST V2 to inches conversion isn’t right either, assuming the mm listed for MST are correct here’s what I’m coming up with:

MST V1 -1.85”
MST V2 - 2.22”
Pure - 2.27”
FTP V1 - 1.87”
FTP V2 - 2.03”
Stock - 1.83”
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      02-14-2020, 11:56 AM   #15
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Quote:
Originally Posted by ZM2 View Post
So, the MST V2 to inches conversion isn’t right either, assuming the mm given by MST are correct.
I literally used google in browser to do it - how are they BOTH wrong
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      02-14-2020, 11:59 AM   #16
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Quote:
Originally Posted by AmuroRay View Post
I literally used google in browser to do it - how are they BOTH wrong
No idea, but 25.4mm per inch has been burned into my brain since engineering school and my Google spits out the right numbers.

No worries, metric to imperial conversion fails only blow up space rockets and stuff.
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      02-14-2020, 02:09 PM   #17
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Any particular reason why you'd go for the narrower diameter for the MST? It's an option for 'Stock' vs 'Hybrid' turbo.

Surely even if you were going to stick with stock forever, a larger diameter would not be a negative? Perhaps to avoid the hard transition to the narrower aperture at the turbo itself?
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      02-14-2020, 05:29 PM   #18
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Quote:
Originally Posted by Nezil View Post
Any particular reason why you'd go for the narrower diameter for the MST? It's an option for 'Stock' vs 'Hybrid' turbo.

Surely even if you were going to stick with stock forever, a larger diameter would not be a negative? Perhaps to avoid the hard transition to the narrower aperture at the turbo itself?
No reason I can think of - nor would I change a lot of parts that don’t add power of break like boost pipes etc.

Get the Hybrid option or the Pure Unit.
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