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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Aftermarket turbo inlet on stock turbo.
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      12-14-2019, 11:43 PM   #67
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Originally Posted by AmuroRay View Post
Quote:
Originally Posted by johnung View Post
I agree that the scientific way to test is to do before and after dyno when changing just one thing at a time. I'm still saving for my own AWD dyno. But there really aren't a lot of variables affecting the butt dyno with this mod. Install, get in, drive and clearly feel the improvement.

I've been meaning to format the MAF before and after data from three of us. Everyone's MAF values clearly increase significantly starting at 5000rpm which I understand correlates to a horsepower increase.
Do you have any logs? And what tune
Yes I have data from logs from the three cars somewhere on a laptop but not handy on my phone. I recall my MAF above 5000rpm was somewhere around 41/42. I'm running BootMod3 N55 EWG Stage2 93 Octane.
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      12-16-2019, 10:43 PM   #68
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This Turbosmart VR9... Why would I spend money on it if I already have the DV+? Turbosmart is writing reward bla bla bla, but reward for what? The sound? What does it actually do? Impressive so little information on a product they want people to buy as an upgrade.

johnung What is it your butt dyno is feeling?

Looking at this 3-4-5 pull boost is where it need to be so.... (no need to comment on the post shift overboost, this is normal for PWG)
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      12-17-2019, 12:43 AM   #69
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Originally Posted by harkes View Post
This Turbosmart VR9... Why would I spend money on it if I already have the DV+? Turbosmart is writing reward bla bla bla, but reward for what? The sound? What does it actually do? Impressive so little information on a product they want people to buy as an upgrade.

johnung What is it your butt dyno is feeling?

Looking at this 3-4-5 pull boost is where it need to be so.... (no need to comment on the post shift overboost, this is normal for PWG)
"Turbosmart is writing reward bla bla bla, but reward for what?"

"johnung What is it your butt dyno is feeling?"

It appears like you are asking me a question but I don't understand? I don't know what "writing reward" means?

Below is a link to the manufacturer website if you are looking for more information on their products.

https://www.turbosmart.com/product/b...dual-port-vr9/
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      02-10-2020, 09:15 AM   #70
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FTP came out with version 2 of the inlet pipe that is bigger. And its still $100 cheaper than the pure.

https://www.ftpmotorsport.com.tw/pro...ipe-intel-pipe
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      02-10-2020, 09:26 AM   #71
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Here are sizes
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      02-10-2020, 09:55 AM   #72
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sad they didnt revise the 5 series Models
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      02-11-2020, 04:54 AM   #73
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Originally Posted by oma3710 View Post
Here are sizes
Anyone know the size of the pure unit? I heard MST has one too.
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      02-11-2020, 05:29 AM   #74
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Originally Posted by AmuroRay View Post
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Originally Posted by oma3710 View Post
Here are sizes
Anyone know the size of the pure unit? I heard MST has one too.
The key point is that the constriction point of the stock plastic turbo inlet is removed so there is a potential for more airflow into the turbo. The size of the intake port on the turbo is the same.
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      02-11-2020, 08:40 AM   #75
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I am debating between the ftp version 2 or the pure turbo. I dont plan to upgrade to ps2 anytime soon if at all. Cant beat the price of ftp.
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      02-11-2020, 09:55 AM   #76
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Originally Posted by oma3710 View Post
I am debating between the ftp version 2 or the pure turbo. I dont plan to upgrade to ps2 anytime soon if at all. Cant beat the price of ftp.
Yeah, it's tough with a new product until enough people have tried it to verify quality and fitment. I was impressed with the Pure Turbos Inlet Pipe for quality and fitment. The installation isn't simple so I tend to be risk adverse and spend more money on parts if the labor will be costly if I have a problem.
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      02-11-2020, 10:16 AM   #77
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Quote:
Originally Posted by johnung View Post
The key point is that the constriction point of the stock plastic turbo inlet is removed so there is a potential for more airflow into the turbo. The size of the intake port on the turbo is the same.
That’s absolutely not true.

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      02-11-2020, 10:23 AM   #78
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MST offers one as well -

https://www.mst-performance.com/products/bw-mk3352v2
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      02-11-2020, 10:35 AM   #79
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Quote:
Originally Posted by AmuroRay View Post
Quote:
Originally Posted by johnung View Post
The key point is that the constriction point of the stock plastic turbo inlet is removed so there is a potential for more airflow into the turbo. The size of the intake port on the turbo is the same.
That’s absolutely not true.

Please read what I wrote again...

"The size of the intake port on the turbo is the same."

The size of the intake port on ALL N55 stock turbochargers is the same as are the outer diameter of all pipes, stock and aftermarket that plug into it.

Maybe the inside diameters of various inlet pipes are slightly different. But that's inconsequential compared to removing the constriction point of the stock inlet pipe which is not right at the pipe opening. See my previously posted photo.

Attached is the photo of the stock plastic inlet opening vs the opening of the Pure Turbos Inlet Pipe. The key part of the photo is not obvious. The outer edges of the two pipes don't matter as much as the constriction point further inside the stock pipe. The edge of it can just barely be seen inside the shadow inside the pipe on the left. I wish that I had taken the photo with a flash then it would be obvious.
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      02-11-2020, 11:30 AM   #80
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Quote:
Originally Posted by JKen_0115 View Post
Hey All,

I like to share the detail measurement for these three options. I moved from OEM to FTP to Pure now. I'm running the STG2 Custom tune with other items based on FBO. I wasn't sure if it could bring the benefit before but I would recommend Pure one since it helps actually. I feel the better on the higher RPM and it's the same result as Bee Pee said before.

- OEM and FTP are the same, est. 1.8x
- Pure one piece version, est. 2.26
https://f87.bimmerpost.com/forums/sh...0&postcount=86
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      02-11-2020, 11:55 AM   #81
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i think he's(johnung) is talking about the diameter of the hole(on the engine side)in front of the impeller, not the inner diameter of the various pipes in the comparison pics.
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      02-11-2020, 12:21 PM   #82
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Quote:
Originally Posted by alohasurftoad View Post
i think he's(johnung) is talking about the diameter of the hole(on the engine side)in front of the impeller, not the inner diameter of the various pipes in the comparison pics.
Yup, I understood that better from his second post
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      02-11-2020, 01:09 PM   #83
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I just pulled the trigger on ftp version 2 pipe. I will keep you guys posted.
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      02-11-2020, 02:51 PM   #84
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Originally Posted by oma3710 View Post
I just pulled the trigger on ftp version 2 pipe. I will keep you guys posted.
Great! Please take measurements. Also take good before and after logs. If you see a distinct increase in MAF values from 5,000rpms upward, that is what three of us with stock turbos have observed.

MAF is supposed to correlate with horsepower. I haven't run across anyone yet who has quantified it with a dyno.

Our hypothesis is that the folks are wrong who are telling us that the stock turbo is maxed out so that adding more potential intake air will not increase horsepower. The fact that eliminating the restriction in the inlet pipe increased the MAF shows that more horsepower was to be had out of the stock turbo.
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      02-11-2020, 02:53 PM   #85
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Quote:
Originally Posted by johnung View Post
Great! Please take measurements. Also take good before and after logs. If you see a distinct increase in MAF values from 5,000rpms upward, that is what three of us with stock turbos have observed.

MAF is supposed to correlate with horsepower. I haven't run across anyone yet who has quantified it with a dyno.

Our hypothesis is that the folks are wrong who are telling us that the stock turbo is maxed out so that adding more potential intake air will not increase horsepower. The fact that eliminating the restriction in the inlet pipe increased the MAF shows that more horsepower was to be had out of the stock turbo.
Exactly what hes saying here..

I couldnt prove it since i was maxing out my maf readings prior to the swap
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      02-13-2020, 10:59 AM   #86
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Measurements in American Freedom units (Dumb, I know - but consistent)

Inlet measurements

MST V1 -1.73”
MST V2 - 2.27”
Pure - 2.27”
FTP V1 - 1.87”
FTP V2 - 2.03”
Stock - 1.83”
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      02-13-2020, 11:30 AM   #87
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Originally Posted by AmuroRay View Post
Measurements in American Freedom units (Dumb, I know - but consistent)

Inlet measurements

MST V1 -1.73”
MST V2 - 2.27”
Pure - 2.27”
FTP V1 - 1.87”
FTP V2 - 2.03”
Stock - 1.83”
Cool! Thanks for posting!
Were you able to get an inside diameter measurement on the stock inlet pipe several inches inside the opening where the constriction is? Please see photo.

I have it somewhere...if I remember correctly maybe around 1.29"?
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      02-13-2020, 04:09 PM   #88
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Dang it guys.. stop doing this to me! Yet another upgrade point I am watching closely and if I should pull the trigger on this.
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