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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jun-07-2018, 07:57:32 PM   #41
silvergray545
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

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Originally Posted by Volke View Post
You're giving BMW way too much credit. The CSL box was designed back in like 2001. Take it from a hydraulics engineer, CFD simulation wasn't very good, user friendly or wide spread back then. It's pretty unlikely they even did any significant amount of it.

The only real thing that matters about the trumpets is the length and the diameter at the small end anyway. The diameter opening at the small end is restricted by having to fit up to the ITB, so that won't be any different. Unless they make the length significantly longer or shorter than the OE trumpets, which it doesn't look like they're doing, you will see zero difference in the dyno plots. Even if the length is a little different, all you will see is a small change in the RPM peak power/torque occur at. Shorter will shift the peak power a little to the right, and longer a little to the left. The trumpet opening or curvature isn't significantly different either.

The quality and fitment we will have to wait and see given their track record, but this OEM snobbiness about performance is pretty ridiculous.


Think about this for a second. Streamline can’t make a bumper fit right. To the point where the OP threw it away. You think this guy is going to beat a professional engineering team out of his garage? Everyone needs to stop thinking Streamline is the next best thing since the E46 M3.


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Old Thu, Jun-07-2018, 07:59:14 PM   #42
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

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Originally Posted by silvergray545 View Post
Think about this for a second. Streamline can’t make a bumper fit right. To the point where the OP threw it away. You think this guy is going to beat a professional engineering team out of his garage? Everyone needs to stop thinking Streamline is the next best thing since the E46 M3.


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I think the idea is that any joe blow nowadays can model fluid dynamics on any ol' computer and achieve what Williams F1 did 2 decades ago.
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Old Thu, Jun-07-2018, 08:02:56 PM   #43
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

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Originally Posted by TboneM3 View Post
I think the idea is that any joe blow nowadays can model fluid dynamics on any ol' computer and achieve what Williams F1 did 2 decades ago.
This. And we can do it faster too. For example, today we can do batch runs where you have the software automatically change a dimension in increments and spit out results for all of them. Very easy to optimize designs this way.

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Originally Posted by silvergray545 View Post
Think about this for a second. Streamline can’t make a bumper fit right. To the point where the OP threw it away. You think this guy is going to beat a professional engineering team out of his garage? Everyone needs to stop thinking Streamline is the next best thing since the E46 M3.


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Making a large, awkward piece like a bumper fit consistently in production is a lot harder than making a small trumpet. It doesn't have anything to do with design. It's an apples and oranges comparison. No aftermarket company will ever meet OE fit quality because nobody can afford to spend as much on quality molds as BMW can. The larger the piece, the harder it is.
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Last edited by Volke; Thu, Jun-07-2018 at 08:10:34 PM.
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Old Thu, Jun-07-2018, 08:07:19 PM   #44
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

I’d be more than happy to take back what I said if Streamline proves me wrong. All I’m saying is, nobody needs to know fluid dynamics to make a bumper fit.

Sorry for the “OEM snobbishness” but it’s amazing when a product fits and works as intended. And this is coming from a person that has a ton of aftermarket products on their car.


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Old Thu, Jun-07-2018, 08:28:20 PM   #45
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

For the curious, OE car bumpers are usually made with injection molding. It means they CNC machine a solid, inflexible, 2+ piece mold out of metal, put the 2 halves together and inject molten plastic into it. This is how they get consistent fit. The downside is that each mold costs likely over $50k, possibly over $100k for the set even. BMW can afford to do this because they will sell tens of thousands of the vehicles.

Aftermarket companies would be lucky to sell 10% of the BMW volumes, so they really can't afford this kind of investment. Aftermarket companies usually make a fiberglass mold using an original panel as the base and then lay the carbon fiber by hand into the mold. It's very hard to ensure a consistent output like this at a price people will actually pay. It's very hard to do. Body panels is one of those things that you're better off going OEM 80-90% of the time if you want a perfect fit.
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Last edited by Volke; Thu, Jun-07-2018 at 08:46:09 PM.
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Old Thu, Jun-07-2018, 08:33:46 PM   #46
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

Quote:
Originally Posted by Volke View Post
For the curious, OE car bumpers are usually made with injection molding. It means they CNC machine a solid, inflexible, 2+ piece mold out of metal, put the 2 halves together and inject molten plastic into it. This is how they get consistent fit. The downside is that each mold costs likely over $50k, possibly over $100k for the set even. BMW can afford to do this because they will sell tens of thousands of the vehicles.

Aftermarket companies would be likely to sell 10% of the BMW volumes, so they really can't afford this kind of investment. Aftermarket companies usually make a fiberglass mold using an original panel as the base and then lay the carbon fiber by hand into the mold. It's very hard to ensure a consistent output like this at a price people will actually pay. It's very hard to do. Body panels is one of those things that you're better off going OEM 80-90% of the time if you want a perfect fit.
This is why I asked for a picture of the fitment. There are so many replica parts out there, some fit better than others. Yes I've seen plenty of threads about bad fitment but there are some companies who seem to produce some pretty good fitting reps. I guess I just want to see how far off it really was; I want to know if it was a little off or completely off the chart with the fitment.
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Old Thu, Jun-07-2018, 08:55:19 PM   #47
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

For those asking how it fitted the pic below says it all.
We modified the crap out of the side brackets but still had a 10mm gap

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Old Thu, Jun-07-2018, 09:31:34 PM   #48
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

These were some of the fitment pictures posted in the bumper thread by a customer that received and installed their bumper from the GB thread. This one looks to fit pretty good.

That 10mm gap above is definitely unacceptable.
Attached Images
File Type: jpg one side streamline csl.jpg (513.5 KB, 146 views)
File Type: jpg otherside streamline csl.jpg (591.6 KB, 128 views)
File Type: jpg streamline csl.jpg (444.5 KB, 112 views)
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Old Thu, Jun-07-2018, 09:38:30 PM   #49
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

Don't think anyone here is saying that all of streamlines products don't fit. The glaring issue is that the consistency of their products is off. This is a larger and more evident problem when the company claims OE fitment, as Streamline did. Combine that with a terrible refund procedure and policy and you have a serious issue.
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Old Fri, Jun-08-2018, 03:25:54 PM   #50
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Default Re: Streamline bumper thrown in the trash , OE one now fitted.

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Originally Posted by ksa74f View Post
For those asking how it fitted the pic below says it all.
We modified the crap out of the side brackets but still had a 10mm gap

Not going to lie, I feel like once a bumper comes off from it's factory install, 9/10 times it won't go back on like they put it on at the factory, it's like the factory has some witchcraft to get the perfect fitment.

Joking aside, I can live with a little gap between the bumper and the light/fender, but not lining up properly would drive me insane; I mean in this picture it does not remotely line up, nevermind the gap, just look at how it won't line up. That it totally unacceptable at that price point. Maybe I'm to harsh, but I would have been very upset about this.
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Discussing Streamline bumper thrown in the trash , OE one now fitted. in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)