No 128i Love :(

[Obioban]

Originally Posted by andrey_gta

I said what i said based on the bends as below:
Exhibit A: n52


Exhibit B: e46 m3 SS v1 step:


They share the same curves into the bank collectors.
V2 step is different:


V2 Header version, non step, also called Eurostyle, i guss from CSL version:


Therefore n52 Schmiedmann most closely resemble the V2 non-step. While V1 step is most related to n52 SS.


Which is best i dont know, the forums have mixed dynos, I assume v2 step is better since it costs the most. Do you know?

V1 stepped is the best, but requires a SS section 1 as the header extends further back that stock.

V2 stepped makes marginally less power but fits on RHD cars and works with the stock section 2 if desired.

Non stepped e46 fitment header... is a relic, I don't know why they still offer it. Anyone who buys it is a fool, as it makes less hp and torque at every RPM. Amusingly, most ebay replica headers are based on these.

The steps are a pretty significant design feature the alter the flow... which, imo, make them nothing like the n52 header (which isn't to say the N52 header should be stepped, I'm sure they tested that-- seems to be very high RPM engines that really benefit from the steps).

Good read on header design, if you have some time: http://www.epi-eng.com/piston_engine...technology.htm

[Pothole]

Well we can all agree on the poor finish. It was the first thing that caught my eye!

They are however very cheap! And, most of all, we have experienced some 128i love!

This piece is also on the Schmiedmann website:



Is this just added weight or does it really improve the handling?

Only 125 bucks here in Holland!

Post edit:

How about these carbon.. (i'm sorry I do not know the english words for it) floors for the e82:

http://www.motorsport24.de/motorspor...1er::1939.html

Now there is a lot of racing stuff on here, rollcages, lightweight doors, bubble hoods, carbon roofs, racing wheels, carbon centre console, carbon dashboards and more. Enjoy guys

[TheSt|G]

Brace looks interesting, though I'm sure shipping will crush you in the states.

The carbon fiber only looks applicable for race use.

[kobeballer96]

Post the link to the underbody brace. I will buy It right now, shipping to DE shouldn't. Be much

[631twentyeighteye]

The metal brace interests me, my stock one is bent to shit after i ran over a giant rock. it also claimed a little chunk my diff and dented all sorts of things.

[andrey_gta]

The brace is a great find, it can be found on ebay much cheaper because the mfg accepts on occasion a Best offer.

The 335i had one made by some vendor here, it was massive.

[Obioban]

The question is, is it actually beneficial. Modern BMW chassis designs are pretty damn stiff, stock.

[Pothole]

Originally Posted by kobeballer96

Post the link to the underbody brace. I will buy It right now, shipping to DE shouldn't. Be much

http://www.schmiedmann.de/1er_Reihe/...e2.htm#1944078

There you go! (It's in stock in Germany!)

[kobeballer96]

Originally Posted by Pothole

http://www.schmiedmann.de/1er_Reihe/...e2.htm#1944078

There you go! (It's in stock in Germany!)

Ordered! it ships out Monday haha. I'll let you guys know of I notice a difference in chassis stiffness.

[kobeballer96]

Originally Posted by Pothole

http://www.schmiedmann.de/1er_Reihe/...e2.htm#1944078

There you go! (It's in stock in Germany!)

Ordered! it ships out Monday haha. I'll let you guys know of I notice a difference in chassis stiffness.

[kobeballer96]

Originally Posted by Pothole

http://www.schmiedmann.de/1er_Reihe/...e2.htm#1944078

There you go! (It's in stock in Germany!)

Ordered! it ships out Monday haha. I'll let you guys know of I notice a difference in chassis stiffness.

[andrey_gta]

Interesting development..
Try to drive the same road for a few days before the install.

[Solo_M_Tech]

I think it's interesting. Subaru owners understand chassis bracing all too well, and they are known for having a rigid body. I'm very interested to see just how much of an improvement this brace will give. I fear it's a waist of 125 bucks and 20 pounds. I could be way wrong though. Front and rear subframe braces on my wrx made a night and day difference, but made EVERY panel in the car rattle and vibrate like crazy. Keep us posted!

[TheSt|G]

Originally Posted by Sinister_1

I think it's interesting. Subaru owners understand chassis bracing all too well, and they are known for having a rigid body. I'm very interested to see just how much of an improvement this brace will give. I fear it's a waist of 125 bucks and 20 pounds. I could be way wrong though. Front and rear subframe braces on my wrx made a night and day difference, but made EVERY panel in the car rattle and vibrate like crazy. Keep us posted!

Japanese car owners are also known for bling bracing, much like Americans love chrome.

[Solo_M_Tech]

Originally Posted by TheSt|G

Japanese car owners are also known for bling bracing, much like Americans love chrome.

Lol very true! I hated how cheap my wrx felt. BMW 128i's are more fun and WAY better in terms of quality. Did you get me pm?

[TheSt|G]

Originally Posted by Sinister_1

Lol very true! I hated how cheap my wrx felt. BMW 128i's are more fun and WAY better in terms of quality. Did you get me pm?

Right!

On it.

[Taskmaster]

The header will probably make as much as power as the SS one.

[TheSt|G]

Originally Posted by TheAxiom

The header will probably make as much as power as the SS one.

Based on?

[Taskmaster]

Originally Posted by TheSt|G

Based on?

Personal experience. Pipe length and tube diameters. The SS looks like it uses a better collector, but otherwise they look similar and should produce similar numbers.

Do you disagree? And if so why?

[andrey_gta]

Originally Posted by TheAxiom

Do you disagree? And if so why?

Based on images, the Schmiedmann S-Tech isnt equal length to the collector. SS manages to be more equal length.

I know e46fanatics were interested in Schmiedmann header + midpipe set up, some may have install them. Do you recall their experiences?

[Taskmaster]

Originally Posted by andrey_gta

Based on images, the Schmiedmann S-Tech isnt equal length to the collector. SS manages to be more equal length.

I know e46fanatics were interested in Schmiedmann header + midpipe set up, some may have install them. Do you recall their experiences?

No one came through (from what I remember), but equal length from my experience, doesn't change higher RPM power, but it does add some more lower end torque.

[TheSt|G]

Originally Posted by TheAxiom

Personal experience. Pipe length and tube diameters. The SS looks like it uses a better collector, but otherwise they look similar and should produce similar numbers.

Do you disagree? And if so why?

Originally Posted by TheAxiom

No one came through (from what I remember), but equal length from my experience, doesn't change higher RPM power, but it does add some more lower end torque.

I do disagree. These are incredibly simplistic statements about header design. "Looking similar" is a useless metric for header design. The ebay replica headers for the E46 M3 look similar to the Supersprint units, but make 10+hp less. Akrapovic replicas suffer much the same fate.

You aren't going to eyeball pressure wave velocity, pulse timing, or any of the other multitude of factors that go into proper header design.

These discussions really need to be divided into two categories. Those that remove the cat in the headers, and those that do actual R&D into a performance header.