T-golf mod

[Soccs]

Hey guys,

So today I was at my BMW dealer putting some parts and I was talking about the golf mod we do the bmwpe exhaust and they recommended me to put it back because this way the car looses some back pressure. What do you guys think? I think the lost of back pressure if any is very marginal...

[tuphdc]

No.

http://www.dsmtuners.com/threads/exh...essure.168578/

[Soccs]

Wow! Where were you 3 years ago! I've had a really big struggle with back pressure results with my mini, when I was designing my own custom pipe (exhaust)
This explanation is awesome!!!!

Thank you!!!

[TheSt|G]

Yup.

Long story short, back pressure is never a good thing.

[Pothole]

This is also a good example why the dealer isn't always the right place to be. In fact, I find the dealer to be useless once you have modded your car with any other than original parts.

Dealers have a tendency to use your mods for an excuse to charge extra or to use them as a cause for problems that are simply not there. I have seen this happening with my own eyes.

[Soccs]

Originally Posted by Pothole

This is also a good example why the dealer isn't always the right place to be. In fact, I find the dealer to be useless once you have modded your car with any other than original parts.

Dealers have a tendency to use your mods for an excuse to charge extra or to use them as a cause for problems that are simply not there. I have seen this happening with my own eyes.

You are definably right. Those guys aren't mechanics... They are employees of a company... But since at this specific dealer I saw tuned up m5s m3 and many other cars... With superchargers and custom exhaust I gave them a shot...

[RoundelM3]

Originally Posted by Soccs

Hey guys,

So today I was at my BMW dealer putting some parts and I was talking about the golf mod we do the bmwpe exhaust and they recommended me to put it back because this way the car looses some back pressure. What do you guys think? I think the lost of back pressure if any is very marginal...

I'm a little confused here...the BMW PE Exhaust on my '11 128i Convertible has no vacuum-operated valve; there is a peg to connect the vacuum hose from the actuator near the right rear tail light to insure there's no vacuum leak. How, then, is it possible (or necessary) to do a "golf-tee" mod to the Performance Exhaust?

And if I hear yet another bogus post about how "back pressure" in an exhaust system is somehow necessary and beneficial, I may barf all over my keyboard.

[RoundelM3]

Originally Posted by Soccs

You are definably right. Those guys aren't mechanics... They are employees of a company... But since at this specific dealer I saw tuned up m5s m3 and many other cars... With superchargers and custom exhaust I gave them a shot...

I suppose this may be the case outside the US, but I've never had the same experience. I've had a great relationship with the service advisors and the technicians who have worked on my cars, some of which were significantly modified. My guess is that they knew I was pretty knowledgeable about cars in general, particularly engines and drivetrains and didn't try to BS me - although friends of mine who used the same dealerships also reported good experiences with the service department personnel.

[Soccs]

You live in a society that the judicial system work far better than our here in Portugal...
We have great weather, great food, great landscape, great people...
But our system is 50 years behind yours...

[flinchy]

yeah, getting ideal scavenging may result in slightly more backpressure.. but it's not the backpressure that is the benefit, it's the sizing of the piping.