[Utekai]

Originally Posted by shiv@vishnu

During the development period of our computer, we first got access to boost, then timing and only after that, fuel control (It's all online). The boost-only results were pretty poor lumpy and inconsistent, compared to what we got once we got timing and fuel control.

Just my 2c
shiv

Shiv,

Thanks for your comments. But how about commenting on the main topic of this thread?

What is the danger of the downpipe failing with an Xede unit?

[Mr. M]

Inconel downpipe = superior toughness + big price

[OpenFlash]

Originally Posted by Utekai

What is the danger of the downpipe failing with an Xede unit?

I think it's pretty darn unlikely. Maybe in another 10k miles (20k miles total), I'll remove my downpipes and inspect the catalysts. As far as the actual pipe cracking, I'd be amazed if that ever became an issue.

FWIW, OEs are ultra cautious/conservative when it comes to downpipe/cat longevity since they are emissions related items. Any premature failure will cost the manufacturer gobs of money since emissions law will force them to replace them on every single car, of that model, that they manufactured. Even those without a manifested problem. It's pretty much the most expensive type of recall that any company can be faced with.

my 2c,
shiv

[leftcoastman]

Can someone do the math here? If the 335i turbos are giving 0.6 bar boost at sea level and can put in 0.8 bar boost at altitude:

Will the pressure seen by the engine at 5280 feet be exactly the same as at sea level?

[Garissimo]

Originally Posted by leftcoastman

Can someone do the math here? If the 335i turbos are giving 0.6 bar boost at sea level and can put in 0.8 bar boost at altitude:

Will the pressure seen by the engine at 5280 feet be exactly the same as at sea level?

Intake manifold pressure should be the same, in theory.

Turbos will have to work harder to make up for the drop in atmospheric pressure.

[Utekai]

Originally Posted by shiv@vishnu

I think it's pretty darn unlikely. Maybe in another 10k miles (20k miles total), I'll remove my downpipes and inspect the catalysts. As far as the actual pipe cracking, I'd be amazed if that ever became an issue.

FWIW, OEs are ultra cautious/conservative when it comes to downpipe/cat longevity since they are emissions related items. Any premature failure will cost the manufacturer gobs of money since emissions law will force them to replace them on every single car, of that model, that they manufactured. Even those without a manifested problem. It's pretty much the most expensive type of recall that any company can be faced with.

my 2c,
shiv

Ok, thanks.

I'm sure if any do fail, we'll read about it here.

[max boost]

cracking???? what because the boost is raised a couple of pounds did u guys ever think since shivs got the ar more inline the egt will actually be lower??

take a look at my vette's top mount set up...
i was told that the exhuast wrap would roit out my headers in no time, well i removed wrap and it was perfect. that was after 8k miles. also with the wrap the exhuast hold much more heat, to the point were the exposed areas are cherry red. well to that end, no cracks, granted bmw down pipe and my headers are two different animals but i truly wouldnt wary about it!
[IMG][/IMG]

http://

http://i22.photobucket.com/albums/b335/NICKYOSKIN996969/BLING.jpg[/IMG][/IMG]

[Gubbins]

Originally Posted by Utekai

Ok, thanks.

I'm sure if any do fail, we'll read about it here.

I think you've pretty much summed up the situation here. We are all part of the QA program for the XEDE. If there are long term problems, they will show up here on the forum. It's all a calculated risk. Shiv is obviously very knowledgable and I have a good feeling about this product, but at the end of the day we need to acknowledge that there are risks that can only be mitigated through a substantial test and QA program. And we are the guinea pigs. Now where can I sign up?

[imsambeen]

Well I am the first Xede and so far so good. I don't see how there would be any future problems with the exhaust.
i'll keep you guys updated.

Sam