I have a 1.5" bellows section that I will be going after the wastegate and before the downpipe (the wastegate is routed into the downpipe). This will be a 3" downpipe with it's own bellows as well. Does it matter if my bellowed 1.5" pipe joins my 3" downpipe before or after the 3" bellows? I wouldn't imaging that the thermal expansion/contraction would be that great that it would matter, but I wanted to get some opinions on this.

 

Anyone? Bueller?

 

Perhaps a diagram would help?



VS.



or does it even matter as long as the wastegate tie-in tube has one?

 

picture #2

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RTErnie &raquo;</TD></TR><TR><TD CLASS="quote">picture #2</TD></TR></TABLE>

x2

 

Ya my vote is picture 2 as well. They will both work but the first picture will strain the wastegate pipe when the engine torques. Where as in the second picture the exhaust pipe will take all of the bending and the wastegate dump will just add ease of installation.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RTErnie &raquo;</TD></TR><TR><TD CLASS="quote">picture #2</TD></TR></TABLE>

Can you form that in a question please ?

I will say What is picture number 2 ?

 

why would picture #2 be better?

wouldnt you want them to flex at the same spot? if you have them flex at different spots wouldnt it bind?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.E.G. &raquo;</TD></TR><TR><TD CLASS="quote">why would picture #2 be better?

wouldnt you want them to flex at the same spot? if you have them flex at different spots wouldnt it bind?</TD></TR></TABLE>That was my thought as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.E.G. &raquo;</TD></TR><TR><TD CLASS="quote">why would picture #2 be better?

wouldnt you want them to flex at the same spot? if you have them flex at different spots wouldnt it bind?</TD></TR></TABLE>

Ive done SOLID recircs before on my personal car. Meaning..i had no 1.5" flex section. I just ran it into the downpipe and it was also solid.

My reasoning:
1.5" flex section is so that when your manifold/downpipe heats/contracts its still easy to bolt your downpipe/dumptube combo onto your turbo/wastegate.

3" flex section is so that when your engine flexes against the chassis...your joint between the exhaust and downpipe can flex.

so IMO...if you did it like picture 1...both flexes would be sharing the load of the exhaust system... making the 1.5" flex section dynamically loaded and will most likely cause premature failure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RTErnie &raquo;</TD></TR><TR><TD CLASS="quote">

Ive done SOLID recircs before on my personal car. Meaning..i had no 1.5" flex section. I just ran it into the downpipe and it was also solid.

My reasoning:
1.5" flex section is so that when your manifold/downpipe heats/contracts its still easy to bolt your downpipe/dumptube combo onto your turbo/wastegate.

3" flex section is so that when your engine flexes against the chassis...your joint between the exhaust and downpipe can flex.

so IMO...if you did it like picture 1...both flexes would be sharing the load of the exhaust system... making the 1.5" flex section dynamically loaded and will most likely cause premature failure.</TD></TR></TABLE>

Exactly.. in picture 2 the engine flex is absorbed by the large flex. The small flex is joining two pieces that both flew at the same rate so its only there to ease with install.

 

anyone know where can i buy these bellows? or a 40mm flex pipe:S ?

thanks

 

probably the closest you'll get....
http://vibrantperformance.com/...1fecf

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Wonderfull &raquo;</TD></TR><TR><TD CLASS="quote">bellows on the wg recirc will haelp absorb anny bending, flexing, or changing the downpipe may go through... I had mine without it the first tiume... Its much more manageable with the little flex.

AT least it was for me.</TD></TR></TABLE>Exactly why I'm doing it. The down-pipe will always have hot air flowing through it, while the wastegate down-pipe will only have air flowing through it part of the time. This heat difference will cause one pipe to expand/stretch while the other will not, causing major stress on the welds. So, add a flex section and the problem is solved.