Downpipes

nj335i · 09-27-2007, 01:41 PM

I see that the RR downpipes don't have as many welds as the UR ones. I assume that welds are weaker, but at what point would we have to worry about the welds failing? Should only people who track their cars worry about this?

533ogetnom · 09-27-2007, 01:48 PM

welds aren't weaker by the way, the pipes as a whole may be, but not the welds specifically

sorry thats been bothering me for awhile

BoostedBMW · 09-27-2007, 02:17 PM

On my turbo s2k I had my turbo manifold/downpipe made by the same fabricator and my manifold cracked twice where it was welded around the wastegate flange, but my downpipe (which also took abuse from some vibrations) never cracked. My point is that downpipes get hot, but not nearly as hot as a manifold, so if the welds are good there should be no problems.

Ultimate Racing · 09-27-2007, 02:39 PM

You shouldn't have to worry about our welds failing. We've been fabricating (welding) products for various cars for almost 2 decades. It's what we do best. We also offer a 5-year warranty against cracks. We offer a warranty like this simply because we don't get returns.

Darryl
www.ultimate-racing.com

Neema · 09-27-2007, 02:59 PM

Quote:

Originally Posted by Ultimate Racing

You shouldn't have to worry about our welds failing. We've been fabricating (welding) products for various cars for almost 2 decades. It's what we do best. We also offer a 5-year warranty against cracks. We offer a warranty like this simply because we don't get returns.

Darryl
www.ultimate-racing.com

nicely stated, and reassuring

Mr. 5 · 09-27-2007, 03:23 PM

Quote:

Originally Posted by Ultimate Racing

You shouldn't have to worry about our welds failing. We've been fabricating (welding) products for various cars for almost 2 decades. It's what we do best. We also offer a 5-year warranty against cracks. We offer a warranty like this simply because we don't get returns.

Darryl
www.ultimate-racing.com

Wow, one score! That's a long time.

Darryl, I took your product (high flow cat DPs) into my work before I installed them and the engineers were absolutely amazed at the quality of the UR downpipes. To put this in perspective, I work at the Naval Surface Warfare Center, and the engineers that I talked to work in the mechanical lab dealing with tight specifications on gun gauges. They are extremely anal.

With that said, I just saw the pictures of the RR pipes, and they also look very nice. I really like how they managed to fit the 3" pipes in that tight space. I see it being a little harder for them to attach high flow cats though.

CASHBY · 09-27-2007, 09:38 PM

also the RR will be one full mandrel bent peice... the one they posted was just the prototype and it only had 2 welds. its not the final.

Mr. 5 · 09-27-2007, 11:21 PM

Quote:

Originally Posted by CEA 3

also the RR will be one full mandrel bent peice... the one they posted was just the prototype and it only had 2 welds. its not the final.

That's good to know because I did notice the welded areas.

CASHBY · 09-27-2007, 11:23 PM

Quote:

Originally Posted by Mr. 5

That's good to know because I did notice the welded areas.

its still complete mandrel bend on the prototype... mandrel bend means the bends are mandrel... the welds on the straight part are nothing to do with mandrel bend.

however the final will be all.

doba_s · 09-28-2007, 12:20 AM

hard to compare since we didn't see the finished product from RR

ironic · 09-28-2007, 10:19 AM

look forward to seeing it tho, that or i'll be tlaking to uR

stressdoc · 09-28-2007, 10:37 AM

Q is kind of pointless until we see the RR...

nj335i · 09-28-2007, 10:41 AM

Looks like we can't go wrong with either UR or RR. Since mandrel bends preserve the diameter of the bend, does the UR downpipe also have consistent diameter throughout the pipe using welds?

Ultimate Racing · 09-28-2007, 11:30 AM

Quote:

Originally Posted by nj335i

Looks like we can't go wrong with either UR or RR. Since mandrel bends preserve the diameter of the bend, does the UR downpipe also have consistent diameter throughout the pipe using welds?

Definitely. We use casted 304 stainless steel elbows that are 100% true and uniform in diameter throughout.

Darryl
www.ultimate-racing.com

nj335i · 09-28-2007, 11:48 AM

Quote:

Originally Posted by Ultimate Racing

Definitely. We use casted 304 stainless steel elbows that are 100% true and uniform in diameter throughout.

Darryl
www.ultimate-racing.com

That's great to hear. Thanks for all the information you provided in this thread!

Ultimate Racing · 09-28-2007, 12:19 PM

Here are some pictures I took of the 304 stainless steel bends we use in-house.

Darryl
www.ultimate-racing.com

09-27-2007, 01:41 PM	#1
nj335i Modaholic 88 Rep 1,705 Posts Drives: with 3 pedals Join Date: Jan 2007 Location: East Coast iTrader: (7)	Downpipes - RR vs UR I see that the RR downpipes don't have as many welds as the UR ones. I assume that welds are weaker, but at what point would we have to worry about the welds failing? Should only people who track their cars worry about this? __________________ Euro Delivery - April 2007
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09-27-2007, 01:48 PM	#2
533ogetnom Banned 95 Rep 1,760 Posts Drives: 335coupe Join Date: Apr 2007 Location: Florida iTrader: (1)	welds aren't weaker by the way, the pipes as a whole may be, but not the welds specifically sorry thats been bothering me for awhile
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09-27-2007, 02:17 PM	#3
BoostedBMW Moderator 132 Rep 6,775 Posts Drives: TiAg E92 335 Join Date: Oct 2006 Location: Raleigh, NC iTrader: (14) Garage List 2003 S2000 [0.00]	On my turbo s2k I had my turbo manifold/downpipe made by the same fabricator and my manifold cracked twice where it was welded around the wastegate flange, but my downpipe (which also took abuse from some vibrations) never cracked. My point is that downpipes get hot, but not nearly as hot as a manifold, so if the welds are good there should be no problems. __________________ -Michael. Berlina Black S2000 CR is now in the garage l 19" Rial Daytona Race l KW V2 l Eisenhaus Race Exhaust l
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09-27-2007, 02:39 PM	#4
Ultimate Racing Lieutenant 27 Rep 469 Posts Drives: 335i, Evo VIII, WRX, STi, 350Z Join Date: Jan 2007 Location: Toronto, Canada iTrader: (2)	You shouldn't have to worry about our welds failing. We've been fabricating (welding) products for various cars for almost 2 decades. It's what we do best. We also offer a 5-year warranty against cracks. We offer a warranty like this simply because we don't get returns. Darryl www.ultimate-racing.com
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09-27-2007, 09:38 PM	#7
CASHBY 168 Rep 2,114 Posts Drives: E90 335 "done up" Join Date: Dec 2006 Location: GARAGE iTrader: (2)	also the RR will be one full mandrel bent peice... the one they posted was just the prototype and it only had 2 welds. its not the final.
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09-28-2007, 12:20 AM	#10
doba_s Major General 405 Rep 6,107 Posts Drives: X7 l Cayenne l 997.2RS Join Date: Sep 2006 Location: Danville iTrader: (26)	hard to compare since we didn't see the finished product from RR
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09-28-2007, 10:19 AM	#11
ironic Major General 254 Rep 8,338 Posts Drives: Jet Black 335i Join Date: Dec 2006 Location: San Francisco, Ca iTrader: (22)	look forward to seeing it tho, that or i'll be tlaking to uR __________________ Widebody 335i Project Car BUILD \| PHOTOSHOOT
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09-28-2007, 10:37 AM	#12
stressdoc Moderator 618 Rep 10,855 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	Q is kind of pointless until we see the RR... __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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09-28-2007, 10:41 AM	#13
nj335i Modaholic 88 Rep 1,705 Posts Drives: with 3 pedals Join Date: Jan 2007 Location: East Coast iTrader: (7)	Looks like we can't go wrong with either UR or RR. Since mandrel bends preserve the diameter of the bend, does the UR downpipe also have consistent diameter throughout the pipe using welds? __________________ Euro Delivery - April 2007
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09-28-2007, 12:19 PM	#16
Ultimate Racing Lieutenant 27 Rep 469 Posts Drives: 335i, Evo VIII, WRX, STi, 350Z Join Date: Jan 2007 Location: Toronto, Canada iTrader: (2)	Here are some pictures I took of the 304 stainless steel bends we use in-house. Darryl www.ultimate-racing.com
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