GrayZee Posted April 12, 2008 Share Posted April 12, 2008 Ok, looks like I will be getting back to working on my car soon and my thoughts turn to making my downpipe. I never did like the idea of welding on to the Dodge cast iron elbow, not to mention that I never got one when I bought my Holset. This is how I plan to make one.. First I will get a flange laser cut into a circle with the same OD as the Holset's Vband OD. There will be a round hole in the center with the same ID as the exhaust pipe (in my case 3.5") Afterwards the "ring" will be machined with a bevel to match that of the Vband. The material will be mild or stainless steel that can easily be welded to the rest of the exhaust system. Making this peice will cost me a few bucks so I am on here checking to see if there is interest in making a run of them rather than just a single unit for myself. Anyone who is interested, please chime in. Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted April 12, 2008 Share Posted April 12, 2008 There is a guy that sells them on ebay from time to time. I have been looking for his info for weeks but i cant find it. does anybody know who he is?? Quote Link to comment Share on other sites More sharing options...
Guest 280ZForce Posted April 12, 2008 Share Posted April 12, 2008 I have a holset elbow that I don't need... PM me if interested. Quote Link to comment Share on other sites More sharing options...
GrayZee Posted April 12, 2008 Author Share Posted April 12, 2008 There is a guy that sells them on ebay from time to time. I have been looking for his info for weeks but i cant find it. does anybody know who he is?? I did not realise that, if you can find info please let me know! Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted April 12, 2008 Share Posted April 12, 2008 ive been looking for weeks and cant find him. but i know i saw it like right before i got my holset. Quote Link to comment Share on other sites More sharing options...
nick.mitchell69 Posted April 12, 2008 Share Posted April 12, 2008 well,i just had a flange made up at an engineering shop for real cheap here in South Africa,was cheaper than buying a pre-made one.... Quote Link to comment Share on other sites More sharing options...
TrumpetRhapsody Posted June 27, 2009 Share Posted June 27, 2009 Anything ever come of this GrayZ? I'm starting to gather materials for my holset addition, and a DP is high up on the list Quote Link to comment Share on other sites More sharing options...
turborust Posted June 27, 2009 Share Posted June 27, 2009 I made this downpipe, for a Holset HE351CW turbo, from a 4" v flange, 4" 45 degree pipe and a 4" to 3" transition a couple of years ago. Quote Link to comment Share on other sites More sharing options...
TrumpetRhapsody Posted June 27, 2009 Share Posted June 27, 2009 Jeffer provided me with a cheap source for v-band clamps and flanges here: http://www.siliconeintakes.com/product_info.php?cPath=10&products_id=326&osCsid=11cc2884380436dc4101e5044ca60900 He also mentioned that the 4" had a poor fit on the Holset, and that a 3.5" would be more appropriate. He said the size reflects the ID, not the OD. Quote Link to comment Share on other sites More sharing options...
turborust Posted June 27, 2009 Share Posted June 27, 2009 I had no issue with the 4" flange and v clamp set that I had bought mating up to the holset, but it has been a while and I do not recall where I had purchased it from. Could have been columbia river mandrel or burns stainless. Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted June 28, 2009 Share Posted June 28, 2009 The 4" v-bands do work and do get the job done. I just think that the 3.5" vbands would seal alot better. Quote Link to comment Share on other sites More sharing options...
olie05 Posted July 22, 2009 Share Posted July 22, 2009 I have in hand a HY35W. I'm trying to make a downpipe for it, but I don't know which v-band flange to order. The dimensions of the turbo exhaust housing where the v-band mates up are as follows: Outer diameter of flange: 112mm (4.409") Inside diameter of turbo outlet: 94.16mm (3.70") Thickness of flange: 4.87mm (0.192") I think those are all the relevant dimensions. Now looking at the siliconehoses.com offerings it seems that the 4" v-band flange that they sell will leave the least amount of gap (difference in diameter) at the outermost diameter of both flanges (~.08" all the way around). Should I go for the 4" v-band or does the argument still stand that the 3.5" might seal better? for reference, the 3.5" v-band would leave a 0.1595" gap all the way around. Also, which turbos were you guys dealing with when you found out all the previous info? Quote Link to comment Share on other sites More sharing options...
trwebb26 Posted July 22, 2009 Share Posted July 22, 2009 IMO - I would try the 3.5" one. Either way - shame on Holset for not making the outlet a standard size. This problem is posted all over the internet. I'm halfway tempted to engineer up the matching flange size and sell the flange and v-band clamps as a set on ebay. I sure would've bought one a few months ago. For my HE351 - I ground off the v-band that is there and had my old man weld a "normal" size 4" v-band flange to it. The inside diameters of both parts match perfectly. Scroll down a bit for some pictures: http://forums.hybridz.org/showthread.php?t=149542 Quote Link to comment Share on other sites More sharing options...
olie05 Posted December 16, 2009 Share Posted December 16, 2009 Update: The siliconeintakes.com 4" v-band kit was ordered and it fit pretty well on the turbo. The outside diameter seemed to match perfectly. I will post another update when we fire up the engine and let you know if it is sealing properly. Here's the link: http://www.siliconeintakes.com/product_info.php?cPath=10&products_id=327&osCsid=55cb47693783036aea5141429f91c57a Quote Link to comment Share on other sites More sharing options...
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