big-phil Posted September 22, 2006 Share Posted September 22, 2006 I bought a holset hy35, and I've also got a 24x12x3 intercooler with 3" inlet & exit. would 3" mandrel bent tubing for the i/c plumbing be too big? I would use the 2 1/2 but I'm having trouble finding a silicone 90 deg 3" to 2 1/2" reducer for the intercooler. To make the intercooler fit I have to make a tight 90 bend at the in and out of the i/c I found a 3" silicone 90 bend for about $15 each, they want about $35 each for the reducer type. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted September 22, 2006 Share Posted September 22, 2006 I don't see how that could be a bad thing in any sense of the word. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted September 22, 2006 Share Posted September 22, 2006 Phil, are you sure you want the bend to be made from silicone? It would seem logical to me that the joint would be stronger if it were made from whatever tube you were using, and then had a straight boot. How big is your throttle body? How big is your turbo outlet? I would think your boost response would be better if you only had one diameter of tube for as long as possible, so it might be better if you had your end tanks modified to the same size as your turbo outlet on the way in, and your throttle body on the way out? Anybody that wants to correct that, jump right in! Quote Link to comment Share on other sites More sharing options...
big-phil Posted September 22, 2006 Author Share Posted September 22, 2006 the outlet on the hy35 is 3" OD and about 2.75" ID and my T/B is a 60mm Webber. Its 70mm at the opening, but then tapers to 60mm at the butterfly. I could have the i/c modified, but the silicone 90's are alot cheaper. They are the 4 layer silicone with the webbing stuff inside. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted September 22, 2006 Share Posted September 22, 2006 well, if it's already all 3", you wouldn't need to modify it anyway. In that case, I'd say going smaller than 3" would kind of be a waste of time. I guess I was confused about the real question, too. Are you asking if you should keep your old plumbing and use reducers, or upgrade to 3" plumbing? Quote Link to comment Share on other sites More sharing options...
Guest 280ZForce Posted September 22, 2006 Share Posted September 22, 2006 i used some 3"-2.5" 90* reducers...let me see if i can find the site. cheapest i found them was like $45 a piece though. oh yeah...welcome to the holset world! you will love it! Quote Link to comment Share on other sites More sharing options...
Guest 280ZForce Posted September 22, 2006 Share Posted September 22, 2006 yeah i bookmarked the site...just give them a call and place an order. mine have handled boost very nicely w/ no breaks or cracks so far, so good. now to just get it tuned for some high boost. 4th one down... http://www.boostcontroller.com/index.php?category=109&PHPSESSID=d17b5cf592bebac1982d05bb643588e3 Quote Link to comment Share on other sites More sharing options...
big-phil Posted September 22, 2006 Author Share Posted September 22, 2006 well, if it's already all 3", you wouldn't need to modify it anyway. In that case, I'd say going smaller than 3" would kind of be a waste of time. I guess I was confused about the real question, too. Are you asking if you should keep your old plumbing and use reducers, or upgrade to 3" plumbing? upgrade to 3" I got a new turbo, new i/c so I need new plumbing. Quote Link to comment Share on other sites More sharing options...
big-phil Posted September 22, 2006 Author Share Posted September 22, 2006 yeah i bookmarked the site...just give them a call and place an order. mine have handled boost very nicely w/ no breaks or cracks so far, so good. now to just get it tuned for some high boost. 4th one down... http://www.boostcontroller.com/index.php?category=109&PHPSESSID=d17b5cf592bebac1982d05bb643588e3 thanks, $49 each, ouch! I need two of them. Quote Link to comment Share on other sites More sharing options...
Guest 280ZForce Posted September 23, 2006 Share Posted September 23, 2006 thanks, $49 each, ouch! I need two of them. yeah, i ended up buying 2 of them earlier this year for my new intercooler i have on now. Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted September 23, 2006 Share Posted September 23, 2006 Where did you get your holset? Are you upgrading from the t-3? Quote Link to comment Share on other sites More sharing options...
big-phil Posted September 23, 2006 Author Share Posted September 23, 2006 Where did you get your holset? Are you upgrading from the t-3? I got it from a wrecking yard, and yes the t-3 is out the door. I'm putting on my P90 head, holset, big i/c. Now I'm looking for MSnS so I can hook up my supra 440 injectors baby!! Quote Link to comment Share on other sites More sharing options...
rztmartini Posted September 25, 2006 Share Posted September 25, 2006 hey sorry for jacking the thread here, but i didnt think it needed its own thread... my turbo outlet is 2" and i/c in/out is 3"...would it be okay to use 2" piping with reducers @ i/c ends, or from the turbo go to 2.5 inch piping and use the respective reducers? Quote Link to comment Share on other sites More sharing options...
veritech-z Posted September 25, 2006 Share Posted September 25, 2006 If your pipe is too large, it will take you longer to build boost, but if it's too small, you are just making a restriction. I'll see if I can't dig up from somewhere if there is a rule of thumb for tube sizing. My gut reaction is to keep it the same size as the compressor outlet at least to the intercooler, and then use your size changing adapter at the end tank, then use the same size coming out as your throttle body inlet. I think that's gone over in Maximum Boost, I'll have to check when I get home. Quote Link to comment Share on other sites More sharing options...
Sparky Posted September 25, 2006 Share Posted September 25, 2006 Check in this thread for the calculations needed to determine proper size- http://forums.hybridz.org/showthread.php?t=78488&highlight=intercooler I ended up going with 2.25 and think its perfect for me. in the above post its mentioned that you should only run the larger size if your planning on making more than 500hp because it will have an effect on intercooler effeciency. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted September 26, 2006 Share Posted September 26, 2006 got a Holset huh? hurrm your gonna love that one.. have fun making the downpipe.. and finding an airfilter that was a bitch Quote Link to comment Share on other sites More sharing options...
big-phil Posted September 26, 2006 Author Share Posted September 26, 2006 Check in this thread for the calculations needed to determine proper size- http://forums.hybridz.org/showthread.php?t=78488&highlight=intercooler I ended up going with 2.25 and think its perfect for me. in the above post its mentioned that you should only run the larger size if your planning on making more than 500hp because it will have an effect on intercooler effeciency. Thanks, thats a good read. I wont be at the 500hp mark, I'm hoping for at least 350hp. But everything on my car is about 3" from turbo to TB. So what the heck I guess I'll go with the 3" pipe?? How much hp at the crank is 350 whp? would crank hp be what you would use? or would it be fly wheel hp? Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted September 26, 2006 Share Posted September 26, 2006 would crank hp be what you would use? or would it be fly wheel hp? Most people say "Crank HP" but, since the flywheel is dircetly bolted to the crank I guess you could use either term. A general rule of thumb say you have 15% diveline loss. So multiply 350 by 15% and theres you #. I've read as much as 25% is lost in the drivetrain but, I'm pretty conseravtive so I use the 15% number. Quote Link to comment Share on other sites More sharing options...
Thumper Posted September 26, 2006 Share Posted September 26, 2006 Phil just found this thread. I believe you can use a 2.75" to 2.5" adapter for the outlet on the turbo. This is a new holset hy with the 90 turn on the compressor side correct? Also I have a 4" k&n filter for the turbo if you need it. Quote Link to comment Share on other sites More sharing options...
rztmartini Posted September 26, 2006 Share Posted September 26, 2006 I've read as much as 25% is lost in the drivetrain... isnt that only for FWD? RWD shouldnt be loosing that much... Quote Link to comment Share on other sites More sharing options...
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