c5vette211

I have searched until my eyes have fallen out of socket and my brain has processed enough opinions but I want a real life hard evidence answer to this question..... What size and type of piping should I use with my TT rearmount setup. I am running twin precision sc61 compressor .70 exhaust .81. I am going to do a y pipe for exhaust at the bell housing then another y pipe in the rear feeding each turbo. I will be using stock ls6 exhaust manifold. I wanted to do a 3" from the manifold all the way back to the turbos, then 2.5 on the charge side from the turbos to the intercooler. maybe step down at the a-arm or a square pipe for clearance. I will be wrapping and ceramic coating everything. so I wanted to use a low cost seamless steel because i did not see a reason to use a 316 stainless if i am coating and wrapping. then use seamless aluminum for the charge side and coating and wrapping this as well. i realize that there is a general science to this but is there an application science to this based on turbo size, psi, etc.? again I am looking for reasons not just "use stainless steel everyone else is.... " any help is appreciated.... except useless info...

ttz

You're not going to be too happy with that size of turbos. I just finished my custom twin rear mount on my z and its got some lag. I don't start to build boost until about 3k. Thats with 2 GT35's with .48 turbine housings. All hot side heat wrapped as well. You're .81s are going to take forever.

c5vette211

I have these turbos and have tried to sell them and or trade them with no luck, so I figured I would at least throw them on and see where it gets me. I am not looking for crazy numbers as my intentions are to have a really sweet street car. that's about it besides trying to keep stock engine in tact. so i didnt want to dump money into making these turbos better for my application but if i did what would you recommend i change?

danieloneil01

Can you just do a single?

c5vette211

see below

c5vette211

haha I have a entire thread discussing this and the general opinion was one is too small and two is too big..... FML I would like to do single its an sc61 compressor .70ar and exhaust .81 I am not trying to buy new turbos so that's out. so can anyone suggest how to make one or two of these work for me.

StatmanRN

One thing to consider on the hot side is that if you have rust flake off on the inside of the steel tubing the turbos will not like it. Wrapping is a good idea from a heat standpoint, but I have found it accerates oxidation on uncoated steel headers at least
You are removing the cats, right?
Still think youre a little big unless you just want top end. I think in the end you wont be happy with the response and end up changing anyway.

sabastian458

Why not fender mount both turbos? Save on piping, oil feed/supply, and savage pump costs.

c5vette211

thought about it I read some of your thread last night. these are big turbos so space is the key

c5vette211

after a discussion with the guys at Precision today, they recommended I stay away from a twin setup with these turbos. With the best piping in the world i would have horrible response. so I am going to try for a single with a 60+mm wastegate and get what I can out of it even if its only 450-500rwhp. so given that info any new suggestions on piping size and efficiency?