Holley manifold up pipe size
Thread Starter
Teching In
Joined: Apr 2011
Posts: 15
Likes: 1
Holley manifold up pipe size Hey guys. Running a cammed 6.0 with a next gen 7875. I bought everything to make the up pipe to the turbo in 2.5", 16 guage tubing. Now I'm think I might have messed up. Goals are around 600whp. My main concern is backpressure. Should I scrap it and go 3" or stick with the 2.5?
Use what fits the turbo flange best . 2.5 works very well with a t4 if you square the end of a 2.5 pipe it fit a open t4 flange great . If it’s a t6 then go 3” . I have made 727 wheel hp with a single feed 2.5 on a t4. And it really doesn’t make any sense running a bigger pipe just to neck it down .
Use what fits the turbo flange best . 2.5 works very well with a t4 if you square the end of a 2.5 pipe it fit a open t4 flange great . If it’s a t6 then go 3” . I have made 727 wheel hp with a single feed 2.5 on a t4. And it really doesn’t make any sense running a bigger pipe just to neck it down .
Thread Starter
Teching In
Joined: Apr 2011
Posts: 15
Likes: 1
Thanks for your input. This is the flange I have, I'm new to TIG welding so I wanted to make it easy on myself with the fab. My main concern was pre turbine backpressure. Especially being a cammed 6.0 with T4. My specific turbo is the VS 78/75 next gen with a 1.25 AR. Thanks again
https://www.speedwaymotors.com/T4-Tu...el,464537.html
https://www.speedwaymotors.com/T4-Tu...el,464537.html
Thanks for your input. This is the flange I have, I'm new to TIG welding so I wanted to make it easy on myself with the fab. My main concern was pre turbine backpressure. Especially being a cammed 6.0 with T4. My specific turbo is the VS 78/75 next gen with a 1.25 AR. Thanks again
https://www.speedwaymotors.com/T4-Tu...el,464537.html
https://www.speedwaymotors.com/T4-Tu...el,464537.html
Andrew
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