427 plus T4 flange turbo
9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
Posts: 3,672
Likes: 9
From: Colorado Springs, Co/ Central, Ca
It should be ok if taken easy but start cranking it up egt's and back psi will be thru the roof unless it is a custom large turbine T4 76. I have seen a S480 on a 522 CI BBF live for quite some time at 10~12 psi and 5500 RPM.
Teching In
Joined: Feb 2012
Posts: 7
Likes: 0
second guy has it on a built 427 and he can't control boost under 10psi and it comes on violently and then peaks at a lower RPM. It made around 1000rwhp but not the smoothest dyno graph.
The 427 car is a bit undriveable... or at least the owner thinks so as the power comes on instantly.... in a 2800lbs car
....
twins or T6 with that many cubes
The 427 car is a bit undriveable... or at least the owner thinks so as the power comes on instantly.... in a 2800lbs car
....twins or T6 with that many cubes
Sounds like a certain Red car we had on the dyno awhile back. Your last sentence was my verbatim advice about 4min. after lookin' over the setup (which has some great fabrication work). That thing would rip with a pair of those 76's. "Horse to Water".....etc.
TECH Enthusiast
Joined: Mar 2012
Posts: 728
Likes: 3
It gets out of its efficiency zone on the compressor side, not the turbine. The 1100 HP 2JZ would be flowing more exhaust than a 700 HP LS1, so to blame the turbine is incorrect.
FormerVendor
Joined: Dec 2001
Posts: 2,444
Likes: 2
From: WWW.SPEEDINC.COM
Start out with any turbo that has a good compressor/turbine ratio and the more displacement you run it with you will find power shifts to the left and max power realized will be less.
In this case of a 7675 on a 427, it would be done just after 5k rpm. Weld the wastegate shut and it wouldn't hold 20psi boost. Just all around too small of a unit for that displacement. (unless your goal is to have a very low rpm engine).
My local highly reputable shop told me that 383 is as as they would go on T4 turbo. I am having a billet 7675 put on my car now and that is what they suggested. He said anything any bigger he would have recommended a T6 but I was right in the middle ground where I could go T4 or T6.
