Turbo sizing for 427
LSX based or LS7 based 427 and what vehicle? In my case I'm looking at the F1A Procharger kit or the Huron Speed APS twin turbo kit and just go with the largest ones they offer which should be plenty.
I second the Aps style twin turbo kit. I wish there was an example of the 67/66 turbos on here to see what’s possible. I’m definitely going this route with my next build.
Yeah, need a lot more info like motor details, intended use/goals, fuel type.
As an example I'm running a pair of Gen2 Precision 6870s on an LS7 based 427 solid roller setup and they are about done at 26-28 psi of boost on ethanol.
As an example I'm running a pair of Gen2 Precision 6870s on an LS7 based 427 solid roller setup and they are about done at 26-28 psi of boost on ethanol.
At minimum i would 78/75 / 76/75, basically with anything that has larger turbine than 75mm. I would do something like a s400 chassis with a 83mm turbine wheel. Another good option would be the G140S 7975 from WORK Turbo.
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Thread Starter
Teching In
Joined: Sep 2022
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So you are trying to package this into a C6 Z06? Are you sticking them out of the hood? Trying to mount them low? Exhaust out the rear? The packaging in the C6 Z06 is going to be your big hurdle and turbo sizing will be highly dependent on what you are trying to do with it. Technically I should be running larger turbos on mine BUT I already had to cut, grind, and modify a ton of **** just to put 6870s down low so I could keep exhaust going out to the rear and not have them sticking out of the hood.
So you are trying to package this into a C6 Z06? Are you sticking them out of the hood? Trying to mount them low? Exhaust out the rear? The packaging in the C6 Z06 is going to be your big hurdle and turbo sizing will be highly dependent on what you are trying to do with it. Technically I should be running larger turbos on mine BUT I already had to cut, grind, and modify a ton of **** just to put 6870s down low so I could keep exhaust going out to the rear and not have them sticking out of the hood.
Thread Starter
Teching In
Joined: Sep 2022
Posts: 18
Likes: 0
So you are trying to package this into a C6 Z06? Are you sticking them out of the hood? Trying to mount them low? Exhaust out the rear? The packaging in the C6 Z06 is going to be your big hurdle and turbo sizing will be highly dependent on what you are trying to do with it. Technically I should be running larger turbos on mine BUT I already had to cut, grind, and modify a ton of **** just to put 6870s down low so I could keep exhaust going out to the rear and not have them sticking out of the hood.
OK so for the stealth look you are pretty much stuck to having them where I put them or putting them in the fenders but then you lose your dry sump tank, assuming you have a C6 Z06. Space constraint is going to be your biggest obstacle and biggest limiting factor for turbo sizing and it will be a compromise and you MUST pay close attention to heat mitigation as well.
Fender route is nice, but snaking the pipes through seems like a PITA...
This guy on YouTube did that... clean install.
https://youtu.be/X29K8g8DdaM
This guy on YouTube did that... clean install.
https://youtu.be/X29K8g8DdaM
Still not really enough info to give a good recommendation on but I would do a pair of S485/96's on a 427 personally. Do a smaller tighter exhaust housing if you are worried about spool or the larger housing if you want to make big power.
I swear, I always think I have it bad trying to fit all my junk together, until I see these builds. I think that's why I enjoy them so much, because I know how much work it is to make it all fit, and function and still look nice!
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Teching In
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Really liked how this guy setup the twins on his vette, my not be applicable or solve the size issue but I thought it worth mentioning.
1999 FRC Pro Mod Style TT Kit - LS1TECH - Camaro and Firebird Forum Discussion
1999 FRC Pro Mod Style TT Kit - LS1TECH - Camaro and Firebird Forum Discussion