So I have an lly that I’m going to put rods and pistons in and I’m planning on running a stock vvt with a 66mm front cover and a 10 blade turbine. I am going to compound it as it is going to be a tow/daily drive rig. I was thinking a borgwarner s400 80/97/1.15 as the atmosphere. Would this be the proper atmosphere for this setup? Any input is appreciated
Turbo sizing trouble
- Thread starter RedChevy2005
- Start date
Have you played with BW's matchbot at all? It's taught me a lot about turbo maps and how they relate to performance.
I'm about to compound my 64mm version of your turbo, and math suggests that with a 97mm turbine you'll probably want an A/R around 1.32, or maybe higher, to avoid overspeed.
But that just my 2 cents, literally no actual experience with compounds yet
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I'm about to compound my 64mm version of your turbo, and math suggests that with a 97mm turbine you'll probably want an A/R around 1.32, or maybe higher, to avoid overspeed.
But that just my 2 cents, literally no actual experience with compounds yet
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1.32 housing is pretty common, I doubt you'll have issues with a 1.15 unless you're fueling it hard. S480 compound has been done plenty of times, it'll work
I am really hoping this is not a KB Diesel wheel/cover kit. The OEM turbine is not suitable for anything but an OEM compressor in my opinion, it doesn't have enough turbine flow to make use of a larger compressor.
What elevation do you live/drive at? How heavy are you towing? Do you have any ET/HP goals or just want a fun truck? What else is done to the truck (your signature isn't filled out so we have no clue what's done trans/injector/engine wise beyond what you listed)?
Personally I would run a 63.5-64mm in the valley (pick your flavor, we prefer JZ MFG/Fleece/RDS) and a S480/96/1.32 over top of it if you want to play or a 1.15 if it strictly will be a daily/tow rig. I have done many 63.5-64mm VGT and S480/96/1.32 setups with good tuning and been extremely happy with them as have my customers. This is a great setup for 750-800whp fairly efficiently and still drives damn near like OEM with some fuel upgrades (~100% and a 10mm or 12mm).
I would be more than happy to help set you up with a quality set of chargers if needed/desired or feel free to message me with any questions.
I was planning on using a kb diesel front cover and a 10 blade turbine, it will mostly be daily/tow and I will have a ppe stage 5 and I’m not fully decided on injectors yet
Personally I wouldn't run a 66mm compressor on a stock size turbine. It's like trying to fit a car through a door on the front of your home. The OEM sized turbine will absolutely be your limitation.
I know the super budget options like that are appealing but there is absolutely a reason why shops DO NOT recommend them. They're popular because they're cheap, not because they're good.
