Dont know about THE biggest, but you can mount a pretty dang big s-400 on there. At least a 80/88 probably bigger. Hope its not gonna be a single over that size though, unless you got a magic widget that allows it to make power over 4,000 rpm. 75/88 IMO is almost too big for street use. 80/88 is pretty close to unstreetable according to a few I talked to, unless you just like to ride around blowing smoke just above idle --no load.
I know - but Charles said you can't tow with an F-350 with more than 300hp at the wheels without melting the entire drivetrain (transfer case, differentials, etc). Thought it was humorous that Charles was so adamant about the amount of HP an F350 can handle towing...
Anyways - so far I have the biggest S-4XX turbo you can find?
Dont forget the brakes issues andrew had also......lol
But , yeah, I only had to machine a little off the very bottom of the s-400 exhaust flange to bolt directly on my h2e kit, could just grind it off easily. Bolt holes lined right up, no clearancing at all. This is a 3" inlet turbo, I think Dave told me he could go a good bit bigger.
I "think" the reason for that specific HP number (actual output at the rear wheels while towing)was that is the power he kept smoking his rear dif and BTS trannys at with his. He is the only one I know that regularly tows heavy loads at three digit speeds 300 HP is a #### load at the wheels for sustained heavy towing. Reading the way he runs those loads that drivetrain take s serious beating.
Bullseye power makes a 91mm version of the S400 but it has their own race cover thats 1" larger in diameter, and its a 96mm turbine exducer IIRC so there.
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