800HP and a 4l80e

[Yenko boy]

Could someone please tell me what type of modification would be needed for a 4l80e to survive a supercharged or turbo BBC putting out 800RWHP/TQ? Thanks...
Anthony

[Steve Chryssos]

I answered over on lateral-g.net, but it's a great question, so I'll share here as well.

300M input/intermediate shafts, 34 element intermediate sprag, specific frictions and bands. And a stout billet torque converter. 80's are pretty tough. Actually I believe that the most important part is blueprinting and calibrating the trans so that it shifts quickly. 80's tend to shift lazy. Blower/Turbo engines accelerate super quickly. If the trans takes it's sweet time shifting, you'll end up against the rev limiter regularly. So the builder is just as important as the parts.

http://www.bowlertransmissions.com/i...ils.aspx?iid=9

We just ordered a new valve body from Bowler to speed up the shifts in one of our house cars with a Hughes trans. I hope it helps.

[MJ_Bone]

I've got one of Rossler's 4L80s in my 425 rwhp Camaro. The trans is his level one model. It has his trans-brake and some minor internal upgrades and tweaks. I'm running a Yank SS4000 converter. It's a bit loose at low rpm but this thing shifts lightning fast and the converter launches the car like a mofo.

I figure I should be OK if I were to install a Procharger which would add another ~140 hp. I might need a different converter though.