What would I need to strengthen the bottom end...?

[add heywood]

my view is the initial limit is the rods, maybe the L19 will come in handy depending on boost, but everything else (caps etc) comes later

 

the rods are marginal somewhere up around the 850rwhp mark on a dyno dynamics (rwhp not bhp) in shootout6 mode, ie higher than most people think. maybe a little more, depending on the balance of boost/revs used to get there. mine did within a hair of that on the factory short motor without issue. oem mains caps start cracking around the 1000rwhp mark. so at the point where you go into it for the rods you may as well also do L19 head studs, billet mains and pistons.

 

youre in the clear til pretty big power at that point. unless youve overcapitalised, by then youre running a t6 frame 80mm+ turbo spinning ~9k ballpark to properly use it and your next problem will be keeping the oil up to it under sustained high rpm. thats claimed a couple motors at the tx mile turning 92XX rpm through the traps in 5th, the solution being dry sump. but in the real world theres obviously limited opportunity for that sort of extreme sustained 5th/6th gear stuff, so most people will never get there.

 

below the gasket, good pistons/h-beam rods/billet mains caps will see you through just about anything. spend any spare cash on frequent oil changes and lightening other fast moving stuff like shimless buckets, they save a heap of weight. people often overlook maintenance on these cars in favour of the next modification, that can make for more hassle in the long run

 

Thakns for the input mate Next round of mods here we come