power for pushing 40s

[swynx]

I've seen people run 40s on a 4 cylinder and I've seen it on v8s.

What's the general consensus of how much is enough for 40s?

I wheel with a few guys running 40s on 5.3/6.0, 5.38 gears, and there all shooting for 550+

 

[bobbywalter]

40's....?? to cruise with or just wheel.?.?




i run 42,s and 44,s with @110 whp v8 n/a diesel and 410 gears.


and i can still break dana 60 shit with that ridiculous combination. but it has ok torque available from 1400-to 3600 so it is tolerable....just slower then smoke off shit...



but it sucks being rpm limited with the diesel off road...cruising it does pretty good....i just dont use od till i get on flat hiway at higher speed....70 ish...



gearing is the equalizer....to an extent. terrain goals determine the power level needed.

i miss being able to go to 6-7000 rpm off road. it makes things much easier to navigate.

 

[Blown]

With tires that size can we assume trail rides and rock crawling? If so you don't need all the power, you need low gearing and a doubler is nice.

If your ricky rally racer then the tires are too big and you'd want more power from a V8 or blown 4.0 IMHO.

If you are daily driving it and out to trails some compromises may be necessary.

 

[Sasquatch_Ryda]

4.0l with 5.38's on 40's. Seems fine.

 

[Grunizzle]

Just trail riding a stock engine and low gears is fine. If you're into the bouncing thing 400+.