4BD1T, Maximum performance

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Originally Posted by Blknight.aus

4bd1t's are the go.

the back of the napkin suggests that you can haul over 1000nm a the flywheel and something in the order of 700hp from the engine... but thats a lot of money for not a lot of life.

the stock gear is good into the 200hp range and about 450-500nm but you need at least the 3 inch exhaust

For comfortable longevity I wouldn't recommend pushing it too much more than about 160 hp and 450nm.

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Not going to be a daily driver this one, so longevity is not an issue. My Rodeo is a daily so don’t want to push it much more by continuing to drag it. So the Landy is going to be the 1/4mile garden shed. Really looking at going into the upper end of performance out of it. From experience with the smaller 2.8, getting 1000nm 300+hp out of the 3.9 seems quite achievable with enough fueling (sort of what I need to achieve to make it worthwhile going to the 4bd1 over the 2.8 4jb1). From what I gather from some of the 4bTswaps forums a lot of the higher end setups have stock internal engines. What do you see as weak link, rods or crank? . The crank in the 4jb1 was always a weak link, significantly smaller than what the 4bd1 runs.
Cheers Paul

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Originally Posted by paulthepilot_5

Not going to be a daily driver this one, so longevity is not an issue. My Rodeo is a daily so don’t want to push it much more by continuing to drag it. So the Landy is going to be the 1/4mile garden shed. Really looking at going into the upper end of performance out of it. From experience with the smaller 2.8, getting 1000nm 300+hp out of the 3.9 seems quite achievable with enough fueling (sort of what I need to achieve to make it worthwhile going to the 4bd1 over the 2.8 4jb1). From what I gather from some of the 4bTswaps forums a lot of the higher end setups have stock internal engines. What do you see as weak link, rods or crank? . The crank in the 4jb1 was always a weak link, significantly smaller than what the 4bd1 runs.
Cheers Paul

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the real killer is going to be heat much over the 600nm and 200HP mark and you'll have trouble keeping it cool, it will then lunch the head gasket and pistons not sure what order it would happen in. assuming you only want short shots of full noise, legs and pins, then pistons and bearings.

the block may as well have been hewn from granite the heads gabbro, the biggest issues the guys who push them past 60PSi have is keeping the head bolted down due to head bolt stretch and failure.