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Off idle torque will be massively in favour of the Isuzu and most everyone on here that runs a 4BD1T has the fuel and boost turned up a lot higher than stock and the engine will take it and ask for more and still go 1,000,000km between rebuildsQuote:
Originally Posted by Hokoman
BTW, post # 107 explains why English tuning shops veer away from 3" pipes, it's more a theoretical thing.
That's for a stock 4BD1T. Here is the upgrade list for increasing the 4BD1T's torque.Quote:
Originally Posted by Hokoman
Stage 1.
Turn the fuel screw to hit 750C in worst case.
Cost. Nothing.
Torque around 380Nm.
Stage 2.
Modify the wastegate actuator to increase boost to 20psi (cut, thread, install sleeve nut and locknuts).
Cost. Minor.
Torque around 420Nm.
Stage 3.
Fit intercooler with 20psi boost
Cost. From $400 in parts on up.
Torque around 510Nm.
Now these figures are all based around a very conservative clean and safe air/fuel ratio. If you want to run hotter you can and get significantly more torque.
I was getting over 500Nm with just 20psi boost and no intercooler. But it was a hot tune that required an eye be kept on the EGT gauge.
To go past the figures above you need to upgrade the turbo. There are various options around the $1000 mark and plenty both cheaper and dearer.
Your 4BD1T stats are factory figures off wikipedia. I wrote those.:D
There is a guy in the US who had compound turbochargers, a massive intercooler and a custom fuel pump on his then unopened 4BD1T. The stock head-gasket let go somewhere over 60psi boost. They are a very strong engine and will produce far more power and torque than your driveline can handle as long as you can feed them enough boost.
They are quite different engines. The 2.8 being the end of a long evolution of small engines, the 3.9 being a heavy duty truck engine made to last 500,000km between rebuilds.
From the mouth of a horse, no, damn dyslexia, from the horse's mouth ... :)Quote:
Originally Posted by Dougal
I think that last line explains it in a nutshell to a novice. Thx.
Rick, thx yr post, I'll check it out.
I have to admit, the Isuzu route is very attractive. But it does seem that they're not that easy now to get hold of. Would that be right ?
They are very easy to get hold of 2nd hand, and a full rebuild kit is available (pistons, liners, etc, etc, etc).Quote:
Originally Posted by Hokoman
If you want a new engine then the 4BG1T (Marine/industrial) version is still available new AFAIK. 4.3L ! Though you may need to swap some parts with a 4BD1.
Btw - my 4BD1T has 1 and 2 from Dougal's list done to it. Plus a slightly larger than stock turbo - which should shift the torque peak higher if anything...
One aspect that hasn't been mentioned yet is that the Isuzu 4BD1T is about 150kg heavier (dry) than the HS2.8.
This may (or may not) be an issue with some people.
[edit]
On Wikipedia it's claimed that the 3.0 litre Power Stroke engine is based on the 300Tdi/HS2.8 block ?
[ame="http://en.wikipedia.org/wiki/Land_Rover_engines"]Land Rover engines - Wikipedia, the free encyclopedia[/ame]Quote:
and a further update of the 300Tdi design was launched as the 3.0 Power Stroke. Although based around the same block and basic architecture as the 300Tdi the Power Stroke has major differences such as electronic common rail injection and new crossflow cylinder head with Overhead camshaft.
http://www.nav-international.com.br/...eries/43_1.jpg
Rick, any idea how they get the 3.0 from the 2.8? I hadnt heard of them.....
Mate, I don't know if it's possible on the original bore centres ?
The 3.0 has a 96mm bore, the 2.8 is 93mm and the Tdi 90.5mm or something like that
hmmm.........I thought the 2.8 was a all new block with revised gallaries etc...as we know its not just a stroked 2.5tdi
Yes, but the bore centres are the same. ie. the distance from the centre of one bore to the next is identical from the Tdi to 2.8.Quote:
Originally Posted by uninformed
They most likely got the Tdi core plugs and mold,increased them 20% or so and got a 3.0ltre engine with no R&D cost.A ''new'' engine for little outlay,manufacturers have been doing it for years. Pat