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Isuzu’s in Land Rovers generally got their ‘noisy’ reputation from when they were in the Stage 1 (about 1982), they were very noisy, especially on start up when they often had severe vibration and rattled the crap out of everything.
But, later engines are a lot quieter, for example, my 4bd1T (1990) is quieter than the 300Tdi I had in a 130.
Guessing it's the 1.003 transfercase that's the main contributor to the low rpm.Quote:
Originally Posted by noddy
Standard, 235/85r16. It's an early Range Rover 1.003:1 transfer case so yes, the gears are tall. The 4BD1 is happiest below 2500rpm, so it suits well.Quote:
Originally Posted by noddy
Pretty sure they just modify an LT85 to Isuzu bellhousingQuote:
Originally Posted by Vern
Yeah Brian they do. From memory they cut the back out if it and weld in the new bolt pattern.
My experience has been the same as Rijidij's. I have a 1999 Defender (ex Tdi) with a late factory turbo 4BD1T and Suffix J R380. The conversion was done nearly 12 years ago. The vehicle has covered over 330000 ks with the Isuzu fitted, the present gearbox has done about 280000 ks since rebuild with no issues at all. The vehicle is used extensively in very remote parts of the country, has made multiple crossings of the Simpson, is used for towing, and is often loaded to GVM on long trips.Quote:
Originally Posted by rijidij
Gearing with a 1.2:1 transfer case is very well matched to the engine. Bell housing was put together by British Offroad - they still have the jig - LT85 bell housing with the back of a Tdi bell housing welded in place. I my opinion better set up than the other alternative mentions in an earlier post.
The pundits have long said R380 wouldn't last behind the 4BD1T: they have been proved wrong.
FWIW
Do you think that its the turbo that cuts down the noise ? I have a normal aspirated 4bd1 that the noise is driving me insane on right now.Quote:
Originally Posted by rijidij
Quote:
Originally Posted by Zcoota
Adding a turbo to my NA did make it a bit smoother & quieter. Not a remarkable improvement but it was noticeable. Doing the Nissan Patrol fan clutch conversion also helped, especially at highway speeds (though make sure you use plenty of Loctite plus split washers on the studs and nuts if you do this - my hub came loose with ...ah... entertaining results!).
Of course, I'm sure you'd get better results spending the turbo money on sound suppression materials but where's the fun in that?!? [biggrin]
A turbo will quieten the exhaust a bit, but probably won’t have much affect on all the mechanical noise.Quote:
Originally Posted by Zcoota
Have a look at the plastic covers on the bulkhead in the engine bay. Most of the time they are warped and the rubber grommets (for the speedo cable and some gauge wiring) either not sealing or missing completely. Any hole here and the noise from the engine bay is piped straight into the cab. Same goes for the oval rubber seals either side of the fuse box.Quote:
Originally Posted by Zcoota