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Joined: Mon Apr 14, 2008 8:22 am
Location: Whalley
Full Name: oliver heselton


Postby olzook » Mon Nov 09, 2009 8:14 am

I have been talking to a local land rover garage who have been experimenting with turbos.

They have been trying a version of a BMW engine and one of a Disco3. Both apparently spool up quickly and provide loads of boost low down in rev range. BMW one is apparently nearly bolt on where as the D3 needs a bit of fabrication of bracketry etc

Has anyone else tried any hybrid turbos or heard about these?

I presume that theyt would be OK to use as any over pressure will be dumped ??

Food for thought? :?

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Joined: Mon Jan 08, 2007 9:48 am
Location: wakefield
Full Name: Nick Clayton

Postby nicks90 » Mon Nov 09, 2009 10:53 am

turbo theory is a complicated and highly mathematical science.

Small turbos will spool up quicker and provide boost faster, but generally wont provide as much boost pressure and at higher revs they run out of juice or even suffer cavitation.
Big turbos can power a starship - eventually, once its got over the turbo lag of spooling up.
Variable vane turbos are a bit special. They angle the vanes in the compressor side to a high 'pitch' at low revs to give fast and high boost pressures immediately, and then taper the 'pitch' away as the revs rise to maintain a constant boost no matter what revs are used. Means a comparatively big turbo can give good instant boost at low revs and still maintain boost with no cavitation at high revs.
Setting these up is a nightmare to work out and finding the right one to match your engine outputs and capacity is an art form. Theres been a chap on LR4x4 forum who was experimenting on fitting one to his 300tdi. I think he has used a couple of dozen different springs and lever arms to try and get the variable part to work properly with the engine and then his engine blew up.
Not sure if he is trying again or not. Was a hugely complicated thread with lots of maths and flow dymanics etc.

If the turbos you mention are of the variable geometry type and do work (and pretty much bolt on) i would be extremely interested! Followed by a trip to the nearest bmw scrappy :lol:
Mines had a slight fuelling tweak and goes lovely once on boost, but if i could get the boost to come in a few hundred rpm lower it would be bloomin lovely.
Another bloody dent...

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