RR 4.6 Gems v8 into a Chimaera

[Graham]

On the look out for a motor for my Chim and I fancy the idea of the gems ecu, with a bit of fettling from mark Adams to remove the coding and a decent target map it should be able to self tune any mods.


Has anyone fitted a Gems motor into a chimaera or a griff, the main stubling blocks i can think of are possible issues getting the original tvr pas pump to line up, ( no ac) although I suppose a saxo electric pump could be a way around that if a real issue.

IIRC the range rover sump is a bit different does that fit?

The biggest tuning issue i can think of is cam choice IIRC the cams are different due to having a cam sensor, does anyone know whats available for a gems motor..


The basic idea is find a running 4.6, strip it, replace all bearings, shells and rings etc, pressure test block, stick a set of decent heads on, find a decent cam, tweeked ecu and bolt it all together..

any thoughts

G

[v8 racing]

basically everything you have said there is easy, the pas pump on a tiv is the same as a range rover, just the bracket that is different, the cam can be changed no problems apart from you wont be able to run a double roller chain, so dont go too mad on cam choice or you will be breaking cam chains, sump everything else will fit

[vjj]

Graham

If your engine is knackered just buy another TVR-spec engine - there are loads out there on ebay - if your hotwire is giving trouble just replace it - again, loads out there - if you want more low-end grunt for drifting/sprinting just change the cam and get the hotwire re-mapped for torque(Austec, Mark Adams et al).

I have a TVR lump running hotwire in my defender - changed the cam to a stump-puller and had the tornado mapped for low-end grunt. Incredible from tickover to 3000 rpm! Had to fit a 3-speed Torque-flite auto to handle the grunt - you should be ok with your BW T5, though.

Or you could buy a megasquirt system - heard good reports from the guys on the landrover forums.

There is a guy local to me whose chimaera caught fire from a trickle charger- he had let his insurance lapse as the car was SORNed so he is up s**t creek - he would probably sell you his engine(4.5, 28000 miles, full history) for a reasonable price.

Edited by vjj on Wednesday 18th July 07:46

[900T-R]

GEMS makes a lot of sense for serpentine engines though - after de-coding (so it can be used outside of a RR) and setting target AFRs it essentially tunes itself, eliminating all the 'that time of the month' like driveability quirks associated with ageing CUX14 systems without opening a whole new can of worms by installing a generic aftermarket system.

All OEM parts (including all brackets, connectors etc) with OEM reliability (you will need a V8 Defender loom to be able to install the ECU out of the engine bay. Also Euro 3 compliant should it ever become an issue...

TVR did build a couple of Chims with GEMS, unfortunately they could not strike a deal with LR...