Range Rover 3.9V8 EFI (hotwire)

[TwoSheds]

Since the old girl is now running on Megajolt (although not on the road yet) I thought it was about time I posted the odd pic here...

[TwoSheds]

And here she is four years ago before I started ripping her apart.

Jobs done so far:
I have welded the front, the drivers side, the rear and the chassis.
I have replaced the ignition, plugs, leads, fuel tank, fuel pipes and the upper tailgate.
I have removed the rear seats and relocated the LPG tank to just behind the front seats, replacing and relocating the filler and pipework while I was at it.

Still to do:
Weld the passenger side and the rear floor, service/replace the brakes as required and fit electric fans.

Nearly there!

[TwoSheds]

Done!

[NITROPIXIE]

How different is it using megajolt over the stock dizzy???

[TwoSheds]

How different is it using megajolt over the stock dizzy???

Ooh wow - where to start?

OLD DIZZY:
poor starting on petrol
spluttering until warm
would not start on LPG at all
kept stalling on LPG
strobed timing bouncing around a 15deg range with lots of missing flashes

Overall I was so confident that the engine was knackered that I bought a replacement (which is still sitting on it's cradle in the garage)

NOW ON MEGAJOLT (same engine, new plugs and leads are the only other changes):
Brilliant starting on petrol or LPG, hot or cold
Smoo-oo-ooth tickover on petrol or LPG, hot or cold
Pulls clean and strong from less than tickover to (self-imposed) soft rev limit (5500rmp bins all set to 10deg) on petrol or LPG, hot or cold
Strobed timing nob-on 10deg (limp-home)

All of the above with a totally basic (not at all optimised) map.

To say I am delighted would be an understatement.

I would say to anyone with a Rover V8: - "Put Megajolt on it and you will be GOB-SMACKED by the improvement"

HTH, Roger

[NITROPIXIE]

That's great, are you planning on getting it properly tuned or are you going to play with it yourself a bit first.

Make sure you get the action phot put into the site banner, looks mint!!!!

[TwoSheds]

Make sure you get the action phot put into the site banner, looks mint!!!!

Thanks! (Although I think it looks a bit of a mess! )

site banner??? Wossadden?

Roger

[brentp]

Referring to this!
http://www.autosportlabs.org/viewtopic.php?t=2469

Can we use your action shot?

[NITROPIXIE]

(Although I think it looks a bit of a mess! )

Its a Range Rover, its supposed to look a bit of a mess, unless you like doing school runs in it, lol

[TwoSheds]

Referring to this!
http://www.autosportlabs.org/viewtopic.php?t=2469

Can we use your action shot?

I would be honoured!

Do I need to copy it to that /\ thread?

[NITROPIXIE]

Yep stick it in there and Brent should notify you when its up on the banner. Or keep an eye out for it yourself.

[Quagmire]

Very nice! Can't wait to get my Defender running with it!

What HT leads did you use- did you make your own/ modify LR ones/ or buy ready-made leads from Fastlane etc?

Asking as leads are the next thing on my hitlist

[TwoSheds]

Very nice! Can't wait to get my Defender running with it!

What HT leads did you use- did you make your own/ modify LR ones/ or buy ready-made leads from Fastlane etc?

Asking as leads are the next thing on my hitlist

I can't recommend http://www.fastlaneauto.co.uk/ enough they are brilliant!

I measured using existing HT lead to get the correct bends and path and then called up with my measurements - the salesman was very helpful and answered all my questions and the leads turned up 48hrs later, all perfect lengths!
I did this after spending many evenings in the garage picking apart and trying to rebuild Ford leads - you can do it, but Fastlane are FAR better and are reasonably priced too

[TwoSheds]

Mystery misfire poses problematic symptoms - solution satisfactoily simple: Proper plug-ins prevent piss poor performance...

I got a mystery misfire after hundreds of miles of great running. It occurred at all times but got MUCH worse (not drivable) when on petrol and giving it some berries, when it would splutter and not pull at all. Gas on a wide throttle was reasonable (still misfiring but drivable).

Since the misfire was worse on petrol than gas (which is unusual) - after checking and gaps/condition of all plugs and HT and LT wires etc I concluded that MegaJolt was fine and that it must be fuel.

Next step - check all temp sensors, fuel pipes/pump/flow/pressure/return, injector wires, ECU connections, fuel pump and injector relays. All fine.

BUGGER!

Then - sitting in the cab listening to the misfire, scratching my ass trying to think (I find it helps), I noticed that the plug on the 'four diodes and a zenner' flyback circuit was not quite home (it sits on the dash) and so I absent-mindedly pushed it in. INSTANT smooth runnings.

So - why was it worse on petrol than gas? Only thing I can think of is that the 14CUX ECU was detecting the misfire and going into limp-home or something and refusing to give full volumes of fuel... Anyone know if it does this? (there are no lambdas on mine so it's not 'seeing' the unburnt fuel at all...)

Still confused but happy it's fixed

[NITROPIXIE]

I'd say that sounds about right. If you have no engine speed input to the ecu then it doesn't know how much fuel is required so chances are it would of gone into limp home mode, maybe just using a tps as an input for fuel delivery, otherwise it wouldn't of worked at all without the engine speed input.

I'm not certain on this but sounds like a good hypothesis.