Td5 out, 3.5 V8 in.....

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Chalky.

Chalky.

Well-Known Member
Posts
5,126
Location
Mid Wales
Not asking whether or not people think I SHOULD do this, more if anyone knows the small details of HOW. I will/have accumulated various bits and bobs over the years and for me however people rave about the td5, its not the same as an old school V8, simple and easy to work on, and always makes me smile.
 
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Do you know in and outs of cats / emissions regs for your model year? Not saying I do but I'd be interested to know if you could pass an mot
 
The fueling answer would be fit a lower pressure/flow pump , as ideally you need a flow and return system to prevent vapour locking . You state that the V8 doesnt need much in the way of wiring , which is correct , so the great majority of your TD5 loom could be ignored or removed. You will need to change your guages to work with the V8 as its highly likely that the Td5 ones wont work .
The previous poster has a point re emissions standards , and possible need for cat depending on age of your TD5 I have only fitted more modern engines in my landrovers so they have always been to a higher emissions standard than the age of vehicle required , you would appear to be going other way .
 
tacr2man said:
The fueling answer would be fit a lower pressure/flow pump , as ideally you need a flow and return system to prevent vapour locking . You state that the V8 doesnt need much in the way of wiring , which is correct , so the great majority of your TD5 loom could be ignored or removed. You will need to change your guages to work with the V8 as its highly likely that the Td5 ones wont work .
The previous poster has a point re emissions standards , and possible need for cat depending on age of your TD5 I have only fitted more modern engines in my landrovers so they have always been to a higher emissions standard than the age of vehicle required , you would appear to be going other way .
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As regards to wiring, I wonder if stripping out the whole lot and getting an older dash pod with (as you say v8/tdi gauges) would be easier than splicing into existing loom, will have to research this particular area son more
 
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I don't think emissions work on the age of the car,,only on the age of the engine.
pre 1984 engines[you would have to check] are I think exempt from emission testing, only visual inspection is required.
 
Interesting thread. I considered this a while ago by the end of my research but found the Td5 could have oodles more power for not a reasonable price. That said I would still like to do something like this in the future, just with a bigger V8 :D

You keeping the R380 box? May be worth getting the HD bearins and the higher ratio 5th gear if you do, adds some longevity and a little drivability.
 
bankz5152 said:
Interesting thread. I considered this a while ago by the end of my research but found the Td5 could have oodles more power for not a reasonable price. That said I would still like to do something like this in the future, just with a bigger V8 :D

You keeping the R380 box? May be worth getting the HD bearins and the higher ratio 5th gear if you do, adds some longevity and a little drivability.
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Yeah keeping the r380 with diesel ratios, was thinking of getting a 1:2 trans or a roamerdrive (still not sure which way to go, but when I send her in to Ashcroft's ill get them to change the mainshaft etc and get the hd bearings as it seem ls like a sensible
 
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(bloody fat fingers posted too soon)
..... Option for a small outlay, and I will be getting the higher 5th too! Cheers for the interest! :)
 
Looks interesting! I've got the higher 5th on my TD5 90 its great, sits at 70 asthough its 60 which is really nice on the Mway.

There was a little thread up a couple days ago I started about changing to the 1.2 box after what I read I felt keeping the 1.4 box + the higher 5th was a better option, though just my opinion.
 
bankz5152 said:
Looks interesting! I've got the higher 5th on my TD5 90 its great, sits at 70 asthough its 60 which is really nice on the Mway.

There was a little thread up a couple days ago I started about changing to the 1.2 box after what I read I felt keeping the 1.4 box + the higher 5th was a better option, though just my opinion.
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Thanks mate, Id read that thread, infact I've been stalking yours and Browns convos on all that malarkey!! ;)
 
Now this will be an interesting one to watch. A lot of the TD5s instruments and gauges are driven by the ECU, so the engine could be wired to work fine but the rest of the car's electronics wouldn't be much use. The fuel pump wouldn't be very happy working on petrol because it derives a lot of its lubrication from the diesel itself. You'd probably be better off taking it out and making a blanking plug for the tank and getting yourself a separate electric fuel pump like an SU or a Facet or similar. The TD5 instrument cluster can be made to work for a 300tdi (so could possibly work for the V8 too) as demonstrated in a blog post by Retroanaconda, but the rest of the wiring loom will need a lot of work in order to bypass the ECU. Might be easier just to source the relevant V8 looms.
 
Hi Brown, thanks for your input! I had no idea about the lube for the pump, and had presumed id be able to keep the existing one and regulate the pressure, however with your info i may have to do as you say and replace (i had an electric fuel pump on my rrc, cant remember what make), but its a good idea. I still have the loom from the rangie in the rangie shell, all wrapped up in plastic and labeled, so i think id fit that ignoring the td5 loom, then see what extras i needed to run gauges etc, it may prove easier to keep some aspects of the loom and ditch others, although im guessing in the dark here and you may well be right in ditching the whole lot....will only set about physically doing this when either the box has to come out, or the engine for whatever reason.
 
Gottschalk said:
Thanks for that mate, I hadn't thought about vapour locking tbh, I guess it wouldn't be to hard a task to fit. As regards to wiring, I wonder if stripping out the whole lot and getting an older dash pod with (as you say v8 gauges) would be easier than splicing into existing loom, will have to research this particular area son more
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Just get reliable aftermarket gauges [ideally mechanical = no wiring] least of your problems! Excellent project - go for it..........................
 
The TD5 fuel pump is weird, in that it pumps fuel round the fuel filter under the rear offside wing, back into the fuel pump and then off to the engine at 60psi, then back to the fuel pump via the filter, which is why the filter and the tank itself get hot after the engine's been running for a while. That's why it's probably easier to just use a pump that's designed to maintain a carburettor-friendly pressure of petrol. You might want to hang onto the bit that forms the sender for the fuel gauge though as that's a handy little ballcock arrangement with contacts that sweep round a quadrant as the float rises and falls. Anyway, rigging up a fuel supply is probably a minor bit of tidying up compared to the main course of engineering you've got in front of you.

If your TD5 is anything like mine you've got the 'red plug' loom that mostly (though not entirely) covers the engine functions and the 'black plug' loom that does a lot of the other things. As the ECU won't be getting any vital signs from the engine I'd be tempted to use as much of the Range Rover loom as possible.
 
mickyh said:
pre 1984 engines[you would have to check] are I think exempt from emission testing, only visual inspection is required.
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No expert but I think you'll find that's pre '75
Silly question I know, but why not flog yours & buy a factory V8 :rolleyes:
 
Because I've done a lot of work to mine, rebuilt axles, galvy chassis etc etc, I'm testing the water really, so how much work will have to go into it first
 
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