Rs turbo re shell into mk3.5

Problem or technical question?

Rs turbo re shell into mk3.5

Postby brownfiesta on Thu May 08, 2014 9:07 am

Well, my rs is dead, too much welding needed and too many previously bodged repairs have put an end to her unfortunately,
However I am going to re shell her, iv picked up a nice clean mk3.5 1.1,
All I have is a couple of questions,

Interior wiring loom, do I need to rip it all put and fit the rs wiring instead?
Front suspension, anti roll bar ect, is the anti roll bar stronger on the rs than on a lower model? If so do I change the whole front subframe over or bolt the rs bar to the standard 3.5, then the lower arms, can I bolt my rs stuff into the 3.5 subframe?
Fuel tank, swap it out for the rs item?

Many thanks in advance
Luke
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Re: Rs turbo re shell into mk3.5

Postby mikeymikeyp on Thu May 08, 2014 9:34 am

change everything bud as well as the metal fuel pipes under the car
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Re: Rs turbo re shell into mk3.5

Postby brownfiesta on Thu May 08, 2014 10:36 am

Ok thanks mate, cheers
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Re: Rs turbo re shell into mk3.5

Postby russ-RST on Thu May 08, 2014 12:47 pm

You don't need to change everything at all! Swap the plug over that connects engine loom to interior loom, wiring sorted.

If your 1.1 is injection all youl want is the pump out of the rs and your better of upgrading it tbh .
As per suspension wise don't swap anything over, FRST anti roll bar fits the mk3.5 fine and the mk3.5 suspension was changed as an upgrade so youl be better keeping it.
Iv reshelled a RST into my 1.3 injection mk3.5 and its a piece of piss pm me if you want any other help
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Re: Rs turbo re shell into mk3.5

Postby Smo on Thu May 08, 2014 7:07 pm

I'd swap the whole tank... My MK3.5 tank was different to my MK3 tank, and the MK3 sender wouldn't function correctly in the MK3.5 swirl pot due to its position.

If your 3.5 is the same as mine, there's no nuts for two of the four bolts that hold the S brace in the lower arm carriers, but I guess it depends if it's a sport model or not? You don't say! If it's not, then swap everything over; lower arm carriers, lower arms, hub carriers, shocks (front and rear), drive shafts, etc. Or if you fancy upgrading the suspension, keep the 3.5 stuff, but you may or may not want the lower arm carriers to bolt your S brace to.

I'd swap the whole loom, although I've just modified mine to work with my engine loom (Zetec), but that's because my old loom wasn't in great condition and I was short on time. Personally, I'd have preferred to use a good MK3 loom and ditch the PATS immobiliser (and obviously fit a decent alarm).
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Re: Rs turbo re shell into mk3.5

Postby russ-RST on Thu May 08, 2014 9:08 pm

Smo :I'd swap the whole tank... My MK3.5 tank was different to my MK3 tank, and the MK3 sender wouldn't function correctly in the MK3.5 swirl pot due to its position.

I must have a special mk3.5 then as everybody sais things don't work between the two but iv never had a problem, my RST engine ran perfectly on the standard tank pump and everything

If your 3.5 is the same as mine, there's no nuts for two of the four bolts that hold the S brace in the lower arm carriers, but I guess it depends if it's a sport model or not? You don't say! If it's not, then swap everything over; lower arm carriers, lower arms, hub carriers, shocks (front and rear), drive shafts, etc. Or if you fancy upgrading the suspension, keep the 3.5 stuff, but you may or may not want the lower arm carriers to bolt your S brace to.

Easy put a washer and nut on the 2 bolts for the S brace done.. I don't see the point in swapping over the entire suspension set up for no real reason and not to mention the mk3 driveshaft are weaker and the shocks are thinner, mk3.5 uprated parts are the same money

I'd swap the whole loom, although I've just modified mine to work with my engine loom (Zetec), but that's because my old loom wasn't in great condition and I was short on time. Personally, I'd have preferred to use a good MK3 loom and ditch the PATS immobiliser (and obviously fit a decent alarm).


Why ? Genuine question? The standard immobiliser works just fine with it and its a lot less work to change the 1 plug


I'm not being picky or putting people down I just really don't see why people turn this easy conversion into a whole car re shell to put on parts that do the same job or even inferior

ARB bolts on if you want to cut a thread into the carrier or just use a bolt n nut (nylock)
S brace same just put a nut on 2 of the fixings
Wiring swap the 1 plug over and a heck of alot less work and keep the immobiliser
My 1.3 pump ran the RST engine faultlessly not that I recommend keeping it but all that would need changing is the pump itself not the entire unit
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Re: Rs turbo re shell into mk3.5

Postby Smo on Fri May 09, 2014 12:21 am

If you're going to drop the tanks to change the pump, you might as well swap the complete tanks unless one is far better condition than the other.

You certainly can just put some nuts each side of the lower arm carrier, but if you're choosing to swap everything over because you're keeping existing shocks/springs, etc, then I'd swap the carriers for the sake of having it simple and not having to awkwardly hold a but each time you want to remove or fit the S brace - I like things to be as hassle-free as possible in the long run! :lol: ARB, yes, I agree, but that wasn't my reasoning for swapping the carriers.

Loom; like I say, that's a personal thing. I have one key at the moment, and I hate the thought of losing it! If he's carrying over the FRST interior and functions, it's possible that he doesn't have all the options, so it depends on how much he has and how interchangeable the parts are, electric pack loom, etc. Remember, your one was a high spec MK3.5, Russ. Does your oil pressure light work? I think the MK3.5 loom needs rerouting for that. Where does the coolant temp sensor wire (for the gauge) come from on the FRST? The engine loom or the car loom? If it's the engine loom, then the car loom will need modifying if the MK3.5 loom has it in the car loom and not to the engine/car loom connector.

As I said, it's personal choice, but if I was reshelling an FRST into a potentially basic MK3.5, that's how I'd do it, retaining as much of the FRST as I could. My loom had nothing, and still doesn't! But I needed the car done quick to get it on track and my old loom wasn't in great condition, otherwise I'd have swapped it - not that I want the electrics, but I would have liked a rear wiper! :lol:
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