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Top feed conversion for early manifolds


Technikhaus

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Hey all,

 

So I'm wanting to go top feed on my RS, I have a Rev D Legacy manifold with pink top feed injectors and rails, but it's a off-set manifold, so I can't just use it.

I was told at one point you could buy the Carl Davey adapters to use those manifolds, but they no longer produce them.

 

So the other option I was considering was using my later model intake that I've got that does fit, but uses phase two side feed injectors, and making an adapter to fit the top feed rail onto it. 

The issue then is sealing the top feeds in the side feed housing.


Any suggestions on how to do this?

 

Anything would be much appreciated!

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@SAS does an adapter kit for top feed conversions on early models. 

 

Your information contradicts itself too, the phase 2 sidefeeds (as far as I know) only came in offset bolt pattern manifolds e.g 98 onwards, the v1-4 stuff is all inline bolt pattern and is all phase 1 injectors, and generally any subaru 98 onwards is offset manifold design for legacy/foz/wrx . I've head there is an NA fuel rail that houses the p2 injectors but will bolt to the early RS manifolds, I tried it but it wasn't fitting on my rs so I custom made something to work. 

 

 

To convert an early model legacy to top feed is quite a simple task but requires quite a lot of parts to do it. You will need

 

Top feed injector collars and rubber bushes to sit in the inline bolt manifold

Top feed adapter plates so you can bolt the fuel rail to the manifold

Top feed rails

Top feed injectors

Re-pin injector plugs or cut away parts of the plug to allow them to fit

Custom fuel lines /mixing and matching lines to get it to clear everything

 

I have photos of my rangi custom made setup if you want them, on photobucket atm but happy to upload them here 

 

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Hey bro, I went through this dilemma on mine. Ended up getting whoop as side feeds (1000cc from USA I can't remember) into phase 2 rails on top my v1 mani (yet to be tuned though) think they were 700 and arrived from overseas within a week (check my build thread can't remember where from) as it was too much of a mish going too feed. If you end up going toppies I bet loads of people would love someone knowledgable like yourself to do a write up ^_ ^ :P

 

 Will have some decapped blue side feeds to suit p2 rails spare soon (650 or 850cc can't remember but wasn't even close to maxing on my setup) 

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