Originally Posted by
Chas
Which manifold are you referring to? Both the MFi and EFI are a centre fed manifold unless I am missing something
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Always an interesting topic.
Here is one for you? If you were running around 220-240BHP would you bother about what manifold you have or just leave it? So far, my ZVH has an MFI manifold and is making 230BHP & 18PSi. IIRC it's running a Piper 285T cam and a Stage 3 head believe to be of PE origin.
There would be gains to be had but they wouldn't add a vast amount of bhp because of the boost etc your running , a well designed manifold will give slight gains low boost but really come into its own at high boost pressures. The jenvey plenum which was originally design for the evo engine made 76 bhp just by adding it to the engine with a map to make sure the fuelling was correct no added boost etc. In the test in one of the ford mags they did a test on zetec turbo inlets running low boost 8 psi I think and the jenvey and area six inlet did very well. If you think £750 + for 20/30 bhp is value for money then go for it but try getting that much bhp anywhere else on a engine for less than a grand.
Plus it's not all about bhp like I said earlier I would much rather have my engine running 20 psi make 500 bhp than 30 psi make 500 bhp and it can also give you a lot better throttle response throughout the Rev range.
Gus i take it your just using the mounting plenum chamber and not the roller barrels mated with throttle bodies?
Cheers Paul