BHP limit 4wd exhaust manifold
#1
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BHP limit 4wd exhaust manifold
Thinking of swapping to a 4wd one for a bit earlier boost, anyone done this, good bad thoughts ideas welcome.
thanks
tabetha
thanks
tabetha
#7
*** Sierra RS Custard ***
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And far more to boost building than that, an unequal length setup can result in short durations of higher pressure within the turbine housing as two pulses hit at the same time which can be useful for spooling a turbo (although typically will be counter productive higher up the rev range) especially if tuned to happen just at the point before the turbo would spool anyway.
Id hope that when ford designed the manifold for the 4wd they took this into account.
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#8
MAD Carbon Cossie
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I had 425hp & 425lb ft on my old Harvey engine on a 4wd manifold no probs & had seen 432hp with it !
I'd go with Lloyd on the prediction of hp figures & when the manifold becomes restrictive. It is slightly less laggy than the 2wd item & the hair line crack shouldn't matter too much, they all do & it's inside, not all the way through !
Good luck
jb
p.s. I prefer the sound of Cossie's wit a 4wd manifold !
I'd go with Lloyd on the prediction of hp figures & when the manifold becomes restrictive. It is slightly less laggy than the 2wd item & the hair line crack shouldn't matter too much, they all do & it's inside, not all the way through !
Good luck
jb
p.s. I prefer the sound of Cossie's wit a 4wd manifold !
#9
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They have a much more compact design and offer less lag, as I drive a lot low down around 1500/2000 rpom this would suit me better.
I've never seen a problem with cracked ones actually breaking, or leaking to any degree that matters, so this is not a concern.
tabetha
I've never seen a problem with cracked ones actually breaking, or leaking to any degree that matters, so this is not a concern.
tabetha
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