72mm plenum

DaveEFI · Post by **DaveEFI** » Mon Sep 10, 2012 10:21 am

I've been given a 72mm plenum.

My engine is a standard 3.5 apart from Stage 1 heads , and uses a Megasquirt, so no AFM. What would be the pros and cons of using this - obviously with a larger air filter and trunking?

kiwicar · Post by **kiwicar** » Mon Sep 10, 2012 3:11 pm

Hi
in favour, if the standard throttle body causes a restriction at full throttle then it will reduce that restriction. Against, if however the standard throttle body is not the cause of any restriction at full throttle then it will make the throttle less precise in that it will be effectivly at full throttle before full travel of the pedel (full opening of the plate).
It is unlikley that the existing throttle plate causes any real restriction to your engine unless it has stage 3 heads, headers, radical cam. As you have the thing and want to fit it then do so, and live with a less precise throttle, but it would not have been a part I would have fitted to a mild tuned engine.
Best regards
Mike

DaveEFI · Post by **DaveEFI** » Mon Sep 10, 2012 3:30 pm

Thanks Mike - it's what I sort of guessed. Is it of any use to anyone here?

r2d2hp · Post by **r2d2hp** » Mon Sep 10, 2012 3:34 pm

Would it be of any benifit for my SuperCharged engine.

My Engine is 4.3 and when running std AFM and plenum it made approx 270 bhp so dont think there would be a restriction on a 3.5

regards
Reg

kokkolanpoika · Post by **kokkolanpoika** » Mon Sep 10, 2012 3:49 pm

I have got range/land rover hyprid 3.5litre stage1 hotwire with 72mm plenum.. It will run very sweet indeed.. no proplem at all..
STD cam, STD 9.35CR, tuned exhaust, slightly ported heads etc.. +210hp/311Nm..