Dual-stage intake manifold - B18C

[VTEChnique]

Dual-stage intake manifold - B18C

I know you cant get the B16A or any type R intake manifolds to fit onto the B18C, but what is my most ecconomical way to ditch the dual-stage manifold as My B18C is running on B16A ECU so it wont activate the 2nd stage of the intake...

help !!

[DynoDave]

I can supply you with a replacement manifold for your engine PM me for more details.
Regards Dyno Dave

[tanghy]

skunk manifold
costs a bomb tho

[civicboy]

vtechnique so ur in d process of engine swap? b18c vtec?

[pornstar]

remove the runner and tune to compensate for the difference. otherwise, use an ecu that can control the butterfly.

[VTEChnique]

vtechnique so ur in d process of engine swap? b18c vtec?

yeah am getting all necessary bits sorted before car goes into workshop next month (march).. gotta get it in before VTEChnique Drag Day in April.

remove the runner and tune to compensate for the difference. otherwise, use an ecu that can control the butterfly.

that makes sense... Can I just do that ? Fields SFC / VTEC controller should be able to take up some of the slack for that huh ?

Tanghy - yeah that crossed my mind, but the Skunk2 is a bit pricey.. maybe down the track after cams..

[civicboy]

oh cools, gl man

[tanghy]

i told u already
wire the harness correctly and use a b18c2 ecu
less money and still keep runner

[VTEChnique]

i told u already
wire the harness correctly and use a b18c2 ecu
less money and still keep runner

yeah I AM doing that Tanghy - but the problem is - I think it's running on B16A ECU thus not opening the butterfly valve in the intake manifold.

I dont like the design of the dual-stage intake manifold and I want to replace it with something else..

Cant afford to do Wiring AND ECU...

[hondar]

i am just curious why you dont like the dual stage butterfly?

well, it depends on which power goal you are aiming at.

the butterfly or dual stage is good for low-mid range but is good at high as well. it has the best of both world. howver compared to itr manifold, it is not as good.

the itr manifold, it has a larger plenum with short and fatter runner and designed for high end gain with a bit of penalty at low and mid.

I think it is best to be honest to save some money and buy a b18c ecu. i dont they are that expensive compared to a type r or some rare ecu.

Wreckers or ebay should have plenty of this.

Btw, skunk im act like a type r

anyhow if you keen on want to know to how to calculate your ideal intake manifold that matches your goal, this is it.....

To quote:
David Vizard's Rule for IM Runner Length

The general rule is that you should begin with a runner length of 17.8 cm for a 10,000 rpm peak torque location, from the intake opening to the plenum chamber. You add 4.3 cm to the runner length for every 1000 rpm that you want the peak torque to occur before the 10,000 rpm.

So, for instance, if peak torque should occur at 4,000 rpm the total runner length should be 17.8 cm + (6 x 4.3 cm) = 43.6 cm.

Vizard also suggests that you can calculate the ideal runner diameter in inches by:

SQRT [ (target rpm for peak torque x Displacement x VE)/ 3330 ]

SQRT = square root

VE = Volumetric Efficiency in %

Displacement in Liters

So if we want peak torque at 5800 rpm at 95% VE in a teg,

SQRT [ (5800x 1.8 x 95)/3330]

= 17.26 in. is the ideal runner diameter. <end quote>

[eknine]

good info - you have my thumbs up -> hondar

[hondar]

thanks eknine