is it neccasary

[supersport]

i was wondering if it is good and hp gain to get rid of the butterflies and have openings it was just a thought

 

[thecrew2999]

dont ask me im not 100% sure but from what i read before you will have a huge lose at low end, it would sound mean the whole way threw.
i guess the lose is so bad you can really feel a big difference when driving... give it a try in some spare time it olny takes me 15 mins now to take my whole intake apart.
good luck, im sure more will chime in

 

[1993MTXSHO]

BADDD not good, the yamaha engineers knew what they were doing when the built this engine. Short runners (the primaries) will give more tq and less hp, long runners (secondaries) will give less tq and more hp. So the short smaller runners will give you the low end tq and when the secondaries open up to allow all the air in it allows for more hp. So to make that easier to understand having the secondaries open all the time will make your car slower

 

[Zeegs]

I believe (not 100% sure) that if you switch the vacume hose's on the check valve like thing (not sure what it is called, but it is located on the back middle of the intake, should have two vacume hose's, one comming from the cylinder canister beside it, and one the runs up into the intake to open the secondary's), it leaves the secondary's open all the time. Although you probably will loose bottem end power (I do believe it sounds nice though!).

The idea of the duel stage intake is to keep the volicity of air up. When the engine is running at a low RPM, only the one set of intake runners are open so that the air volicity is keept high. When the RPM increases, there is a greater demand for air in a given time, and that is when the intake would become restrictive, so the secondary's open up to allow more air into the cylinder. If you were to leave the secondary's open all the time the volicity of air entering the combustion would be slower during low RPM, resulting in less air getting in. It's basicly the same idea as volicity stacking witch is more commonly done on V8's.

I am no expert, but that is what I understand

 

[SHOtime2511]

BADDD not good, the yamaha engineers knew what they were doing when the built this engine. Short runners (the primaries) will give more tq and less hp, long runners (secondaries) will give less tq and more hp. So the short smaller runners will give you the low end tq and when the secondaries open up to allow all the air in it allows for more hp. So to make that easier to understand having the secondaries open all the time will make your car slower

i think your backward,long runners are primaries and they generate the low end TQ
the short runners are secondaries,and generate the top end HP

 

[Zeegs]

Short runners (the primaries) will give more tq and less hp, long runners (secondaries) will give less tq and more hp.

HP, IIRC is calculated by multipling TQ by 5252, then dividing by RPM. So if you increase your TQ you will increase your HP at that RPM, or if you loose TQ you will loose HP at that RPM