Do you regret choosing your power adder?

[robvas]

not on a centrifugal supercharger, on a turbo you'd be correct.

RPM controls the boost

You *can* put a wastegate after the centrifugal if you really want to overspin it and bleed off the excess in a futile effort to gain some lower rpm power

If you're (trying to) do anything with the bypass valve other than letting out air when you close the throttle, you're doing it wrong

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[Zrussian13]

RPM controls the boost

You *can* put a wastegate after the centrifugal if you really want to overspin it and bleed off the excess in a futile effort to gain some lower rpm power

If you're (trying to) do anything with the bypass valve other than letting out air when you close the throttle, you're doing it wrong

Thank you!

 

[Zrussian13]

not on a centrifugal supercharger, on a turbo you'd be correct.

They make wastegate kits for centri cars so you can do it the correct way too.

 

[Forestlump]

They make wastegate kits for centri cars so you can do it the correct way too.

That they do indeed but it's for a totally different purpose.

Maybe I should have called it the recirculation/ dump valve or BOV all the same thing.

You say tomatoes, I say tomatoes.

The waste gate on a turbo is to bypass the turbine, which is what they are designed for.

When used on the cold side of a centrif, (not what they are designed for) it's used to bleed off a bit of boost, like if you were running a bit too much psi in the upper rev range for the engine to stay together. It's done to add some torque to the lower rpm because you can run a smaller pulley or bigger crank pulley or a bigger blower ect.

You may see them advertised as torque boosters, they don't boost torque, the pulley change does, the wastegate is being used as a pressure relief valve, PRV.

 

[Forestlump]

RPM controls the boost

You *can* put a wastegate after the centrifugal if you really want to overspin it and bleed off the excess in a futile effort to gain some lower rpm power

If you're (trying to) do anything with the bypass valve other than letting out air when you close the throttle, you're doing it wrong

I'm giving up! I think you just like to argue for the sake of it.

 

[Forestlump]

Correct me if im wrong but Wastegates control boost. BOVs relieve the pressure in the intake/ piping during gear changes to prevent compressor surge.

The BOV is open all the time, not just at gear changes. All the time there's zero demand for boost, like when there is vacuum in the inlet manifold.

There's flow going through the supercharger all the time the engines running. The only time it builds boost is when the valve closes. Like when the throttle opens enough for the vacuum to decay enough for the spring pressure in the BOV (recirc or bypass) to close the valve. It won't make boost until that valve shuts (it works the same on a pd, it's just integral to the supercharger).

So, if you alter the spring tension, you alter the vacuum required to keep it open and the effect is getting the boost in quicker on a lighter throttle input.

Don't confuse increasing boost pressure at lower rpm for throttle position.

Ofcourse, if you go wot with any spring (within reason) there's a maximum psi depending on hardware but we've now diverted on to throttle sensitivity and boost. So that's how you can adjust it.

 

[robvas]

The BOV is open all the time, not just at gear changes. All the time there's zero demand for boost, like when there is vacuum in the inlet manifold.

So, if you alter the spring tension, you alter the vacuum required to keep it open and the effect is getting the boost in quicker on a lighter throttle

So you want to "get into boost quicker" when there is zero demand for boost.

 

[gsxr1300]

Can you not adjust the power to each gear with the whipple software anymore? I could with my 2015, i would remove 20% in first 2 gears.

 

[Forestlump]

So you want to "get into boost quicker" when there is zero demand for boost.

No that's what PDs are for

All the boost in the world at tickover! awesome, you can make 500hp and 18psi at 1500 revs at 10% throttle. That sounds wonderful!

https://www.slashgear.com/1502284/why-ford-mustangs-spin-out-frequently/

 

[Forestlump]

So you want to "get into boost quicker" when there is zero demand for boost.

That's what your setup would have been like that you said you had with no bov! Always trying to produce boost, if you wanted it or not. You'd end up plunging the compressor in to deep surge every time you let off the throttle and you'd break the impeller eventually, like this photo.

 

[Wolfys11]

I'm giving up! I think you just like to argue for the sake of it.

Ive been saying this, hes gone against every one of my comments, even when i argue for opposite sides he still stays on the other

 

[Wolfys11]

So you want to "get into boost quicker" when there is zero demand for boost.

We are talking about the boost at 10%, 20%, 50% throttle input will have the boost increased, which isnt necessarily going to do anything more than just act like a sport mode tune for throttle sensitivity tuning

 

[Forestlump]

RPM controls the boost

You *can* put a wastegate after the centrifugal if you really want to overspin it and bleed off the excess in a futile effort to gain some lower rpm power

If you're (trying to) do anything with the bypass valve other than letting out air when you close the throttle, you're doing it wrong

Here you are, straight from Tial. Feel free to take it up with them.

"The spring rate should be based on the customer’s preference for opening rate".

 

[Wolfys11]

Here you are, straight from Tial. Feel free to take it up with them.

"The spring rate should be based on the customer’s preference for opening rate".

“Tial doesnt have a engineering degree so this has no evidence” or something along those lines

 

[Forestlump]

“Tial doesnt have a engineering degree so this has no evidence” or something along those lines

Haha, you read my mind!
Anything you do, think or say is wrong!

I don't even know my job title anymore!

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