[MacMustang]

Is there such a thing as a boost controller for a supercharger? I understand that turbos have that option, but have never heard of one for a supercharger. I assume that due to mechanics it would need to be a centifugal and not a roots. Any info on it would be helpful, thanks.

Plan is to move from NA to force induction one day and just want to start planning it out now, nothing like bench racing

[coolwaterblvd]

It is called a smaller pulley pretty much to increase boost. But a supercharger is only as efficient as the amount of air it can push through it. That is why u see much bigger superchargers that stay around the same boost levels as the smaller chargers but they flow much more air for the same amount of boost than u can get with a stock charger or basic one. Like the kenny bell superchargers for the 03-04 cobras they stay around the same boost but are much different because the kenny bell flows much more air efficiently.

[MacMustang]

Thanks for the reply coolwaterblvd, I get the deal with swapping pullies...Is there anything like what is used on turbos...ie "electronic boost controllers." Or are pullies the only way to really control the boost of a charger?

[coolwaterblvd]

Not that I am aware of that is the only drawback of the charger is that it is Rpm based power where turbos are demand units u can be running 5000rpm with a supercharger with the wheels off of the ground and pull full boost but a turbo will not because it works on exhaust velocity and vehicle load that is why they make more torque than chargers and are more fuel efficient because they are on demand powerplants.

[BlueStreak03]

Since a supercharger is mechanically linked to the crankshaft through the pulley and belt, then the pulley size and gear ratio of the blower drive gears are what controls the boost relative to the engine speed, nothing more, nothing less. If you want more boost, get a smaller pulley. If you're overboosted, get a larger pulley. There are no electronic devices that control boost levels in a supercharged application.

[Kyle F]

Actually, a lot of Blowers have a bypass valve that acts like a waste gate and releases extra pressure... some don't have it.

Efficiency doesn't have to do with the amount of air moved... both Blowers have to use the same CFM of air to produce the same amount of boots. The Efficiency has to do with the work absorbed from the engine that is made into boost, and not into heat. The KB can make more boost, with less heat than the stock blower on the Cobra.

[MacMustang]

Originally Posted by BlueStreak03

There are no electronic devices that control boost levels in a supercharged application.

Thanks that answered my question, alot of my friends have turbo cars that they can control the amount of boost from inside the cabin with in seconds. I was just curious if that could be done with a charger. According to what all of you are saying that is not a possibility. Thanks for the replies, appreciate it.

[Kyle F]

I could be done, but a Turbo Charger is much easier to control.