bov question??

[speedy_talon28]

I know you need a bov and boost gauge for turbocharged cars but, do you need them for supercharged cars???

 

[sureshot971]

I do not know much about supercharged cars so please correct me if I am wrong but I do not beleive so, Possibly a boost gauge but I dont get why you wouldnt know how many pounds since it is ran off of a pulley and the bigger the pully the more pounds.

It is belt driven not exhaust driven so I dont see the need of a bov either.

 

[Sharadon]

Yes they do.

except for positive displacement roots blowers. Any forced induction needs a way to vent boost when the throttle blades are closed.

 

[sureshot971]

I thought you only needed a bov with a twin screw supercharger that is intercooled

 

[speedy_talon28]

I do not know much about supercharged cars so please correct me if I am wrong but I do not beleive so, Possibly a boost gauge but I dont get why you wouldnt know how many pounds since it is ran off of a pulley and the bigger the pully the more pounds.

It is belt driven not exhaust driven so I dont see the need of a bov either.

instead of a bigger pulley it's a smaller pulley makes more pounds. I was told this

 

[Sharadon]

The twin screw type use a bypass valve that recirculates boosted air. Centrifical blowers are basically a belt driven turbo type blower.

Think of it this way. Where does all the air go when you shut the throttle blade at 6000 rpm. It has to be vented.

 

[Sharadon]

instead of a bigger pulley it's a smaller pulley makes more pounds. I was told this

Yes, small pulley, faster compressor speed= more boost.

 

[sureshot971]

Yea like I said I dont know much about them, thought I knew a little bit, but now i know that i didnt know much at all.

 

[speedy_talon28]

sureshot971 said: I don't know why you would need a boost gauge on asupercharger. If I get a pulley and don't how much boost it produces, I think it's a good idea to have a boost gauge

 

[speedy_talon28]

Yea like I said I dont know much about them, thought I knew a little bit, but now i know that i didnt know much at all.

I know that I don't know much about the either

 

[sureshot971]

you buy the pulleys based on how many pounds they make I think. I mean you probly want it but it probly isnt necassary. you want to hit 9 pounds you buy a 9 pound pulley

 

[speedy_talon28]

you buy the pulleys based on how many pounds they make I think. I mean you probly want it but it probly isnt necassary. you want to hit 9 pounds you buy a 9 pound pulley

ok, I thought a boost gauge was necassery just like turbos but, now I understand the difference. thanks for you and everyone's help

 

[sureshot971]

haha boost gauges arent necassary, mine just broke but luckily my boost controller is electronic with a digital display and it also says how much boost.

 

[Sharadon]

The blower manufacture can figure your airflow with your engine specs. Once you change things like cams and porting the head it changes things. Then add belt slippage into the mix and I'd like to have a guage to see for myself. How else are you going to tune it. Since compressor speed is directly related to pulley ratio and rpm the weather will also affect total boost produced. Cold air builds more boost then hot summer air.