Boost gauge questions

[sdstriper]

I drilled a hole in the throttle bracket and put my boost gauge in the manifold above that area, removed a pipe plug and put the fitting in. I see some turbos with a gauge tap right on them. Would boost pressure readings be different closer to the turbo or on the outlet flange compared to at the intake manifold etc?

 

[tugboatphil]

I would think that as long as the IC has no leaks, the pressure would be the same on either end... . but have never heard this discussed. I used the plug on the manifold for mine.

 

[Greenleaf]

Different. Yes sir.

 

[sdstriper]

Different. Yes sir.

Scott, how much do you think?



And Thanks, Ross

 

[Greenleaf]

Don't know..... 2 or 3 psi I believe it is. It's refered to as a pressure differential in case you were wondering... ... ... ... ... ... ... ... ... .

 

[sdstriper]

Learned something again today, Thanks.

 

[rlyons]

You want your boost readings at the manifold, that way you can tell if you get a leak between the turbo and the manifold. After all what matters is the pressure at the manifold.

 

[JLEONARD]

After all what matters is the pressure at the manifold

Yes this is correct.

Scott is also correct about the pressure drop... at least in an IC engine.

Not so sure about in a non IC engine since the crossover tube is so short and straight.

Heat will also affect the pressure... again more reason for the "drop" with an intercooler.

 

[tugboatphil]

And Thanks, Ross

Who's Ross??

 

[sdstriper]

Who's Ross??

Hehe, Ross Marcotte aka www.sdstriper.com



Sorry for the confusion.

 

[PToombs]

Good lookin' work! Been there, done that!

 

[sdstriper]

Thanks Pete