Hey got a much bigger IC and someone said i would get less boost. Which is does not seem to be the case, but i do see a lot more lag.



Normal?

 

just out of curiosity what IC did you get?

 

They were probably referring to pressure drop.

 

you should not see a drop in boost over all. yes there will be increase in lag. The larger IC takes longer to fill and get to presure.

 

In fact you can mathematically approximate the lag time:

From Maximum Boost by Corky Bell



"A reasonable judgement of the volume's relationship to lag can be made by dividing the internal volume by the flow rate through the system at the RPM at which the throttle is appled and multiplying by 2. (The factor fo 2 results from the approximate doubling of airflow through the system when going from cruise to boost.) The approximate lag time is gien by



Time = (V/Flow rate) x2"



For his example he uses an intake volume of 500 in^3 and a flow rate of 150 cfm, which after the unit conversions and math comes out to .23 seconds.

 

I have the Vmount IC from Rotary Extreme.

 

Ok, I also noticed that my full boost doesnt happen until 5500 - 6000 RPMs, but though that should be around 4500. BTW i generate serious pull at the max boost.