Question, why install the fuel pump? I have same setup with MY06 and I was told I didn't need a fuel pump. Jeff also tuned my car.

 

Why is the boost so low? On the Science of Speed web site it says the 3.6" pulley should be around 13psi on the NOVI 1200; which is about the boost I would expect for the power numbers you're getting. I've heard freeing up the exhaust could cause a slight decrease in boost, but 3 psi is a good bit. Was the belt slipping up top?

Fantastic nunbers by the way x

Coolberg - you don't need to upgrade the fuel pump with the standard pulley or the 4.2" pulley, but anything over it's a good idea; especially with ID1000s.

 

I've been told any changes to the exhaust side will not change boost. Other then valve tuning.

A 4.2" pulley only netted me 7-8 psi with full exhaust mods.


Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

 

I have the 3.6 and only got 10 psi. I have been struggling to find an answer for over a year as to where the 3 psi went. Only differences in my setup from OP is I have stock cat. My exhaust is 70mm Invidia Q300 and stock fuel pump. Jeff told me last year after my tune that I can add a smaller pulley easily and there would be no need to add a fuel pump.

 

I bought the larger fuel pump because I'm not done with the car yet...


I'm totally not sure why it was so low. Could me not gapping my spark plugs have anything to do with it?

 

Jeff gapped mine so I doubt it's that.