So I have a Whipple on a 6.0 with a cam. I have the smallest pulley available and am only getting 8lbs boost(weird huh?). I don't get it and it kinda bugs me. I also put on a SMC methanol injection kit to get intake temps down because I was having horrible problems trying to get timing up there due to all the heat. I have done 460rwhp cold, but with it all warmed up I'm doing 415rwhp range and the guy that does my tuning says when warm I'm only pulling 6lbs of boost and its way heat soaked. I don't like having to run the methanol kit and I would like to intercool. I know that if I cut the outlet off the charger and have it tilted up and run an LS style low pro intake I can get tubing up over the intake and get to an intercooler. I am just wondering if I will see more boost loss with all that tubing. Plus I know some intercoolers take some boost away, but will I not lose so much boost due to having less of a heat problem. Also any idea why I am missing so much boost, with that pulley I should be pulling 11lbs atleast.
Doing some research I found this..........
With twin-screw and roots-type superchargers the throttle body is on the inlet side of the supercharger itself. All the air in the supercharger housing and the tubing into the intake manifold are all part of the intake volume. When the throttle body snaps closed the engine must consume all the air in all that plumbing until it reaches idle vacuum. The more volume of air there is there the farther off MAF data will be from MAP data the PCM is getting and you'll get lean conditions when the throttle closes. Also, when the throttle opens there is an inrush of air past the mass-airflow sensor and the throttle body. This happens faster than that air fills the intercooler and the intake manifold and can result in a rich condition when the throttle first opens. It is for these reasons that keeping intercooler volume and plumbing to a minimum with a Whipple is important.
Since air-to-water intercoolers are more efficient and smaller than air-to-air, and because they can be installed closer to the supercharger requiring less plumbing, that's what's best to use.



So, with that being said would it be possible to put the TB back on the intake and put the elbow(modified) on the supercharger? Damn, sell the whipple????

 

SD tune problem solved

 

Sorry along with the intercooler & SD.you will about be needing one anyway after the intercooler and tune.

 

You can't move the throttle body on a twin-screw (or roots) supercharger to the discharge side. Flow control for these superchargers is by inlet restriction. With a wide open inlet they will pump an amount of air equal to their displacement with every revolution. They are pumps, not fans. Centrifugals can be restricted on the outlet side because the move variable amounts of air depending on outlet pressure.
Your setup would benefit from an intercooler because it would allow you to increase timing and gain power even if it means losing another pound of boost. You might consider using the Edelbrock intake that the turbo guys use. Run the supercharger outlet into the intercooler and from there to the center of the intake. Weld a bung into the plumbing after the intercooler for the IAT sensor. This would work well and not have the cylinder 7 and 8 lean condition.

 

And what exactly are you talking about there?

 

Speed density a lot of people go to this aftr about 500 rwhp.
Tte maf can not keep up so it is deleted.
I am not a tunning wiz but I believe the fueling is changed to specific tables instead of actual air intering the engine.
Somone else can elaborate more im sure.

 

I see, makes sense. Now as far as the edelbrock intake, can a person use the carb'd intake with the nitrous ports and put injectors in there and run it that way? And what are the chances that those ports are the same distance apart so a person can run a stock fuel rail?

 

MAF can't read above a certain pressure and above that pressure the computer is just fueling the same amount that it was where the table maxed out. It works, but it is just a guess. 2-bar SD reads up to 15 psi, and you have full control of the fueling in vacuum, and from 0" vacuum (naturally aspirated WOT), to 15 psi.
What power you gain from an I/C will be way more than the 1 psi loss gives.
Get a manifold made for efi.

 

What does your blower pulley measure? I think Whipple tells everybody that they have the smallest one made, whatever one you have, because they are Whipple.

 

I believe its 3.5" . I think I asked for a 3 or 3.25 and they said 3.5 is as small as they have for it.