Is the juice worth the squeeze? I'm not sure at this point.
I had to grind a little on the back of the TB to get it to mount flush against the intake. Hooking up the vac lines and the fuel lines were pretty easy.
The car started right up but there is a god forsaken noise coming from the plenum. The large flat surface area on the top of the intake vibrates making a hollow / tinny noise. Rest your hand on it at it goes away instantly. Remove your hand and it's back.
It must flow a little more air as it thru off my SHFT trims by about 10%. It ildes good and after about 50 miles I can say it drives fine however the noise is killing me. My car is a true sleeper. No heads or loud exhaust and the twin turbos muffle the fact there are no cats on the car. I can hear the noise while at cruz or at idle and it bugs the hell out of me.
The solution would be to weld a 1/4" thick x 1" wide aluminum rib down the middle of the intake to braces the big piece of thin sheet metal then have the intake powered coated again.
At this point even if it made an extra 50hp I'm just not sure the juice would be worth the squeeze.
I've done nothing at this point but cruz over to Khalls house and take him for short spin to show him the FB 4R70W. We never got after it. I was just trying to burn off the E85 so I can put 93 back in it and finish storing it for the winter.
The intent of my posting in this tread was just to show folks what it would take to bolt it on. Nothing more nothing less. I hope this info helps those that are thinking about installing it.
I was told at the recent NMRA race that Holley will soon be releasing a bolt together version of this intake that will be much stronger than the current version so you can run big boost with it. The version out now was supposedly never intended for boost, only NA which is why several people have split them open while under boost. Bart Tobner has one of the new bolt together prototypes on his car now.
Here's a couple pics. 82mm with th400 and billet everything and Holley efi
So a manifold volume lower than stock volume would cause a lean condition if it is not accounted for in the tune. Is this because less volume translates to more flow?Let's say the manifold volume with the Holley was less than stock. This would mean that the computer would anticipate air later than what was actually happening, resulting in the injectors spraying later than they should. This in turn would require the ecu to compensate short terms with more fuel to counteract the unanticipated extra air (i.e. it would be lean for a little while in closed loop).
I can't really see where you get any advantage with this manifold over the FRPP, except that it looks a little cooler.