Originally Posted by iceman
Are the internals forged in these engines?
Any guess as to what they will hold on a stock bottom end or where the weak points are that need to be built for near 800 rwhp?
Only the crank is forged. The pistons and rods are the weak point for Forced Induction or NX. But that being said, if one wants to upgrade pistons and rods to forged parts to handle increased boost or nx, then it is recommeded that the crank be replaced as well because there are much stronger forged units available.
For 800whp you will need:
Forged pistons, rods and crank. - since this has to be done, it makes since to increase engine size to 392 or 426ci.
Ported Heads with larger valves.
Head studs.
Upgraded cam and push rods
Ported intake manifold.
90mm Throttle Body.
Underdrive Pulley.
Upgraded fuel injectors and boost-a-pump.
Headers, highflow cats, and catback exhaust.
Cold Air Intake-CAI.
Diablo Sport Predator programmer.
All of the above is a very common package we create weekly for customers. It will make 500-520whp on pump gas and can be daily driven.
To make additional power, will require a power adder of some sort. Ie. Supercharger,Turbocharger, or NX.
At 9si boost -NON Intercooled-, pump gas, daily driver: Our 426 will make 630-660whp
Adding an intercooler: 10-30 more whp.
Increasing boost: I would expect that 13-17psi would be needed to surpass 800whp. Boost needed will depend on how efficient the supercharger/turbocharger is. - There are many variables to consider, and I cant write 3 pages on here. lol.
Just a reminder: We sell all of the above componets and can create your dream machine.
Tim C