You going to make and sell any more of your plenum? I'll buy a plenum if you do
How much psi bro with 512whp?Just thought I would share my personal vr4 build and dyno results along with the previous build as shown in the pics above both engines still on a stock head and block just fitted with arp head studs .....
Correct, this setup was build purely for 1/4 mile racing, so everything was done to keep peak TQ over 5000rpm.. This car ran a 11.25 secs on the quarter mile. 6000rpm launch control @ 15 psi boost of the lineIts the high boost threshold thats keeping these stock bottom ends alive. 300ftlb doesnt hit till 5krpm
If the turbo came on earlier youd be making more cylinder pressure (torque) at lower rpm where it has more time to transmit force to the rods and bearings. and that ultimately is what kills rods, bearings and stretches head bolts.
The higher in the rpm range you move the cylinder pressure the less time that force has to wreak havoc on the components. Until you obviously reach a certain RPM limit where Valvetrain stability or conrod tensile strength becomes an issue.
Case in point the single turbo car i completed recently makes 300ftlb (400NM) at 3800rpm and I wouldnt risk that on stock rods. It could make more power even earlier too if we were to run it on ethanol based fuels instead of the pump 95ron it was tuned on. But this is a street car running on street fuel. It only makes 460hp on 21psi but light to light i can guarantee that this car will be faster than the car that makes 80hp more (540).
On a drag strip itll be a different story and a Circuit race situation will be different again. but it all comes down to how the car will be used. And how much lag the driver is willing to put up with. Depends if your racing dyno sheets or racing cars