Cams = Loss Of Power!

[croat]

Had my car dyno tuned yesterday. Made 220rwkw as the boost was spiking all over the place up in the high rev range. Look at the wastegate actuator and the bloody thing is moving in and out when it hits boost!

Now i have a HKS GTRS with all the supporting stuff! new manifold/fuel system/plenum etc.. i made 240rwkw before i had the cams/manifold/plenum installed. so why would there be a loss of power? i thought even on lower boost settings i would pull around 240rwkw and on big boost around 270 or so? has my motor become too efficient for the turbo with the cams and maxing it out as a result?

[R31Nismoid]

Boost controller is... ?

i mean if boost is spiking all over the place, thats the good place to start

[rev210]

did you dial the cams in at all?

Adjustments to camshaft timing is critical to make them work right. Just putting them in at 0 is silly

[RB20DET SILVIA]

good point are they dialed in?

[YRL05S]

Too much overlap allowing boost to blow out the exhaust ports?

[Col-GTSX]

Nismoid is right.... Start at the boost controler and get the level. Boost going all over the place will cut a heap of power off the top line....

[croat]

the boost controller is a blitz sbc-id. maybe something is wrong with the actuator? what is the HKS factory actuator spring setting set to?

[BHDave]

For internal? I've had them set at 10, 12 and 14psi depending on the amount of preload run.