As per instructions, the 7psi springs are a great start with this kit. From there you can bring the boost up to a desired level with a boost controller. Usually around 10psi.
I would not start with a 4psi spring unless you want to run a max of 6psi with a boost controller.
I have said it many times, each tuner has his own "idea" of what a safe level is for each platform. On the VQ37vhr this will range from 400ft/tq at the wheel all the way to 480ft/tq at the wheels. TQ is always the indicator of how comfortable the tuner is, not so much the HP.
Another thing worth noting is that you can have two identical cars, identical turbo kits, fuel, boost pressure...ect. Same dyno's but different tuners. Each graph will be different though, because timing will play a huge role in what your tq/hp look like. The dyno graph is almost like the signature of your tuner, not so much the kit.
Last edited by Boosted Performance; 01-28-2014 at 03:10 PM.
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