Reasons For Late Boost?

[rcheli]

Went into CRD to get a baseline the other week.

n1 turbos coming onto full boost (initially at 1.3 bar but settle back to 1.1)

by ~5000 rpm.. I was expecting to see full boost by ~3800rpm?

Everything otherwise seems normal. No strange noises, reasonable AFR.

The car is pretty stock: n1 block and bits, n1 turbos, upgraded intake, proper exhaust,

mild cam, etc..

What might not be working to delay boost ramp like this?

I'll be putting in a pfc and HKS EVC and repost the dyno .. maybe that will fix it,

maybe not..

[R33GTRKid]

you have no PFC or boost control

[doo doo]

Your wastegates might not be seated properly- adjust to put more tension in the actuator rod- if this is too loose you'll get delayed boost response. If you don't want to pay a workshop to check this and you're not sure how to yourself I'll give you a hand, i'm in coorparoo.

Edited November 21, 2008 by doo doo

[rcheli]

you have no PFC or boost control

well, true, but a stock motor has boost control A stock setup should boost by 4000 rpm..

thanks doo doo, the shop is gonna get back to me after the EVC goes in. If they are stumped

I'll ask them to check out the actuators.

[PM-R33]

EBC with gain control.

[R31Nismoid]

just fix the actuators, dont neccesarily need a EBC at all.

I dont use one, nor do most of the bigger HP GTR's floating around down here.

All done via the actuator, its cheaper too (read: free)