Slight hesitation when coming on boost - R33 GTST

[Custard]

Slight hesitation when coming on boost - R33 GTST

Hi all. Since I've had my Skyline I've noticed that often when coming onto boost (from 1/2 throttle or more) from a reasonably low rpm (under 4k) there will be a slight delay in the power coming on.

It's a 1997 GTST, only engine mods are pod filter, front mount, yellow jacket coilpacks and MBC. Fresh BCPR7ES spark plugs gapped to 0.8mm. 

I'll watch the boost gauge and it will make 10 PSI (my set boost level) but won't really shove for another second or so. It kind of stumbles for a second before it remembers that boost should equal power. It doesn't splutter like with buggered coilpacks, it just kind of doesn't respond properly for a moment. It's not the delay from the boost itself that I'm feeling, there's definitely a delay between boost and power. That's not right, surely? 

The only thing I've really tried is replacing my fuel filter and cleaning the MAF with some electronics cleaner. I'm thinking either MAF or fuel pump. Any ideas?

Edited November 1, 2016 by Custard

[niZmO_Man]

Try doing the same tests at 7psi?

[Custard]

1 hour ago, niZmO_Man said:

Try doing the same tests at 7psi?

I was running standard boost not very long ago and the behaviour was the same.

[jap4lyf]

Are you running the stock BOV? my old r33 had the standard BOV and had similar issues.. must of been slightly leaking sometimes (was 20+ years old so did a good job) Replaced with a new aftermarked one and problem solved

[Custard]

On 11/12/2016 at 10:12 PM, jap4lyf said:

Are you running the stock BOV? my old r33 had the standard BOV and had similar issues.. must of been slightly leaking sometimes (was 20+ years old so did a good job) Replaced with a new aftermarked one and problem solved

I have blocked the BOV with a plate.