R32 GTR hesitation during throttle change

[Stixbnr32]

Hello,

My R32 GTR has a small hesitation when changing throttle position when cruising at 100km/h.

Its always had a small one but now its gotten worse.

Full throttle is fine.

background.

1) No MAF's

2) Splitfire coil packs

3) Nismo plugs (good check few months ago)

4) Compression 180-190 across all 6

5) Changed coil harness as the old one was brittle and fell apart but it didnt fix the issue

6) Stock ignitor (thinking its this)

7)HKS F-Con V pro had a touch up tune start of the year

8 ) vaccuum seems fine

9) Alternator is at about 13.8V

10) fuel filter has just been changed

11) Tomei FPR

12) -5 twin turbos

 

Any ideas?

Thanks

Edited April 30, 2019 by Stixbnr32

[GTSBoy]

It'll be in the tune, not the igniter.  Throttle transitions are sometimes tricky to tune nicely, especially with ITBs and no AFM.

[Stixbnr32]

Ah true - why would it have got worse though?

I have a link G4+ in my safe just waiting to get my new trigger kit so once thats in it might fix it.

[GTSBoy]

9 minutes ago, Stixbnr32 said:

why would it have got worse though?

Fuel pressure could have changed, injector(s) could be a little dirtier, small vacuum/exhaust leak changing the way it breathes, etc etc. Probably all sorts of sneaky reasons.  Even just changing the fuel filter might have done it.

[Stixbnr32]

Yeh thats interesting as I did change a couple of old fuel hoses as they were not in very good condition.

Ok retune sooner rather than later.

[Lithium]

Do you have a wideband on it or anything?  That FCon must be harder and harder to find people to tune, are you likely to stay with it?

[Stixbnr32]

no wideband.  Yeah the HKS is going - that is why I have a Link G4+ in the safe waiting to go in. 

Just waiting for my trigger kit.