4A-GE with 264º HKS Camshafts running very rich

[apardal]

Hi guys!

I've recently installed a AFR meter to try to understand how my 4A-GE is in terms of fuel efficiency.

My setup is the following.

- Stock bottom end
- HKS Camshafts 264º/264º
- Shaved head (0,5 mm)
- TRD head gasket (0,5 mm)
- Port & Polish (with 3 angle valve job)
- Bronze valve guide bosses
- Ignition Timing 10º BTDC
- Both camshafts at 110º BTDC and ATDC
- Stock fuel pressure regulator
- Stock injectors (200 cc's)

The AFR meter gave me the following readings:

1st attempt:

Idle at 1000 rpm - A/F 11,0
Light accel - A/F 12.8
WOT at 3rd and 4th gear 7800 rpm - A/F 11.4

2nd attempt (after correcting the CO to a leaner position while idling):

Idle at 1000 rpm - A/F 14.7
Light accel - A/F 13.5
WOT at 3rd and 4th gear 7800 rpm - A/F 11.5

I've also done a compression test which gave me the following values.

Cylinder / Compression (Kgcm2)

1 / 11.5
2 / 12.2
3 / 12.3
4 / 12.6


I have several options.

1st - try different injectors (maybe 182 cc's dark grey injectors)
2nd - try a fuel pressure regulator, lowering the pressure.
3rd - spend a lot of money in a piggy back system

Say what you think

Thank you