Disadvantages of really lean AFR for cruising

[Peace]

I'm driving WOT most of time in a city 50% or more its WOT and break. Thats why i got high fuel consumption.
As an experiment i drived easy for a week and got around 16l per 100 km in city. Not faster then 60 km/h, slow acceleration.

[Legionnaire]

IMO 16L/100kms is still a lot for "easy" driving. I've got no more than 13.5 when driving within speed limits in city, ~15.5 when giving her some WOT here and there, and this is with my ultra-short gearing (4.36 final drive). Something is wrong with fuel efficiency on your engine, man. Check usual stuff.

[Peace]

Heh
I cant believe 2.5 Turbo 10+ y.o can do 13 in a city=)
most of the time you stay in traffic and move. Easy is anyway depends on a man. When i had celica 3S-GE it was consuming 15-17 per 100 when i was driving =) When my father took it for month he had 9 per 100 =) I don like low revs nomatter how hard i push the gas. Mostly its 1st and second gera
I have noting left to replace anyway =)
Now i just need to build my fuel and timing map right. It is wierd with z32 ECU there is somekind of ofset in timing because it refuses to work on stock timing with Z32 ECU and work perfectly with stock ECU. on Z32 ECU i get 40 Deg advance to sop car from detonate =) I know this is crazy, but this is how it is =)

[Dark Diver]

I also have the ECUtalk display, and it reports about 9.5 litres per 100km while using the cruise control on a flat road at 100km/h.

When I bought my bone stock '91 300ZX a long time ago, I went back to home by the motorway at 110km/h (it was rainning) and fuel consumption was also 9.5l/100km.

BTW, hi Dider, I'll call you soon about E85

[RomChip200]

This we, I managed to reach 12.77L/100 of E85 @130kmh, on my Audi S4, with huge timing advance.
For ref., I never went below 13.2L/100 on the 300.
Usually the S4 consumes more than my 300zx (my 300 runs lean when cruising, the S4 runs stochio).
From point to point, pure highway, cruise control.

[TM_S13]

for the moment I run 14~15 afr while cruising on the motorway and such, and I get quite a good fuel consumption. in a mixed style, motorway, city and giving it the beans here and there, I get arround 10L / 100km. quite pleased.

[Vetal]

Guys what timing do you run at lean cruise, and HOW did you get to that timing? On my CA18 I can vary it in a wide range and nothing changes noticeably

[RomChip200]

on E85, you may hit 60 degrees btdc , 2000-3000rpm, TP 5-20, w/o any trouble
for normal unleaded, >50 deg btdc should'nt be a pb

[Vetal]

on E85, you may hit 60 degrees btdc , 2000-3000rpm, TP 5-20, w/o any trouble
for normal unleaded, >50 deg btdc should'nt be a pb

50 advance on gas, 60 on E85, really?
How do you tune cruise/light load timing?

[RomChip200]

I just increased original maps from 300zx
It's 43 deg btdc oem when cruising