Cruise Mixtures

[Bass Junky]

hey ppls.

All you tuners out there, what AFM ratio are you running at cruise?

I think mine is about 13.2 : 1

I get crap economy could this be why?

I have stock turbo, 260 poncams.

PFC

[paulr33]

do you know if you've had the top 10x10 cells tuned for economy? my fuel economy is povo and sam is redoing it this weekend. http://members.dodo.com.au/paul/pics/paulr...e-lightload.jpg im getting those area's tuned for max fuel economy. mines a tad over 12:1 probably same as yours. i assume your o2 is working ok

[Bass Junky]

Yeah, new O2 about 12 months ago

[paulr33]

what economy do you get? im averaging 320ks to a full tank. ill let you know how my retune goes. im dying for some better economy

[Bass Junky]

About 290 - 300,

320 if I do lots of 20 klm + drives

[Sydneykid]

hey ppls.

All you tuners out there, what AFM ratio are you running at cruise?

I think mine is about 13.2 : 1

I get crap economy  could this be why?

I have stock turbo, 260 poncams.

PFC

<{POST_SNAPBACK}>

The Stagea runs 14.7 to 1 at closed loop cruise and idle. The R32GTST race car also defaults to 14.7 to 1, but it doesn't do much closed loop running or cruising.

It's been a while since I looked, but I can't remembr seeing anywhere in the Power FC mapping where you can change the closed loop aim from 14.7 (even with a Datalogit). So if yours is really at 13.2, then it's most likely not running in closed loop and the mapping changes will have some effect. But if it is running 13.2 in closed loop, then the mapping changes will have zero effect.

cheers

[JaFF]

I'm in the same situtation with my r33gtst. about 320kms per tank.

Yesterday I filled up with 95RON (best we can get in tas at the pump) and it cost me $1.31.9 per litre. getting pretty costly to run this thing and it's my daily too

[Bass Junky]

How do I check or turn on/off the closed loop control with the hand controller?

[R31Nismoid]

i came off 460km's to my tank with room for more last week

admittadly im on the stock ECU at present but that means im staying off boost, and never going above 3000rpm... boost is the enemy of fuel economy

i should have tried that while i was using the PFC etc. Best i got then was 330 but that was with a stuffed O2 sensor and lots of boosting

[Busky2k]

To check for closed loop, go to the etc menu and then "Function Select". See if the O2 F/B is on or off. Go here to see what enabled/disabled looks like;

http://www.clubrx.org/media/pfc/PowerFC_FD3S.pdf

Page 39 in acrobat.

[Bass Junky]

K

Now I've heard a horrible story about leaned out cruise mixtures can burn out exhaust valves on engines with big cams.

Not sure whether I'd call my 260 Poncams big or not, or whether I'd call 14.7 that lean.

Any thoughts?

[BOOSTD]

I have a book here by Julian Eager who states 16:1 is ok for cruise........?

[BOOSTD]

I have a book here by Julian Eager who states 16:1 is ok for cruise........?

[Bass Junky]

With or Without Cams?

[3R1K]

Hey Bass,

Just wondering you guys are getting 320-350 km out of full tank but how big is your full tank?

I got 350 km per 45l , and I thougth skylines got 55-65 litre tanks

Erik

[Bass Junky]

That's from a pretty consistant 50 litres.

I fill right on the red light, and there's almost always 50 litres going in.

[3R1K]

My yellow light normally lights up quite early about 40l used then I just fill it up on the E , I will fill around 45-47l max haha.

I thought I was doing bad with those 350km (I'm a student so not much highway driving) , since BP Ult petrol price went up to 126 cents per litre!!! ridiculous (In Perth)

[3R1K]

Oh yeah I forgot to add my a/f ratio is around 14 for low rev if my memory serves me right

[satanic]

Finally a post for the 34 economy!

I'm getting about 350kms out of a full tank as well - bloody crazy!!! If anyone has any tips or tricks at all, please pass on to little grass hopper here

[rob82]

Is Julian Edgar quoting 16:1 for a nissan? Is that cruise or lean cruise? Most cheap (non sequential) aftermarket computers wont cope with those kind of numbers. We continue to run lean cruise in most holden v8's with durations up to about 220deg at 50 thou as a rule of thumb. But this is only with sequential ECU's.