Lean Cruise ... I did search, but ...

[superls1]

I was unclear of whether or not it required a Custom OS or the code was simply enabled for all 2001+ calibrations. I tried a couple of mods today, but did not record/notice any differences.

Enable = 55
Disable = 50
Modified the factor table (tried different values in the "cruise" cells).

Does it work in both OL and CL? If it does work in CL, does it simply override + LTFT's or does it actually command a different AFR? What kind of factor are you using to achieve say 15.5:1. I tried various vaules, but with my WB did not notice any difference.

[Dirk Diggler]

Lean cruis does not work on US vehicles and isnt enabled in any Custom OS. The only vehicles that have LC enabled are the Holdens

[superls1]

Thanks. In this thread, http://www.efilive.com/forum/viewtopic.php?t=1271, Ross made it sound like a soon to be released version would allow access on US vehicles. That was in February. I thought some people were claiming to have enabled it on US cars.

[GMPX]

SuperLS1, you are correct, I did say we would bypass the Lean Cruise ban on US vehicles, but, we decided not to.
You can use it on the GTO, that is probably where you have seen people saying they are running it.

Here's the problem. We have discussed this before and kinda got blasted for it, but GM put a specific check in the Lean Cruise routine to check the car is a Holden (or GTO), bypassing this is just a two line code change, but we just didn't know what legal problems this may cause US in the future and didn't want to spend thousands on a lawyer finding out.
Our new O.S's which you guys should be able to download next week will allow you to run Lean Cruise, but not using the Lean Cruise routines so therefore we never bypassed GM's platform check.

Cheers,
Ross

[joecar]

Why did GM disable lean cruise on US models...?

[SinisterSS]

Lean cruise produces higher levels of NOx; so from an emissions standpoint, LC is illegal in the USA.

[GMPX]

FYI, Holden have had it calibrated out for about a year now too.

Cheers,
Ross

[87gmc]

so are we going to have to worry about cats? and also will it be safe to use on lets say a 400 mile trip

[mistermike]

...will allow you to run Lean Cruise, but not using the Lean Cruise routines so therefore we never bypassed GM's platform check.

Cheers,
Ross

Musta been a lawyer in a former life.
So aparently the GTO, due to its Aussie roots is (purely hypothetically) capable of LC. What target AFR should I not be using when I don't have LC enabled? Or maybe it wouldn't be such a hot idea with my upcoming mods. :roll: I've noticed when I've commanded a leaner than stoich AFR in the control panel, the NBO2's collapse to the low side, but it's sure nice to see that inst. MPG climb. Will this set a code after a time?

[Tydriver]

Has anyone ever determined what the MPG savings are by running Lean Cruise ??

Is it worth messing around with ?? From what I understand it only works when certain enabling factors are in place (namely cruise control enabled, steady state MPH etc. hence the name) So I cant see it beneficial for around town driving but I have been known to take a road trip or two and would be definitely interested in seeing what MPG gains are typical by enabling it...