would this affect the life of the engine even if i could do it in my LL8 I-6??
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would this affect the life of the engine even if i could do it in my LL8 I-6??
its not bad for the engine. Only problem is if it pings...
I'll have to try to figure out how to enable that. I am getting tons of requests for ecomony tunes. Guess I better read up on custom OS...
Well since the LL8s have never been able to do lean cruise like the Holden rides or 04 GTO, I dont know how you'd do it. As Highlander said, shouldnt have any effect unless it pings.
Yes and No.
If you live in an emissions state they will nail you for the NoX emissions.
It can be a problem if you don't have it set up well.
I have tried running the engine at 17:1 for short periods of time. Basically what I have heard is as long as the load is low you will be ok.
Been running lean cruise for a couple of years now. Just get ready for it to burn the cats up:beer:
Not a problem here. No reason at all!
I was under the impression,
lean-cruise raises cylinder head temps and thus raises ECT?
My initial thought is that I wouldn't worry about it damaging the engine. Most of the conditions where lean cruise is enabled are very low load anyway. Severe damage occurs at high RPM / load.
And I thought a rich mixture would cause hotter operating temps, or is that only on the rotary engine?
On cars with reasonable camshafts you generally can't use it because the lean mixture causes misfiring. The jury is still out on the real world savings lean cruise actually makes, don't think it's going to turn a 6.0L in to a Honda Civic!
Cheers,
Ross
Lean condition raises the burn temperature, so yes, anything will heat up more. Anyway, as someone else stated, under low load, this usually isn't a real problem. The only thing to watch out for is the cats, if you still have some ... IIRC, cat protection will add additional fuel when it kicks in to lower exhaust temperatures ...
Well, I sincerely hope not! :doh2::grin: J/KQuote:
lean cruise actually makes, don't think it's going to turn a 6.0L in to a Honda Civic!
I don't aggree that leaning the mixture ( from stoich ) will increase temp. If we are running lean at cruise than the load is clearly low, so if we go lean we are going lean from 14.7. Therefore less fuel than optimum, giving less temp.
This is not a guess, pilots regularly run 75% throttle at cruise and 50 degrees Celcius colder than stoich, for best safe economy.
On the other hand, if we start at 12.5 or so at full load and start to lean off temps will certainly increase, toward 14.7.
Does anyone have an EGT gauge and the ability to run lean cruise? There would be some interesting data to be gathered.
I think that PLX will be getting an order for Fathers' day:hihi:
Cheers, Steve
Thanks for the interesting info, vzs. Care to explain why you think that occurs? By the way I love the sig! :)
I have a log with Tech Edge WB installed and a pyro. This is all at highway speed. Load increases temp, but lean cruise doesen't let me know what you think.
Your log is exactly what I have been looking for. I have mapped your EGT vs Throttle Position, filtering out transient throttle, low throttle, cold ECT and cell counts less that 10. It shows that as AFR leans off EGT drops. Not sharply, just a big, wide, fat curve.
My take is that 14.7:1 represents exactly the correct proportions of reactants (obviously), and so gives the hottest flame, if we vary from stoich then the flame cools and burns more slowly.
This means that a rich or lean mixture needs more timing, sort of explains B5908 (Fuel mixture spark correction) and its use for lean cruise.
More timing should compensate for the slower burn and lower temps even more.
The OEMs can't use this approach because a lean mixture gives good economy, controls CO and CH but fails NOx badly.
BTW your drive home from work is about 100Kph faster than mine:doh2:
Cheers, Steve
I'm glad you found it useful. :) I have had the EGT prob installed for quite some time, just have never really put it to good use.
Oh, and that was my drive home from the track this Sunday. My truck ran a best of 12.21@110.5mph, not bad for a 5300# pig at 4800' elv. (DA was 7000') :lol: And our interstate speed limits here are 75mph ;)
All this talk of lean cruise reminds me. I was sent an Email a month or so back stating that on a Torrent download site there was some cax files posted that allowed lean cruise on all GenIII's from 2001+, US vehicles included.
If someone can find them please let us know what it's all about. I've had no luck in my searches.
Cheers,
Ross
Hmmm , does it really work ? : http://thepiratebay.org/torrent/4303...ll_ls1_engines
Tried DLing , nothing .
Thanks for the link, from what I see yes that would do the trick. If you dig back far enough on our forum (or it was LS1Tech), there was some guys that figured out what needed to be done.
Cheers,
Ross
If someone can get it to download , would they post the file ?
I have tried several times and will not download .
Thanks
I got it to DL, but not quite sure what to do with it... Does it just go in the EFILive calibration folder, or in the tune it's self?? And will it only work on the Camaros and Vettes, or should it work on the trucks too?
EDIT: It won't let me attach it's cuz it a TORRET file and I have not converted it... I can email it.Quote:
Cax extentions for EFILive tuning software to allow you to activate lean cruise on US based camaros/corvettes.
Just dump these files into your calibrations folder in the lsb folder. Look for the new tables to show up and then do a full flash of the file after making the change, then all tables will be used.
Be warned. THESE ARE FOR TESTING ONLY. Do not damage my air.
Does this work?
I think all you have there is the TORRENT start script , used to start the TORRENT file download , the file is 23.3kb in size , that file is 375b .
Still when I try to download it stalls or says "stalled" and just sits there , tried 2 different Torrent programs .
someone please upload this to rapidshare.
I got it to download but it doesn't work.. files are CAX Format.
See if this link works:
http://rapidshare.com/files/13939633...uise_Patch.zip
Ok, now what do I do with the .cax files...?
There is a readme file inside the zip, it says.
Extract this zip in to :\Program Files\EFILive\V7.5\Calibrations
When you next load a tune file you will see a option at the bottom of the engine segment, look for parameter B9000.
I never found B9000 but there is a new entry at the bottom of the engine segment, exactly as stated, called 'bad things inside'. This contains an option enable/disable lean cruise. It also states that all the maps and parameters also need to be set up as per the Holden calibrations and then you you do a full flash. Then if it works.:cucumber:
All the Holden info is available at Holdencrazy.
Good luck, Steve
Try this :)
EDIT:
Sorry guys, we can't have these patches on our forum, try the torrent sites or pass them around via PM or Email.
Has anyone tried this to see if it actually works? I want to, but my truck is COS3 and I broke the steering on my dads truck, so I haven't had a chance.
Thought you were gong to try it first . :gossip:
I run a COS3 as well , since you said it would not work with it I didn't try . :badidea:
Haha, I would if I could find a test vehicle around here I could put my WB in to verify it, but for whatever reason, the B9000 enable button doesn't appear in the COS's :( or I would test it on my truck since I have a permanit WB installed on it and the other tables are there.
The Lean cruise routines won't work on a custom OS because the custom OS's run in open loop mode, Lean cruise is only activated once the PCM is in closed loop.
The whole idea behind the AFR table in the custom OS was to be able to create a pseudo Lean Cruise mode anyway.
Cheers,
Ross
Rich mixtures cause incomplete combustion, the residual unburnt fuel helps keep things cool and "safe," though obviously not good for economy and emissions.
Factory tunes for example run some PE tables in the mid 11:1 ratios for cooling purposes (cat protection, exhaust valve).
A lot of the Holden tunes (holdencrazy.com) have factory validated lean cruise parameters in them. If you want to play safe, download a few of the Holden Commodore tunes and copy the same parameters.
Though a read of this might be helpful.
http://www.americanaviationinc.com/effectsCessnas.html
I've seen quite a few engines with piston damage due to weak mixtures and considering no HSV or Corvette tune uses lean cruise, it's for a good reason and they (GM) have an awful lot more money to experiment with this kind of thing than I do. Though having no lean cruise is clearly for performance applications.
As mentioned in the above link, a couple of extra gallons of fuel used is cheaper than a new engine.
Whereas for daily drivers that aren't tuned for all out performance and enjoy cooler climates than the desert regions, the parameters in the Holden tunes mentioned would be a help.
p.s. Unsure why ppl say there's no closed-loop operation in the Custom OS tunes?
OS3 (SD) here with CL operation.
You do realize that , Ross is a owner of EFILive and programmer for it ? COS3 has a "Semi Closed Loop" mode which if values are set to stoich it will use O2 sensors for fueling , but you still have full control over AFR mapping .
When in COS3 , I understand that the some tables have been moved to another part of the EPROM memory , does the Algorithm still look for those tables and if not found , look for alternate tables , ones that were added ?