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Old 24-08-2014, 19:28   #1
GUM EVO
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lean spool enable or disable

When running bigger turbos and high power setups who prefers lean spool and who prefers to disable it. In your experiences what are the advantages or disadvantages of both on stock ecu.

Really want replies based on big turbos and high hp setups rather than small turbo 500 or less hp setups.

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Old 24-08-2014, 19:29   #2
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I'm thinking the stock settings are probably useless once bigger turbos are used and by disabling it you can hit desired values more accurately through high octane fuel map. Also do people change the start and stop values for it when they have it enabled for big turbos??? I have some thoughts on it but wonder what others do and think regarding this.
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Old 24-08-2014, 20:46   #3
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ive not dabbled with mappin for yonks, isnt lean spool not actually lean spool but a time based enricher? so its good to have? for a top speed run or continued stick the mix richens adding cooling?
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Old 24-08-2014, 21:31   #4
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I believe the lean spool is just want it says... achieves a leaner mixture according to what the map parameters are set at. So the hotter exhaust gas will aid spool time... or at least my interpretation of it is as above... so realistically with a bigger turbo that spools much later you'd assume the lean spool thresholds would need modifying somewhat.
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Old 24-08-2014, 23:08   #5
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http://forums.evolutionm.net/ecuflas...s-enabled.html
seems since the geeks became traders they no longer advise lol! There's a couple of exceptions . Found this useful link for anyone who's curious...
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Old 25-08-2014, 13:14   #6
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Does it not increase the chance of starting knock?, I know my car (GTO) is very picky around 4000rpm and having it 1 point leaner would definitely cause it to start knocking.

Don't know it it would be better or worse on turbos with higher output (probably worse if you are octane limited on straight petrol?).
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Old 25-08-2014, 16:12   #7
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Quote:
Originally Posted by keithmac View Post
Does it not increase the chance of starting knock?, I know my car (GTO) is very picky around 4000rpm and having it 1 point leaner would definitely cause it to start knocking.

Don't know it it would be better or worse on turbos with higher output (probably worse if you are octane limited on straight petrol?).
Thanks for input... yeah that is something i thought about too. using pump fuels that are not always consistent makes you wonder if lean spool enabled is wise. Could cause temperatures to rise considerably if your in that lean region often. Some say you should build a very safe hi octane fueling map with plenty of safety. Then activate lean spool but increasing the the points of deviation in .2 increments. that will give you the benefit of the leaner mixture and if you tune right the longer the pull it will quickly switch back to the high octane map. What i'm wondering is once a setup gets pretty far from stock these lean spool tables must need to be heavily modified??? or couldn't they cause very high cylinder/head temps with lean conditions.

I have been looking into the stock ecu side of things a bit and am just trying to understand... so wondered what others do. I would think the start rpm for LS should move from 2000rpm to more like 3500 as you cant really get the big turbine to do much down there so whats the point in running so lean. then lean out around the actual spool area... the other thing that I cant understand is why they run LS to the rev limit I would have thought with a big turbo run LS between 3500-5800 then allow the switch to the high octane map.

Also anyone know why I cant view or adjust all my lean spool tables in ecuflash? also I have a lot of other tables I cant access My ROM is 88570008
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Old 25-08-2014, 16:16   #8
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Also if you set Valet mode max rpm limit to the lowest number am I right in thinking that will make the car unable to start??? like a safety function?
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Old 25-08-2014, 16:25   #9
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You need the correct xml to show you all you can adjust
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Old 25-08-2014, 16:33   #10
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Quote:
Originally Posted by leecavturbo View Post
You need the correct xml to show you all you can adjust
I just cant get my head around all this xml and .bin and rom stuff you can navigate around standalone software like motec and link with relative ease... however this being a "hacked" software requires some computer software knowledge lol!

Will get there in the end... any ideas where i get the correct XML and where I put it to get things working completely. I need access to the fan maps, knock thresholds, LS and few other things. I have the tephra mods however.
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Old 25-08-2014, 16:37   #11
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Lean spool can run up to 1 AFR leaner on the 1st pull which can create some higher knock counts than you would normally see.

On bigger turbo stuff I tend to leave it on up to a set rpm, so if was mapping say an S205 I would turn it off 250-300 rpm before peak boost.
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Old 25-08-2014, 17:08   #12
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Quote:
Originally Posted by Lee5 View Post
Lean spool can run up to 1 AFR leaner on the 1st pull which can create some higher knock counts than you would normally see.

On bigger turbo stuff I tend to leave it on up to a set rpm, so if was mapping say an S205 I would turn it off 250-300 rpm before peak boost.
Thanks for your input bud, appreciated
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Old 26-08-2014, 12:14   #13
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Can anyone help me... I have all the latest rom and xml's as a couple of very kind members sent me them. Why cant I access all the tables within the software... really getting hacked off now. Is it because i dumped the file from ecu with a older version of ecuflash and have since upgraded to the latest version?? above pics shows my rom and the fields in grey i have no access too.
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Old 26-08-2014, 14:14   #14
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change your user level

hit file /options/ user level
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Old 26-08-2014, 14:44   #15
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yes mate i'm in developer mode... yhpm
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