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Old 11-28-2017, 02:32 AM   #1
maxitoman007
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Default LH 2.2 timing advance for performance.

Have done quite a few mods on my 87 740 turbo but I haven't had the chance to play with ignition timing very much. I've heard of people running as much as 24 deg advanced. Lh2.2 is adjustable via the distributor conveniently at least for base timing so what should I do to optimize my performance?
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Old 11-28-2017, 02:54 AM   #2
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I ran 20° of static advance and a MSD BTM to pull timing with boost. It sort of worked but that is more than microsquirt money as is.
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Old 11-28-2017, 10:15 AM   #3
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Yea I meant more just using the stock hardware.
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Old 11-28-2017, 11:41 AM   #4
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That's playing with fire. At a certain point your EZK is already at max ignition retard and if you add more boost, it won't retard any more and that will cause detonation. The reason you would bump timing on EZK would be to get a bit more low and midrange torque.
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Old 11-28-2017, 11:49 AM   #5
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Put it on a dyno and see what it likes, otherwise your guess is as good as anyone's.
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Old 11-28-2017, 12:25 PM   #6
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Dump in some toluene or high octane gas, o thought about buying some 100-110 and experimenting with the base timing but went ms before I got around to it.
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Old 11-28-2017, 01:38 PM   #7
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So best bet is just to keep it stock around 12 degrees btdc? Because I currently have it set around 14/15 thinking it would give me more power.
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Old 11-28-2017, 01:47 PM   #8
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What kind of fuel are you using?
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Old 11-28-2017, 02:57 PM   #9
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What kind of fuel are you using?
Currently 94 octane with up to 10% ethanol. Wondering if 91 non-ethanol would be better
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Old 11-28-2017, 03:31 PM   #10
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Octane rating is octane rating. Specific energy is specific energy. Think it through.
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Old 11-28-2017, 03:34 PM   #11
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Yea I meant more just using the stock hardware.
Advance it until it blows up and then back it down a degree or 5.
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Old 11-28-2017, 04:48 PM   #12
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Octane rating is octane rating. Specific energy is specific energy. Think it through.
I'm very sorry but I do not understand those terms.
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Old 11-28-2017, 04:59 PM   #13
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I'm very sorry but I do not understand those terms.
Gasoline has more heat energy than alcohol, so pure 91 will have more energy stored than 94 e10 however the 94 will be more detonation resistant.
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Old 11-28-2017, 10:26 PM   #14
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You can always reprogram the timing map and burn a chip for it and stick it in your 2.2 ezk box that you cut the stock chip out of and put a socket in. Turnerpro xdf and ezk files here..

http://forums.turbobricks.com/showthread.php?t=268066

Best to probably pay me to burn a 40 pin dip chip if that is the route you want to go. Hard to find a programmer that will do it correctly. I had to modify mine so it would work.

The tuned bin I have has more timing low and less up high built for more boost!
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Last edited by sbabbs; 11-28-2017 at 10:34 PM..
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Old 11-29-2017, 02:27 AM   #15
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Noted, might have to contact you for some chips once I find some money to play with, as for now, should I just leave it stock based on the fuel I'm running?
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Old 12-02-2017, 12:51 AM   #16
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Bump, without chips should I return to base timing to around 12 btdc instead of 15?
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Old 12-02-2017, 02:46 PM   #17
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Bump

Last edited by maxitoman007; 12-02-2017 at 03:07 PM..
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Old 12-02-2017, 03:46 PM   #18
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Quote:
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Bump, without chips should I return to base timing to around 12 btdc instead of 15?
How's it running? Getting any detonation? Leave it alone if you're happy with it.
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Old 12-02-2017, 04:41 PM   #19
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Well I currently think I may have setup the timing belt a tooth off as my car only really comes alive above 4500rpm so I'm not sure. Does advancing base timing give you more power?
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Old 12-02-2017, 05:35 PM   #20
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Advancing the timing too much will result in the knock sensor system retarding the timing.
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Old 12-02-2017, 07:08 PM   #21
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Alright once I adjust the t belt I think I'll just set it back to stock.
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