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Old 02-13-2010, 11:18 AM   #1
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XCal3 Spark +/-

Hi guys, a tuning noob here. The spark settings confuse me a bit. "-1 Degrees" means the spark timing is retarted one degree or advanced one degree?

Thanks!


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Old 02-13-2010, 12:12 PM   #2
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Thats retarded.... seriously. (I just couldnt resist)

Keep in mind that with the hand held tuner your adding/subtracting timing everywhere not just at WOT.

If you add 1* of timing you add it at idle, redline, part throttle, wide open throttle and every point inbetween
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Old 02-13-2010, 12:37 PM   #3
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Hmm.. well, I'm no going to change the *global* spark settings so your comment about adding it everywhere does not apply.
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Old 02-13-2010, 02:39 PM   #4
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If you have a tune , why change it at all , adding timing could do more damage then good , I would let your tuner make those decisions unless you know how to tune

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Old 02-13-2010, 03:25 PM   #5
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So let's say that I want to try high octane gas - higher than what the tune was made for. Would it make sense to advance spark timing a degree or two then?
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Old 02-13-2010, 03:42 PM   #6
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Do you have a black interior? If so, can I buy it from you when you F up your motor?
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Old 02-13-2010, 04:41 PM   #7
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Come on guys, I chatted about this with my dad recently. Back then when tuning the timing meant fiddling with the distributor (which was a real pain) occassional pinging was the norm. I don't believe that motors have gotten that weaker since then to make them blow up. Plus we have a ping sensor that would kick in if necessary right?

I really don't like this "don't touch it because you don't know what you're doing" kind of response that everyone here gets when they ask about adjusting ECU parameters. If it was that dangerous the option to customize it would not be in the XCal at all.
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Old 02-13-2010, 04:47 PM   #8
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Ok... higher octane gas is less combustable but burns longer and more efficient. Sure, you could possibly advance the timing a little bit, however, there is much more to it than just spark advance. You have injector timing and duration to think about as well. You also need to think about your plugs and ignitions. If you advance the timing too much without enough fuel to compensate, you're gonna grenade your engine.
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Old 02-13-2010, 06:02 PM   #9
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Quote:
Originally Posted by chakotay View Post
Come on guys, I chatted about this with my dad recently. Back then when tuning the timing meant fiddling with the distributor (which was a real pain) occassional pinging was the norm. I don't believe that motors have gotten that weaker since then to make them blow up. Plus we have a ping sensor that would kick in if necessary right?

I really don't like this "don't touch it because you don't know what you're doing" kind of response that everyone here gets when they ask about adjusting ECU parameters. If it was that dangerous the option to customize it would not be in the XCal at all.
Pinging was the norm ? I have been tuning sence 1976 and pinging was never the norm reguardless of the engine , year of the car , fuel used

There is nore to tuning now then just adding 1 deg of timing , contact your tuner and get a tune for 91 and 93 if you got the tuning from me then you get free tune updates

My opinion is the xcal shouldnt come with the timing and fuel option because people dont know how to use them properly , In this case the "don't touch it because you don't know what you're doing" kinda seems to come into play

Tom
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Old 02-13-2010, 07:26 PM   #10
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Thank you Smithboy and Tom for useful info. I do have a tune from you Tom and - don't get me wrong - it was a night and day difference going from stock The fact that you disapprove of XCal putting those options there kind of explains a lot. You must be tired of warning people not to mess with them

So let's say that I'm now convinced that the only reason the device allows me to change spark timing is that they can advertise it as a cool feature to make schmucks like me buy it. Since you also mentioned fuel - would there be any circumstances when it would make sense for me to change the mixture richness? Let's say I install a wide-band sensor, log a couple of WOT runs, and determine that it runs too rich. Would it be safe to use that option in the device or should I rather contact you to get another tune?
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