Ignition timing for turbo or supercharged renesis - post your maps
U-Stink-But-I-♥-U
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From: 12 o'clock on the Beltway.
Why do timing threads turn into crapfests?
This was particularly non-enlightening.
The way I see it, if the experts want to keep all the secrets to themselves, I am COMPLETELY ok with that. They deserve that and our respect. But us bumblefucks want to figure some of this **** out for ourselves. I suggest that be respected as well and leave the misdirection, intentional or otherwise, out of the discussion.
This was particularly non-enlightening.
The way I see it, if the experts want to keep all the secrets to themselves, I am COMPLETELY ok with that. They deserve that and our respect. But us bumblefucks want to figure some of this **** out for ourselves. I suggest that be respected as well and leave the misdirection, intentional or otherwise, out of the discussion.
Kane, it will probably be around 24 hours before I can get any information back to you but here's something for you to consider.
At first, I recall that we used a broad 30% increase in the AP values just to see if the issues we were experiencing were in fact dwell related. We kept everything else the same as our control. A 30% increase did seem to correct any spark blow out on the turbo RX8. I have been using an adapted version of those settings with adjustments made to back the dwell off in the lower and upper RPM range where a stronger spark isn't needed.
At first, I recall that we used a broad 30% increase in the AP values just to see if the issues we were experiencing were in fact dwell related. We kept everything else the same as our control. A 30% increase did seem to correct any spark blow out on the turbo RX8. I have been using an adapted version of those settings with adjustments made to back the dwell off in the lower and upper RPM range where a stronger spark isn't needed.
but i'll just make it "5" and be done with it
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Boosted Kiwi
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From: Y-cat-o NZ
Interestingly this thread was supposed to be about timing and not Dwell . Not that i'm bothered with that as at least SOME information has come out of the ensuing crapfest ....
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From: Hunterdon County
Mu ha.. ha...
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From: Cali
Ugh.
Take a look at the OE dwell table. You will see that the value for idle is around 1100.
Do you really believe the OE dwell request is for 1.1 seconds at idle?
If your alternator output is low, it jumps to 1.4 seconds!!!!
Do the math.
The dwell table is not in milliseconds.
The OE coils are special.
The LS2s have the widest dwell range imaginable.
However, this is not rocket science and all you Secret Squirrel nut cases need to get your heads out of your asses and stop acting like I owe it to you to spoon feed you.
Take a look at the OE dwell table. You will see that the value for idle is around 1100.
Do you really believe the OE dwell request is for 1.1 seconds at idle?
If your alternator output is low, it jumps to 1.4 seconds!!!!
Do the math.
The dwell table is not in milliseconds.
The OE coils are special.
The LS2s have the widest dwell range imaginable.
However, this is not rocket science and all you Secret Squirrel nut cases need to get your heads out of your asses and stop acting like I owe it to you to spoon feed you.
It was this big! No lie!
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From: Disneyland!
It was this big! No lie!
Joined: Mar 2009
Posts: 120
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From: Disneyland!
And if anyone gets anything outta the whole thing...its the attys...
I got into the wrong profession...
Oh...and nuts...cant do any of that without your nuts handy...
It was this big! No lie!
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From: Disneyland!
Anji
Joined: Jun 2006
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From: Dhaka, Bangladesh
Dwell
Kane,
I work with Ignition computers as I'm involved in conversion of Diesel engines in to NGV (Natural Gas). In the software I use to program the stand alone ignition computer, the dwell value can be adjusted in - % percentage. Basically 100% would mean dwell will be same duration as the spark duration. 110% means the coil will take 10% longer to charge and then provide spark with the same duration.
Looking at my SPT dwell map, could the map be battery voltage vs % time of dwell? That would mean 1208 might be 120.8% and 395 might be 39.5% of spark duration.
I work with Ignition computers as I'm involved in conversion of Diesel engines in to NGV (Natural Gas). In the software I use to program the stand alone ignition computer, the dwell value can be adjusted in - % percentage. Basically 100% would mean dwell will be same duration as the spark duration. 110% means the coil will take 10% longer to charge and then provide spark with the same duration.
Looking at my SPT dwell map, could the map be battery voltage vs % time of dwell? That would mean 1208 might be 120.8% and 395 might be 39.5% of spark duration.
Hmmm - could be. But the scale on the 3D graph would be off....I am kinda at the point where I don't know what it is - I just know how to make it better...... not the best plan but it does work.
Kane,
I work with Ignition computers as I'm involved in conversion of Diesel engines in to NGV (Natural Gas). In the software I use to program the stand alone ignition computer, the dwell value can be adjusted in - % percentage. Basically 100% would mean dwell will be same duration as the spark duration. 110% means the coil will take 10% longer to charge and then provide spark with the same duration.
Looking at my SPT dwell map, could the map be battery voltage vs % time of dwell? That would mean 1208 might be 120.8% and 395 might be 39.5% of spark duration.
I work with Ignition computers as I'm involved in conversion of Diesel engines in to NGV (Natural Gas). In the software I use to program the stand alone ignition computer, the dwell value can be adjusted in - % percentage. Basically 100% would mean dwell will be same duration as the spark duration. 110% means the coil will take 10% longer to charge and then provide spark with the same duration.
Looking at my SPT dwell map, could the map be battery voltage vs % time of dwell? That would mean 1208 might be 120.8% and 395 might be 39.5% of spark duration.
So after months of speculating and even erroneous input from people who are actively involved in RX-8 calibration testing and development, it took a professional ignition calibrator's input to figure out what I managed to figure out in my garage in 10 minutes with a cheap scope meter.
I'm not picking on you, a_ahlan. You are just sharing what you know.
But its just sad that all of the whiners in this thread just couldn't be bothered with the R&D, just because they knew someone had already figured it out.
It was more worthwhile to complain about it.
Last edited by MazdaManiac; May 22, 2009 at 01:29 PM.
So after months of speculating and even erroneous input from people who are actively involved in RX-8 calibration testing and development, it took a professional ignition calibrator's input to figure out what I managed to figure out in my garage in 10 minutes with a cheap scope meter.
You've made your point. I'm sure the relatively small hit to BHR's rep as a company that exhanged information freely with the RX-8 community about products was well worth it. Hard to put a value on that.
Not quite as hard to put a value on the subscriptions you picked up.
I divide by zero
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From: Spring Hill, FL
It cracks me up the **** I read and hear people talk about.. I mean don't get me wrong I've done a lot of stupid ****. As far as the LS2 coils I did my own setup with them and I'm thinking I'm set at 3.5ms.
When I set at a idle and rev my car it misses at like 4k and 5k but when you drive it...there is no miss.. I've turned and boost a few dozen times to 14psi and those coils have no misses what so ever when I'm driving.. I can cruise at the 4k or 5k without a miss but can't no load rev that high...stead that high. If I just hit the throttle and rap it out for the sound there is no miss.
By far I like the LS2 coils way over the OEM...it only took me 2 weeks till I had miss fires like no other on OEM that is.
When I set at a idle and rev my car it misses at like 4k and 5k but when you drive it...there is no miss.. I've turned and boost a few dozen times to 14psi and those coils have no misses what so ever when I'm driving.. I can cruise at the 4k or 5k without a miss but can't no load rev that high...stead that high. If I just hit the throttle and rap it out for the sound there is no miss.
By far I like the LS2 coils way over the OEM...it only took me 2 weeks till I had miss fires like no other on OEM that is.
Last edited by outinnowhere3193; Jul 5, 2009 at 03:31 PM.