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| Detonation is gone! https://www.slantsix.org/forum/viewtopic.php?t=23952 |
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| Author: | Sam Powell [ Sun Jul 08, 2007 6:01 am ] |
| Post subject: | Detonation is gone! |
I raised the VE number of the bottom two rows of the VE table by four key strokes each, which is .01% for each key stroke. That means I added .04 fuel to all the highest boost cells from about 2200RPM on up. I took it out for a spin last night, and decided, "what the H" and pushed it into boost expecting the boost gauge to light up. It did: GREEN. Which means no detonation! It is the light which comes on when the gauge is activated. AT first, I reacted to it as if there were detonation, since I was so used to it, and it hadn't registered that the GREEN light was on. Of course I had to do it several times to be sure. I came up fast on the back of a Cadilac Escalade, and I think he might of thought I was a cop, because he slowed way down, and forced me to go the last mile home way below the speed limit. I guess he was my gaurdian anngel in a sense. I went to bed feeling good. Now, it was a damp evening, and the air was damp, so that might have helped. Do you think water/meth injection would allow me to run regular gas, and maybe advance the timing a bit? It is down to 13 degrees in those cells. Matt, Do you guys sell the DEvil's own injection kits? Sam |
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| Author: | Matt Cramer [ Sun Jul 08, 2007 5:49 pm ] |
| Post subject: | |
Thanks for asking, Sam, but we don't have water injection hardware. We've been planning some additions, but neither Jerry nor I have tested water injection out in person yet. As to whether it would allow you to advance the timing, it's quite possible if detonation is what's holding your timing back. If the power the engine is making falls off above 13 degrees advance, it probably won't help. Did you dyno tune the ignition advance before? I know you'd taken the engine through a couple different phases and so I can't remember if this is the case. |
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| Author: | Sam Powell [ Sun Jul 08, 2007 7:12 pm ] |
| Post subject: | |
The dyno shop was run by neandrethals. They had cut the timing back to 4 degrees, and it still had preignition. They were a total waste of money, and time, and the car ran awful when I got it back. So far I have been watching AF ratio, and building fuel and taking out timing a little at a time to get the detonation gone. The turbo guys that have posted here so far have all mentioned numbers in the mid teens for timing on a boosted slant, so that was the basis for going down that low. It seems to run well now, but no, I haven;t dyno tuned again. This is all seat of the pants stuff at this point. |
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| Author: | Matt Cramer [ Mon Jul 09, 2007 10:15 am ] |
| Post subject: | |
Quote: The dyno shop was run by neandrethals. They had cut the timing back to 4 degrees, and it still had preignition. They were a total waste of money, and time, and the car ran awful when I got it back. So far I have been watching AF ratio, and building fuel and taking out timing a little at a time to get the detonation gone. The turbo guys that have posted here so far have all mentioned numbers in the mid teens for timing on a boosted slant, so that was the basis for going down that low. It seems to run well now, but no, I haven;t dyno tuned again. This is all seat of the pants stuff at this point.
Ah, now I remember the rest of the story. In that case, you're probably best ignoring what the dyno tuners did; sounds like for some reason they leaned it out under boost and weren't watching their exhaust measurements at all.
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| Author: | Sam Powell [ Mon Jul 09, 2007 11:00 am ] |
| Post subject: | |
Actually they made the mixture super rich under boost, and were killing it. Not only did it run like crap, but it used gas like it was free. I think the detonation problems were caued by hot plugs, and a hot thermostat, and they never even thought to look at that part of the equation, even though they chose and installed the plugs. They just kept adding fuel, and kept cutting back the spark until it would hardly run anymore. They DID get rid of detonation, but at what cost. I started over again with lean mixture, and more spark and worked my way back down but with a cooler thermostat, and cooler plugs. I also re-routed the inter-cooler piping, so that might have had somthing to do with getting rid of the detonation. All of those long threads here were a part of solving the puzzle, so your input was priceless. Sam[/u] |
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