Anyone running an aftermarket Misfire system - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-02-2007, 06:38 PM   #1
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Default Anyone running an aftermarket Misfire system

Just liek the post says. I was wondering if anyone was running a misfire system with any success.
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Old 09-02-2007, 06:40 PM   #2
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a misfire system? Like a flamethrower?
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Old 09-02-2007, 07:03 PM   #3
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lol no. a system that allows you to keep the revs up without accelerating, which means you can keep boost and powerband but not go too fast through a corner or downhill section.
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Old 09-02-2007, 07:13 PM   #4
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You mean like ALS(anti-lag system)?
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Old 09-02-2007, 07:22 PM   #5
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hmmm never hear of an ALS. what is that and how does it work?
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Old 09-02-2007, 07:27 PM   #6
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I think they call anti-lag a "misfiring system" in initial-d. Takumi blew his original engine racing a guy who had one on his Evo.

Maybe that's just what they call it in Japan?

It would get really expensive replacing the turbo every week.

Basically it tries to keep the turbo spooled when you are off the throttle, I think it works by burning fuel in the exhaust manifold. Sometimes it is done strictly with engine management (keep spraying fuel off throttle, and very late spark) and others with special equipment installed in the exhaust manifold.

Last edited by Mechazawa; 09-02-2007 at 07:33 PM. Reason: added an explanation
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Old 09-02-2007, 07:57 PM   #7
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why not just use flatshift in ms?
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Old 09-02-2007, 07:58 PM   #8
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Initial D was where I originally heard about it. But there is a company that makes a small box that splices into the ecu. I cant remember who makes it...hks,apexi, greddy...someone like that.
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Old 09-02-2007, 08:02 PM   #9
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http://www.grid.co.jp/en/list/40_01.html

just found this. not what i had originially found but same thing.
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Old 09-02-2007, 08:08 PM   #10
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Isn't anti-lag where you spray excess fuel so that it will combust in the exhaust manifold maintaining spool while destroying your mani and turbo at the same time? Sounds destructive.
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Old 09-02-2007, 10:57 PM   #11
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It very specifically is injecting more fuel into the exhaust manifold causing the gas inside the manifold to expand keeping the turbo spun up. Alternatively people may be confusing it with something like the Bee Rev Limiter as both are about equally destructive to a Catalytic Converter which uses Spark pulling instead of fuel pulling for a rev limit.

Bottom line..both cause flames out your tailpipe and only one is some what preservative modification for your engine...the other (being a ALS or MisFire) is very very destructive..probably won't do much to the manifold but boy will it make hell of the turbo.
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Old 09-02-2007, 11:02 PM   #12
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any other systems out there to keep boost up?
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Old 09-03-2007, 01:47 AM   #13
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Quote:
Originally Posted by piratetim View Post
lol no. a system that allows you to keep the revs up without accelerating, which means you can keep boost and powerband but not go too fast through a corner or downhill section.
ummm, not that this thread makes much sense, but why not just modulate/control the throttle with the gas pedal going through the corner. and why would you want to stay in boost if you are trying not to go too fast, sounds like an oxymoron doesn't it?

make some sense guy!!
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Old 09-03-2007, 03:21 AM   #14
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Old 09-03-2007, 03:27 AM   #15
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^ haha

I know it's going to sound weird when I use the flatshift and no one hears the BOV until I stop accelerating.
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Old 09-03-2007, 04:27 AM   #16
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Pirate Tim...is there any particular reason you are trying to keep boost up? I mean..do you already have turbo and just find that you need the power the moment you hit the pedal out of a turn or something?

Generally i think it's concerns of "responsiveness" that people lean towards N/A or super charged setups. The only other thing you could really consider is getting yourself ITBs with turbo and having a really small turbo at that.

There's really nothing else out there for you, outside of causing additional explosions in your exhaust there's nothing to keep you in spool, other than some nice throttle modulation. If you haven't turbo'd yet. Consider going M.S. control of things like spark pull for rev limit and flat shifting should help with keeping the turbo spooled. Otherwise, you look to be pretty out of luck. unless you wanted to do something wacky like a twin turbo setup and find some method by which you would keep a turbo semi-constantly spooled even if the waste gate is open so that when you drop out of power from the second turbo the first doesn't have to spool up.
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Old 09-03-2007, 05:18 AM   #17
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I wonder if anyone has tried using water injection into the exhaust manifold. Upon injection, the water would immediately turn to steam and expand tremendously. OTOH, the reduction in temperature could completely counteract this effect.
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Old 09-03-2007, 05:37 AM   #18
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Retard the hell out of your ignition timing and your turbo will spool like made. I have a 2-step rev-limiter that pulls the timing back to -17deg (if need be) to keep the rpm at 5000 for launches. It'll do that at 2000 if you really wanted to. Full boost at 2000. It's hell on the head/valves but yuo go like hell. I don't even have to release the throttle for shifts since the 2-step is clutch activated. I figure I'll be blowing a trans or rear-end soon.

"misfire system" = rev-limiter ??
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Old 09-03-2007, 05:54 AM   #19
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After Max Evas post, i started thinking real hard about a mechanical antilag system and the idea of somehow using inertia to our favor came to mind. I think it would be neat if somehow a dual turbine setup could be used where there is one turbine that acts as normal and another one that is designed to be slightly heavier and carry energy through a shift via a clutch system that is vac/boost controlled (I.e. clutch engages at atmospheric pressure).

Anyway its probably a dumb idea so flamesuit on.
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Old 09-03-2007, 05:59 AM   #20
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How about completely blocking the inlet of the turbo? Ever put your hand over a vacuum cleaner hose? rpm goes up because it takes less power to spin a fan in a vacuum. (duh) Maybe that would keep the turbo spun up during shifts.
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