WTF? Mapdot and dashpot, etc etc - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-08-2008, 02:51 AM   #1
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Default WTF? Mapdot and dashpot, etc etc

What ARE all of those? Everyone who has a clue talks about them like they are no big deal, then I sit around here feeling dumb. What are they, what do they do, how do they work.... etc?
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Old 02-08-2008, 02:55 AM   #2
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Mapdot and TPSdot are acceleration enrichments. So you can add fuel on tip in to improve throttle response. Get's rid of that lean tip in loss of power.
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Old 02-11-2008, 03:52 AM   #3
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but, why "dot"? Also, the MAP-based decel on MS-II beta is lame, way too aggressive. Get lower MAP for ONE data point and it thinks it's deceling? One of those things I will mess with later.

My bike, the turbo, had a broken accelerator pump for a while, and with the choke removed, the only way I could start it was taking a syring, blowing in the accel pump cyl, and watching it squirt fuel into the turbo, when it was full, it was like a enrichment circuit all on it's own, till it finally all evaporated awa...

Damnit, too drunk to handle the responsibility of a keyboard.
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Old 02-11-2008, 04:10 AM   #4
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What kind of bike was it? I've never seen a motorcycle carb with an accel pump..
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Old 02-11-2008, 08:05 AM   #5
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"dot" signifies derivative; they respond to changes in TPS/MAP
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Old 02-11-2008, 01:42 PM   #6
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Ok, "derivative over time" makes more sense then. Somehow, I had the picture of the little green "dot" on the map, and figured there was some difference between where dot was and what cell you were in, maybe a hysterises or something.

The bike is a KZ-1000, the carb is an old old Zenith carb, which was kinda a 1950's update to a 1920's design. It really only had one thing going for it, aside from fitting and being able to supply 250 hp of fuel: The main jet was thumbscrew adjustable, so you could "tune" just by reaching under the tank and twisting.
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