IDA idle jet question
08-26-09, 03:24 PM
#1
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IDA idle jet question
long story short but i finally ordered the jets that mazda recommends in the comp book for a PP 12A.
with the 80 idle jet and 120 holder like mazda says it idles nicely at 1000rpms, but the idle screws are all the way in.
i have a 70 idle jet, would this be too big of a jump for the adjusting screws?
or should i get a 75 idle jet.
basically how big of a jump is 10? 5? how big of a range do the mixture screws have.
i'd go do it, but its too loud, and i need a fan on the radiator...
with the 80 idle jet and 120 holder like mazda says it idles nicely at 1000rpms, but the idle screws are all the way in.
i have a 70 idle jet, would this be too big of a jump for the adjusting screws?
or should i get a 75 idle jet.
basically how big of a jump is 10? 5? how big of a range do the mixture screws have.
i'd go do it, but its too loud, and i need a fan on the radiator...
08-28-09, 11:42 AM
#2
10 is BIG.
If it's idling at 1000rpms, the idle speed screw isn't screwed in all that much which is good. So try the 75. A richer idle fuel jet really helps the progression circuit. And, with those big intake ports opening quickly, it'll need it.
Couldn't hurt to try the 70 you have now. Got a wideband to monitor mixture changes?
If it's idling at 1000rpms, the idle speed screw isn't screwed in all that much which is good. So try the 75. A richer idle fuel jet really helps the progression circuit. And, with those big intake ports opening quickly, it'll need it.
Couldn't hurt to try the 70 you have now. Got a wideband to monitor mixture changes?
08-28-09, 06:07 PM
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well i put the 70's in, and initially it made no difference. but i think its because the idle speed screw was in too far.
today i warmed it up, and turning the idle speed screw out, lowered the idle, and then it came up, with the mixture screws about 1/2 turn out, which seems good! idle is a machine gun like 800
my next step is to put the wideband in...
today i warmed it up, and turning the idle speed screw out, lowered the idle, and then it came up, with the mixture screws about 1/2 turn out, which seems good! idle is a machine gun like 800
my next step is to put the wideband in...
08-28-09, 06:09 PM
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08-29-09, 12:46 AM
#7
long story short but i finally ordered the jets that mazda recommends in the comp book for a PP 12A.
with the 80 idle jet and 120 holder like mazda says it idles nicely at 1000rpms, but the idle screws are all the way in.
i have a 70 idle jet, would this be too big of a jump for the adjusting screws?
or should i get a 75 idle jet.
basically how big of a jump is 10? 5? how big of a range do the mixture screws have.
i'd go do it, but its too loud, and i need a fan on the radiator...
with the 80 idle jet and 120 holder like mazda says it idles nicely at 1000rpms, but the idle screws are all the way in.
i have a 70 idle jet, would this be too big of a jump for the adjusting screws?
or should i get a 75 idle jet.
basically how big of a jump is 10? 5? how big of a range do the mixture screws have.
i'd go do it, but its too loud, and i need a fan on the radiator...
if its all the way in, then it is the jet is too big. size of ur venturies and exhaust? thanks to index/number drills, I can re-use the VW jets that I've collected over the years.
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08-29-09, 10:50 AM
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