car stalls ....suggestions??
03-23-2005, 05:16 PM
#3
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Join Date: Oct 2004
Location: grove city ohio
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its an automatic if that matters.. why cant i go wot from dead stop?? and how do i test the maf let the car run and unplug?? (what should happen) also do i need a volmeter or some device to test the tps.. my idle stays nice and steaDY.. Its just when i go wot from a dead stop it stalls
03-23-2005, 05:25 PM
#5
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Location: grove city ohio
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i dont really like to abuse my cars like that.. i just bough the car and been fixing it up .. just replace fuel injector and installed 300zx fuel filter the car idles and runs great but when i go wot it stalls..only form a dead stop..ill check the tranny fluid again but i think it was still in the ok..im thinking maybe its timming or a clogged air filter..just was hoping someone might ofd had same prblem..
03-24-2005, 06:42 PM
#8
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When you press the pedal to the floor, the computer looks at the tps, maf/map, iat and sees a Y co-ordinant. It looks at the tach signal and sees an X co-ordinat. Using these co-ordinants it performs a lookup on a table in its read only memory. Based on the value it finds, it modulates the pulsewidth of the fuel injectors to add more fuel.
You have air comming in through the butterfly valve you opened with your foot, and the computer is adding a comensurate ammount of fuel. These two fluids mix in the intake to form the air fuel ratio, and the suction action of the pistons, working within the parameters of the valve motion, draws the mixture in.
As you know, this air-fuel mixture has a tremendous effect on the vehicles performance. For performance, ideal mixture is around 12.5 to 1 for all intents and purposes. For daily drivers we usually see 14.5 to 1. A richer mixture past 12.5 to 1 can be used to make a cooler mixture, and keep exhaust gas tempuratures down. However a mixture richer than 12.5 to 1 isnt buying us any performance, just protection.
Unless your vehicle has a very higly tunable computer(aka lots and lots of boxes on its lookup table to provide a fine granulation of fuel needs at specific load) and your highly tunable computer has been tweaked on a dyno by a skilled professional, your computer is generalizing to some degree. Going to WOT on launch with usually just blow excess fuel out the back of the car(even still, black smoke in this scenerio is happy smoke), and not buy you any performance.
Dont let the big boys at the track confuse you with thier launching strategies. Some people get confused by this. When you have a transbrake, and a multistage rev-limiter, you can lean on the gas all the way with the transbrake engaged, bring your rpms up to 6k and let it rip. Thats them, not us
Generally speaking, you will not measure a significant gain launching at full throttle over 3/4 throttle. As soon as you launch, BY ALL MEANS HAMMER DOWN. Thats why I say, 3/4 the first second, WOT there after.
JMB
You have air comming in through the butterfly valve you opened with your foot, and the computer is adding a comensurate ammount of fuel. These two fluids mix in the intake to form the air fuel ratio, and the suction action of the pistons, working within the parameters of the valve motion, draws the mixture in.
As you know, this air-fuel mixture has a tremendous effect on the vehicles performance. For performance, ideal mixture is around 12.5 to 1 for all intents and purposes. For daily drivers we usually see 14.5 to 1. A richer mixture past 12.5 to 1 can be used to make a cooler mixture, and keep exhaust gas tempuratures down. However a mixture richer than 12.5 to 1 isnt buying us any performance, just protection.
Unless your vehicle has a very higly tunable computer(aka lots and lots of boxes on its lookup table to provide a fine granulation of fuel needs at specific load) and your highly tunable computer has been tweaked on a dyno by a skilled professional, your computer is generalizing to some degree. Going to WOT on launch with usually just blow excess fuel out the back of the car(even still, black smoke in this scenerio is happy smoke), and not buy you any performance.
Dont let the big boys at the track confuse you with thier launching strategies. Some people get confused by this. When you have a transbrake, and a multistage rev-limiter, you can lean on the gas all the way with the transbrake engaged, bring your rpms up to 6k and let it rip. Thats them, not us
Generally speaking, you will not measure a significant gain launching at full throttle over 3/4 throttle. As soon as you launch, BY ALL MEANS HAMMER DOWN. Thats why I say, 3/4 the first second, WOT there after.JMB
03-27-2005, 09:59 AM
#9
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Join Date: Oct 2004
Location: grove city ohio
Posts: 146
Originally posted by jbayles
When you press the pedal to the floor, the computer looks at the tps, maf/map, iat and sees a Y co-ordinant. It looks at the tach signal and sees an X co-ordinat. Using these co-ordinants it performs a lookup on a table in its read only memory. Based on the value it finds, it modulates the pulsewidth of the fuel injectors to add more fuel.
You have air comming in through the butterfly valve you opened with your foot, and the computer is adding a comensurate ammount of fuel. These two fluids mix in the intake to form the air fuel ratio, and the suction action of the pistons, working within the parameters of the valve motion, draws the mixture in.
As you know, this air-fuel mixture has a tremendous effect on the vehicles performance. For performance, ideal mixture is around 12.5 to 1 for all intents and purposes. For daily drivers we usually see 14.5 to 1. A richer mixture past 12.5 to 1 can be used to make a cooler mixture, and keep exhaust gas tempuratures down. However a mixture richer than 12.5 to 1 isnt buying us any performance, just protection.
Unless your vehicle has a very higly tunable computer(aka lots and lots of boxes on its lookup table to provide a fine granulation of fuel needs at specific load) and your highly tunable computer has been tweaked on a dyno by a skilled professional, your computer is generalizing to some degree. Going to WOT on launch with usually just blow excess fuel out the back of the car(even still, black smoke in this scenerio is happy smoke), and not buy you any performance.
Dont let the big boys at the track confuse you with thier launching strategies. Some people get confused by this. When you have a transbrake, and a multistage rev-limiter, you can lean on the gas all the way with the transbrake engaged, bring your rpms up to 6k and let it rip. Thats them, not us Generally speaking, you will not measure a significant gain launching at full throttle over 3/4 throttle. As soon as you launch, BY ALL MEANS HAMMER DOWN. Thats why I say, 3/4 the first second, WOT there after.
JMB
When you press the pedal to the floor, the computer looks at the tps, maf/map, iat and sees a Y co-ordinant. It looks at the tach signal and sees an X co-ordinat. Using these co-ordinants it performs a lookup on a table in its read only memory. Based on the value it finds, it modulates the pulsewidth of the fuel injectors to add more fuel.
You have air comming in through the butterfly valve you opened with your foot, and the computer is adding a comensurate ammount of fuel. These two fluids mix in the intake to form the air fuel ratio, and the suction action of the pistons, working within the parameters of the valve motion, draws the mixture in.
As you know, this air-fuel mixture has a tremendous effect on the vehicles performance. For performance, ideal mixture is around 12.5 to 1 for all intents and purposes. For daily drivers we usually see 14.5 to 1. A richer mixture past 12.5 to 1 can be used to make a cooler mixture, and keep exhaust gas tempuratures down. However a mixture richer than 12.5 to 1 isnt buying us any performance, just protection.
Unless your vehicle has a very higly tunable computer(aka lots and lots of boxes on its lookup table to provide a fine granulation of fuel needs at specific load) and your highly tunable computer has been tweaked on a dyno by a skilled professional, your computer is generalizing to some degree. Going to WOT on launch with usually just blow excess fuel out the back of the car(even still, black smoke in this scenerio is happy smoke), and not buy you any performance.
Dont let the big boys at the track confuse you with thier launching strategies. Some people get confused by this. When you have a transbrake, and a multistage rev-limiter, you can lean on the gas all the way with the transbrake engaged, bring your rpms up to 6k and let it rip. Thats them, not us
Generally speaking, you will not measure a significant gain launching at full throttle over 3/4 throttle. As soon as you launch, BY ALL MEANS HAMMER DOWN. Thats why I say, 3/4 the first second, WOT there after.JMB
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