Power loss at 5k?
03-31-09, 04:50 PM
#1
Power loss at 5k?
My 1st gen when i floor it, it revs smooth all thought 1st and 2nd gear, but when i get to third that my secondarys are opened all the way, at 5000 rpms it just stays there like if it cant go no more because its got to much gas and its just flooding the engine. what can i do, i want to be able to floor my car though all my gears help.
03-31-09, 04:54 PM
#2
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03-31-09, 05:49 PM
#3
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I think you are making false assumptions. You're not losing power because you are flooding, but rather because you are running out of gas. By the time you've gotten yourself up to speed in 3rd gear, you've used up all of the "reserve" gas stored in the float bowls, and they aren't refilling fast enough to keep up with the demand.
This is because your fuel pump can't keep up. Why can't your pump keep up, you ask? That's because your puny little fuel filter, which is just barely adequate when brand new, has gotten a little bit of crud in it and is no longer flowing fast enough. (I hate those tiny little filters!)
Replace the fuel filter, and you should be fine (unless I am the one making false assumptions, that is)...
.
This is because your fuel pump can't keep up. Why can't your pump keep up, you ask? That's because your puny little fuel filter, which is just barely adequate when brand new, has gotten a little bit of crud in it and is no longer flowing fast enough. (I hate those tiny little filters!)
Replace the fuel filter, and you should be fine (unless I am the one making false assumptions, that is)...
.
04-01-09, 10:38 PM
#5
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I think you are making false assumptions. You're not losing power because you are flooding, but rather because you are running out of gas. By the time you've gotten yourself up to speed in 3rd gear, you've used up all of the "reserve" gas stored in the float bowls, and they aren't refilling fast enough to keep up with the demand.
This is because your fuel pump can't keep up. Why can't your pump keep up, you ask? That's because your puny little fuel filter, which is just barely adequate when brand new, has gotten a little bit of crud in it and is no longer flowing fast enough. (I hate those tiny little filters!)
Replace the fuel filter, and you should be fine (unless I am the one making false assumptions, that is)...
.
This is because your fuel pump can't keep up. Why can't your pump keep up, you ask? That's because your puny little fuel filter, which is just barely adequate when brand new, has gotten a little bit of crud in it and is no longer flowing fast enough. (I hate those tiny little filters!)
Replace the fuel filter, and you should be fine (unless I am the one making false assumptions, that is)...
.
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Rx7bgs366 (02-23-22)
04-07-09, 04:19 PM
#6
its not the filter or the pump cuz both are new, pump is brand new, filter is brand new. may be vacumm, floats are perfect and even flooring it the pump keeps up. theres a vacumm thing that opens a venturi right next to the manifold which i have topped of and i dont know where it goes so that venturi is constantly closed, could that be the problem? ill post a pic as soon as i can.
04-07-09, 08:42 PM
#7
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Try this, ease though first and 2nd gear....slowly.... slowly without much gas pedal bring 2nd gear to redline.....shift to third and floor it. If it pulls past 5000 RPM without any problem you are prolly having fuel delivery problems.
Another thing you may want to check is your "teeter totter" The CFM usage of your engine is low in 1st and 2nd gear due to the gearing in your car. Once you hit third gear, the enging needs the full wrath of the secondaries. If your teeter tot is fubar, your secondaries will not open.
Another thing you may want to check is your "teeter totter" The CFM usage of your engine is low in 1st and 2nd gear due to the gearing in your car. Once you hit third gear, the enging needs the full wrath of the secondaries. If your teeter tot is fubar, your secondaries will not open.
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04-07-09, 09:21 PM
#9
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Well you'd better tell that to my car then...
Sorry to disagree, but I've driven with secondaries disabled (long story) and the performance was pretty damn good as long as you were patient. I had no problems taking it to the redline without using secondaries. Perhaps your car lacks self confidence...
Sorry to disagree, but I've driven with secondaries disabled (long story) and the performance was pretty damn good as long as you were patient. I had no problems taking it to the redline without using secondaries. Perhaps your car lacks self confidence...
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Rx7bgs366 (02-23-22)
04-07-09, 09:57 PM
#10
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Well you'd better tell that to my car then...
Sorry to disagree, but I've driven with secondaries disabled (long story) and the performance was pretty damn good as long as you were patient. I had no problems taking it to the redline without using secondaries. Perhaps your car lacks self confidence...
Sorry to disagree, but I've driven with secondaries disabled (long story) and the performance was pretty damn good as long as you were patient. I had no problems taking it to the redline without using secondaries. Perhaps your car lacks self confidence...
I am ready for some mechanical action!!!
04-09-09, 10:39 AM
#13
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What fuel pump did you install (noted that the pump is new)? If it is an aftermarket pump of any kind, then you will most likely need a pressure regulator to go with it.
I do not understand your statement about the venturis, but I think you might be using the wrong term. If you look down into the barrels of the carb, you'll see some things shaped like an inverted cone (one in each barrel). Those are venturis.
I do not understand your statement about the venturis, but I think you might be using the wrong term. If you look down into the barrels of the carb, you'll see some things shaped like an inverted cone (one in each barrel). Those are venturis.
04-09-09, 05:48 PM
#14
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I think he's talking about the shutter valve here. If you are not going to actuate it with vacuum (it's supposed to shut on decel), you need to fix it open.
10-11-09, 12:50 AM
#16
Fuel Starvation?
Hey guys i posted this problem a while back with no answer, but lets give it another try. My 84 gs has great torque and speed at the low end and through first and second gear, When i get to third it revs up to around 5k and then it looses power and gets it back and looses it and gets it back, like humph humph humph humph. Then i let of the throttle and it goes normal or when i shift to 4th it will stop until i get to 4k in 4th t will do it again. All of this is on a straight line and at wot. My question is, do you guys think it's fuel starvation or i was thinking that it could be the firing of the spark because maybe i have the dizzy diaphrams connected incorrect? what do you think? i tried new fuel filter, checked bowl levels, floats are at correct level. i am out of ideas and i have a race in homestead speedway in december and would love to have this fixed by then. Thanks
will put video as soon as i can
will put video as soon as i can
10-13-09, 09:59 PM
#20
Hey guys, i need help again, i checked the lines, tank and filter again and everything is good, so i decided to finally change my stock inline pump with the se pump i had bought. I installed it and everythin worked great, but when i turn on the car it idles, but when i accelerate, tons of white smoke comes out and its not coolant as i can smell the fuel. I have a regulator and it's on, at idle the level in the carb glass are exacly centered, but when i accelerate, it smokes and the fuel just goes down and does not replenish in time unless i let iot go and let it idle again, until eventually it will just turn off, if i try to maintain it by accelerating it it will turn off even quicker, like to much air not enough fuel, yet the bowls are good unitl it turns off. help, i am racing in december and the car needs to have this fixed by then. thanks
10-13-09, 11:02 PM
#21
These are the links to the videos i was able to take off the problem. Let me know thanks, will upload tomorrow video of it with the se pump so you can take a look and diagnose what it is.
http://www.youtube.com/watch?v=x7wWIqjekPo
http://www.youtube.com/watch?v=FvHe9d_A9qc
http://www.youtube.com/watch?v=x7wWIqjekPo
http://www.youtube.com/watch?v=FvHe9d_A9qc
