Starving above 4500 RPS's
#1
"1ST GENS" THE REAL RX-7!
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Starving above 4500 RPS's
Just something to throw out.
My 84 12a seems to be starving for fuel over 450000-5000 RPM's Its all bone stock with the nikki and full factory exaust including cats. The rats nest is still intact and i have no vac leaks.
It will run right up to the red-line in neutral but under load it wants to sputter a little and runs out of gas @ 4500-5000.
The car has 114k on it and not even a whisp of smoke some of the NY guys have seen her and can attest to how clean she is.
If anyone has an idea please let me know.
Thanks
Jay
1984 GSL Misty Blue Metallic bone stock
My 84 12a seems to be starving for fuel over 450000-5000 RPM's Its all bone stock with the nikki and full factory exaust including cats. The rats nest is still intact and i have no vac leaks.
It will run right up to the red-line in neutral but under load it wants to sputter a little and runs out of gas @ 4500-5000.
The car has 114k on it and not even a whisp of smoke some of the NY guys have seen her and can attest to how clean she is.
If anyone has an idea please let me know.
Thanks
Jay
1984 GSL Misty Blue Metallic bone stock
#2
84SE-EGI helpy-helperton
One shot fix: replace fuel filter.
The problem with the fuel filter on these cars is that once they get clogged, they prevent the carb bowls from getting adequate pressure to keep them full under WOT and high speed operation. As the fuel pump is running without load, the engine doesn't require that much fuel to get to redline. Under a load, the fuel demands are very high, and will require at least 4-6psi (carb) in order to supply enough fuel to keep accelerating.
The FF is located under the car on the left side, just in front of the rear axle. It usually hangs in a metal wire hanger and is held on the line with 2 hose clamps. Make sure that your replacement filter is flowing the right direction, and then get the hose clamps tight.
Reply back if that doesn't fix it - I think it will...
The problem with the fuel filter on these cars is that once they get clogged, they prevent the carb bowls from getting adequate pressure to keep them full under WOT and high speed operation. As the fuel pump is running without load, the engine doesn't require that much fuel to get to redline. Under a load, the fuel demands are very high, and will require at least 4-6psi (carb) in order to supply enough fuel to keep accelerating.
The FF is located under the car on the left side, just in front of the rear axle. It usually hangs in a metal wire hanger and is held on the line with 2 hose clamps. Make sure that your replacement filter is flowing the right direction, and then get the hose clamps tight.
Reply back if that doesn't fix it - I think it will...
#5
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Originally Posted by RustyRotary
"Starving above 4500 RPS's"
270,000 RPMs? Wow, you're really going for a high-rev engine! I'm happy with the 8,000 mine can do
I noticed that i typed that after the post. Just shows that some of you are on the ball.
It is a R26B 4 Rotor Turbine motor that WOT hits 300,000 RPM's
Thanks for the laugh, and the help with the filter prob.
jay
Sorry, couldn't help it
270,000 RPMs? Wow, you're really going for a high-rev engine! I'm happy with the 8,000 mine can do
I noticed that i typed that after the post. Just shows that some of you are on the ball.
It is a R26B 4 Rotor Turbine motor that WOT hits 300,000 RPM's
Thanks for the laugh, and the help with the filter prob.
jay
Sorry, couldn't help it
It is a R26B 4 Rotor Turbine motor that WOT hits 300,000 RPM's
Thanks for the laugh, and the help with the filter prob.
jay
#6
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ok so i replaced the fuel filter ($4.07) i love cheap parts.
and alas no better....
I was wondering if my cats may be clogged and how i go about checking them?
Tomorrow i am going to do the dizzy,plugs,wires etc.etc.
does anyone else have any ideas????
jay
and alas no better....
I was wondering if my cats may be clogged and how i go about checking them?
Tomorrow i am going to do the dizzy,plugs,wires etc.etc.
does anyone else have any ideas????
jay
#7
Lives on the Forum
Main jets may be clogged.....
These are the symptoms that I had when this happened to me...
1. Car runs fine until you pass about 80% on the throttle. Then it looses power.
2. Going at highway speeds, you can let off the gas for a few seconds and then floor it with no difference (still lags). This test shows that you are not just outrunning your fuel pump because it gives the carb a chance to "catch up" (refill the float bowls with fuel) while you are off the throttle.
If your symptoms closely match those, then it is probably time for a carb rebuild. The main jets can get some buildup on them, which restricts the flow at higher demand levels. You can get enough fuel through for easy driving, but not enough for full throttle.
Hope this helps....
These are the symptoms that I had when this happened to me...
1. Car runs fine until you pass about 80% on the throttle. Then it looses power.
2. Going at highway speeds, you can let off the gas for a few seconds and then floor it with no difference (still lags). This test shows that you are not just outrunning your fuel pump because it gives the carb a chance to "catch up" (refill the float bowls with fuel) while you are off the throttle.
If your symptoms closely match those, then it is probably time for a carb rebuild. The main jets can get some buildup on them, which restricts the flow at higher demand levels. You can get enough fuel through for easy driving, but not enough for full throttle.
Hope this helps....
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#11
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tighten the screws at the top of the carb as they tend to loosen up with age'VIBRATIONS', HAD THE SAME PROBLEM AS YOU, I tightened the top plate of the carb and no more problems. That might be your problem! Jay
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help.............
i still have a starving problem over 4000 rpm's i did the fuel filter and checked every vac hose by hand.
the only thing i notice is that my exhaust smells very strong, not like gas but it has a strong smell ....
any ideas??????
jay
i still have a starving problem over 4000 rpm's i did the fuel filter and checked every vac hose by hand.
the only thing i notice is that my exhaust smells very strong, not like gas but it has a strong smell ....
any ideas??????
jay
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