Miss Under Boost
01-12-03, 08:16 PM
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Miss Under Boost
Damn, this board sux. I had this huge post typed up that took me 15 minutes, and I attached a file that was too big and it straight deleted everything i typed when i hit back and whored me like no other. Someone needs to fix that.
Im working on a friends 93. I found 2 problems so far and fixed them but it still doesnt run right. The hard pipe at the throttle body was warped and had a huge leak. We planed it flat and put some sillycone on it and it seals fine now. The 2nd problem was the coupler at teh turbo outlet to the pipe going to the IC was split.
Now the car drives fine and makes 10 psi of boost, but as SOON as it hits any amount of boost at any rpm, it falls on its face instantly. It acts like a honda when u put a turbo kit on it without putting the one way valve on it to keep boost out of the MAP sensor. I checked all the vacuum lines, and didnt see any off or any more boost leaks.
There are two things that are still wrong that I can see but im not sure if these would cause the problem or not, since I dont know much about these cars. (I mainly work on DSMs) The accordian style intake tube on the front turbo has been rubbing the AC pulley and has a huge hole in it. And there is a 1" air fitting on the driver side of the airbox that has nothing attached to it.
Anyone have any ideas?
Thanks in advance,
Eric
Im working on a friends 93. I found 2 problems so far and fixed them but it still doesnt run right. The hard pipe at the throttle body was warped and had a huge leak. We planed it flat and put some sillycone on it and it seals fine now. The 2nd problem was the coupler at teh turbo outlet to the pipe going to the IC was split.
Now the car drives fine and makes 10 psi of boost, but as SOON as it hits any amount of boost at any rpm, it falls on its face instantly. It acts like a honda when u put a turbo kit on it without putting the one way valve on it to keep boost out of the MAP sensor. I checked all the vacuum lines, and didnt see any off or any more boost leaks.
There are two things that are still wrong that I can see but im not sure if these would cause the problem or not, since I dont know much about these cars. (I mainly work on DSMs) The accordian style intake tube on the front turbo has been rubbing the AC pulley and has a huge hole in it. And there is a 1" air fitting on the driver side of the airbox that has nothing attached to it.
Anyone have any ideas?
Thanks in advance,
Eric
01-12-03, 08:21 PM
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The Power of 1.3
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I'm a bit confused. It drives fine and make 10lbs of boost, but dies if it makes any boost? Care to elaborate?
I assume by "falls flat on its face" you mean it stalls? The 1" air fitting is supposed to have nothing going to it, just a wierd rx-7 thing
As far as the accordian style hose goes, if it has a hole after the air filter, then the car is bassically ingesting unfiltered air, (as well as parts of the belt, more than likely) really not good, but shouldn't affect it's ability to run, as it is still getting air.
Why it stalls (?) when making boost, i have no idea.
I assume by "falls flat on its face" you mean it stalls? The 1" air fitting is supposed to have nothing going to it, just a wierd rx-7 thing
As far as the accordian style hose goes, if it has a hole after the air filter, then the car is bassically ingesting unfiltered air, (as well as parts of the belt, more than likely) really not good, but shouldn't affect it's ability to run, as it is still getting air.
Why it stalls (?) when making boost, i have no idea.
01-12-03, 08:31 PM
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Say your going down the street and you throttle it very lgihtly to keep it in vacuum, it goes fine but as soon as you open the throttle enough to build any boost at all, the car will act like it either blows spark out, or dumps too much fuel. It just instantly starts bucking and wont accelerate at all, it will actually just decellerate and do nothing. It was nighttime so it was hard to tell if it was spitting out any black smoke or anything. Is there any way to pull codes or datalog any information on an RX7? I have a datalogger for the DSMs and its easy for me to diagnose problems cause I can sit there and read almost every parameter.
01-12-03, 09:16 PM
#4
Big Snail
With car OFF...Try resetting the ECU (disconnect negetive cable on the battery for a couple of minutes then reconnect). Could be alot of things but try that first because the ECU needs to recalibrate for those air leaks you fixed. Aside from that also check plugs and plug wires to make sure they are tightly secured on the plugs....Tony
04-26-05, 05:42 PM
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Wankel Shmankel
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Damn, this board sux. I had this huge post typed up that took me 15 minutes, and I attached a file that was too big and it straight deleted everything i typed when i hit back and whored me like no other. Someone needs to fix that.
Im working on a friends 93. I found 2 problems so far and fixed them but it still doesnt run right. The hard pipe at the throttle body was warped and had a huge leak. We planed it flat and put some sillycone on it and it seals fine now. The 2nd problem was the coupler at teh turbo outlet to the pipe going to the IC was split.
Now the car drives fine and makes 10 psi of boost, but as SOON as it hits any amount of boost at any rpm, it falls on its face instantly. It acts like a honda when u put a turbo kit on it without putting the one way valve on it to keep boost out of the MAP sensor. I checked all the vacuum lines, and didnt see any off or any more boost leaks.
There are two things that are still wrong that I can see but im not sure if these would cause the problem or not, since I dont know much about these cars. (I mainly work on DSMs) The accordian style intake tube on the front turbo has been rubbing the AC pulley and has a huge hole in it. And there is a 1" air fitting on the driver side of the airbox that has nothing attached to it.
Anyone have any ideas?
Thanks in advance,
Eric
Im working on a friends 93. I found 2 problems so far and fixed them but it still doesnt run right. The hard pipe at the throttle body was warped and had a huge leak. We planed it flat and put some sillycone on it and it seals fine now. The 2nd problem was the coupler at teh turbo outlet to the pipe going to the IC was split.
Now the car drives fine and makes 10 psi of boost, but as SOON as it hits any amount of boost at any rpm, it falls on its face instantly. It acts like a honda when u put a turbo kit on it without putting the one way valve on it to keep boost out of the MAP sensor. I checked all the vacuum lines, and didnt see any off or any more boost leaks.
There are two things that are still wrong that I can see but im not sure if these would cause the problem or not, since I dont know much about these cars. (I mainly work on DSMs) The accordian style intake tube on the front turbo has been rubbing the AC pulley and has a huge hole in it. And there is a 1" air fitting on the driver side of the airbox that has nothing attached to it.
Anyone have any ideas?
Thanks in advance,
Eric
What do you mean by falls flat on its face:
the rpms increase but HP doesnt?
the car RPMS stay constant even when gas is applied?
The car's RPMS stutter?
Car runs rich when it does stutter?
This may not relate to your problem, but if your car vents all the boost the turbo generates, you can rev the car to higher rpms, but the car wont make very much power. at 2500+, the car will lose power. Where are you checking the boost from? the nipple on the Upper Intake Manifold? Maybe the boost you're seeing on the guage or whatever isn't reaching the motor.
BTW, I have no idea on the Honda with turbo, check valve, map sensor thing. I'm guessing a lot of the ppl on this board dont have turbo hondas either
04-26-05, 05:46 PM
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Wankel Shmankel
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If its backfiring/smoking, its running rich: possibly ignition problem (plugs, wires, coils)
If its not, it might be: boost problem, ECU or electronical problem (my car would stutter at 2k rpms and drop to 1300 or so at light throttle, I "fixed" the problem with a PFC
If its not, it might be: boost problem, ECU or electronical problem (my car would stutter at 2k rpms and drop to 1300 or so at light throttle, I "fixed" the problem with a PFC
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04-27-05, 01:22 AM
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Originally Posted by TurboSummit
Say your going down the street and you throttle it very lgihtly to keep it in vacuum, it goes fine but as soon as you open the throttle enough to build any boost at all, the car will act like it either blows spark out, or dumps too much fuel. It just instantly starts bucking and wont accelerate at all, it will actually just decellerate and do nothing. It was nighttime so it was hard to tell if it was spitting out any black smoke or anything. Is there any way to pull codes or datalog any information on an RX7? I have a datalogger for the DSMs and its easy for me to diagnose problems cause I can sit there and read almost every parameter.
04-27-05, 06:54 AM
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Originally Posted by Alcoholic
guys, tahmid bumped a two year old thread, don't bother trying to help the guy out anymore lol...
Anyways, thanks alcoholic for the input.
04-27-05, 11:39 AM
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Originally Posted by tahmid
Funny you mentioned that. You guys are always flaming the newbies for not using the search engine. And whenever we do, the threads never give a " how it was fixed". That is sad. Why doesnot anyone post the updates on how they actually fixed it.
Anyways, thanks alcoholic for the input.
Anyways, thanks alcoholic for the input.
He's long gone.
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