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 Ran Without Catalytic Converter Now I Got Problems
 
dsm505
post Jul 11 2008, 10:22 PM
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i took my catalytic converter off and now my car is acting up. rpms go up slow, my new top speed is around 70mph. it dont keep ideal and it spuders.and thats with my catalytic converter back on.
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SeMi380
post Jul 11 2008, 10:25 PM
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well what'd you put in place of your cat
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dsm505
post Jul 12 2008, 04:00 AM
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nothing at all, I was just runing pure down pipe
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kris_stewart10
post Jul 12 2008, 12:37 PM
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not enough back pressure for your turbo to spool up you need a test pipe they are like thirty dollars on ebay if you dont want a cat that bad
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jonbonazza
post Jul 13 2008, 08:18 AM
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Uhh/... turbos dont need back pressure... thats whjy when people go turbo they get like 3" exhaust.
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fullmoon
post Jul 13 2008, 10:00 AM
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Sounds like he screwd up a sensor related to the cat?
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kris_stewart10
post Jul 13 2008, 10:11 AM
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QUOTE(jonbonazza @ Jul 13 2008, 08:18 AM)
Uhh/... turbos dont need back pressure... thats whjy when people go turbo they get like 3" exhaust.
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uh....NO matter how much you say you dont need back pressure

YOU have it every little bend causes back pressure and you need it
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EMC 3000gt
post Jul 13 2008, 01:07 PM
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The best Exhaust for a turbo charger is no exhaust at all. Any type of back pressure on a turbo vehicle is a restriction and will cause less power.
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militaryman108
post Jul 13 2008, 01:16 PM
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Your problems have nothing to do with running open DP
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SeMi380
post Jul 13 2008, 02:56 PM
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turbos create backpressure for your motor so the exhaust has nothing to do with getting the incorrect amount of backpressure
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fishloops1214
post Jul 13 2008, 04:58 PM
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I dont know if the turboed awd vehicles are the same but my RS has two oxygen sensors. There is one just after the cat. If you remove the cat you would have to flash the code out of the computer otherwise your car will not run correctly. :thumbsup:
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dsm505
post Jul 13 2008, 05:47 PM
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thats ob2 mean is ob1
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pwee05
post Jul 14 2008, 06:27 AM
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+1 with EMC and militaryman, back pressure for EFI engines is a myth. it is only relative to carbureted engines and NEVER applicable to these vehicles unless discussing how to eliminate it. Again, YOU DO NOT NEED ANY BACK PRESSURE.

dsm505 what other mods did you do at the same time? or did you just remove the cat and then put it back?
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dsm505
post Jul 14 2008, 02:08 PM
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its all stock i just took the cat off ran it like that for a day ,then i started to feel boging and the rpms would go up slow . so thats when i but the cat back on and it still did the samething
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MadHatterEvo
post Jul 14 2008, 02:33 PM
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Isn't there an O2 sensor after the cat? If there is, then it might be that the ECU was getting a wierd signal from it and tried to correct it. Then you put the cat back in but the ECU is still trying to fix the initial problem. Did you disconnect the battery for a few minutes?

It is usually the simple things that fixes the major problems...
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dsm505
post Jul 14 2008, 05:25 PM
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ill try disconnceting the battery for a few mins, thanks. but i just drove it with the cat back on today. RPMs still go up slow , fills like power lose becouse i cant rev up to redline and it spuders. and wastes a lot of gas. and there is no senser after the cat
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EMC 3000gt
post Jul 14 2008, 06:02 PM
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02 sensor is probably shot.
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dsm505
post Jul 14 2008, 08:13 PM
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i disconnected the battery for 5 mins .but no luck
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pwee05
post Jul 15 2008, 10:02 AM
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QUOTE(EMC 3000gt @ Jul 14 2008, 06:02 PM)
02 sensor is probably shot.
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+1 it might have been on it's way out and when you removed the cat back the increased flow might just have pushed the sensor over the edge.

PS i like your DSM dukes of hazzard avatar :gitara: :beer:
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jonbonazza
post Jul 15 2008, 01:30 PM
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QUOTE(pwee05 @ Jul 14 2008, 07:27 AM)
+1 with EMC and militaryman, back pressure for EFI engines is a myth. it is only relative to carbureted engines and NEVER applicable to these vehicles unless discussing how to eliminate it. Again, YOU DO NOT NEED ANY BACK PRESSURE.

dsm505 what other mods did you do at the same time? or did you just remove the cat and then put it back?
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I see how it is dont +1 me even though I was the first to say it. =( HATER! lol :P <3
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