I recently drove up to Tampa, FL for Central G35 meet to look at your exhaust system. I was surprised to see that the exhaust tips were discoloring and the bumper was also stained after a few hundred miles. After speaking to the owner he said his car has been burning about a quart or less in a weeks time. Upon further questioning he stated that he had purcahsed your test pipes at the same time. Do you think that the O2 sensors are not functioning with your test pipes? I've read some threads that mention the burning of oil with test pipes.

 

P.S. To the above. Member has a 06 coupe with no other mods

 

Hey jax... I have been looking at the service manual and reading up on the intake and exhaust a little bt and have a theory of my own.

Since O2 sensors only feedback oxygen level information which in turns adjust air and fuel trim I do not think the oil burning could be related to the O2. Rather I suspect that the change in intake/exhaust pressure is some how tampering with the pcv blowby.

I do not know if it is allowing blowby under load or if it is preventing blowby at idle or low load but either way it could impact oil consumption.

If blowby is prevented at idle or no/low load it could result in excessive crankcase pressure forcing oil around the rings and burning it. And on the opposite end of the problem is the pcv allowing blowby under load or WOT in this scenario I suspect oil would be vacuumed up from the crank and consumed. I think if the latter were the case then a simple inspection of the lower might show puddles of oil but then the question is what to do with the pcv?

 

FOO_G,

Just by changing the exhaust system? This member had the original intake with no other mods.

 

also as far as I can tell there is no onboard sensor to monitor the pcv valve.

 

the pcv valve is accutaed by vacuum pressure. I would think the chang in exhaust pressure could change the vacumm in the intake. since the engine is really only pumping air less resistance to the pump means more through the pump.

 

Would like to here from any other Fast Intension test pipes/exhaust owners to see if they are having any problems

 

You guys are almost on the right track.

We are actually looking into the phenomenon ourselves. It looks to be an issue that may only may be in the 05+ models, from my research thus far.

From what we are seeing it may have a direct relation to not having enough backpressure, thus relieving crankcase pressure causing the blow-bye - giving a negative vacuum pressure - thus sucking the oil out.

It's just about the only thing we can think of...and it would be the result all testpipes would have as well.

One thing noticed - when non-foulers were put in - the consumption dropped to 1/2 - so there is a tie-in somewhere with the O2 sensors and the computer modifying something as well, that is not helping the situation out.

The problem also seems to persist, though at a much lower level, with Crawford and other cats as well. You don't see the oil on the car because the CAT burns it up.

Rick

 

maybe it is just a matter of the plug being raised due tot he non-fouler. were you able to do dyno b4 and after the nonfouler install?

 

A dyno of before and after the non-fouler isn't going to show anything for relevance in this case - it wont pickup oil. The O2 sensor will foul out/CEL because of the added gases not being burned with the removal of the CATS..simple - and the ECU then accommodates.

A dyno isn't going to show anything - other than sniffing for Air/Fuel - and richness/leanness does not change. That I know from my own experiences. I dyno'd with and without the foulers with no changes - but not for a 'fouler' test, for other mods. I just happened to install the foulers in between.

Rick

 

I am curious about AF /o2 sensor voltage read out most folkls usually only get this data when dynoing but if you have a well equiped scantool you can get the same.

Wouldn't it read ric if it is burning oil since it is a fuel source?

 

No..the O2 sensor is not getting soaked - the oil vapor is so thin and hot at that point, and traveling fast enough, it passes right by. The O2 sensor just fouls out and throws the CEL.

I looked at that when my car threw the CEL at a dyno, which prompted me to put on the non-foulers. I never had the issue of the CEL on my car until the Apexi unit was put in and the car was de-leaned.

Rick

 

hmm I see from you sig yo have a 05.Are yu seeing oil consumption? I was speculating with someone else that maybe with a plenum spacer it would happen as much since the stregth of the vacuum would change due to the volume of air changing in the plenum.

 

Hey Rick doyou recall what code the ecu logged when you got the cel?

 

Never looked - didn't care - I knew why it was there - NO CATS!