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circusninja Profile
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Date Registered: 10-2013
TOTAL POSTS: 5
Reply | QUOTE
Free Flow compared to Decat exhaust option for a T30


HI guys,

i searched the forum but could not get conclusive input, i would like to know if anyone has done a decat or a free flow exhaust performance modification on a T30 and you results were?

i am looking to do this now but wonder if i should only decat, only free flow or both...

thanks
5/Feb/2015, 1:35 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5975
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Re: Free Flow compared to Decat exhaust option for a T30


You will not find any reference on this forum to decating your Xtrail because it is illegal in Australia and many other countries because of pollution laws.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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5/Feb/2015, 6:19 am Link to this post Send Email PM   Send Private Message Blog
 
CatfishSaone Profile
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Date Registered: 09-2015
Location: Nairobi, Kenya
TOTAL POSTS: 7
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Re: Free Flow compared to Decat exhaust option for a T30


Hi Guys,

ok as I mentioned, I live in Kenya. So rules are really easy going here for modifications. Last month I was in the bush and bend my exaust pipe a bit. It is fixed already and nothing damaged except the cat. Now I am thinking of just decat.

Will this improve the performance? If yes in which way and do I have to reset the ECU. I have a T30 2006.

Thanks!

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Andi K. - X-4348
Nairobi, Kenya - T30 2006
9/Sep/2015, 5:25 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5975
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Re: Free Flow compared to Decat exhaust option for a T30


As I mentioned previously, we are not allowed to do that here in Australia so we will have no information to help you.
All we can say is that the ECU will not like the removal of the CAT because it has oxygen sensors in the exhaust system and if readings are outside expected ranges then it will flag an error and your engine check light will illuminate in the dash.
No-one has been able to reprogram the Nissan ECU either so I don't think there would be a fix for it that way.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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10/Sep/2015, 1:39 pm Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re:


Your best bet for this type of information and the workaround for the ECU detecting a missing cat converter and O2 sensor, is the Sentra Spec-V forum in the US.

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10/Sep/2015, 4:14 pm Link to this post Send Private Message MSN Blog
 
roid Profile
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X-TRAIL NEWBIE
 


Date Registered: 05-2017
TOTAL POSTS: 81
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Re: info for dealing with secondary cat sensor failure (T30 series II)


The lambda (Oxygen) sensor located in the final catalyst (the ‘Beer Can’ converter that hangs down in the middle) can fail just like the catalytic converter it sits behind can. When it does, the error logged by the ECU (and subsequent check engine light). If testIng verifies the catalytic converters are operating normally, the sensor is likely to be faulty. Note: If anyone ever replaces a catalytic converter, they should also replace the o2 sensors at the same time.

A temporary fix for a failed final sensor is to wire a 1M ohm resistor in series along one of the sensor wires, and then bridge a 47uF electrolytic capacitor across to the other signal wire (use a multimeter to test for voltage and ensure the capacitor polarity matches the output from the ECU). Doing this will introduce a simulation of an output of a healthy sensor to the circuit, closely enough to prevent a failure being logged. As the secondary sensor’s purpose is only to warn of catalyst failure, and unlike the first sensor it’s output does not influence the ECU’s combustion analysis, it is certainly suitable as a temporary fix.

It can, of course also be used when the secondary catalyst has been removed from a T30 II, such as on a paddock-basher, where emissions checks are no longer required and where the rear section of the exhaust has been torn off in an off-roading incident, or to otherwise ‘enhance performance‘.

Tip: Be sure to

1. solder the resistor and cap as far from the Sensor as possible, as it gets hot and this heat transfers down the wires. It can melt your soldered joints if too close to the sensor.

2. Take care to use shrink wrap on each wire and then again over both components to prevent water ingress

Last edited by roid, 15/Sep/2020, 6:30 pm


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05 T30 ST-X Auto
205/75x16 A/Ts on 6.5" ET40
200k: Refreshed suspension,fuel, ignition & cooling systems
Often good & dirty as is lifted 35mm on Sachs Automatics & poly bushings
Northern Sydney, NSW
13/Sep/2020, 11:11 am Link to this post Send Email PM   Send Private Message Blog
 


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