Issue with Exhaust - It STINKS Literally - Page 3 - Defender Source
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  #41  
Old January 19th, 2007, 04:18 PM
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On other business I was speaking with Mark Adams and I aksed him about this post. He and I looked at some tunes and such and here is the scoop from the guru.

NAS D90 (1994-1995) have a tune resistor. It is a 3900, but it is made into the harness about 2 feet from the ECU plug, gray/black wires. You can not see it unless you open up the harness (unlike older RRs where it is exposed).

Removing the cats has no concern for the tune or the ECU. His dyno tests show no issue with air flow, back pressure, etc. Yes, your exhaust will now stink, you can't do much about it.

So to remove your cats you need change nothing, nor will you gain anything if you do change ECU parts.

Even if you swap to a Euro spec tune and a 470 tune resistor the hydrocarbons out the tail pipe will still stink badly.

The benefit of a Euro tune and a 470 tune resistor is a little leaner running and better MPG as it removes the readiing from the 02 sensors.

Straight from Marks' mouth.
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  #42  
Old January 23rd, 2007, 07:09 AM
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So basically the answer is to put the cats back on... That sucks.
Brian
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  #43  
Old January 23rd, 2007, 08:01 AM
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What is the benefit of taking the cats off anyway??
With todays performance cats you won't see hardly any decrease in performance by running them, and if you keep the same size stock exhaust and just take out the cats I bet you would pick up next to nothing in performance. A new air filter or some timing advance would probably would give you better gains and no hassles.

Hydrocarbons stink, and if you let more flow out the pipe... its gonna stink.

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  #44  
Old January 23rd, 2007, 08:50 AM
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I don't disagree with you- I just wish I didn't cut mine off now!
Thanks for the input
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