I read about a guy that removed his catalytic converter and egr and said it really helped with performance. I know those are required in some areas but if those items were removed how much would it help performance? Would it create other problems? How about a K&N air filter? Other things similar to that?
The rover I'm getting will be mainly for off road with an occasional road trim to get to the mountains.
Thanks,

 

It was probably a diesel. I don't think the V8's have EGR. Removing the cat's on a diesel would decrease exhaust gas temps, and also make the turbo spin up faster.

 

You are probably right on the diesel.
What would happen if the cat was removed on a gas engine?

 

On a North American Spec D2, you'd set the check engine light on, because the rear o2 sensor would detect that your cat wasn't working. There are ways around that... perhaps...

 

What are the ways around setting off O2 lights? Where I live the disco wouldn't need to pass emmissions

 

It's a good question. I am not subject to smog testing but I have a vehicle burdened with California specifications. I am not interested in "performance," but I am concerned about the catalytic converters failing (becoming clogged) with time. I have had this happen on other very low value vehicles and the solution was to hollow out the cats. For a higher value vehicle it's not ideal, but buying new cats isn't either. Those previous vehicles on which I hollowed out the cats were carburetted. In another case I had a full race exhaust, but the old closed loop FI motor on that one was completely changed out.

So the question that remains is how will the FI on the Rover V8 respond to missing catalyst or no converters. If I'm not mistaken, the only sensor they have in that part of the loop is the O2. How will the O2 sensor respond and what will be the changes on the FI?

 

It is illegal in the US to remove cats off a vehicle that came from the facory with cats.
That being said, if you google something called an O2 sensor simulator, alot of your questions will be answered. It will replicate the results of an O2 sensor. Still recommended to hollow out the cats though. Alot of guys in the Honda world run em. It will keep your truck in closed loop from startup, which, generally isnt good on a cold motor. Once warmed up, it will run like a bat out of hell, but you may have cold start problems.

As far as removing your EGR to help performance, it will. The trade-off is your already dismal fuel economy will nosedive even further at higway speeds.

but you didnt get this information from me.

 

YouTube - ‪I See Nothing - Sgt Schultz‬‏

 

exactly

 

The LR V8 does NOT have a EGR.
Why hollow out your cats when you can just weld in a piece of straight pipe?
New universal cats are $80 each.
When you replace your cats if you take your old ones to the scrap yard you will get enough money for them to pay for your new ones.
Cats are full of precious metal and Fancy Feast.