Performance from evironmentally unfriendly d-90 - Defender Source
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  #1  
Old September 23rd, 2010, 02:24 PM
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Stephan Laputka
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Performance from evironmentally unfriendly d-90

I was wondering what was in our cars (NAS D-90) that inhibits performance for the purposes of passing emissions. If those things were removed (theoretically of course) what would they be and what would the performance gains be if any. Cats, charcoal canister... what else?
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  #2  
Old September 23rd, 2010, 02:42 PM
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Cats and that is about it. Charcoal canister does not inhibit performance.
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  #3  
Old September 23rd, 2010, 03:03 PM
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Neil McCauley
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Wonder what would happen if we plumbed in Nitrous.
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  #4  
Old September 23rd, 2010, 03:31 PM
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Stephan Laputka
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would popping out the cats make a noticeable difference?

Did in my race car...

------ Follow up post added September 23rd, 2010 04:15 PM ------

Basically i'm trying to figure out if the performance benefit is worth the extra cost of "passing" inspection with the cats removed
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  #5  
Old September 24th, 2010, 09:17 AM
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Ive never seen the cats on a modern rover but, if they are anything like cat is hondas or BMWs they can just be cored.

If you arent worried about passing an actual emissions test but you dont wan to be harrased for not having cats you can remove your exhaust and drill out the cats innner section. THen break it all up and push it out with a broom stick.

Bingo free flow cats that arent really cats.


Or you can buy high performace ceramic cats from a company like magnaflow. My 96 F150 has a 351ci V8, with the stock 2 cat setup it was a tad sluggish. I cut out the original stock cats (140k) and replaced them with a single high flow cermaic magnaflow. It sounded much better, there was a noticeable increase on the butt dyno and it still passed NJ emissions inspection without issues. Also no check engine light.

http://www.magnaflow.com/02catalytic...versal/530.asp
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  #6  
Old September 24th, 2010, 09:31 AM
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Greg Liebig
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Quote:
Originally Posted by Neil McCauley View Post
Wonder what would happen if we plumbed in Nitrous.

What's the best rpm to launch my D90?
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  #7  
Old September 24th, 2010, 10:14 AM
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Cored cats..... f'n bastards.

Cost me a lot of time and money to get my truck to pass emission testing here because the previous owner cored them, and it took forever to figure out why. Of course, I didn't find out until right away because the f'n Nissan dealership I bought the truck from did a fraud inspection in the first place and by the time I figured it out it was too late to do anything about it other than buy a whole new Y-pipe with my own cash.

-Hans
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  #8  
Old September 24th, 2010, 10:39 AM
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Gary
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[QUOTE=sflash868;242618]would popping out the cats make a noticeable difference?

Did in my race car...


Are you serious?
This is a joke, right?
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  #9  
Old September 24th, 2010, 12:21 PM
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Quote:
Originally Posted by gliebig View Post
What's the best rpm to launch my D90?
from the fuel cut
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  #10  
Old September 24th, 2010, 03:28 PM
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Quote:
Originally Posted by Hans View Post
Cored cats..... f'n bastards.

Cost me a lot of time and money to get my truck to pass emission testing here because the previous owner cored them, and it took forever to figure out why. Of course, I didn't find out until right away because the f'n Nissan dealership I bought the truck from did a fraud inspection in the first place and by the time I figured it out it was too late to do anything about it other than buy a whole new Y-pipe with my own cash.

-Hans

Yea they can be a pain to diagnose in that sense, the maganflows are prob a better option
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