| Author |
Message |
    
hendrik
| | Posted on Thursday, August 15, 2002 - 06:39 am: | 
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Howdy,
I wonder if the cat (thinking of the RH one) has a double skin. Or is the ceramic core directly underneath the casing ? (some of you I think removed the core, so might know).
Until I´ve gathered enough money to buy a proper replacement cat/front exhaust section I need to modify the right cat to make it slimmer in the area where my new double cardan driveshaft hits it. Shortly behind the offensive area there is a deep notch on both sides (almost 1cm deep, just the space I need) which is resticting the gas flow anyway. |
perroneford
| | Posted on Thursday, August 15, 2002 - 08:57 am: |
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The universal cats are MUCH cheaper and often quite a bit smaller as well. I was able to source mine for US$49.99 and it was a fair bit smaller than the original. About 2/3 or less the size in fact.
-P |
Rob Davison (Pokerob)
| | Posted on Thursday, August 15, 2002 - 10:25 am: |
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did this aeffect the o2 sensort at all , i am in the middle of piecing togethere a new exhaust from the manifold down, i found a british site that sells all the pieces without cats, so i can weld them, but i am concerned about the o2 senssor, can i just eliminate it or will it cause problems?
rd
'89 RR |
hendrik
| | Posted on Thursday, August 15, 2002 - 11:39 am: |
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RD: The ECU will need the sensors to adjust the fuel/air mixture correctly. Without it will run rich and give a one-digit-mpg 
I think that the Lambda sonds have a M18x1.5 thread. If you get a nut in that size (stainless-steel) or re-use the ones from the old exhaust then the problem could be solved.
Perrone, my problem is that I do not live in the US. The dealers over here want 200-300$ for a high-flow (metal-core instead of ceramic) cat. But I have a friend in Seattle. Can you give me the part# and the adress of the dealer, please. Maybe my friend can order them and send them here.  And do you have the data how wide/long/high your cat is. (a website perhaps ?)
Meanwhile I will have to modify the existing one, I´m afraid. |
perroneford
| | Posted on Thursday, August 15, 2002 - 11:54 am: |
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hendrik,
I don't live in the UK, but that doesn't stop me ordering parts from Mansfield Motors and Craddocks! Companies today really have little trouble with shipping across the pond.
I bought my Catalytic converters from Summit Racing (www.summitracing.com) but there are a great many sources for them here.
For more info, you can read my article on this stuff on our club web page:
http://www.spanishtrailrovers.com/Tech/Mods/Exhaust_Upgrade/exhaust_upgrade.html
Best of luck,
-P |
Rob Davison (Pokerob)
| | Posted on Thursday, August 15, 2002 - 12:23 pm: |
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as i suspected, thanks henry
i'll have to make it a point to make sure and get pipes with the o2 sensor treads in the pipe already
rd |
JB
| | Posted on Thursday, August 15, 2002 - 12:30 pm: |
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Can't you tune it to run a better mix without O2 sensors ?? |
hendrik
| | Posted on Thursday, August 15, 2002 - 01:13 pm: |
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Rob, I forgot:
I think there are different setups for the front Y-piece. The EFi have a 4-2 manifold without and a 4-(2)-1 one with cat - the latter has two outputs at the flange. The stainless steel section probably are the double downpipes which make putting a cat into it impossible. (I could mail you the relevant page from the parts-manual if you don´t have it). The older type (3.5carb) has a different manifold with a 4-1 downpipe - that could be a start.
That´s why I didn´t order a Y-Piece in s/s to weld cats into it and try to modify the old pipes. I don´t have old manifolds to convert to and no ambitions to do so. |
Rob Davison (Pokerob)
| | Posted on Thursday, August 15, 2002 - 02:41 pm: |
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I am, emailing the guy in england we figured the gasket from the manifold to the y pipes are the same on 3.5 v 3.9 so we concluded the pipe will fit, he is going to take pictures and email me tonight.
rd |
Rob Davison (Pokerob)
| | Posted on Thursday, August 15, 2002 - 02:44 pm: |
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http://dls-uk.co.uk/Rrover%20exhaust%20list.htm
if i can get it to work i'll save large cash.
rd |
hendrik
| | Posted on Friday, August 16, 2002 - 03:51 pm: |
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yes, 3.5 and 3.9 EFi-s have the same downpipes.
Suppliers like DLS offer "cat-back" systems of cat verhicles or the Y-piece from non-cat verhicles. These are the "double" pipes on each bank on the EFi systems (as shown on your link). The pre-Efi-exhausts have a "one-pipe"-Y-piece that makes it possible to cut a piece out of it and put the cat in between, but this Y-piece has a different gasket (just one hole) I think.
But if you will post (please do) when you got the right s/s front exhaust section and succeeded in you plans I might follow your route. Definately. |
Rob Davison (Pokerob)
| | Posted on Friday, August 16, 2002 - 04:25 pm: |
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will keep you posted!
rd |
hendrik
| | Posted on Saturday, August 17, 2002 - 03:32 am: |
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BTW: RRC - EFi systems from MY90 on (?) may feature a tune resistor that can be changed and tells the ECU that it deals with a Range with or w/o cat.
(Would have to see the parts manual to be sure). |
Rob Davison (Pokerob)
| | Posted on Saturday, August 17, 2002 - 12:03 pm: |
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this first one is NTC1863
this second one is NTC1864
i'm not sure whats up with this double piped action, but i have a parts manual here and i'm going to cross reference those numbers and see what i find. for the price i might try it anyway.
rd |
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