Pre Cat Removal - Should I / Shouldn't I
Discussion
I had the pre-cats removed this week at Austec, whilst the car was in for a new cam. It was already 'de-sleeved' and sounds fantastic! I would definately recommend it to anyone!! Also some reckon you need 'non-reversal cones' fitted if the pre-cats are removed (something to do with back-pressure), but spoke with Paul and he said they added no real benefit and so I didn't need to bother! Result!!
This socket does the trick:
www.tooled-up.com/Product.asp?PID=123278
Pull off the plastic protector, grind or cut a slot down it for the wire and bob's your uncle.
www.tooled-up.com/Product.asp?PID=123278
Pull off the plastic protector, grind or cut a slot down it for the wire and bob's your uncle.
David H said:
This socket does the trick:
www.tooled-up.com/Product.asp?PID=123278
Pull off the plastic protector, grind or cut a slot down it for the wire and bob's your uncle.
Does it actually fit? It looks quite fat.
crazycraig said:As i said,both of mine were done this way,so thats four pre-cats.Mine were also the metalic type like yours,so i see no problems,with a little care and patience.Go for it!you'll be glad you did
Worst case scenario, if I can't get the lamdas out, will they be robust enough if I was to start on the cats will a hammer/drill bit, Mongoose seems confident, but should I ?????
Lambda sensors are quite vulnerable to contamination, and since you've got the thick end of two hundred quids worth of sensor there (plus the grief of figuring out what is wrong when they start playing up and getting them replaced) I think it's a no-brainer to get them out of the way first.
David H said:
This socket does the trick:
www.tooled-up.com/Product.asp?PID=123278
Pull off the plastic protector, grind or cut a slot down it for the wire and bob's your uncle.
Or try this one - www.ccw-tools.co.uk/catalogue/product.asp?prod_id=5233&cat_id=81 from these people.
Come highly recommended, especially from me as I've bought most of my tools from them and 30% cheaper.
I order most things before 3 and have it on standard delivery and still get woke up by posty the next morning banging on the door at 0730hrs.
Shouldn't moan, at least they deliver prompt. As for the heat, I've spoke with a few people today on this subject and they all mention how the heat doesn't drop in the sense, it just moves more forward from the manifolds towards the main cat, which in turn can have effect on the main cat by breaking it down quicker and at worst, cause it to come free and drop to the bottom of the dustbin (housing) that it's in.
>> Edited by crazycraig on Friday 16th December 16:06
GreenV8S said:
This socket does the trick:
www.tooled-up.com/Product.asp?PID=123278
Pull off the plastic protector, grind or cut a slot down it for the wire and bob's your uncle.
Does it actually fit? It looks quite fat.
Yep, it fits fine.
Thanks everyone.
Just to keep you all upto date, spoke with Shaune at V8 Developments (great guy, very helpful) and explained about the thread and the issue with the gaskets and how they were the same size as the head and manifold.
For a moment I thought I'd opened up a can of worms when he told me he thought that the gaskets that I have (part no ERR6733) were for a smaller V8 lump and wouldn't fit a 5 ltr worked head, (unless I've got a different head and manifold) but he'd never came across it yet.
So as the nice chap that he is, he clicked onto everyones fav site, and checked out the photos and could tell instantly that I had the correct head and that if the gasket opening is the same size as the opening on heads then they would be suitable.
Once again, the power of Pistonheads comes up trumps.
Craig
Just to keep you all upto date, spoke with Shaune at V8 Developments (great guy, very helpful) and explained about the thread and the issue with the gaskets and how they were the same size as the head and manifold.
For a moment I thought I'd opened up a can of worms when he told me he thought that the gaskets that I have (part no ERR6733) were for a smaller V8 lump and wouldn't fit a 5 ltr worked head, (unless I've got a different head and manifold) but he'd never came across it yet.
So as the nice chap that he is, he clicked onto everyones fav site, and checked out the photos and could tell instantly that I had the correct head and that if the gasket opening is the same size as the opening on heads then they would be suitable.
Once again, the power of Pistonheads comes up trumps.
Craig
Quinny said:
The only downside for me is that it does tend to produce a 'icking' - I even had the car back into the garage to make sure it wasn't the EMGs again...
It's a lot like a ticking, but without the essential 't'...
On the subject of manifolds I'm doing Ceramic coated jobbies on an exchange basis so while you've got them off get them blinged up 
I'm taking 4 sets into Camcoat on Monday, I don't expect them to be ready till after the new year though.
I'm getting them done with cermachrome (shiny silver) unles popular opinion says white grey or black watchereckon
OZ
I'm taking 4 sets into Camcoat on Monday, I don't expect them to be ready till after the new year though. I'm getting them done with cermachrome (shiny silver) unles popular opinion says white grey or black watchereckon
OZ
Hi folks,
Noticed this thread with interest as I have just finished taking my pre-cats out today.
First one was loose and came out easily after a little help, second fighter was well stuck, put a hole throught the middle (with the help of a crow bar!), fettled it for a while
then out it came.
Just a word of warning though, after removing the first cat on Thursday evening (in my garage) I ended up with a rash over my hands/neck, took some piriton and it went away. Today I removed the 2nd cat outside, wearing a mask and made sure that my skin did not come into contact with the stuff.
I also intend to remove the dustbin cat in the y piece (unless I can find a donor for the right money), let me know if you have a spare one hanging about.
Has anyone on here run with no cats and straight thru pipes on a chim? Just wondered what the volume wuld be like before I get the angle grinder to my Y piece.
has anyone thoughts about loss of back pressure/bhp/torque, cos it would appear that the effects of cat removal alter with the weather, mine was a 4.3 with straight through pipes prior to taking the body off.
Steve.G.
p.s. I took lamder sensors out before starting on this.
Noticed this thread with interest as I have just finished taking my pre-cats out today.
First one was loose and came out easily after a little help, second fighter was well stuck, put a hole throught the middle (with the help of a crow bar!), fettled it for a while
then out it came. Just a word of warning though, after removing the first cat on Thursday evening (in my garage) I ended up with a rash over my hands/neck, took some piriton and it went away. Today I removed the 2nd cat outside, wearing a mask and made sure that my skin did not come into contact with the stuff.
I also intend to remove the dustbin cat in the y piece (unless I can find a donor for the right money), let me know if you have a spare one hanging about.
Has anyone on here run with no cats and straight thru pipes on a chim? Just wondered what the volume wuld be like before I get the angle grinder to my Y piece.
has anyone thoughts about loss of back pressure/bhp/torque, cos it would appear that the effects of cat removal alter with the weather, mine was a 4.3 with straight through pipes prior to taking the body off.
Steve.G.
p.s. I took lamder sensors out before starting on this.
schimg said:
Hi folks,
Noticed this thread with interest as I have just finished taking my pre-cats out today.
First one was loose and came out easily after a little help, second fighter was well stuck, put a hole throught the middle (with the help of a crow bar!), fettled it for a while
Just a word of warning though, after removing the first cat on Thursday evening (in my garage) I ended up with a rash over my hands/neck, took some piriton and it went away. Today I removed the 2nd cat outside, wearing a mask and made sure that my skin did not come into contact with the stuff.
I also intend to remove the dustbin cat in the y piece (unless I can find a donor for the right money), let me know if you have a spare one hanging about.
Has anyone on here run with no cats and straight thru pipes on a chim? Just wondered what the volume wuld be like before I get the angle grinder to my Y piece.
has anyone thoughts about loss of back pressure/bhp/torque, cos it would appear that the effects of cat removal alter with the weather, mine was a 4.3 with straight through pipes prior to taking the body off.
Steve.G.
p.s. I took lamder sensors out before starting on this.
What stopped me gooing full de-cat is that I've been told just removing the cat from the 'dustbin' y-piece van sound very hollow and echoey, if you really want to do it properly it may be worth trying to source a de-catted y-piece with a much smaller dustbin piece.
GreenV8S said:
I'm doing Ceramic coated jobbies on an exchange basis
Where do we go to find prices for this?
They will be on my website early in the new year.b price will be £310 your donor manifolds will need to be in perfect condition ie no cracks, thin bits or dents that can't be removed
www.tvrparts.net
I'm doing a similar service with refurbished wheels (see adverts in classified)
OZ
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