Non cat exhaust - help required
Discussion
I've got manifold and Y piece with no cats and want to swap the existing system. What will I need - ie exhaust gaskets (which type), new bolts (which type), what do I do with the lambda's (no holes in non cat manifolds), do I need to rub down the heads (with what), will I need to reset anything and anything else I can't think of.
FFG
FFG
Most of the Griff community know you've got more money than sense... oops, I'll start that again.
Most of the Griff community know you had the good sense to buy the better model, a 4.3 pre-cat... oh damn, again..
Some of us know you have 2 Griffiths Paul, a 4.3 and a 500, which one are you talking about here?
Most of the Griff community know you had the good sense to buy the better model, a 4.3 pre-cat... oh damn, again..
Some of us know you have 2 Griffiths Paul, a 4.3 and a 500, which one are you talking about here?
If you have a car which is currently running with lambda sensors, and you are fitting an exhaust which doesn't have anywhere for the lambda sensors to go, then you need to disconnect the lambda sensors and remove them from the car, and convert the ECU to run open loop. This means replacing the cat tune resister with a non-cat one. If the non-cat map in your ECU has been set up to suit your engine, then that's all there is to it. If it hasn't then you need to obtain a chip with the right non-cat map for your engine. Most likely you'll find the existing non-cat map is right, but if you have any running problems afterwards bear in mind that it *may* not be right.
Edited by GreenV8S on Friday 25th August 18:32
barreti said:
Most of the Griff community know you've got more money than sense... oops, I'll start that again.
Most of the Griff community know you had the good sense to buy the better model, a 4.3 pre-cat... oh damn, again..
Some of us know you have 2 Griffiths Paul, a 4.3 and a 500, which one are you talking about here?
Most of the Griff community know you had the good sense to buy the better model, a 4.3 pre-cat... oh damn, again..
Some of us know you have 2 Griffiths Paul, a 4.3 and a 500, which one are you talking about here?
It's the 500. The exhaust was fitted to the 4.3 but now it's got ACT manifolds and it came with the purchase of the 4.3. Seems a waste to just leave it lying around. Got a pre cat tune resistor already.
FFG
If its any help FFG, these are the bits I've got for my 4.3 so I can swap the existing manifolds for a pair of Stainless ones.
ARP bolts and a new set of head/manifold gaskets from TVRCarparts
Copaslip for the bolts
New plugs and extenders because I might as well do them while I am in there.
New engine mounts because the manifolds need to be off to do them.
I'm told the 8 bolt flange is difficult to get gaskets for so sealant is generally used instead.
I've no idea what sealant yet, but I'm fairly sure I could use the same stuff I got for attaching the bonnet heatshield - Evostick Fireseal. If I find something more suitable I'll let you know.
ARP bolts and a new set of head/manifold gaskets from TVRCarparts
Copaslip for the bolts
New plugs and extenders because I might as well do them while I am in there.
New engine mounts because the manifolds need to be off to do them.
I'm told the 8 bolt flange is difficult to get gaskets for so sealant is generally used instead.
I've no idea what sealant yet, but I'm fairly sure I could use the same stuff I got for attaching the bonnet heatshield - Evostick Fireseal. If I find something more suitable I'll let you know.
I'm sure i've read in the distant past that there are different manifold gaskets - standard and better than standard - which ones are recommended as I only want to do the job once.
8 bolt flange?? What the fook is that?
Which ARP bolts did you get? Aren't there ones with different heads - obviously the easier to fit the better.
I use sh1tloads of copperslip anyway so no issue with that.
FFG
8 bolt flange?? What the fook is that?
Which ARP bolts did you get? Aren't there ones with different heads - obviously the easier to fit the better.
I use sh1tloads of copperslip anyway so no issue with that.
FFG
FlipFlopGriff said:
I'm sure i've read in the distant past that there are different manifold gaskets - standard and better than standard - which ones are recommended as I only want to do the job once.
8 bolt flange?? What the fook is that?
Which ARP bolts did you get? Aren't there ones with different heads - obviously the easier to fit the better.
I use sh1tloads of copperslip anyway so no issue with that.
FFG
8 bolt flange?? What the fook is that?
Which ARP bolts did you get? Aren't there ones with different heads - obviously the easier to fit the better.
I use sh1tloads of copperslip anyway so no issue with that.
FFG
Gaskets and ARP bolts were ordered from TVRCarparts - I just called them and told them what I wanted. There is a thread somewhere else on here about the ARP bolts and I think the part number is on a picture on the thread. I'm pretty sure they have something like 3/8 heads but its all obvious if you find the thread.
The 8 bolt flange is the connection between the manifolds and the y piece. That big ugly pair of things above the front crossmember that look like they belong on a ship.
Anybody need a pair of 8 hole manifold to 'Y' piece gaskets for pre-cat Griff?
Having tried to source some from every TVR outfit in the country including Tom and Gerry and TVR themselves to no avail, i am now having some made out of better and safer material. The original stuff is asbestos!
If anybody is interested they are £6.50 each. I also have Victor Reinz racing quality manifold to head gaskets at £3.50 each. (Two required for each bank).
The £6.50 price is based on a minimum order of 10 so that will need 5 interested parties.
Having tried to source some from every TVR outfit in the country including Tom and Gerry and TVR themselves to no avail, i am now having some made out of better and safer material. The original stuff is asbestos!
If anybody is interested they are £6.50 each. I also have Victor Reinz racing quality manifold to head gaskets at £3.50 each. (Two required for each bank).
The £6.50 price is based on a minimum order of 10 so that will need 5 interested parties.
Edited by Aaron C. Reskew on Wednesday 27th September 22:43
Edited by Aaron C. Reskew on Saturday 30th September 18:18
Hi there
So which manifold gaskets are supposed to be the best? I´ve seen at least 3 different types and i think my car is blowing at the moment. One type looks like "cardboard" and is 1 to every 2 cylinders, the other is cardboard encased in perforated aluminumfoil (composite?) 1 to every cylinder and the third is made of a sheet of metal 1 to every 2 cylinders. I still have aset of the second variant but dont want to use them if they are no good. Thanks for any oppinions.
Cheers Jens
So which manifold gaskets are supposed to be the best? I´ve seen at least 3 different types and i think my car is blowing at the moment. One type looks like "cardboard" and is 1 to every 2 cylinders, the other is cardboard encased in perforated aluminumfoil (composite?) 1 to every cylinder and the third is made of a sheet of metal 1 to every 2 cylinders. I still have aset of the second variant but dont want to use them if they are no good. Thanks for any oppinions.
Cheers Jens
Have only used one type without any come backs, which are not supplied or fitted by TVR.
The steel ones may not mould to the shape of the manifold flange, particularly if the surface is not ground flat to get rid of the extensive rust build up and subsequent loss of manifold mating surface.
Don't leave the manifolds blowing for long , or damage will be caused to the aluminium head, plus you will be loosing power.
The steel ones may not mould to the shape of the manifold flange, particularly if the surface is not ground flat to get rid of the extensive rust build up and subsequent loss of manifold mating surface.
Don't leave the manifolds blowing for long , or damage will be caused to the aluminium head, plus you will be loosing power.
Edited by Aaron C. Reskew on Wednesday 27th September 22:53
So does that mean the ones which are like a letter g (only that would be in any old font not this new stuff, you know, a round top and a round bottom joined by a line) and you need two per side are better then?
I've got some of them ready for when I fit the new SS manifolds, that will be a relief if I've got the better ones first time for a change.
Sorry about the waffle in brackets above, got a bit carried away
I've got some of them ready for when I fit the new SS manifolds, that will be a relief if I've got the better ones first time for a change.
Sorry about the waffle in brackets above, got a bit carried away
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