Do all Pumas have a cat converter??

[Tikka7mm08]

Hi quick question, mine is imported from the UK. Is there an easy way to tell if I have one or simply do they all come with a cat converter.

Having fitted the mid silencer straight through pipe would like to finish it off as it is sounding great and will only sound better/run better.

Was thinking any exhaust shop could make one up as the shipping to NZ is absolutely horrendous.

Thank you

Bob
Defender 90 MY'08 (Darth90).

[Drover]

Yep, pretty sure they all do !

You can check by looking for large round canister in the middle of the exhaust pipe just below the turbo.

[Tikka7mm08]

Righto...will see what a de cat down pipe will cost locally made.

[Tombie]

Option B decat tool
https://www.aulro.com/afvb/images/imported/2014/07/685.jpg

[Tikka7mm08]

...! Would leave edges though and hang the gas up rather than free flow?!

[Tombie]

Best way - if policed is to cut the can off, straight pipe it and weld the can back in :)

[Tikka7mm08]

Yep...not policed here. Apparently hard to remove due to forward crossmember. TMD do a 2 piece replacement to avoid cross member but this about $300 plus postage.

[pannawonica]

Yep...not policed here. Apparently hard to remove due to forward crossmember. TMD do a 2 piece replacement to avoid cross member but this about $300 plus postage.

Yes the crossmember is a problem. However on a hoist it is only four easy bolts and then removed by a FBH. I waited till I was able to do the job, thus I have it to replace if ever needed or as a pattern to make a replacement/s. Also the front prop does need disconnecting at one end.:D

[Tikka7mm08]

Where does disconnecting the prop fit between 1 and 5 spanners for difficulty ;)

[AndyG]

Allisport do a fake Cat.

[pannawonica]

Where does disconnecting the prop fit between 1 and 5 spanners for difficulty ;)
I would not rate disconnecting the prop very hard at all, however I did use a Koken tools special tool. (its like a skinny entension bar) Ok then a 2 spanner rating of difficulty.

[dawsey]

Not being overly mechanically savy..cat converter or no cat does it really affect the engines performance..my 89 zook has 1, so they have been around for awhile.

[Tikka7mm08]

As I understand a cat can act as a restriction...so removing it allows the turbo to spool up faster and better economy...whether or not that is true Im not sure but did notice a better tone and a litle better performance by losing the silencer with a straight thru pipe in its place...

[Toxic_Avenger]

Not being overly mechanically savy..cat converter or no cat does it really affect the engines performance..my 89 zook has 1, so they have been around for awhile.
It's a pollution control device, reduces amount of nitrous oxides in the exhaust (NOx).
They have been fitted to most cars since 1983... so living behind the times much ;-)
Generally frowned upon to remove them, due to emissions issues.


As I understand a cat can act as a restriction...so removing it allows the turbo to spool up faster and better economy...whether or not that is true Im not sure but did notice a better tone and a litle better performance by losing the silencer with a straight thru pipe in its place...

Cats come up to temp before they are effective, so not really working in a pollution control capacity until operating temp. Some cars introduce oxygen into the cats to aid heat up time, to warm the catalyst. Yes they are a restriction, but if we want to split hairs, we'd all be running turbo dump pipes with screamer pipes so we have no restriction at all!
Generally with a turbo system (in petrol at least) you want as little backpressure in the exhaust as possible. Similarly as little intake resistance as possible.

[Defender13]

It is pretty much the same on diesel turbo - less restriction = better response.
I would be interested if somebody, who used the bypass (kit or otherwise) and at the same time has ECU remapped, did any particular changes to programme where the fuel trim is controlled? I am assuming they replace the sensor back when bypass is created. Or, is it negligible at all? I have never considered that option before - no need really, just being curious.
Cheers.

[Dougal]

Performance difference will not be noticeable. The factory engineers make sure the cat isn't a bottleneck.

[BilboBoggles]

I seem to recall that having too little restriction might also be an issue, because it might allow the turbine blades to overspeed under certain conditions. I don't know what issue that causes, but I'd imagine production model turbos are designed to specific flow rates etc...

[pannawonica]

Performance difference will not be noticeable. The factory engineers make sure the cat isn't a bottleneck.

As I have done my mods progressively I would disagree. The cat is quite a restriction and does cause heat build up in the cylinder head whilst restricting exhaust gases. A decat will allow the engine to run cooler and the turbo to spool up noticeably quicker. I found that if did a lot of short journeys the motor would become sluggish, however after a 50/100 k run performance would be restored.I attribute this to the cat becoming coked up. Factory engineers are in my opinion are more interested in obtaining type approval.:D

[pannawonica]

I seem to recall that having too little restriction might also be an issue, because it might allow the turbine blades to overspeed under certain conditions. I don't know what issue that causes, but I'd imagine production model turbos are designed to specific flow rates etc...

Gary at Alive tuning advised me to retain the standard back box for that very reason, stating that it was a common reason for turbo failure ( over speed ) .:D

[Toxic_Avenger]

As I have done my mods progressively I would disagree. The cat is quite a restriction and does cause heat build up in the cylinder head whilst restricting exhaust gases. A decat will allow the engine to run cooler and the turbo to spool up noticeably quicker. I found that if did a lot of short journeys the motor would become sluggish, however after a 50/100 k run performance would be restored.I attribute this to the cat becoming coked up. Factory engineers are in my opinion are more interested in obtaining type approval.:D

Cats are matched for engine flow. The idea is to provide at least some restrictuion to give the catalyst time to work its magic on the exhaust gases.
I was ordered by the 'EPA' to put a standard cat convertor on my motor vehicle... even though I had a Euro 3 spec cat on a car which was manufactured well before the 'Euro' spec was devised.
The idea is that if you have a 'high flow' 1000cpsi Cat, its doing seven tenths of **** all to the emissions. Likewise if you run a 'higher' spec cat on an older engine, you will still need to get that particular installation approved for road use by taking it over the RTA's emissions dyno.
Currently my Nissan 300zx 'fast car' is running cats off a V8 landcruiser. if its good for 4.5l of flow, it's good for 3.0l at 14psi (equivalent to 6L flow at max boost)

[Dougal]

As I have done my mods progressively I would disagree. The cat is quite a restriction and does cause heat build up in the cylinder head whilst restricting exhaust gases. A decat will allow the engine to run cooler and the turbo to spool up noticeably quicker. I found that if did a lot of short journeys the motor would become sluggish, however after a 50/100 k run performance would be restored.I attribute this to the cat becoming coked up. Factory engineers are in my opinion are more interested in obtaining type approval.:D

Short journeys isn't the cat plugging up. It's everything plugging up. Including your turbo vanes.

A decat won't help as diesels without a cat have the same problem.

[abbztract]

Hi quick question, mine is imported from the UK. Is there an easy way to tell if I have one or simply do they all come with a cat converter.

Having fitted the mid silencer straight through pipe would like to finish it off as it is sounding great and will only sound better/run better.

Was thinking any exhaust shop could make one up as the shipping to NZ is absolutely horrendous.

Thank you

Bob
Defender 90 MY'08 (Darth90).

Hey, Bob.

Hope things are well.

I found this post and saw you trying this is a few years back and I’m trying this again in Aus.

I’m trying to work out what the differences are between the Defenders sold in Aus and UK in terms of specs and compliance related things.

Could you do me a massive favour and maybe share your PUMA vin with me? I just want to use VIN Decoder (or similar website) and see what the diffidence is between the UK models and AUS models. Thats the only way I’ll know if I can get a UK one here. I wouldn’t ask but the local LR HQ asked me to tell them what exact car I’m getting and idk yet because I can’t work out what the difference is and thus can’t tell if the one’s I’m looking at in the UK are compliant.

I’d really really appreciate it if you could help.

Abs.

[Tikka7mm08]

Hey, Bob.

Hope things are well.

I found this post and saw you trying this is a few years back and I’m trying this again in Aus.

I’m trying to work out what the differences are between the Defenders sold in Aus and UK in terms of specs and compliance related things.

Could you do me a massive favour and maybe share your PUMA vin with me? I just want to use VIN Decoder (or similar website) and see what the diffidence is between the UK models and AUS models. Thats the only way I’ll know if I can get a UK one here. I wouldn’t ask but the local LR HQ asked me to tell them what exact car I’m getting and idk yet because I can’t work out what the difference is and thus can’t tell if the one’s I’m looking at in the UK are compliant.

I’d really really appreciate it if you could help.

Abs.


PM sent. Keen to hear what you find.