Has Anyone Done An Engine Conversion In A Gti With A Cat?

[monkee87 2]

I've got an L reg GTi and i was thinking about doing a GTi6 conversion. How do you get past the emissions test as the MOTer will test it for a catalytic converter surely as it'll be listed as having one..?

Has anyone done a conversion in a late car? Do you just try and blag it as a non cat car? I know that if i do the 6 conversion it won't have a cat on it..

 

Does that make sense to any of you?

[Henry Yorke 269 3 Cars]

My L plate CTI needs a cat for the emissions. Yours will too with a GTI6 engine as both the car and new engine came with cat

[Daviewonder 533 3 Cars]

Just fit a cat when you do the conversion, simple

[blue_haddock 2]

find a friendly MOT tester.

 

Simples!

[shalmaneser 26]

I've got an L reg GTi and i was thinking about doing a GTi6 conversion. How do you get past the emissions test as the MOTer will test it for a catalytic converter surely as it'll be listed as having one..?

Has anyone done a conversion in a late car? Do you just try and blag it as a non cat car? I know that if i do the 6 conversion it won't have a cat on it..

 

Does that make sense to any of you?

 

Caveat: I've not done one myself...

 

But, how can it be much harder than a 'non cat' conversion? You're still running a lambda sensor for the ECU anyway, it's just a question of plumbing the cat into the exhaust system. Bit more of a PITA there but not insurmountable by any means if you're willing to have a crack at an engine convo!

[monkee87 2]

My L plate CTI needs a cat for the emissions. Yours will too with a GTI6 engine as both the car and new engine came with cat

 

Do you leave your CAT on all the time then henry? Doesn't it not take power away? I know the 6 lump comes with a CAT, so when you put it in a 205 without the CAT, doesn't it give it more power as it's got less restriction?

I'm sure i could possibly blag it as a non CAT car thought as the guy who MOT's my car is an acquaintance of mine.

[Miles 331 1 Cars]

It's easy to fit a CAT to the 6 engine in the 205, either weld the 306 CAT in or use a aftermarket one of suitable size.

Yes you could try and fool the odd MOT tester but if they have there head screwed on they will know your trying one on.

I;ve never seen any real results from De-cating a 306 so I cannot see it making a huge differance anyway

[Henry Yorke 269 3 Cars]

I leave my cat on all the time. Yes I could get a little bit more power without it but it does save a load of hassle come MOT time.

[monkee87 2]

Thanks for all the replies guys. I don't mind having a CAT on the car, just wondered what others had done.

 

I may be on the look out for a GTi6 engine soon then. Miles, do you do discount on modified engine looms and exhaust manifolds to members?

[Miles 331 1 Cars]

Looms are really done to suit each car as I route them in under the expansion bottle and without making the hole larger you cannot get the brown multi plugs thru the bulkhead, I don;t like using the orginal hole as its too close to the exhaust, even 8v's get hot there.

Manifolds I can sort out, but need yours to mod

[MrG 3]

seems a shame to convert a late car like that, is this the one with the plastic inlet manifold fitted?

 

Can't be many original L reg cars about today. Is it in poor health?

[monkee87 2]

seems a shame to convert a late car like that, is this the one with the plastic inlet manifold fitted?

 

Can't be many original L reg cars about today. Is it in poor health?

 

 

It's only just an L reg, so it doesn't have a plastic inlet manifold. It is running motronic injection though as it has a cat. The whole car is a bit of a mess, it's been owned by a bit of a numpty. I want to take the engine out anyway as the wiring in the bay is a mess... Just considered a conversion as all the gti's I've had have all been original. wanted something a little different really.

[welshpug 1,662]

best do a good job of it then

 

 

I have a query on a similar Subject, a 92 K registered ZX 16v, originally built with a cat as its the RFY engine from the factory, but sold pre-CAT rules which came into force in 93.

 

Its also running a non-original engine, albeit a later one, can this be put through as a non-cat vehicle?

 

I know there were 1.9 non cat ZX's in 92, and a friend had a K-plate Subaru Legacy Turbo that went through MOT'd with the cat removed just fine (no funny business either before you ask!) can I get through with my Decat pipe?

[joe1joe 3]

the emission are done on the "year" so if it has a cat but is pre cat year car then take it off and it should pass fine as the emssions would be tested the same as if a car didnt have a cat???? someone my correct me tho!

[harryskid 193]

the emission are done on the "year" so if it has a cat but is pre cat year car then take it off and it should pass fine as the emssions would be tested the same as if a car didnt have a cat???? someone my correct me tho!

 

I think thats right as well or i hope so!

[Daviewonder 533 3 Cars]

It's only just an L reg, so it doesn't have a plastic inlet manifold. It is running motronic injection though as it has a cat. The whole car is a bit of a mess, it's been owned by a bit of a numpty. I want to take the engine out anyway as the wiring in the bay is a mess... Just considered a conversion as all the gti's I've had have all been original. wanted something a little different really.

 

 

Does the Motronic still use an afm?

[welshpug 1,662]

205 motronic does, same AFM as the 1.9 MI16.

[Daviewonder 533 3 Cars]

Do you think its worthwhile upgrading from jetronic to motronic?

 

(sorry to go off topic monkee)

[Miles 331 1 Cars]

Yes, Night and day differance, It's been covered a few times now but finding the parts is the hardest bit

[welshpug 1,662]

what miles said, the MP3.1 is even better than the 205 Motronic, have a google search

[monkee87 2]

205 motronic does, same AFM as the 1.9 MI16.

 

Really??? My AFM looks identical to the normal jetronic one... ECU deffo has motronic on it though.

[welshpug 1,662]

might well look the same (as does one off a cav, many BMW's, alfa's fiats etc etc.....)

 

Check the part number, IIRC it should end in 202 if its a motronic one, not 056 or 109 which are Jetronic.

[CaptainK 11]

I have a GTi6 fitted into my late model "L" reg 205 1.9 GTi (when original). As said by others a shape to change a late model, but alas the oil pump had died on my original engine and the engine needed replacing. Hence the GTi6. I've got a stainless steel sports / high flowing cat on my car and it flew through the MOT as a standard GTi6.

 

However this years its got throttle bodies on as well and mapped ECU and with the CAT on it still passes - just.

Edited June 29, 2010 by CaptainK