E86 Decats?
- Thread starter Kieran_Z4
- Start date
think mike dlv gutted his.. might be worth having a chat with him
By the seaside...
Having been woken a number of times by 'extremely loud cars' driving in a residential area in the early hours, I am hopeful that the new MOT rules will put a stop to a lot of this as an excessively loud exhaust is now an automatic failKieran_Z4 said:Its a full custom straight piped with that cats. ive taken out the foam from the pipes but still not loud enough as i love extremely loud cars coming from the jap scene. i may look at a manifold
Extracted from the new MOT rules
Nuisance (8) (Previously MOT Test of Exhaust and Emissions)
The May 2018 revision of the MOT Testing Manual groups exhaust emissions with noise and fluid emissions under the new heading of ‘Nuisance’.
Noise suppression system
The Tester will inspect: exhaust silencers
Exhaust noise will be assessed during the emissions test for the vehicle or by revving the engine to around 2,500rpm or half the maximum engine speed if this is lower on vehicles not subject to an emissions test
Exhaust noise from the vehicle must not be unreasonably above the noise level normally expected from a similar vehicle with a standard silencer in average condition.
The following categories apply to defects in this section:
Defect (Category)
Exhaust noise levels in excess of those permitted (Major)
The manual says that the testers must 'use your judgement to assess exhaust noise'grumps said:
I extracted the text from a simplified version but you can find the full MOT manual section at https://www.mot-testing.service.gov.uk/documents/manuals/class3457/Section-8-Nuisance.html#section_8.1
mr.tourette said:
I did, however mine is an E85, and they have two sets of cats. The "normal" pair at the manifold, which are monitored by the O2 sensors etc, and a secondary set further down which aren't. I gutted the secondaries, which gave me a massive improvement in throttle response as they were so restrictive, and more "snarl" from my system, which has one of my modded OEM backboxes fitted.
E86's DON'T have secondary cats, they have a pair of silencers in there. Removal of these would, I think be a fail under the new rules, as any parts fitted from the factory should still be present, at least that's my interpretation of the rules.
My car still has the "cats" fitted, but as Steve pointed out, they are empty inside.
Mike
mr wilks said:
No, because visually they are still there. Emissions wise, the primaries and their closed loop monitoring more than meet euro standards. I believe the secondaries were added for US/Canadian markets where the limits are lower.
Mine has passed two mot's without a problem.
Mike
