Do Not Sell My Personal Information Jump to content


Recommended Posts

Another MOT passed and the first one with the "home made" exhaust I put on the car.

I am just interested to see what emission readings other owners have that still have the OEM exhaust on their car - I don't really understand the sheet that comes with the MOT read out but is as follows:

Fast Idle Test

CO % vol: Max limit = 0.2 / Actual = 0.14

HC PPM Vol: Max limit = 200 / Actual value = 59

Natural Idle Test

CO % Vol: Max limit = 0.3 / Actual Value = 0.16

Is this along the lines of an OEM exhaust?

 

 

 

Link to comment
Share on other sites


14 hours ago, is200 Newbie said:

Another MOT passed and the first one with the "home made" exhaust I put on the car.

I am just interested to see what emission readings other owners have that still have the OEM exhaust on their car - I don't really understand the sheet that comes with the MOT read out but is as follows:

Fast Idle Test

CO % vol: Max limit = 0.2 / Actual = 0.14

HC PPM Vol: Max limit = 200 / Actual value = 59

Natural Idle Test

CO % Vol: Max limit = 0.3 / Actual Value = 0.16

Is this along the lines of an OEM exhaust?

 

 

 

CO % Vol: Max Limit = 0.2 / Actual = 0.01

HC PPM Vol : Max Limit = 200 / Actual Value = 12

C0 % VOL :  Max Limit = 0.3 / Actual Volume = 0.01

This was mine on 23.3 2017 Standard Exhausts.

Link to comment
Share on other sites

My last MOT

 

2006 manual 90,000 miles

OEM exhaust

 

Fast Idle Test

CO % vol: Max limit = 0.2 / Actual = 0.03

HC PPM Vol: Max limit = 200 / Actual value = 51

Natural Idle Test

CO % Vol: Max limit = 0.3 / Actual Value = 0.30 (not sure that this isn't an overprinted value of max limit)

 

 

 

 

Sent from my Iphone using Lexus OC

Link to comment
Share on other sites

I agree with John - exhaust changes downstream of the cats will have no effect on emissions.

But for the record, the emissions reported are relatively high.

My most recent MoT for the Lexus reads 0.01% CO and 12ppm HC on fast idle and 0.01% CO on Natural idle.

Incidentally, my wife's Mii reads 0.00% CO and 2ppm HC on fast idle and 0.00% CO on Natural idle.

Even my 25 year old MX-5 is cleaner  - 0.02% CO and 55ppm HC on fast idle - Natural idle figures not reported.

I wouldn't read too much into any of that though - a lot depends on the exact state of the engine tune on the day, how long the engine has been running for and so on - probably most importantly the state of the cats and the forward Oxygen sensors. And look at the trend over a number of MoT reports - if the emissions are rising over time, it may indicates deterioration of the cats and or Oxygen sensors..

 

Link to comment
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share



×
×
  • Create New...