MOT Assistance

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MKnight702

Original Poster:

3,110 posts

215 months

Saturday 14th March 2015
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Had my car in for its first MOT this morning. As I half expected, it failed on emissions.

My car is running a tweaked LS3 with no cats, I didn't build it so I don't have all the information, but as I understand it, it was originally built with a cat exhaust then swapped post IVA for more power.

Has anyone had experience with retro fitting cats into an exhaust? Any alternative suggestions?

Also, this is one for the factory I think, the headlamps failed as they tick up the wrong way. Are the headlamp units switchable for LHD/RHD or do I have the wrong units? If they are wrong, how simple will it be to swap the units to the correct ones?

MKnight702

Original Poster:

3,110 posts

215 months

Wednesday 18th March 2015
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Thanks for the replies (particularly GT5594).

The car is registered 2012 with an LS3 so there is no getting around the fact that the car needs to pass the full emissions test. The tester was fully aware of the regulations and knew that if the engine was pre '92 then a much less strict measure was due, unfortunately the engine is way past 1992!

My problem is that the engine in its current tune will not pass emissions, I understand from the previous owner that it did pass when fitted with exhausts with cats, and I am picking them up on Saturday in the hope that fitting these will be enough.

I am a little concerned, however, that this will not do the trick as I am currently running something like 5% not 0.7%(?). Backed up by the fact that the back of the car is covered in soot! I do know that the car has been "tuned" post SVA although I'm not sure what was done and I cannot find the garage that was supposed to have done the work (LS Performance or similar near London?). Does anyone know if it is possible to map the Partsworld LS ECU and who can do this otherwise I have a nasty feeling that the previous owner may have been ripped off and "tuning" consisted of upping the fuel pressure (which I can easily verify with a little time in the garage).

MKnight702

Original Poster:

3,110 posts

215 months

Thursday 19th March 2015
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I figured that fitting cats was going to be the way forward, that's why I'm picking them up Saturday.

As for the remap, does anyone know of a good mapper that can program the aftermarket Partsworld GM ECU?

MKnight702

Original Poster:

3,110 posts

215 months

Monday 23rd March 2015
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Well, I have fitted the new exhausts with cats just need to get retested.

One thing bothers me however, the exhausts are very close to the bodywork. There is heat protection on the underside of the body, but it's still very close.

MKnight702

Original Poster:

3,110 posts

215 months

Monday 23rd March 2015
quotequote all
I have found out that the ECU is a GM E67 unit.

Can anyone recommend a good tuner to set the engine up?

I did try Troy at Northampton Motorsport, but they don't do the E67.

If there is anyone within 100 miles of Cambridge that would be even better!

MKnight702

Original Poster:

3,110 posts

215 months

Tuesday 24th March 2015
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Is LS Power still going? I can't find it on the web, plus I think that may be who mapped it before and the jury is still out on that.

MKnight702

Original Poster:

3,110 posts

215 months

Thursday 26th March 2015
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YAHOO, passed!!!!!

MKnight702

Original Poster:

3,110 posts

215 months

Friday 27th March 2015
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Just cats. It did take 3 goes, but he got it through in the end. Now to put it all back how it was!

MKnight702

Original Poster:

3,110 posts

215 months

Friday 27th March 2015
quotequote all
FYI the tester was the same one both times, but without the cats there was no way it was going through. Pity they didn't come with the car when I bought it.