DamianGemmell Posted December 8, 2015 Share Posted December 8, 2015 I know this is a starlet forum but maybe someone can help. Ive got a 95 trueno gtz that keeps failing the nct because the CO reading at just under 3000rpm is too high. Now if you bring it up to 3090rpm its perfect but the nct centre won't do this. Does anyone here know how I can bring this reading down. I've tried butchering my air filter with a Stanley knife to leave more air in and it helped a bit but not enough. Is there any way to ingage the supercharger at say 2500rpm just for the test so it'll lean out the mix. Any advise would be much appreciated. Quote Link to post Share on other sites
russ78 Posted December 8, 2015 Share Posted December 8, 2015 shouldn't they be just doing an idle test on mot/nct ? surely as theres no uk equivalent on this model car what on earth is he putting the car down as on the database ? Quote Link to post Share on other sites
daniel_g Posted December 8, 2015 Share Posted December 8, 2015 CO relates to fuelling, youre running a bit rich.Give the car a fuckin roasting before its tested, make sure its right up to temp, cars run richer when they are cold.Do you have an adjustable FPR? If turn it down a wee bit just to get you by.Try taking the air filter off if you can, this will allow more air in.Do you have a CAT on the car?O2 sensor ok?Coolant temp sensor ok? Quote Link to post Share on other sites
DamianGemmell Posted December 8, 2015 Author Share Posted December 8, 2015 (edited) I reddened the bollox off it before the test. Drove there in 3rd gear. I tried explaining to him that if he reved it a little bit higher the supercharger engages and leans out the mix and the CO reading would go way down and he looked at me like I've 2 heads.I was hoping to find a way to engage the electic clutch sooner. CO at 2920rpm is 0.94%, CO at 3090rpm is 29%. Anything over 30% is a fail. I've an fpr for my starlet I might through into her for the test but I don't like the idea of running it too lean either. Edited December 8, 2015 by DamianGemmell Quote Link to post Share on other sites
DamianGemmell Posted December 9, 2015 Author Share Posted December 9, 2015 Got myself a gauge for my fpr today so plan is to fit them as soon as the weather clears up a bit, turn the pressure way down, remover the air filter and run her through the test as lean as I can. I'm just hoping it won't do any damage to her. Quote Link to post Share on other sites
glanzadude Posted December 9, 2015 Share Posted December 9, 2015 I think there is a pin hole in your turbo kit are exhaust Quote Link to post Share on other sites
Johnboy GT Posted December 10, 2015 Share Posted December 10, 2015 When I went for my mot I was told if I put my silencer back in my back box it would have helped my emissions. I got an aftermarket cat fitted to my exhaust for it as well.John Quote Link to post Share on other sites
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