03-01-2014, 12:03 PM
(This post was last modified: 03-01-2014, 12:04 PM by Rippthrough.)
(02-01-2014, 11:45 PM)Martin306 Wrote:(02-01-2014, 07:52 PM)Rippthrough Wrote: It can be overfuelling, the emissions test is only light throttle, you're not even off the idle track for that.
It's not overfuelling. The car is being driven around town. Lots of stopping and setting off again, likely journeys of less than 5 miles so the engine is never really getting a chance to heat up and "lean out" to optimum. 28mpg is not unacceptable.
Emissions test is conducted at 2 speeds. idle and fast idle (2-3000 rpm) so you would be "off the idle track"That is why the fast idle test exists.
No, you are not off the idle track at all, the throttle pot has twin tracks on these, the idle track runs up to about 10% of full throttle to give better resolution for low throttle openings, you are NOT off that for fast idle, not even close.
When mine was standard I used to be getting around 35-40mpg on short journeys, and mines the shitty single point injection system with the underfloor cat which does take much longer to come off the enrichment warmup than the multi's, but even then most TU's don't take long to warm up, they hold a lot less water and oil than the XU units and as standard have intake manifold heaters and a hot air feed to the intake for cold starts.
As Piggy says, check the brakes over. Don't bother with the super 4's, if your existing plugs are in good condition they won't make any difference.
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