As above whats your opinion? For anyone not familiar watch this quick vid!
With SU"S each carb has only has one variable jet,so in general terms if the sleeves and needles are in good nick the whole rev range is generally accurate after the carbs are set when at idle! Its a far more accurate tool than a gas analyser where you only get an overall reading from the two carbs combined when one carb running lean may compensate for the other running rich.Never used one, mostly because I can't see how they would reliably set anything other than the tickover mixture. Revving a car in the driveway doesn't tell you anything about what the the mixture will be when the motor is under load.
Even if it was used under load on a dyno or on the road I can't see how the colourtune plug is going to give an accurate mixture indication when it's unlikely to match the heat range of the rest of the sparkplugs in the car.
Absolutely true if your motor is bog standard with a standard air filter & exhaust. I've tuned lots of cars with twin or triple SU's never needed anything other than the lifting pins for setting the mixture on standard motors that have SU's.so in general terms if the sleeves and needles are in good nick the whole rev range is generally accurate after the carbs are set when at idle!
The method i've always used in the past for setting up an 1800 B series is wind the jets flush with the bridge, back off the jet adjuster 2 1/2 turns, balance the carbs with an air flow meter then adjust equally until the CO meter reads 4.0% not forgetting to give the float bowls a couple of gentle taps with the back of a rubber handled screwdriver and a little rev to re-centre the jet after each adjustment.I havent used one since I was about 23 but set some MGB"S twins last week! Superb lil tool :tup:
hey fredrico,your rod will be the most fuel efficient 302 on the planet! forgot to tell you about the mgb,or did I? thats what gave me the idea in the first placeHey cant aford 25 quid for a colortune now ive got my dyno and gas anyliser in the shed lol joking apart tested one of these against a gas anylyser in the 80s as a bet with my mobile crypton tuner mate and was spot on