>What do you think is better for tuning SU's -- a Unisyn
>or a Colortune?
Well, I've tuned carbs with a Unisyn and I don't have
a Colourtune, though I've heard good things about it.
But I know it's possible to synchronize the carbs with
a Unisyn or equivalent flow gauge.
The advantage to the Unisyn (especially given what
you've already told me about your car's problems) is
that it gives you a better indication of what's going
on inside the combustion chamber -- the Unisyn only
tells you about the flow rate at the carb mouth.
There is a relationship between the two, but it's
fairly complicated.
The best bet would be to have a Unisyn for each carb
throat, a Colourtune for each cylinder, and a rolling
road chassis dynamometer so you could optimize the power
output at something other than idle. Remember whatever you
use that tuning a car (especially one with SUs) at idle
is guaranteed to give you a tuned idle -- it doesn't
guarantee smooth running under heavy load at high RPM.
--Scott
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