Anyone use colortune?

[JimmyZ]

Just curious if anyone has used colortune on our Z's.

After finding that certain SU's float adjustments differ from front to rear it got me wondering about how one could verify the mixture between two carbs.

Sure, tuning the carbs only addresses idle mixture and we are relying on the needle to provide the necessary mixture curve with RPM increases. It would be nice to know the precision in mixture adjustment gained by using colortune.

Another question is whether two C-tune's could be used at higher rpm to verify ideal mixture?

One could always use multiple EGT/CHT pickups or to get a really accurate idea but that is going a bit far.

Jim

[beandip]

I have a color tune and have played with it . It is a helpful tool. You could use more than one I suppose . I use mine on #2 and #5 usually. You can see the flame color from idle on up to about 3K. Not recommended to go higher. I bought mine on line from a Lotus Parts dealer in Pa. about 7 years ago for about $45.00 .www.rdent.com After using it a few times and seeing how the engine runs at the different settings I usually set the carbs by feel and when I check the mixtures they have been on. I loaned it out to a couple of Z drivers and one of them broke one of the parts and didn't tell me. I can still use it but it stays home now. the best tool is one of the old Sun Machines that was used for years. testing the out put from the exhaust is the best . Gary