Can someone help me figure out my idle problem on the Dynatek? I plan to check the base timing tomorrow, but I would expect it to be right since Keith Craft built my engine and Dynatek came to them to help tune it.
Not trying to take away from this thread. I like the results shown here, but my car idles at 1600 to 2000 rpm at this time with this system. When I un-hooked my throttle cable it comes down on idle to 1000 rpm by putting pressure on the idle control rod, but even then it won't stay down. Now if I bump the throttle again it will bounce up to 2000 rpm all over again.
Any suggestions? I would like to nip this in the bud tomorrow.
Allen,
We did the work and development on Mick's Dynaformance system and what you describe is exactly the problem we had with Mick's.
Bigest problem was that the butterflies and/or the spindles do not line up properly and the small capscrews holding the butterflies were glued in so tight I gave up on moving them for fear of sheering them off. The throttle bodies themselves were not in line with each other so had to slot the two fixed throttle levers to get the linkage to line up, before when you tightened the cross screw it held one throttle body open.
With a bit of massaging with a plastic drift we managed, after umpteen attempts, to get the idle down from 2000 to arround 950, this was with extra springs to put tension the linkage. We did consider unhooking the coiled return springs on the throttle shafts and adding springs to the linkage.
Dynaformance knew about the problem as they have now modified their TB to take a thinner butterfly which is easier to seat, this was done in January this year so if you have an earlier kit, you will have the thick butterflies.
If you look at the Dynaformance software, they pull about 10 degrees of timing out at the last 2 % of throttle movement to help slow the idle, ours idled best at about 22 but had to cut it to 16 to get the numbers down, not ideal. Hopefully this won't be neccesary with the new TBs.
We have developed our system to take Accel DFI electronics (we are the Accel DFI EMIC for the UK ) as anything we do in the UK on a new car will have to pass an emissions or CAT test, the original Dynaformance kit was not capable of doing that. So we now have full IAC idle contol for the idle.
With the throttle blades fully closed we were getting 5% IAC on a 950 idle, so that gives you an idea of the air leakage round the butterflies even after our "remedial work"
If you want to PM me about your idle problem then please go ahead, will be happy to help
Mike