Mr. Goatman wrote:Wow. good information here. Thanks to all in the discussion. A couple of other questions come to mind. Is an EGR necessary (for TBI)? I have not read anything about it until now. I have a non EGR performer manifold.
Since I like to plan ahead... I know nothing about programming. When I am ready to swap the Howell ECM for one that can control spark should I go for the 47 or the 27? I already have a 7747 in a box somewhere (other than the Howell which is also a 7747)
Can someone speak as to the purpose of a knock sensor?
You may want to review thew parts required FAQ on the binderplanet.
I discuss each part and what is required and what is optional.
The Howell ecm is the same as your other 7747.
In fact the chip is the same.
Howell simply provides an inline tach filter to send to the ECM so it will still fire the injectors while you use the stock ignition.
So the only difference is in the wiring for the timing control and the distr set up.
Several guys with the Howell system have simply added the required wires for the timing control and modified the distr as described earlier.
Here's the main injection FAQs
http://www.binderplanet.com/forums/show ... hp?t=47254
Just click the link and then scroll down to TBI and click the parts required link.
The knock sensor is a protection device. It allows you to run a pretty agressive timing curve and if you get a load of bad gas or really hot thin air and the engine starts to ping, then the Knock sensor hears it and sends a signal to the ECM to tell it to retard the timing.
It's optional and not really needed but is nice to have a good working one if you do your own tuning.
You don't have one with your carb and it does ok, right?