It would be nice if there was some kind of dongle you could plug into the usb version and connect by Bluetooth. Although I played with the curve using usb for a while and have great performance and haven't touched it in a couple of years now. I probably don't need to play with it any more, but I want to.
It isn't so bad, provided you have the distributor pointed in a reasonable direction. I have the port to the right on the Giulia, and I'm able to get the USB cable in fairly easily using a mechanic's mirror. I'm not sure I'd leave the allen screw cover open as that might expose the electronics to moisture (and, this being an Alfa, oil.)
Is anyone aware of whether it is possible to extract a square wave rpm *signal* from a 123 dizzy? I have the Zeitronix ZT2 AFR logger, but the analogue signal from the coil negative is very noisy. The dizzy does output an rpm signal as the 123 virtual "dashboard" contains a tacho - can this be pulled via the USB and extracted for use in other software, (or even just logged)? The 123 manufacturer does not respond to emails and all the resellers don't have that level of product knowledge.
I know some people (Ed) have built filters to effectively convert from analogue to digital (square) wave to provide a more stable rpm input for the ZT2, but my skills to build this, even with a circuit diagram, are limited! The "filter" in the zeitronix unit doesn't appear to be very effective.
It is because he wants a clean signal to input to his Zeitronix ZT2 so that he can data log AFR and RPM. There are many posts on that subject. It is as good as dyno testing for Weber or programmable FI tuning.
Here's a video if you want to see how it looks. Pulling out of a parking lot, accelerating up to speed, and then doing some accel/decel. If you click on the YouTube link it's a lot bigger on the site.
Note that I'm running 15deg vacuum advance, so the advance at times will be a lot higher than the centrifugal curve. Curves are shown below, I can probably get a bit more aggressive with the centrifugal ramp but I'm keeping it close-ish to stock curves until the car is sorted.
That really is pretty neat! I was also thinking about timing runs in 3rd from say 3500 to 5500 with different setups like advance and jetting to see what works best. Might be a good way to quantify results. Done on the same road with the same conditions would be the way I'd do it. It would also be a good comparison within the community.
I have done a lot of tuning and testing in the way that Mike has outlined. Here are my suggestions:
Do a series of at least 5 runs in a short space of time with no changes and look at the variance in the data. This will help you identify real changes from "noise".
Do a number of runs, one after another with a particular setup and use the mean time. I used 5 runs.
Be wary of inferring performance changes from data collected on different days. You may be surprised how much temperature, barometric pressure, humidity, wind speed and wind direction can affect timed runs. I tried to test one change per day.
Some changes may produce more torque in one part of the rev range and less in another so do the tests over the rev range that is most meaningful to you.
I'm also finding getting the advance in sooner helps the low end. I have a 2 mile hilly (for around here) drive on a black top road before I get to the highway that is a posted 35 mph. When I take it easy I'll be in 4th and going up the small hills the extra advance gives me a smooth pull up the hill. On a semi related subject 60 mph is 1500 rpm in 8th gear in the Giulia. 60 at 1500 rpm, that's just crazy.
I am looking for a Bosch connector to fit the early 81-83 gtv6 dizzy. I am in the final stages on my 87 spider w/ 164s 3.0 swap. I am using the Bosch bim024 ignition module and no fuel injection, 3 Weber idf 40’s on fabricated manifolds. Just trying to find the right connector to finish the...
Hello all I just purchased a 1989 Spider Qudrifoglio. The car has been sitting for 16 years I dropped it off at the mechanics we did a tune up changed fluids refurbished the gas tank and fuel sender and the car feels gutless and won’t rev freely. Has anyone had these problems on there Alfa ?
Howdy peeps, my apologies if I've posted this thread in the wrong place. Mods, feel free to move it around if needed.
I've converted my EFI 1985 105/115 2.0 Spider to carbs - Runs great! But the car is still operating with both the Bosch ignition and fuel ECUs hooked up. I would like to remove...
I posted this in the Milano / 75 forum, but not much response so I thought I'd try here: It's been a while since I was on this forum; so long that I've been forgotten and had to re-register!
Anyway, I'm in the process of resurrecting my old hillclimb 75, and I'm having some problems which...
I just bought this car that needs to be put back together. My son and I are going to use this car for Auto X and we are wondering how the engine will stand up to this kind of use. It is mostly short tracks and probably wont get out of 2nd gear. Thanks for any and all responses