[lovedemnewfies]

So I called progression ignition and their answer was that the tach was off and that the grey wire off the dizzy wouldn’t have enough power to run the factory tach. So I guess I need to have the tach refurbished to have the “guts” installed to make it work.

[Formulajones]

Originally Posted by lovedemnewfies

So I called progression ignition and their answer was that the tach was off and that the grey wire off the dizzy wouldn’t have enough power to run the factory tach. So I guess I need to have the tach refurbished to have the “guts” installed to make it work.

So has Progression addressed this issue yet?

Sending a perfectly good working factory tach out to be modified is not really an option.

[73ta]

Originally Posted by lovedemnewfies

So I called progression ignition and their answer was that the tach was off and that the grey wire off the dizzy wouldn’t have enough power to run the factory tach. So I guess I need to have the tach refurbished to have the “guts” installed to make it work.

I talked to a guy that fixes taches and guages on second gen TA's. He said that the tolerance of those old tachs is =/- 10%. Mine is ok at idle but off about 500 RPM in the 2000-3500 and above range. He said he can calibrate them to be close at the top or at the bottom of the scale but not both.

[73ta]

Update, I replaced the tach circuit board with a new improved one. Tach is much closer now.

[68 Firebird]

Got one of the new PI HEI units for Christmas.
Got it installed and been tweaking timing table.
Any pointers on timing tables. Car is nice and
Responsive and interesting to see timing/vacuum while
Driving.

[Squidward]

I run FiTech with timing control, so it is a similar dealio, but the PI has more resolution. All I get to play with is idle/1100/3000/6000 and 2 different vacuum conditions (WOT and cruise).

I like a lot of base timing, and I use 28 at idle conditions. I'd be curious if your engine combo would like a simulated "manifold" vacuum advance condition. Right now it simulates a "ported" advance.

I see your "mechanical" is all-in by 3000. I usually liked that a little earlier on my engine when I ran a standard HEI. My normal around town cruise rpm is 2500-2600, so I like to have cruise timing in at that point - 42 degrees max for me. But my rpm breakpoint is 3000 rpm, so I have to do a little blending to get more high vacuum cruise timing. If I had more granularity in my system, I would go for more cruise timing like you have, somewhere close to 50.

I would be curious how your setup would respond by pulling in your wot timing from 3000 to 2500.

Isn't this fun? You can play around without spring changes or vacuum advance cams and tension screws!

[nytrainer]

What does the Y axis represent (20 - 101). Sorry if it’s obvious but I’m scratching my head on that.

[JLMounce]

Originally Posted by Squidward

I run FiTech with timing control, so it is a similar dealio, but the PI has more resolution. All I get to play with is idle/1100/3000/6000 and 2 different vacuum conditions (WOT and cruise).

I like a lot of base timing, and I use 28 at idle conditions. I'd be curious if your engine combo would like a simulated "manifold" vacuum advance condition. Right now it simulates a "ported" advance.

I see your "mechanical" is all-in by 3000. I usually liked that a little earlier on my engine when I ran a standard HEI. My normal around town cruise rpm is 2500-2600, so I like to have cruise timing in at that point - 42 degrees max for me. But my rpm breakpoint is 3000 rpm, so I have to do a little blending to get more high vacuum cruise timing. If I had more granularity in my system, I would go for more cruise timing like you have, somewhere close to 50.

I would be curious how your setup would respond by pulling in your wot timing from 3000 to 2500.

Isn't this fun? You can play around without spring changes or vacuum advance cams and tension screws!

That's all that the handheld lets you access Get your ProCal software running and you can control the cells between that are interpolated.

The PI distributor software is still has more resolution than the FiTech tables, but not nearly as much as the handheld imputs would have you believe.

From the table provided above, it looks like a good safe starting point. You may find it wants a bit more timing up top, for the timing to come in a bit sooner and it may tolerate more low load timing.

[68 Firebird]

Thanks for the feedback. Yes I wanted a safe curve as a baseline that was similar
to the curve in my HEI. My car likes a slower curve and dead stable timing in gear.
very minimal drop in RPM as the unit adjusts timing to load when dropped in gear.

still learning with this new toy, and had one long cruise last weekend. Saw that while
running down highway at 65-70, map sensor has me in 42 line of table. fun to observe vacuum and timing live on display. definitely more tuning needed.

Gerry