Re: Type 1 twin screw supercharger build / 9 yrs later I'm back at it

panel · Post by **panel** » Sun Dec 03, 2023 11:46 am

Wow , yeah your build is so cool . Out of the box thinking for sure. You could tell you had some electrical background by looking under your seat area there. All nicely tucked away and channeled ! Keep up the good work !!

Alexander_Monday · Post by **Alexander_Monday** » Tue Dec 19, 2023 2:21 pm

The schematic I posted had flaws, so I corrected them and added a fuse and made the pull up resistor optional.
I found this out when I received the test circuit board I had ordered, populated everything but the IC's, and bench probed it for errors.
Here is the corrected schematic and the PCB I just ordered that is more compact than my soldered proto board.
Hopefully this is correct.

P.S. So far I have had cam sync every start with the soldered proto board.

Phase Detector V1.1.jpg

Phase Detector.jpg

Post by **Piledriver** » Thu Dec 21, 2023 6:33 am

SlickER.!!!

Alexander_Monday · Post by **Alexander_Monday** » Mon Jan 01, 2024 9:14 am

New circuit boards arrived.
I made 3 minor errors.
Got the holes for the fuse clips rotated 90 degrees from what they should be.
Took some fanagaling, but not fatal.
Missed 1 trace to an IC pin, but the one next to it has the same net so jumped the two.
It did not work properly bench testing.
Troubleshooting found the problem.
The prototype has an original Signetics NE558 that has been in my electronics stuff for decades.
I used a knock off 558 this time since they have been obsolete for decades and I do not have more originals.
The real 558 trigger inputs have enough bias that the outputs of the opto-couplers did not need pull up resistors.
The knock off does not, so I added two 1K pull ups on the back of the board.
I should have added them originally since the datasheet does not specify trigger input impedance, but hindsight is 20/20.
I also added a push in switch with LED backlight to the front in place of the LED and jumper on the board.
Installed it in the car and it works properly.
About 1/2 the size of the soldered prototype and looks more professional.

20231228_113108.jpg

20231228_113416.jpg

Post by **Piledriver** » Tue Jan 02, 2024 9:00 am

Sweet!

Alexander_Monday · Post by **Alexander_Monday** » Mon Apr 22, 2024 9:44 pm

Finally on the road and starting to shake down and tune.
Kept it below 3500 rpm for a couple of hours worth of mixed driving with autotune with multiple stops to check and save the ve trim table. (Running MAF)
At 60 mph in 4th gave it increasing throttle multiple times to start expanding the range.
Log shows 3 PSI at 3000 rpm at 1/2 throttle in 4th.
Happy with that since I have a large pulley on the supercharger for shake down.
Large pully calculates to 8PSI at 7200 rpm.
Best news is that my CHT's and EGT's were not low or high and similar on all cylinders.
Oil temp was good also.
So the dual shrouds and oil bypass before the cooler are working as designed.
Developed an oil leak from passenger valve cover.
Ordered some new c channel valve cover gaskets and stud seals from CB.

20240422_162348.jpg

V8Nate · Post by **V8Nate** » Tue Apr 23, 2024 3:19 am

That is awesome great work! I'm sure your very happy to get back behind the wheel

Chip Birks · Post by **Chip Birks** » Tue Apr 23, 2024 1:16 pm

Well done! Always nice when your efforts pay off!

Post by **Piledriver** » Fri Apr 26, 2024 1:40 pm

Video of smokey burnout with supercharger whine or it didn't happen

Alexander_Monday · Post by **Alexander_Monday** » Sat Apr 27, 2024 11:15 am

Smokey burnout will be delayed awhile. Just got released from the hospital this morning with a 23mm long stint at the beginning of the LAD on my heart to open up a 70% blockage and multiple others that they will monitor for now. Apparently I avoided a widow maker.

Chip Birks · Post by **Chip Birks** » Sat Apr 27, 2024 12:57 pm

Yikes! Glad you made it to the other side of that visit!

Post by **Piledriver** » Mon Apr 29, 2024 1:43 am

Good visit, get well.

Ol'fogasaurus · Post by **Ol'fogasaurus** » Mon Apr 29, 2024 8:33 am

I looked LAD up and Yeow... that is scary. I had a triple bi-pass (heart attack) many years ago so I know kind of what you went through.

Take care.

Lee

Alexander_Monday · Post by **Alexander_Monday** » Mon Apr 29, 2024 9:27 am

Ol'fogasaurus wrote: ↑Mon Apr 29, 2024 8:33 am I looked LAD up and Yeow... that is scary. I had a triple bi-pass (heart attack) many years ago so I know kind of what you went through.

Take care.

Lee

Yours was far more invasive than mine, and I didn't have a full-blown heart attack so feeling pretty lucky.
As long as the stent holds there is one more at 60% that they will probably stent but didn't want to do both at once.
The rest, besides a 95% in a minor artery that they cannot ballon, are 30% or less for now.

Ol'fogasaurus · Post by **Ol'fogasaurus** » Mon Apr 29, 2024 12:33 pm

Alexander_Monday wrote: ↑Mon Apr 29, 2024 9:27 am
Ol'fogasaurus wrote: ↑Mon Apr 29, 2024 8:33 am I looked LAD up and Yeow... that is scary. I had a triple bi-pass (heart attack) many years ago so I know kind of what you went through.

Take care.

Lee
Yours was far more invasive than mine, and I didn't have a full-blown heart attack so feeling pretty lucky.
As long as the stent holds there is one more at 60% that they will probably stent but didn't want to do both at once.
The rest, besides a 95% in a minor artery that they cannot ballon, are 30% or less for now.

I had 2 heart attacks at work, 3 days apart (assholes driven stresses). The Bi-pass surgery was less painful than the attacks and the reasons for them were The Surgeon, said I would be dead in X-number of years and the heart Dr. said by 2000, so do all you can and maybe it will help keep you going longer than the specialists expect.

Lee

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