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Learning how to build Lotus Seven replicas...together!
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PostPosted: October 7, 2022, 11:16 am 
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Joined: September 19, 2009, 12:33 pm
Posts: 498
What barometric correction mode do you have enabled in the Megasquirt?

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PostPosted: October 7, 2022, 1:06 pm 
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Joined: February 20, 2009, 2:27 pm
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Location: Reno, Nv
I am not using any barometric correction. I am simply letting the megasquirt set it on startup. Driving around my home the reading is about 85kPa.
The more I look at information to answer your question the more I am confused.

I notest that my VE table that I had been autotuning had much lower numbers up to 85kPa and 90 - 100kPa they were much higher and never got autotuned and that's why the engine ran so bad.
I had one log file from the track day that showed every time the engine ran above 85kPa it would misfire like it was shut off but would run fine if I held the throttle below that point.

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PostPosted: October 21, 2022, 9:47 pm 
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Joined: February 20, 2009, 2:27 pm
Posts: 531
Location: Reno, Nv
Well, last weekend I went to ThunderHill raceway for another SCCA Track Event :drive:
Had a lot of fun and getting better, still driving way below the car's capability. After tweaking the tune the car ran much better. On the last run I heard some light knocking and after getting home and reviewing the video I could here it started before I heard it. After watching the analog oil pressure gauge under heavy braking it would drop to near zero. The tuner studio dash gauge never dropped down below 30psi so I need to work on that.
After taking a few days off I am working on pulling the engine for a tear down as I believe I have spun a bearing.
When I modified the oil pan to get the engine lower in the chassis I made a decision to put the oil pickup at the rear for a good supply under acceleration and I put a baffle with a one way gate to help stop the oil from running forward under braking. My system is not working as I had hoped and I am going to install the Dry sump pump and tank I got years ago.
I am going to post some of the video in a few days.

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PostPosted: January 18, 2024, 10:39 pm 
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Joined: February 20, 2009, 2:27 pm
Posts: 531
Location: Reno, Nv
Well I finely got back to the forum and a lot has happened. I did go to Thunder Hill Sept 10th and had a lot fun. I tried to upload a short clip but it failed.

Attachment:
Engine OUT.jpg
Attachment:
Number 4 Rod Bearing.jpg


I sent the crank to get re-ground and No.4 rod was stretched so I got a new one.
I had a used tank an I got a used Auto Verdi 6 stage pump that I cut down to a 4 stage (1 pressure and 3 scavenging). I modified the oil pan again, moved the alternator to the right side and mounted the pump where the alternator was.
Attachment:
Dry Sump Tank.jpg

Attachment:
Dry Sump Installed.jpg


With the bad (cold) weather here I am working on a few other thinks to finish the car. First Is the front fenders. I made a one piece mold and laid up one fender but destroyed the mold removing it. Next I used the one fender to make a two piece mold and laid up the second fender.
Attachment:
Fender Mold.jpg

Using the former tool on some 1 inch conduit I am working on the fender stays.
Attachment:
Fender Stays 1.jpg
Attachment:
Fender Stays 2.jpg
Attachment:
Fender Stays 3.jpg
Attachment:
Front Fender Test Fit.jpg

That's it for now.


You do not have the required permissions to view the files attached to this post.

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PostPosted: January 19, 2024, 8:06 am 
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Joined: September 22, 2005, 8:12 am
Posts: 1879
Location: 4AGE in S.E. Michigan
That is a nice looking fender :cheers: :cheers:
What did you use for the release agent in the mold?


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PostPosted: January 20, 2024, 9:57 am 
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Joined: February 20, 2009, 2:27 pm
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Location: Reno, Nv
In making the mold from the first fender I sprayed the fender with primer then applied a few coats of wax and it separated at the primer with some going each way.
Before the second fender I applied four layers of paste wax then a heavy coat of hair spray then one more of hair spray. When the mold came off it did so at the hair spray

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PostPosted: January 21, 2024, 8:50 am 
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Joined: September 22, 2005, 8:12 am
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Location: 4AGE in S.E. Michigan
Hair spray on top of the wax! Thanx Dave


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PostPosted: January 21, 2024, 3:28 pm 
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Location: Reno, Nv
The second to last sentence should have said "Before the second fender I applied four layers of paste wax then a heavy coat of hair spray then one more of WAX.

As the hair spray is a weak plastic it was shredded with about half on each surface.

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