The Demon carburetor will not be in my vocabulary here.
So i when out to our track for some testing.
the air held between 93 and 9400 foot all day.
The ET and 60' have nothing to do with my testing as this carburetor, 60 foots so much better, that there is just no way, of getting it to hook, on a no prep surface, and was not the reason for this outing.
The first 9 runs, was testing different shift points and really didn't show much improvement. but now, i am shifting at 6000 rpm instead of 5800. View attachment 1715552398
So after all of that i when for timing. timing light showed 22/36.
Decided to leave it there.
Drop the jets 2 numbers front and back Made another 3 runs. Picked up 1/2 of a mph. Pulled plug and it didn't show any signs of pepper.........so drop it another 2 jet sized and when another 3 runs......Picked up basically another 1/2 mph. So at this point i put my son in the car to hold the o2 sensor and the gopro to get a full pull o2 reading. Did two pass with that.
Then kicked his *** back out of the car, because he slowed my MPH. Made one more run in the right lane, that is the best lane because there is less bumps. Was .200s mph faster. View attachment 1715552401
#1 do you think its still a little fat?????
#2 do you think the MAB is good or what would you change.
The video is tough to keep up with........I may make a slo mo of it later, but you loose the sound, and can't tell when i shift from each gear.
I guess i had better put this in as well
408 Hyd [email protected], 243/247 .562/.550
12.8 compression
4200 stall
4.56 gear
28/10.5/15 M/T slicks
3860 pound car.
6600 foot elevation.
You might not be able to get the fuel ring much tighter than that on pump gas. The green on the plug means something...I forget what. I’ll get the link to what shrinker wrote on plug reading and post it here so you can read through it.
Just remember...if you are driving this car on the street (I think you do, I just don’t remember for sure) and you are using a power valve, dropping the primary main jet to clean up WOT may make you lean at a cruise. Of course, the opposite is true...adding primary main jet to clean up a lean WOT can make you fat at a cruise.
I mention that because it happens all the time. If you get to that point of being either lean or rich at cruise, you can correct the primary main jet and then change the power valve channel restricters to get your WOT back in shape.
Edit: I forgot to mention that you are doing it correctly in that you are jetting for best MPH. When you get to the point the MPH goes backwards, jet back up a skosh, and maybe add a bit of fuel so when you get out of nose bleed DA’s, you’ll be a bit safer then look at the fuel ring, and that’s where you want it to be for the fuel you are using.
