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Old 06-01-2018, 12:17 PM
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delete - see previous

Last edited by Lesmyer; 06-01-2018 at 12:22 PM.
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Old 06-29-2018, 01:09 PM
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Well, rear is quiet and has survived some more runs (without the trans brake so far). Best run so far is 11.20 @ 119mph in the warmer humid air we have been having. Looks like I might have to wait until cooler weather in the Fall to try to get into the 10's - hot humid air really saps the power out of the engine (lower oxygen content per volume so cannot burn as much fuel). But I still don't know if and how much the trans brake will help. Right now I am leaving off the light at about 1500rpm. My peak torque is around 4500, so there is some potential for reducing the 60" time when using the trans brake to get up into the power band - exactly how much remains to be seen. Still haven't been able to put my eyeball on the A/F meter during a run ALL THIS YEAR - it's very strange - I think about it while staging but once I hit second gear it's long forgotten!

Wife bought me my birthday present early - a Daytona Sensors CD-1 Ignition Box and coil. This box not only does the CD multi-spark ignition, it also is a three step rev limiter (engine max, burnout, and stage), a limited data logger, interfaces with a laptop, and does programmed timing curves. Also has MAP sensor input available for 3D timing curves and ignition retard when you have a turbo (which I don't), but you can also program a timing retard during starting. You can build custom advance curves for a distributor with locked out mechanical advance and download them to the box. I intend to use the staging rev limiter to control my engine to a specific rpm 3000 or above while on the trans brake, instead of just going full throttle against it. My converter actually stalls at 4100 rpm when full throttle against the trans brake, so there is a range from 3000 - 4100rpm where I can investigate in 100 rpm increments what might be best rpm to leave at.

Once I lock out the centrifugal advance in my distributor and unplug the vacuum advance, I can change my timing by simply downloading a different advance curve (instead of turning the distributor). Pretty nice I think for investigating even 1 difference at a time in total timing!! and easy to return to exactly the same place!

As far as data logging I can hook up my wideband A/F gauge and digital speedo sensor and log engine RPM/Timing/fuel mix/vehicle speed - and download it to my laptop later for analysis to look at converter efficiency, wheel spin off the line, fuel mixture during the run, and know exactly what RPM it actually shifted.

I'm not planning on it, but you can set the box up to control relays to actually shift your trans at programmed RPMs for individual shift points. You see that happening on the Street Outlaw cars where they shift themselves during a run. Of course theirs is also controlling their fuel injection system where mine is not.

Probably much more I could do with it, but I think it's a pretty cool little box to play with. Hope to get it installed soon.

CD-1? Ignition Systems Overview | Daytona Sensors?

Here's the 11.20 run from two weekends ago. Note that shock adjustment on the front is keeping the front wheels down a bit more when doing the hit using my off-idle staging technique. We will have to see what the front end does using the trans brake. Should be interesting. Maybe spin and slower time? Maybe hook and really go!!



Last edited by Lesmyer; 06-29-2018 at 01:35 PM.
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Old 06-30-2018, 02:41 AM
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Nice run.

For the starts it will be interesting to see what will happen with your trans-brake.
Looking forward to see the results and how the suspension will react. As always it may come down to find the best balance. I could imagine that the transfer of force to the rear and downwards helps grip but at the same time de-stabilizes the front.

For a stranger. Would you consider this to be a nice drag strip? Looking good, new pavement?
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Old 06-30-2018, 02:53 PM
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Originally Posted by error_401 View Post
Nice run.

For the starts it will be interesting to see what will happen with your trans-brake.
Looking forward to see the results and how the suspension will react. As always it may come down to find the best balance. I could imagine that the transfer of force to the rear and downwards helps grip but at the same time de-stabilizes the front.

For a stranger. Would you consider this to be a nice drag strip? Looking good, new pavement?
it's a very old drag strip started in the 1950s still run by the same people. Old surface and definitely not perfect but they do prep it, even for test and tune on Fridays. It is IHRA sanctioned. Not many small 1/4 mile tracks out there these days - most are 1/8 mile to keep speeds down and that is not preferable to me. We consider ourselves to be lucky to still have it. They have a live Facebook feed on most race days if you want to watch sometime. Osceola Raceway. Just a bunch of locals.

Last edited by Lesmyer; 06-30-2018 at 03:04 PM.
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