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- - msd btm (https://www.homemadeturbo.com/engine-management-10/msd-btm-14694/)

Maybe he though to advance timing on distributer, and retard with BTM under boost?
Anyhow.. I run 7psi (8psi creep) with stock ignition on my D14... no signs of detonation whatsoever...

Quote:

Originally Posted by TurboEF9

Quote:

Originally Posted by Whitey

With the BTM you should be advancing your timing to get a faster spool than using the BTM to take the timing out

..you're kidding, right? Every BTM I have seen is constructed for retarding of timing only. I've yet to see one advance timing "per psi". And if it does, that is the most ridiculous device to put into use on a force inducted setup.

Think about this. Say your spark is set to pop at 2.3 degrees at 9psi (based on your ECU's ignition map), and 7400 rpms. Add this to your static timing (assuming stock), you'll spark at 18.3 degrees BTDC.

We use your "Advance BTM", which would advance per psi of manifold pressure, set to say, .5 (one half of a degree per psi). (.5 advance * 9 psi) + 16 static = 22.8 degrees, BTDC, rather than the 11.5 degrees it would be when retarding (as BTM is meant to do)... ..got ring lands? :-\

I think you misunderstood what I said. I said with a BTM you can advance you initial timing than use the BTM to take timing out of it. EX. If your were running 2 degree timing retart without a BTM, you could advance your timing back to stock than use the BTM to RETARD the timing. I don't know any product that would advance timing per PSI ::)

Re-reading what I wrote I can now see where you got that idea. I'll try to be clearer in my responses next time.

That makes a little more sense. :D

..where I got that? Ya, I've heard crazier ideas come from people before. HAHA!

Quote:

Originally Posted by Whitey

Quote:

Originally Posted by TurboEF9

Quote:

Originally Posted by Whitey

With the BTM you should be advancing your timing to get a faster spool than using the BTM to take the timing out

you said in the last note that you dont any product retard timing per psi?
thats what the msd btm do. pn6762. you set your timing at stock timing, then the btm has two knobs, one on the box to set the psi amount that you want timing to start retarding, and the other knob is dash mounted, to set the amount of timing to retard, I have mine set to run at 1.5 deg, for every 2 pounds of boost. ::) ;D

Advance Timing, per psi.

Quote:

Originally Posted by TurboEF9

Advance Timing, per psi.

my bad! sorry