MSnS-E v2.2 029t Fuel Only

partial tune. i can run 5psi up to about 5k rpms and then the primaries reach 80% duty cycle. so i felt that would be a good stopping point.

i think the rpm oscillations might be a little excessive.
i can't remember if auto-tune was still on or not. hmm.

hold on....trying to figure out how to host the log file somewhere......

 

Here's a datalog from earlier today. running down the interstate if 4th gear. boost controller set to 10psi. Running Staged Injection. Can't seem to figure out why my secondary duty cycle is only half of the primary injectors.

http://www.msextra.com/download.php?id=5666

 

Secondary duty cycle is meaningless in this case. When using the staged injection option, if secondaries are off, and secondary duty cycle = 0%. If past the staging point, secondaries are on, and are fired at a pulse width and duty cycle equal to the primaries.

 

that's what i mean, when the secondaries are off, the datalogs do show them at 0%, but when they're on, they are only half the duty cycle of the primaries. the secondary pulse widths are equal to the primaries. only thing wrong is the duty cycles.

 

Ignore the secondary duty cycle data. As I said, duty cycle for primaries and secondaries is identical after staging. There'll be a bug in your msnsextra.ini file causing incorrect calculation of duty cycle 2, but as it's meaningless anyways, nobody's bothered to fix it.

 

oh ok. yeah, was thinking something was seriously wrong because if the pulse widths are the same at the same RPM, then the DC must be the same unless the secondaries are only firing every other time, which doesn't seem possible.

i feel much better now, thanks. so, i am only to assume that if my DC1 is showing nearly 80%, then i'm reaching the limit of my 550/720 combination? i planned on going to 720/850 eventually anyhow, just didn't want to do it so soon.

i was going to try to run it at 12psi, but by looking at my IAT's, anything more than 10psi seems rediculous. 150 degrees sounds insane to me. on that note, i know you want the IAT's to be as cool as possible, but what is the upper limit as far as intake temps?

 

ARE YOU USING the stock intercooler? i relocated my iat sensor after the intercooler(front mount) but before the throttle body. trying to keep it out of the heat of the engine.

 

I'm running 550/720 as well, and am also seeing 75-80% duty cycle running just under 10psi. I'll be swapping in 720 primaries this winter, along with a V-trim hybrid. The IAT sensor needs to be measuring the temp of the air entering the engine to apply proper density corrections. As turbosa22c says, make sure it's located after the intercooler.

 

of course it's after the intercooler. it's about 1.5 inches away from the factory IAT.

but all for not. low compression on the front rotor has drawn my attention from further development/tuning of my Megasquirt.