Quote:
Originally Posted by shr133
1 of my goals was to get rid of the dip and the dip starts when they turn off PI and change the cam timing and a few other things....
I don't know why you would turn PI on, off and on again.... Running both will smooth it out... At mid load I have no dip in acceleration.... I think turning off PI and the exhaust cam timing is for emissions not performance...
This will never be a drag car so I'm tuning for drive ability and passing power... So I am currently running this on my butt dyno for now till I get the maps sorted out... It doesn't take a genius to know if something works or not...
I'm getting to the point I have to dyno it and start doing 0-60s to sort out the small details... But it runs way better than stock at all rpms...
I don't know if running PI all the time will help HP on a dyno but it will make the engine run better and eliminate 2 transitions that help to cause lag and hesitation...
Just flash it and drive for a day if you don't like it just flash back...
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Are you logging PI/DI injection volumes or PW at all? The only reason I ask is that I tested something the other day with 25% PI ratio through the whole of the table (SC car so more volume) and the PIs weren't actually used until quite late and mid/late load. I'm guessing down to minimum volume or PW parameters so something else. I've got more testing to do, I'm trialing an easy way to get PI/DI error minimised without having to run fully PI or fully DI.
I agree that there must be benefits to PI with regards to the mixture benefits, but if you're saying that you didn't feel the dip then you'd see that on a dyno. However I know someone who says that they tested various ratios on a dyno and found little to no benefit from changing them. You really need to test not just the different ratios but the extra ignition timing it allows you to put in as a result.