KPA Vs PSI?
 

Im currrently still running wastegate (7psi) so I have my fuel map scaled to 110. I want to add more boost in the next few days so I need to know what the max KPA I would need for say 15psi?


Thanks
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15 PSI (relative to sea level atmo) is about 203 kPa. So go ahead and scale to ~220 or so to give yourself some headroom.

Sweet, and then to fill in the rest is it best to divide the 220 by 12 and scale each row with the difference?
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I would a few rows around idle, then go on the pattern. Say 20, 25, 30, 34, 40, 60, 80, etc. Do some research on scaling them. I keep all my maps scaled the same (cept VE cause it's 16x16) so that it's easy to read them and they're all similar. And I keep the number simple too. And when looking at a datalog, if I'm smack in THAT cell in VE, I was in that cell in my other tables as well.

Meh, scratch that. Here's how I scalled my 12x12 tables. Copy me. :)


Attachment 209110

Meh, take it back again. You want a few extra rows around idle IMO. That layout for spark and AFR works good though. I have 16x16 fuel tables, but this is what I did.


Attachment 209109

Well, DIY has observed that more resolution is required at the lower part of the table, to provide more precise control at light to moderate cruise. Here's how theirs are scaled. I tend to agree with them. Mine's still linear, and I could use some more resolution down there:

http://img26.picoodle.com/img/img26/...um_4f853bc.gif

I scaled my map for cruising resolution....

http://www.boostedmiata.com/timing/aug-2008-fuel.jpg

google "15 psi in kPa" and add 101 (atmospheric pressure) to the result. teach a man to fish, right?

pat, when you open up MS Paint to paste in your screen cap (AFTER you've hit print screen), go to the Image menu and select attributes. set it to 50 x 50 pixels. THEN ctrl-V.

I BELIEVE it will save the image attributes for next time. yay!

Thanks, I was wondering why I was getting such low #'s. I didn't know to add the 101.
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kpa = psi * 7 + 100


FWIW, I have zero issues fueling with only 3 boosted rows in my map. Watch a log in boost and see why.

Yeah, yeah, I got it now. That an old pic from when I didn't know how to crop.

If anything, on spark, i'd recommend you have a few extra columns for RPM between idle and 3K. I my redo mine. 500 RPMs isn't perfect for me.

6.895, actually. :D

For folks who have trouble with converting units, OnlineConversion.com is a great website. They have calculators for every combination of mass, weight, volume, speed, temperature, pressure, density, etc imagineable. Need to convert between parsecs and Egyptian cubits? They've got it. Got a map that's scaled in zeptobar and need to convert it to torr? They've got it. Want to find out how much you weigh in Thai baht, stones, or aincent Hebrew tetradrachm? Yup.

I am going to meet Joe at a meet one day and he's going to be the guy standing in the background, explaining some absurdly complex blinker switch to some poor new guy, and every 30 seconds he will push his coke-bottle glasses just a little bit back onto the bridge of his nose. ;)

lmao.


Question on scaling the KPA numbers...if I scale it down like you guys are suggesting, how do I create VE numbers that will allow the car to run OK until I log some more? or will it attempt to scale them too?

By hand. Use your eyes and brain to interpolate between existing cells and then enter the resultant values into the new cells.


Hehe.

The funny thing is that my eyes are about -4.5DV, so in the days of old, I did in fact have marginally cokebottle eyeglasses- the lenses were over 1/4" at the outer edge. God bless modern high-index refractory materials.

Last night, a co-worker and I were having some discussion about the likely direction of Obama's energy policy, and what impact this might have on the clearance rate of pending construction permits for proposed new nuclear reactors. Larry's kind of a paranoid sort (we're about 10 miles from the San Onofre nuclear plant here) and he starts asking questions about TMI, Chernobyl, etc.

By the end of the conversation, I'm rattling off into void coefficients, the inherent problems of graphite moderation in light water reactors, the different between supercriticality and prompt criticality, the Windscale fire, SL1, pebble-bed reactors, breeding, "thermal" vs. "fast" neutrons (and how they're like rolling a ball across a busy road vs. shooting the ball out of a potato gun across the same road), why CANDU is cool (because it permits the use of plain ole' uranium ore, and can actually run at full power entirely on the unrefined waste product from other plants), etc etc., and at some point I think to myself "How the hell do I know all of this shit? I never studied nuclear engineering, and frankly I tried to avoid physics as much as possible."

From a purely objective standpoint, I'm guessing I probably fall into that category of "just enough knowledge to be dangerous."

And yeah, I have to be really careful not to bore the shit out of people at parties. :blah:

drive with one hand on the wheel, one on your laptop. One eye on the road, one eye on both the laptop and AFR gauge...


or log on your way to work and analyze and reload the map on the way home and log again....

Is there anything you don't know something about? Seriously.
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Love. :cry:

:ughug:

Unfortunately we can't learn that from a book.
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confucious say: he who write notes about love on hand end up with inky penis

:rofl:

I'm offended!

Don't get me wrong. That time that we had together was fun, but it wasn't... you know.

lol, I figured that would be the answer, So just get close enough to what I think it should be based on whats around it, drive around, make sure its OK, and let the the log analysis do the rest of the work?

I worked on a 15psi fuel map this morning but before I just go ahead and burn it in is there anything I should do with the spark map? Here is what mine looks like.
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:wavey:
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Seriously, why does everybody drop out ~10 degrees of timing as soon as they go into boost? That map's probably "safe" in a sense that it won't knock, but it's not optimal by any means. Timing values should climb after peak torque to peak power. Yours don't. IE-at 183 kPa if you can run 13* at 5200, you can run more than that at 6300 and even more at 7K.

i do, but hell I'm 10° more advanced than that map even at the 100kPa row...

http://boostedmiata.com/timing/oct-12-08-timing.jpg

I drop around 7° of timing within the first 4psi. then another 7° by 4K where i see 14psi.

Yeah, I know its not optimal. Im more concerned with it being safe for higher boost until I get to a dyno.
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Run my map, it's safe and better than yours.

That one^^?
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Yeap. You might change the idle cells if you want though. I run more advance there than anybody else for personal preference.

Cool, can you zip it?
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Here you go. Use at your own risk. Don't blow your car up. Not my fault if you do.

haha

"use mine, it's safe but if you blow up your car using it, your fault!"

Pretty much. lol.

But actually, I have a bigger turbo than you so my high boost/low RPM cells are not necessarly "safe", though they should be.

Ur killin me man. Thanks though.
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Use your brain. Do what I did. Find every timing map you can on this site. Took me like 1 hour of searching and I had printed 20 different maps and labeled them with who's they were. Then I look at them and figure out which ones are fair, decent, ridiculous, etc. Then look at the ones that are close to your setup. That one I posted is running in my car and does well. But like I said, I have not ran 12 PSI at 2500 RPMs because my turbo doesn't spool that fast. So those cells are not necessarily "tuned", though they should be safe. If anything, pull two degrees out of the boosted cells and then run it and see what happens. In all honesty, you should be able to run it like it is no problem. I have yet to hook up my knocksenseMS to tune it out, but I know that map is safe on my setup. Perhaps not optimal, but safe.

Thats exactly what I have been doing. I have about 8 or 9 maps saved so far so I can analyze them. I'll deff be looking for more so I can compare them all.

FYI, when I said ur killin me I was joking. ;)
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