Ok, well this only applies to people who are supercharged... and it isnt a 100% perfect fix, but hell its alot better than no tuning at all.... If it works then i wont have to run pig rich at 7k to be safe at 8,200k
So all i did during classes today was brainstorm how to fix fueling after 7k on my car, i had some pretty crazy ideas, including setting my stock shiftlight to always come on at 7k, run the wire from the light in the guages to a relay, which would open an air solenoid valve, which is fed by a vacum line from the manifold, then through a MBC, and into a FMU so that it would raise fuel pressure based on a fraction of the boost only at 7k and up....
Rigged,.,., I know.
But then i was taking a piss and the light bulb went on in my head, except this time it was more like a halogen bulb in one of my work lamps.
So, heres the new plan... Please dont flame me, but just let me know if you think it would work.
Well damn.... As i typed this i realized that the 2-bar tune doesnt change fuel... But it made me come up with a new idea
If we can rescale the tables for a 2-bar tune then couldnt i rescale the tables to bring my max RPM up to 8,200 RPMS as the last tuning variable???
Much simpler than what i was about to type up
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So yea, ignore the genious part in the title lol... I thought i was on to something big... New idea isnt so big, but hopefully will work.
Im also trying to do the 2-bar tune in excel but i still am unclear as to actually rescaling the axis for the tables
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Ok, well the bulbs out...
But im still not getting the 2-bar, im looking at your 2-bar tune write up as we speak but im still not getting how you change the map axis...
Or is it set so that when your viewing the table in the VCM editor, it still says 0-100 across the top, but you just change your numbers as if it said 0-200?? Im kinda lost
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The way its working in my head now is that as far as the PCM sees it, no matter if its a 1-bar sensor or a 2-bar sensor, it will read 20-100. However the ammount of voltage a 1-bar sensor sends to the PCM for say 50KPA, the 2-bar sensor will send the SAME voltage at 100KPA?
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I believe the scales stay the same. They are just changed in the write-up so you can keep them straight in Excel or whatever you are doing them in.

2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
Ben Brown wrote:The way its working in my head now is that as far as the PCM sees it, no matter if its a 1-bar sensor or a 2-bar sensor, it will read 20-100. However the ammount of voltage a 1-bar sensor sends to the PCM for say 50KPA, the 2-bar sensor will send the SAME voltage at 100KPA?
The scales are the same, I never changed them.
1 bar sensor at 50kpa = 2 bar sensor at 100kpa, thats right.
So you can "rescale" the MAP axis (doesn't change the values on the side), because you are using a different sensor with a different scale. There is no sensor you can change to rescale the RPM axis...
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Well then back to my crazy ideas,
What if i installed an AFMU, with a MBC in line to limit the amount of boost that reaches the FMU, this could allow me to have the fuel pressure raised a slight amount to compensate for the lack of tuning past 7,000 RPMS. It would be rough but if i tuned my VE tables with that system installed couldnt it work pretty accurately?
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Thank you Shifted for beeing so patient, its hard to find people willing to help Tuning n00bs like me
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Ben Brown wrote:Well then back to my crazy ideas,
What if i installed an AFMU, with a MBC in line to limit the amount of boost that reaches the FMU, this could allow me to have the fuel pressure raised a slight amount to compensate for the lack of tuning past 7,000 RPMS. It would be rough but if i tuned my VE tables with that system installed couldnt it work pretty accurately?
Personally, I'd pick up a BEGI adjustable FMU, and start playing with rising fuel pressure rates instead of trying to proportion the boost through an MBC.
4cyltuner.com - Information Source For 4 Cylinder Tuners
Buy stuff from CarCustoms Ebay! Won't be disappointed!
Ben, you've got mail

1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Ben... your idea holds water until you consider this.
You hit 18 psi at 3200 rpm... and it holds until redline...
But as the RPM's go up your volumetric efficiency will go up demanding more fuel by sucking more air...
Yet your fuel won't raise because your boost isn't going up...
See what I mean?
We need a way to raise fuel from 6800-8200 via RPMs vs map or RPM vs TPS... but either way it has to be RPM...
I don't think much is going to come of it HPTUNERS has considered our platform basically finished.
-Chris-
-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...