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Pushing PSI

  • Thread starter Thread starter TDCRacing
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TDCRacing

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1 PSI at idle and 18 at WOT and kr free.


Just thought i'd post up one of my videos. Thought it was kind of funny when my brother told me he runs 4psi at idle in his duramax....


Sorry if you cant see it good and there is something wrong with the car because it surges it's but off....so excuse that if you have the eyes to pick it out on the scanner...its far from running perfect



 


maybe it's the bbv not being in the exact stock location? figured this was just because of the smaller pulley
 




It looks like you ran into what my concern was for making my own gauge on the scanner using the MAP sensor input. A 2 bar map is going to start off with vaccum, hit mid point or around 2-2.5 volts, then read boost up to 1 bar or roughly 14.5 lbs of boost. The gauge should read 0-200 Kpa and is more accurate and then you can convert your number with the tool menu in the scanner, you just have to subrtract 14.5 or 14.7 from that number to get your real boost. 1 bar is atmospheric pressure, 2 bar is that number times to or will read to 14.5-14.7 psi over atmospheric pressure. Your gauge would have to start with vacuum and then go to zero and then show boost to be right and this is something I never played with too much as I couldnt get a straight answer on the best way to set it up.
 
So did he go with a 3 bar MAP sensor then? I've often wondered how they work and all, aren't they required for something over 15psi?

dee dee dee!
 
In Codys GN we are using a 3 bar BUT just for his alky controller and also for the boost controller I will be making in the near future. both require to read boost in the over 15 psi ranges, since his car is turbo and will never see under 15 psi at full song a 3 bar is a must for these two devices. The problem again lies with the fact that the sensor is going to read about 2 volts to open atmosphere-no vacuum or boost from the engine, and you must have some way to scale in the vacuum end of the spectrum. A 3 bar map will read from 0-300 Kpa or up to about 29 psi boost over atmospheric pressure. It still uses the same exact 0-5 volt range as a 1 or 2 bar sensor but it must be scaled differently.
 
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