Vacuum/boost reference hose that doesn't expand
Thread Starter
Launching!
Joined: Sep 2008
Posts: 222
Likes: 46
From: Dayton, OH
Vacuum/boost reference hose that doesn't expand The MAP says 9.5 PSI but my boost gauge says 8.5 PSI. I suspect the vacuum/boost reference hose is expanding. Does anyone make hose that doesn't expand or has minimal expansion?
Thanks!
Thanks!
If volume increases then pressure decreases, not the other way around. In reality though, the volume of a vacuum hose is so small compared to the volume of the intake that it is not going to change pressure.
MAP can be any number scale so long as it is consistent. It can be in camel farts per acre and you can still tune with it. You might be able to put a custom transfer function into the engine software to calibrate the MAP if it really bothers you.
MAP can be any number scale so long as it is consistent. It can be in camel farts per acre and you can still tune with it. You might be able to put a custom transfer function into the engine software to calibrate the MAP if it really bothers you.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 222
Likes: 46
From: Dayton, OH
If volume increases then pressure decreases, not the other way around. In reality though, the volume of a vacuum hose is so small compared to the volume of the intake that it is not going to change pressure.
MAP can be any number scale so long as it is consistent. It can be in camel farts per acre and you can still tune with it. You might be able to put a custom transfer function into the engine software to calibrate the MAP if it really bothers you.
MAP can be any number scale so long as it is consistent. It can be in camel farts per acre and you can still tune with it. You might be able to put a custom transfer function into the engine software to calibrate the MAP if it really bothers you.
As long as I see the same max every time it is ok. Actually it gets to 8.5 on the gauge, not sure what RPM, and stays there until I lift.
squishy hose won't give you a 1lb difference. Likely just a calibration/voltage/ground issue w transducers. The push lock nylon hose works well though and won't expand if you want to prove it to yourself. 
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