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Stock Boost Questions

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#1
It's already been a long week, I'm working my way through a few adult beverages and don't feel like putting my engineering degree to use, so I'm just going to ask here.

Why do I only see 9 psi on my performance pages under full load? 4th gear pulls, 5th gear pulls, 6th gear pulls (A8) doesn't seem to make a difference.

Completely stock 2016 Challenger Hellcat. Located in Phoenix, so about 1000' MSL, and 110* days.

I assume the 11.6 psi the factory quotes is at standard temperature and pressure, but didn't think 40 degrees and 1000' would drop it that much.
 

Paladin06

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#2
There are many variables. Altitude, temperature, barometric pressure. 11psi is best conditions.
 

ACMAVRO

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#3
I’m at sea level on hot, humid Mississippi gulf coast and I get 10
 

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#4

fumanchu182

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#5
Map pressure - barometric pressure is the main part of the equation. Throw in aircharge, aircharge temp, grains of water in air and size and humidity...
 
OP
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Thread Starter #6
Map pressure - barometric pressure is the main part of the equation. Throw in aircharge, aircharge temp, grains of water in air and size and humidity...
Map Pressure...

I don’t want to be the one to break it to you, but I think you're suffering from RAS. I bet you take money out of the ATM machine too 😀

https://en.m.wikipedia.org/wiki/RAS_syndrome
 

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#7
It's already been a long week, I'm working my way through a few adult beverages and don't feel like putting my engineering degree to use, so I'm just going to ask here.

Why do I only see 9 psi on my performance pages under full load? 4th gear pulls, 5th gear pulls, 6th gear pulls (A8) doesn't seem to make a difference.

Completely stock 2016 Challenger Hellcat. Located in Phoenix, so about 1000' MSL, and 110* days.

I assume the 11.6 psi the factory quotes is at standard temperature and pressure, but didn't think 40 degrees and 1000' would drop it that much.
Because of where you live AZ. , high altitude vs. at sea level & hot weather kills boost & hp.
 
Last edited:

Phast Hemi

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#8
It's already been a long week, I'm working my way through a few adult beverages and don't feel like putting my engineering degree to use, so I'm just going to ask here.

Why do I only see 9 psi on my performance pages under full load? 4th gear pulls, 5th gear pulls, 6th gear pulls (A8) doesn't seem to make a difference.

Completely stock 2016 Challenger Hellcat. Located in Phoenix, so about 1000' MSL, and 110* days.

I assume the 11.6 psi the factory quotes is at standard temperature and pressure, but didn't think 40 degrees and 1000' would drop it that much.
Normal for that weather/climate.
 

fumanchu182

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#9

BULL

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#10
Or how about RPMs?


How many Ms?


:unsure:

:LOL:
 

BULL

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#11
It's already been a long week, I'm working my way through a few adult beverages and don't feel like putting my engineering degree to use, so I'm just going to ask here.

Why do I only see 9 psi on my performance pages under full load? 4th gear pulls, 5th gear pulls, 6th gear pulls (A8) doesn't seem to make a difference.

Completely stock 2016 Challenger Hellcat. Located in Phoenix, so about 1000' MSL, and 110* days.

I assume the 11.6 psi the factory quotes is at standard temperature and pressure, but didn't think 40 degrees and 1000' would drop it that much.



Using any method that suits you, including pulling it from your work "vehicle", determine the DA for the moment you're referencing.


I'm typically at 7500DA or higher, and I see 8psi most of the time, once in a great while I see a flicker of 9psi.


The :poop: part is the 100hp that goes along with that...


:mad:
 
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Thread Starter #12
Just calculated current DA using the National Weather Service calculator and pulled the variables from the current observation on base here.

3500' DA right now. So Bull you're over double that and see similar performance as I am. Still seems odd to me.
 

BULL

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#13
Just calculated current DA using the National Weather Service calculator and pulled the variables from the current observation on base here.

3500' DA right now. So Bull you're over double that and see similar performance as I am. Still seems odd to me.

If you're pulling a solid 9psi, then that's a decent bit better than me.

Remember our scale is a bit non-linear and also the resolution leaves a lot to be desired.
 

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