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New boost gauge
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Fred & Cindy
Picture of Fred & Cindy
posted
I just returned from my mechanic where he installed a boost gauge for my 8.3 Cummings, 240 horsepower. Never had one before. Anyway, the max boost PSI coming home was 23-24 in 3rd gear going uphill. It mostly hovered around 10 on straight road. Are these normal readings for my motor?


1990 32' Regency, Wide Body
Spartan Chassis, 8.3 CTA Cummins
4 Speed Allison Trans
South Central Missouri
 
Posts: 356 | Location: Missouri | Member Since: 06-24-2012Reply With QuoteReport This Post
Steve VW
Official Barth Junkie
Supporting Member of Barthmobile.com 1/24
Picture of Steve VW
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I am interested in the feedback also. My 8.3 has no EGT or boost gauge. These are high on my list to get in place to be able to monitor engine loading.

Max boost pressure is normally about 26-28 psi, limited by the waste gaste. At partial throttle, the boost will be lower. The part throttle boost at various rpms would be good to know indeed.

When I get gauges I will report on the results.


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 325+ hp
 
Posts: 5263 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Steve VW
Official Barth Junkie
Supporting Member of Barthmobile.com 1/24
Picture of Steve VW
posted Hide Post
Found this one from Billy T's coach:



9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 325+ hp
 
Posts: 5263 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Gary Carter
Supporting Member of Barthmobile.com 4/08
posted Hide Post
Cummins ISB 5.9L
Max boost about 22psi although when I had full HP saw 30psi
Normal about 10psi at cruise
EGT runs 900 to 1000 and straight and level and up to 1300 on a hard pull.

Our waste gate is set to open at 30psi


'92 Barth Breakaway - 30'
5.9 Cummins (6B) 300+ HP
2000 Allison
Front entrance
 
Posts: 1200 | Location: Minneapolis/Yuma | Member Since: 08-17-2006Reply With QuoteReport This Post
MWrench
Supporting Member of Barthmobile.com 03/22
posted Hide Post
quote:
Originally posted by Gary Carter:
Cummins ISB 5.9L
Max boost about 22psi

Our waste gate is set to open at 30psi


Ummm not on a stock 5.9L 190-230 HP Cummins. Maybe on yours with the changes you made BUT a stock waste will open 20-22 PSI.


Ed
94 30' Breakaway #3864
30-BS-6B side entry
New Cummins 5.9L, 375+ HP
Allison 6 speed
Spartan chassis
K9DVC
Tankless water heater
 
Posts: 2178 | Location: Los Gatos, CA | Member Since: 12-08-2005Reply With QuoteReport This Post
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