Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-31-2013, 08:51 PM   #1
Rivet Master
 
mayco's Avatar

 
1982 31' Airstream 310
champaign , Illinois
Join Date: Jun 2013
Posts: 2,183
Is my turbo working?

ok, this may be another stupid question to some but here goes. since ive never owned a turbo charged vehicle before, my isuzu turbo engine is all new to me. my question is, without having a point of reference, how do i know if my turbo is functioning properly or at all. i was bound and determined to get our maiden voyage in this fall and indeed a couple weeks ago we ventured about 100 miles to raccoon lake SRA in central indiana. we had an absolute blast and the 310 ran very well i must say. ive been working my way through her like so many others and i was pleased. i didnt keep track of our miles per gallon. she did seem to have a little problem with the inclines in the central indiana area which i consider to be rather mild. i never had to down shift but if i didnt get a running start at a long incline she would slow down a bit and seemed to have a bit of trouble maintaining a consistant speed. since i really dont know what the performance should be im just wondering if my turbo is functioning properly. is there a way for me to tell or do i just need a qualified mechanic to look at it. on relatively flat interstate i was running at about 2850 rpm at 60 mph. any thoughts folks.
__________________

__________________
mayco is offline   Reply With Quote
Old 10-31-2013, 09:23 PM   #2
1 Rivet Member
 
1985 34.5' Airstream 345
Centennial , Colorado
Join Date: Jul 2013
Posts: 18
You should have a boost meter on the dash. It should indicate an increase in pressure as the turbo kicks in.
__________________

__________________
Heirstream is offline   Reply With Quote
Old 10-31-2013, 09:34 PM   #3
Rivet Master
 
ROBERTSUNRUS's Avatar

 
2005 25' Safari
Salem , Oregon
Join Date: Mar 2006
Posts: 7,239
Images: 18
Blog Entries: 51
Hi, your turbo should also make a high pitched whine noise; This doesn't mean that it is working correctly.
__________________
Bob

2005 Safari 25-B
"Le Petit Chateau Argent"
[ Small Silver Castle ]
2000 Navigator / 2014 F-150 Eco-Boost / Equal-i-zer / P-3
YAMAHA 2400 / AIR #12144
ROBERTSUNRUS is offline   Reply With Quote
Old 10-31-2013, 11:22 PM   #4
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
If your rig does not have them, both a boost and an exhaust temperature meter are very helpful. The exhaust temp is quite critical on a diesel, especially a turbo one. A friend had a diesel 280 and the exhaust temp would go up to dangerous temps on any grade. He finally found that some PO idiot had put the mufflers on backwards. After that he could run rings around me in my 454 equipped 310. He could hill climb fantastically well. Now, the brakes on his 280 were terrible and mine were much better so he went uphill fast and downhill slow, I went slow up, but never had any stopping issues so could come down faster than he did.
__________________
idroba is offline   Reply With Quote
Old 11-01-2013, 03:17 AM   #5
Rivet Master
 
mayco's Avatar

 
1982 31' Airstream 310
champaign , Illinois
Join Date: Jun 2013
Posts: 2,183
thanks folks. now does the boost gauge work off a vacuum line? i was up under the dash the other day replacing the heater control cable and found what appeared to be a vacuum line just hanging free. i didnt know where it should be connected and its still hanging there. could this be the line going to the boost gauge? is there any other vacuum powered gauge or control up under the dash?
__________________
mayco is offline   Reply With Quote
Old 11-01-2013, 04:57 AM   #6
CLOUDSPLITTER Phone home
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 10,802
Images: 1
Thumbs up

When the turbo spins-up the manifold vacuum becomes pressure.

The gauge indicates both and is connected to the intake plenum.

Bob
Attached Images
 
__________________
"What you do speaks so loudly, no one can hear what you say"
M. Levy




So when is this..."old enough to know better" supposed to kick in?
ROBERT CROSS is offline   Reply With Quote
Old 11-01-2013, 08:47 AM   #7
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
Quote:
Originally Posted by mayco View Post
thanks folks. now does the boost gauge work off a vacuum line? i was up under the dash the other day replacing the heater control cable and found what appeared to be a vacuum line just hanging free. i didnt know where it should be connected and its still hanging there. could this be the line going to the boost gauge? is there any other vacuum powered gauge or control up under the dash?
All of the heater and dash air conditioning controls are vacuum operated. The lines are all under the dash.
__________________
idroba is offline   Reply With Quote
Old 11-01-2013, 02:15 PM   #8
Rivet Master
 
mayco's Avatar

 
1982 31' Airstream 310
champaign , Illinois
Join Date: Jun 2013
Posts: 2,183
its sure a mess under that dash
__________________
mayco is offline   Reply With Quote
Old 11-01-2013, 02:18 PM   #9
Rivet Master
 
mayco's Avatar

 
1982 31' Airstream 310
champaign , Illinois
Join Date: Jun 2013
Posts: 2,183
im not getting a reading on either of the turbo gauges so i got to trace down whats up. so, there should be a vacuum line to the pressure gauge?
__________________
mayco is offline   Reply With Quote
Old 11-01-2013, 03:12 PM   #10
Rivet Master
 
Currently Looking...
1995 36' Classic 36
boulder , Colorado
Join Date: May 2011
Posts: 1,237
Quote:
Originally Posted by mayco View Post
im not getting a reading on either of the turbo gauges so i got to trace down whats up. so, there should be a vacuum line to the pressure gauge?
Can't speak specifically of the Isuzu but the Cummins doesn't supply vacuum for the heater. There is a separate electric vacuum pump for that. You should see at least a few pounds of boost under load. If not I would expect a gauge problem or turbo problem.
__________________
Kota is offline   Reply With Quote
Old 11-01-2013, 03:50 PM   #11
Rivet Master
 
Smartstream's Avatar

 
1982 28' Airstream 280
Port Angeles , Washington
Join Date: Aug 2008
Posts: 1,262
When you open the doghouse you will see a cast aluminum tube going from left to right across the top of the engine. It's 3" to 4" in diameter. Right in the center on top of the tube is a small elbow fitting with about a 1/16" I.D. rubber tube, it looks like a vacuum tube. That is the tube that goes to your boost gauge. If you remove the tube and rev up the engine you will feel the turbo pressure. The original BAE turbo was a low pressure aftermarket add on turbo and will provide a maximum boost of about 10 psi.

The Isuzu has a vacuum pump on the rear of the alternator. The original step is vacuum operated as well as the cruise control. Some years have vacuum operated A/C and heater controls, some do not. My 1982 has no vacuum to the A/C and heater control.
__________________
Cheers, Dan
________________________________________


"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~
Smartstream is offline   Reply With Quote
Old 11-01-2013, 06:07 PM   #12
Full Timers/Diesel power.
 
Mike Leary's Avatar
 
1983 31' Airstream310
Cactus Hug , Arizona
Join Date: Mar 2007
Posts: 2,540
Images: 11
[QUOTE=mayco;1374281 i was running at about 2850 rpm at 60 mph. any thoughts folks.[/QUOTE]

Unless you're smoking, your Turbo/Isuzu should be close to it's factory specs .Around 3200 rpm is max from GM specs with the turbo.If you're going to keep the the old dear, think about a overdrive unit, we have one.
__________________
"A settled wisdom, plus the itch to be elsewhere"
Mike Leary is offline   Reply With Quote
Old 11-02-2013, 07:27 AM   #13
Rivet Master
 
mayco's Avatar

 
1982 31' Airstream 310
champaign , Illinois
Join Date: Jun 2013
Posts: 2,183
as always folks, thanks so much for all the valuable info. im going to check into the overdrive units but its gonna have to wait till the budget allows. thanks for all the good info on the turbo, ive been reading quite a bit on how the unit works and i think ive got a better understanding on whats going on. sure appreciate all you folks for your experience and willingness to share. good on ya!!
__________________
mayco is offline   Reply With Quote
Old 11-20-2013, 07:59 PM   #14
Dazed and Confused
 
Isuzusweet's Avatar

 
Currently Looking...
1983 31' Airstream310
Hillsburgh , Ontario
Join Date: Sep 2012
Posts: 1,804
When I bought my 310 TD the turbo boost gauge didn't work. Not hearing any turbo noise/whine I thought there was a possibility that my turbo didn't work. I talked to a diesel friend who told me that if the coach is accelerating fairly well and not spewing black smoke everywhere, the turbo works. It turned out that the vacuum line was disconected from the intake plenum.

If your turbo doesn't work it's like stuffing a sock into the intake. Without sufficient air intake the diesel fuel doesn't burn completely and is ejected from the cylinder in the form of black smoke. Without complete burn the engine doesn't make peak horsepower.

Of note…….Shepherd57 found his turbo sandblasted to a point that the intake fins were worn down and the turbo wasn't pushing air as efficiently. Make sure your air filter is clean using a filter cleaner or soap and water and re oil the pleat material (there should be no holes in the pleat material). It is critical that the filter is good especially in dusty conditions.
__________________

__________________
Isuzusweet is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Humphrey gas light not working properly bmklawt LP Gas, Piping, Tanks & Regulators 6 12-05-2011 09:58 AM
'64 Dometic Fridge working fine...a relief! PA BAMBI II Refrigerators 0 11-10-2011 06:13 PM
RM2500 just stopped working TouringDan Refrigerators 6 09-25-2011 10:44 PM
Electric working with battery not with 110 TX_DB Electrical - Systems, Generators, Batteries & Solar 11 04-24-2011 07:19 PM
License plate light not working worksology Lights - Interior & Exterior 7 04-08-2011 05:05 AM


Virginia Campgrounds

Reviews provided by



Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:27 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.