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is my turbo shot? 6.5l td

H

hydrovacer

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There, I'm new to the diesel community. I bought a 98 chevy 2500 with the infamous 6.5. I have no boost. Eliminated the vac pump, cleaned the wastegate for proper operation. I took the intake boot off where the turbo meets up and with the truck running I place my hand over the outlet of the turbo and nothing. My boost gauge shows a lil vacuum and when I rev it u the vacuum increases. I'm assuming due to no boost and its sucking air in. Is there something else I can check or do I bite the bullet and go buy a new turbo? Thanks for any helpp. Its muchly appreciated.
 
The vac pump is what makes your boost unless you've got a turbo master. So your not going to make boost without it, and just reving it up doesn't make boost you have to drive it.
 
First, Welcome and congratulations on joining the group of 6.5'ers. :thumbsup:

IIRC, a 98 also has a catalytic converter, so there is potentially more complexity to low / no boost than just vacuum and am sure the better experts will start to chime in shortly. One thing that will help is a few more details about the truck in terms of what is / is not stock (as far as you can tell), and exactly is going on in terms of current troubleshooting (Ex: how was the wastegate verified for proper operation? What does 'the vac pump eliminated' mean, etc . . .); spelling out the effort will help with the analysis and guidance.
 
Agreed even under idle conditions( full flowing exhaust, nice cool air, full flowing air fliter piping, turbo master, etc) you will only get 1-1.5 psi at idle.
 
Howdy Hydro V, got a name :) Welcome to the site

Could be several things, my 1st question is with the vac pump removed how are you keeping wastegate closed, you are new here so give us a little time to asses your knowledge of the what I prefer to call the VENERABLE 6.5 and not the infamous 6.5 to know one is to Love one :) you found the right source for things 6.5 and keeping them alive.

Yours being a Canadian truck very possible you have EGR & Cat as well even in your 2500 that is normally a non EGR/non Cat South of the border. What is 8th digit of VIN S or F ?

Once you get your posting wits about you here, update your signature line and you also mite want to spend some time in the 6.5 TRL http://www.thetruckstop.us/forum/forumdisplay.php?218-6-2-and-6-5-Technical-Reference-Library turbo is probably not shot we can help you determine that copy/paste this http://www.thetruckstop.us/forum/showthread.php?6300-6-5-Engine-Diagnostic-Troubleshooting-Checklist in the 6.5 engine area and we can get the ball rolling how to troubleshoot what you have going on there .

WG operation is counterintuitve when WG opens boost is lowered by lessening the available drive gasses to the turbine, so you want a closed WG to make more boost. Post in 6.5 engine specifc area and we can git-R-done :) I'm curious and add in the new thread why the vac pump was removed?

Again Welcome to the site.
 
My issues started with no vacuum coming from vac pump. So I'm waiting on a turbo master. I had wired the wastegate shut temporarily (not my daily driver, just parked for now) and still no boost. I figured even at idle it would show a lil boost. As far as I know the truck is all stock and has the F as the 8th vin number. I took apart the exhaust and can visually see no soot build up on the wastegate aswell I can hear it making contact. I had somebody today tell me it may be a plugged fuel filter but I'm not convinced.
 
Well it is a POS turbo anyway. You should return the turbomaster and get a better turbo.

You need a load to make boost. Idle will NOT have any boost. Maybe in drive foot to the floor you can get some boost doing a brake stand. Maybe at 2K rpm with no load it could make some boost. Turbo's work off heat to make boost, except really small ones that plug up the exaust and make boost from airflow alone.... Like the factory GMx POS we get...

Wiring the wastegate shut is a bad idea. After 14 PSI the turbo is being run over redline, turning out more heat than boost, and generally a bad thing. Any load and high RPM can run the turbo there and the computer will shut down fuel on you.

You will need a tune later no doubt.
 
Well, I must say I feel pretty silly right now, I just got home from work nd decided for shits nd giggles I was gonna see if I can get boost by putting the truck in drive nd attempting a "brake stand" success. At 2000 rpm my boost gauge went upto 10psi. Soon I will be putting the turbo master on than some insurance. Thank you all very much for all your input.
When it comes to replacing my stock gm-8 turbo for an aftermarket one I'm not overly interested. This truck is mainly going to be used for dump runs nd going quading. So a huge investment in a turbo isn't in my budget.
 
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