Wastegate Question

Badger · 11-03-2009, 09:22 PM

After reading other posts about boost pressure I realized mine was pretty low. Gauge reads 1lb at 65mp/1750RPM and max I have seen is 20lbs during WOT. I checked my boots and plugged the line that goes from the AFC to the waste gate resulting in no change. Is it possible for the waste gate to be stuck in the open position causing low numbers? My egt's are at 600* @ 65mph and rise fast with the throttle. All mods are in sig, what so you guys think?

Thanks

__________________
95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

MONEY PIT · 11-03-2009, 09:38 PM

I think that stock is set around 20lbs. I know this will not help but I would like to turn mine down

, it is easy for me to hit 35lbs without trying and I do not want to blow my head gasket. I have a little elbow valve to control it but have no idea weather to turn the allen screw in or out to decrease the amount of boost

__________________
98 3500 Q-cab 4x4 12v 5spd, 4:10 gears, US Gear splitter, 5" Stacks, boost elbow, 3 piece manifold, pyro/boost gauges, 22.5 Alcoas, Pac Brake,Eaton Fuller 13spd Shift knob with switches converted to elect. 220,000 Smiles!

Badger · 11-03-2009, 10:09 PM

I would think that if you open the valve up by moving the allen screw out it'll decrease the psi. You could just back it most of the way out and see what that gets you.

Is 0-1 psi boost low on the freeway or normal? Also with the afc to waste gate blocked I thought the boost would increase?

__________________
95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

Last edited by Badger : 11-03-2009 at 10:14 PM.

MONEY PIT · 11-03-2009, 10:17 PM

I will try that

. As far as freeway boost PSI all I can say is what mine is at and at 65mph It is closer to 3 or 4psi that is on flat ground of course.

__________________
98 3500 Q-cab 4x4 12v 5spd, 4:10 gears, US Gear splitter, 5" Stacks, boost elbow, 3 piece manifold, pyro/boost gauges, 22.5 Alcoas, Pac Brake,Eaton Fuller 13spd Shift knob with switches converted to elect. 220,000 Smiles!

Badger · 11-04-2009, 09:36 AM

Is there a direct relationship between low boost and increased egt's?

__________________
95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

tdshepard · 11-04-2009, 09:44 AM

Quote:

Originally Posted by Badger

Is it possible for the waste gate to be stuck in the open position causing low numbers? My egt's are at 600* @ 65mph and rise fast with the throttle. All mods are in sig, what so you guys think?

Thanks

I chased low boost problems until I discovered my wastegate was partially open. Rather than try to adjust my frozen actuator rod, I loosened the two nuts on top of the wastgate bellows and slid in a 1/4" spacer. That really made it pull on the wastegate flapper arm. Increased my boost about 10 psi.......

__________________
1994 Reg cab 2 WD manual trans #0 fuel plate . boost elbow. BHAF . 16.5* . 3KGSK . 13" SB clutch . KDP fixed

12VRattler · 11-04-2009, 07:40 PM

I had the same problem on mine where the wastegate was stuck partially open and solved it by shoving a shim in it as you mentioned. I believe as you screw the allen head in on the boost elbow it slows the boost signal to the wastegate allowing you to build more boost before it starts to open. All the way in should be like having it plugged off completely.

__________________
1996 2500 12v/nv4500 4x4 335k miles and still going strong!! KDP tabbed, Amsoil 4510 BHAF, evicted silencer ring, plugged wastegate, 5 inch FBE muffled, #100 plate, Isspro boost and pyro, Mickey Thomson ATZ's 285/75R16's, B&W steel flatbed

illflem · 11-04-2009, 08:27 PM

Kinked line to the boost gauge can cause low readings too.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

Badger · 11-04-2009, 09:04 PM

I'll look over the line. If it is kinked will straightening the line back out be ok or is it better to shorten the line? After a kink it'll usually cause a change to the inside diameter.

__________________
95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

illflem · 11-04-2009, 09:29 PM

Problem with most boost gauge tubing is once it's kinked it's very hard to keep it from kinking again in the same place.
If you thread the small tubing though some larger tubing it will keep it from kinking again.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

Badger · 11-07-2009, 08:31 PM

Installed new boost elbow and a 14cm exhaust housing w/ waste gate and still had low numbers so, I ended up pulling the gauge out of the pillar mount and located a kink that was a result of putting the gauge in the pod. Boost hit 35 after that.

Thanks for the information.

__________________
95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

11-03-2009, 09:22 PM	#1 (permalink)
Badger Cummins Fan Join Date: Nov 2007 Location: San Diego, CA Posts: 94 Thanks: 16 Thanked 2 Times in 2 Posts Badger's Truck Pics	Wastegate Question After reading other posts about boost pressure I realized mine was pretty low. Gauge reads 1lb at 65mp/1750RPM and max I have seen is 20lbs during WOT. I checked my boots and plugged the line that goes from the AFC to the waste gate resulting in no change. Is it possible for the waste gate to be stuck in the open position causing low numbers? My egt's are at 600* @ 65mph and rise fast with the throttle. All mods are in sig, what so you guys think? Thanks __________________ 95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

11-03-2009, 09:38 PM	#2 (permalink)
MONEY PIT Cummins Fan Join Date: Sep 2009 Posts: 90 Thanks: 2 Thanked 2 Times in 2 Posts MONEY PIT's Truck Pics	I think that stock is set around 20lbs. I know this will not help but I would like to turn mine down, it is easy for me to hit 35lbs without trying and I do not want to blow my head gasket. I have a little elbow valve to control it but have no idea weather to turn the allen screw in or out to decrease the amount of boost __________________ 98 3500 Q-cab 4x4 12v 5spd, 4:10 gears, US Gear splitter, 5" Stacks, boost elbow, 3 piece manifold, pyro/boost gauges, 22.5 Alcoas, Pac Brake,Eaton Fuller 13spd Shift knob with switches converted to elect. 220,000 Smiles!

11-03-2009, 10:17 PM	#4 (permalink)
MONEY PIT Cummins Fan Join Date: Sep 2009 Posts: 90 Thanks: 2 Thanked 2 Times in 2 Posts MONEY PIT's Truck Pics	I will try that. As far as freeway boost PSI all I can say is what mine is at and at 65mph It is closer to 3 or 4psi that is on flat ground of course. __________________ 98 3500 Q-cab 4x4 12v 5spd, 4:10 gears, US Gear splitter, 5" Stacks, boost elbow, 3 piece manifold, pyro/boost gauges, 22.5 Alcoas, Pac Brake,Eaton Fuller 13spd Shift knob with switches converted to elect. 220,000 Smiles!

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11-03-2009, 10:09 PM	#3 (permalink)
Badger Cummins Fan Join Date: Nov 2007 Location: San Diego, CA Posts: 94 Thanks: 16 Thanked 2 Times in 2 Posts Badger's Truck Pics	I would think that if you open the valve up by moving the allen screw out it'll decrease the psi. You could just back it most of the way out and see what that gets you. Is 0-1 psi boost low on the freeway or normal? Also with the afc to waste gate blocked I thought the boost would increase? __________________ 95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar. Last edited by Badger : 11-03-2009 at 10:14 PM.

11-04-2009, 09:36 AM	#5 (permalink)
Badger Cummins Fan Join Date: Nov 2007 Location: San Diego, CA Posts: 94 Thanks: 16 Thanked 2 Times in 2 Posts Badger's Truck Pics	Is there a direct relationship between low boost and increased egt's? __________________ 95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

11-04-2009, 07:40 PM	#7 (permalink)
12VRattler Cummins Fanatic Join Date: Apr 2009 Location: Sedgwick, KS Posts: 121 Thanks: 2 Thanked 0 Times in 0 Posts 12VRattler's Truck Pics	I had the same problem on mine where the wastegate was stuck partially open and solved it by shoving a shim in it as you mentioned. I believe as you screw the allen head in on the boost elbow it slows the boost signal to the wastegate allowing you to build more boost before it starts to open. All the way in should be like having it plugged off completely. __________________ 1996 2500 12v/nv4500 4x4 335k miles and still going strong!! KDP tabbed, Amsoil 4510 BHAF, evicted silencer ring, plugged wastegate, 5 inch FBE muffled, #100 plate, Isspro boost and pyro, Mickey Thomson ATZ's 285/75R16's, B&W steel flatbed

11-04-2009, 08:27 PM	#8 (permalink)
illflem Super Moderator Join Date: Nov 2005 Location: Montana Posts: 6,547 Thanks: 5 Thanked 298 Times in 263 Posts illflem's Truck Pics	Kinked line to the boost gauge can cause low readings too. __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Not stock

11-04-2009, 09:04 PM	#9 (permalink)
Badger Cummins Fan Join Date: Nov 2007 Location: San Diego, CA Posts: 94 Thanks: 16 Thanked 2 Times in 2 Posts Badger's Truck Pics	I'll look over the line. If it is kinked will straightening the line back out be ok or is it better to shorten the line? After a kink it'll usually cause a change to the inside diameter. __________________ 95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.

11-04-2009, 09:29 PM	#10 (permalink)
illflem Super Moderator Join Date: Nov 2005 Location: Montana Posts: 6,547 Thanks: 5 Thanked 298 Times in 263 Posts illflem's Truck Pics	Problem with most boost gauge tubing is once it's kinked it's very hard to keep it from kinking again in the same place. If you thread the small tubing though some larger tubing it will keep it from kinking again. __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Not stock

11-07-2009, 08:31 PM	#11 (permalink)
Badger Cummins Fan Join Date: Nov 2007 Location: San Diego, CA Posts: 94 Thanks: 16 Thanked 2 Times in 2 Posts Badger's Truck Pics	Installed new boost elbow and a 14cm exhaust housing w/ waste gate and still had low numbers so, I ended up pulling the gauge out of the pillar mount and located a kink that was a result of putting the gauge in the pod. Boost hit 35 after that. Thanks for the information. __________________ 95 CTD 2500 STD Cab 4X4, KDP Tabbed, Boost/Pyro, AFE Stage II, 4" MBRP Exhaust, ATS Exhaust Manifold, BD T/C and Trans w/ Torq Loc, DDP STAGE II INJECTORS, #10 PLATE, CFM+ Intake, HID Head lights, ROL BAK Cover, Carli Starter Kit and Track Bar.