Duramax Diesels Forum Truck of the Week
  #1  
Old 04-23-2018, 07:15 AM
Yuptown_lly Yuptown_lly is offline
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Default Turbo spool

I just finished doing HG and studs on my truck and have driven the truck yesterday afternoon and this morning. I have noticed a constant spool, even under low rpms its seem to be building up boost cause I can see it on my gauge. Never remember the truck doing it before usually with it being vgt itll cut out at low rpms right??
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5" mbrp exhaust, 3" mbrp downpipe, s&b intake, Rudy's diesel turbo inlet, egr delete, profab economy flow intake tube, pcv reroute, fass titanium 150 lift pump, removed stock fuel filter assembly, lbz fuel pressure regulator, glowshift gauges, 2" lowering shackles, duramax tuner efi live[/I][/B]
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Old 04-23-2018, 11:34 AM
1FastBrick 1FastBrick is offline
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I don't have a boost gauge but I can certainly hear it spooling at lower RPM and mine is on a factory tune.

Since you have a tune the parameters were likely set for it to spool sooner.
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Old 04-23-2018, 12:25 PM
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Mine raises hell non stop, my LLY built boost right off idle
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Old 04-23-2018, 12:27 PM
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Did you make any other intake, exhaust or tuning changes while you were in there?
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Old 04-23-2018, 12:42 PM
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Vgts can build boost at low rpms. How low are we talking though? Normally if there is a issue with the turbo it will be the be the other way and not build boost until 2000rpms.


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Old 04-23-2018, 01:33 PM
Yuptown_lly Yuptown_lly is offline
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It comes and goes like a faulty sensor almost. Only changes I made were installed a fuel rail plug on the driver side rail and I tore off the insulation on the fire wall and didnt reinstall the turbo heatshield I'm just gonna wrap the a/c line. On the first test drive I did blow the passenger side intercooler pipe off at the lower boot but it shouldn't be leaking the truck makes 30 psi easily. When it does it theres a constant whistle, then from time to time itll just go away and get a drone like it normally does at low rpm and constant speed.
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2005 2500hd crew cab short bed lt
5" mbrp exhaust, 3" mbrp downpipe, s&b intake, Rudy's diesel turbo inlet, egr delete, profab economy flow intake tube, pcv reroute, fass titanium 150 lift pump, removed stock fuel filter assembly, lbz fuel pressure regulator, glowshift gauges, 2" lowering shackles, duramax tuner efi live[/I][/B]
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Old 04-24-2018, 06:29 AM
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The vanes will cycle which is normal. Maybe you are just hearing it more because the insulation and sound deadening are gone.
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05 LLY CC/SB
Roderiques ATV Built Motor, HSP Twins, NLX88/Danville72R,
S&S 200s, S&S 10mm & LBZ, Tuned by Danville Performance
Suncoast Competition trans and Goerend Converter
1125hp/1628lbft 10.52@132

Thanks to
Chris @ Roderiques ATV in Westport MA
Mark Broviak @ Danville
Joe and Dave @ HSPdiesel
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Old 04-24-2018, 08:01 AM
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I'm gonna guess you have an up-pipe gasket leaking.
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Old 04-27-2018, 09:47 AM
Yuptown_lly Yuptown_lly is offline
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I believe a boost leak is the culprit, when it's making the constant spool noise and I let off I hear it blowing off over towards the passenger side under the hood. I will have to check the intercooler pipes and up pipes to see if they are leaking anywhere. Blowing the lower pass side intercooler pipe when I test drove it could have cut the boot I suppose, it's strange how it comes and goes though
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2005 2500hd crew cab short bed lt
5" mbrp exhaust, 3" mbrp downpipe, s&b intake, Rudy's diesel turbo inlet, egr delete, profab economy flow intake tube, pcv reroute, fass titanium 150 lift pump, removed stock fuel filter assembly, lbz fuel pressure regulator, glowshift gauges, 2" lowering shackles, duramax tuner efi live[/I][/B]
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Old 04-27-2018, 11:11 AM
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I will guess the hot side 90 , those noises can drive ya crazy ! Good luck !
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