13G turbo's can't hold boost till redline - Page 7 - 3000GT/Stealth International Message Center
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Old 01-09-2017, 01:08 PM   #61 (permalink)
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Default Re: 13G turbo's can't hold boost till redline

It's a good video. There is absolutely no reason to have to do this on stock turbos for our cars though. There is no way a 9b exhaust blade can flow that much exhaust to cause this unless there is a defective wastegate or actuator.
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93 3000GT VR4 (Disguised as 97)
13g turbos
450 cc injectors w/hot wired walbro
Greddy emanage blue
Downpipe w/stock exhaust
AEM wide band
2-tone interior
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Old 01-11-2017, 07:59 AM   #62 (permalink)
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Default Re: 13G turbo's can't hold boost till redline

Theoretically, due to the inherently restrictive nature of the 13g/9b hot side exhaust housing - very small diameter, a free flow exhaust should be enough to cause boost creep, "Meh, that wastegate port is to tiny/restrictive, I will just continue through the compressor housing since there's no precat slowing me down"
I''m also guessing that a larger turbo's (15g/20t ) wastegate port is larger and better flowing.
That's my theory anyway.
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Built 2nd week of August 1992, 1993 Dodge Stealth R/T twin turbo (6g72 engine with stock TD04-9b turbochargers), pearl white exterior (W29), red leather interior, W5MG1 transaxle.

Mods from stock:
VMS Racing 10.2mm spark plug wires, NGK BKR6EIX-11 spark plugs gapped down to 0.32", Touren TR9 3190 wheels, Maximal high flow main catalytic converter, gutted/deleted precatalytic converters, front & rear slotted & drilled brake rotors from eBay, T-bolt stainless clamps, Curt trailer hitch, 2nd gen rear bumper aluminum reinforcement, LED backup & license plate bulbs, Pioneer AVH-X2500BT with backup camera, DSM SMICs converted by oohnoo, 3S warehouse sidemount oil cooler, EVO 8/9 blow off valve, EGR blockoff plates, Vented hood blister mod, Rebuilt stock throttle body, Stainless bolt kit, LCDBC as an ECU monitor, 3SX Stainless-Steel Braided Brake Lines, 3SX Door Sills, Koyo radiator with brackets, High speed cooling fan mod, Retractable license plate holder, 3SX rear control arms, Snake eye mod, SCE brake caliper stiffening bolts, Pilot WI-HL6A 4656 Head Lamp Conversion Kit, K&N oil filter, Free boost mod, Stant XACTSTAT #48217 thermostat
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Old 01-11-2017, 12:40 PM   #63 (permalink)
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Default Re: 13G turbo's can't hold boost till redline

My boost creep issue was pretension. I had to loosen pretension 6 full turns. I'm curious to see what yours ends up being.
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Old 01-11-2017, 02:51 PM   #64 (permalink)
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Default Re: 13G turbo's can't hold boost till redline

With winter in full swing here and my car up on jackstands, there will be no boost creep testing till end of march
My 9bs are untouched since factory install, I could reduce preload, it seems to be a bear to acess the rear adjuster.
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