5th gear boost surge 12psi-15psi

5000turbo · 04-28-2012, 01:24 PM

it holds at 18 1-3 15psi in 4th and then flexs between 12psi and 15psi in 5th, i'm not quite sure what it is... I don't think its a boost leak so idk? any ideas?

88A5TQ · 05-06-2012, 05:17 AM

Hey. I don't know squat about boost controllers but maybe you can set different values for different gears but I doubt it. I would start by checking all vacuum lines to and from the controller and wastegate and the wastegate diaphragm. Also maybe give greddy customer service a call. Another consideration might be that the Ecu is limiting boost somehow through the controller (idk?) because of a rise in intake/coolant temps. Does it behave like this even with the water/meth setup replenished?

Last recommendation: join motorgeek and repost these questions. EFI is the life-force for the majority of vehicles over there.

AudiQ5sleeper · 05-07-2012, 11:37 AM

Vacuum leak most likely. but use a fog machine to find that leak.

5000turbo · 05-12-2012, 08:12 AM

There is a hose that connects from the intercooler piping to the turbo inlet that is kinked.... possible issue/>

05-06-2012, 05:17 AM	#2
88A5TQ Audiworld Junior Member 1988 Audi 5000 Join Date: Sep 2009 Posts: 43	Hey. I don't know squat about boost controllers but maybe you can set different values for different gears but I doubt it. I would start by checking all vacuum lines to and from the controller and wastegate and the wastegate diaphragm. Also maybe give greddy customer service a call. Another consideration might be that the Ecu is limiting boost somehow through the controller (idk?) because of a rise in intake/coolant temps. Does it behave like this even with the water/meth setup replenished? Last recommendation: join motorgeek and repost these questions. EFI is the life-force for the majority of vehicles over there. __________________ 1988 Audi 5000 CS TQ 2.5" cat-back, K&N CAI, TAP, HDI EBC 18 psi, 034 shifter, AEM W/M, black leather/suede interior 1987 5000 tq parts car Last edited by 88A5TQ; 05-06-2012 at 05:42 AM.

05-12-2012, 08:12 AM	#4
5000turbo Audiworld Junior Member Garage is empty, add now Join Date: Apr 2012 Location: Minneapolis Posts: 17	There is a hose that connects from the intercooler piping to the turbo inlet that is kinked.... possible issue/> __________________ P&P K24 Turbo ARP Headstuds 1.9 bar Wastegate Spring 3“ custom down pipe 3" Magnaflow ABT cam Custom Intercooler MSD Ignition Megasquirt Fuel Injection MAC 11C 2.5 bar map Greddy Profect B boost controller (18 psi) Water-Meth Injection Bilstein HD Shocks and H&R Springs Rebuilt Front calipers, Hawks alround,SS Lines V- 8 Master Cyl and rear disc upgrade 93 V-8 Ft sway bar

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05-07-2012, 11:37 AM	#3
AudiQ5sleeper AudiWorld Member Garage is empty, add now Join Date: Apr 2012 Posts: 368	Vacuum leak most likely. but use a fog machine to find that leak.