Subaru Enthusiasts Car Club of the Sierras - View Single Post

bluestreak · 2009-12-01, 01:30 PM

Coming back from Thanksgiving in Cali on Saturday over the 80 my car started to have some strange boost fluctuations. It was in 4th and 5 gear - it could hold steady boost to about 7 psi and then after that it would vary rapidly from about 6 to about 18 psi when at partial throttle. At WOT, it varied from about 14 to 18 psi. I was near Squaw and put some gas in (taking it from below 1/4 tank to a bit over 1/2 of a tank); after I added the gas, the problem nearly went away. It was still not holding completely stable boost, but it was much better.

I had a similar problem before when my original turbo went out, but having a more full tank did not help it...

I was thinking fuel filter or pump, but before I start replacing things I wanted to see if anyone had some advise.

As for the car's setup: Cobb stage 2 (ACN 91 OTC map), catless uppipe/dp, Borla Hush exhaust, stock turbo, intercooler, and injectors - and a cobb intake (I know, I know... the whole intake deal, but I haven't gotten around to piecing together a stock snorkus setup since I ditched my FMIC setup)

2009-12-01, 01:30 PM	#1
bluestreak EJ22 Join Date: Feb 2009 Location: NW Reno Posts: 111 Car: 2003 WRX Sedan - Blue	Boost Fluctuations Coming back from Thanksgiving in Cali on Saturday over the 80 my car started to have some strange boost fluctuations. It was in 4th and 5 gear - it could hold steady boost to about 7 psi and then after that it would vary rapidly from about 6 to about 18 psi when at partial throttle. At WOT, it varied from about 14 to 18 psi. I was near Squaw and put some gas in (taking it from below 1/4 tank to a bit over 1/2 of a tank); after I added the gas, the problem nearly went away. It was still not holding completely stable boost, but it was much better. I had a similar problem before when my original turbo went out, but having a more full tank did not help it... I was thinking fuel filter or pump, but before I start replacing things I wanted to see if anyone had some advise. As for the car's setup: Cobb stage 2 (ACN 91 OTC map), catless uppipe/dp, Borla Hush exhaust, stock turbo, intercooler, and injectors - and a cobb intake (I know, I know... the whole intake deal, but I haven't gotten around to piecing together a stock snorkus setup since I ditched my FMIC setup)