Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

Power pulse

  • Please log in to reply
2 replies to this topic

#1 Guest_subist_*

  • Guests

Posted 08 August 2003 - 01:46 AM


I've got a 92 Gt legacy turbo. I recently found that the outlet for the tubro boost controller solenoiud vale had been deliberately blocked up! I cleared it & now the car boost much harder BUT the power pulses baldly, especailly if you put your foot down! What may cause the power to fluctuate quite badly (while maintaining fairly high boost)? It tends to pulse less when you only put your foot halfway down. maybe the knock sensor? I've put in higher octane fuel (98 instead of 96) & it made no difference.
Thanks for your help.


#2 Guest_Legacy777_*

  • Guests

Posted 08 August 2003 - 06:30 AM


may want to check out <a href="http://www.bbs.legacycentral.org" target="top">legacy central bbs</a>

Alot more turbo owners over there, which can probably help if you can't find an answer here.

#3 Guest_Strakes_*

  • Guests

Posted 09 August 2003 - 08:47 PM

The car is designed so that the turbo doesn't overboost the engine. If overboost is sensed, then the fuel cutoff kicks in, temporarily shutting the car down...but since you back off the gas, the car starts up again. It's kind of like the fuel cutoff at redline. Since the overboost controller valve has been deliberately plugged, then I bet someone was trying to circumvent this feature in order to gain more performance/boost, or there was a problem with this overboost controller and they couldn't afford to replace it. Anyway, diagnosing and then correcting the problem may be a long and drawn out procedure. I had a similar situation on a turbo-charged car that I used to own. The previous owner had made an elaborate system of wires and vacuum hoses to get more boost. I spent a long time chasing it down (un-doing the tangled mess) and I finally gave up. I then paid a mechanic to fix it...and it took him about 2 hours.

Ask the guys on legacy central bbs...like Josh said. They might have a solution that's better.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users