2nd Generation Specific 1986-1992 Discussion

Turbo Isn't Boosting Properly

Thread Tools
 
Search this Thread
 
Old Jul 28, 2003 | 12:37 AM
  #1  
rmaiersg's Avatar
Thread Starter
Senior Member
 
Joined: Aug 2002
Posts: 811
From: One hour north of chicago (Mundelein to be exact)
Default

Okay so I finished the FMIC. While cruising i noticed that the turbo boosted like 10 psi but after a few seconds it dropped to 8. What's up with that? It needs a rebuild soon. But before the FMIC it was making like 10-15 psi.
Old Jul 28, 2003 | 12:55 AM
  #2  
Leetheslacker's Avatar
Senior Member
 
Joined: Nov 2002
Posts: 2,286
From: Cincinnati, Oh hi hoe!
Default

Gotta leak somewhere?
Old Jul 28, 2003 | 01:24 AM
  #3  
FrestyleFC3S's Avatar
Senior Member
 
Joined: Apr 2003
Posts: 2,259
From: Schofield Barracks, HI
Default

lee...gotta means got to....got a means have a



get it right



and yea it sounds like it could be a leak somewhere but thats weird to go up and then down



btw ---- you have any news on that short shifter i asked about a whileeee ago
Old Jul 28, 2003 | 01:58 AM
  #4  
1Revvin7's Avatar
Senior Member
 
Joined: Oct 2001
Posts: 10,906
From: Peoria, AZ
Default

Up and Down indicates a boost leak.
Old Jul 28, 2003 | 02:26 PM
  #5  
rmaiersg's Avatar
Thread Starter
Senior Member
 
Joined: Aug 2002
Posts: 811
From: One hour north of chicago (Mundelein to be exact)
Default

Okay, I shall inspect the tubing this evening.



Thanks
Old Jul 28, 2003 | 02:28 PM
  #6  
vosko's Avatar
Super Moderator
 
Joined: Jul 2001
Posts: 17,839
From: NJ
Default

you will notice pressure drop from your FMIC in other words. turbo puts out 10 psi but when it gets to the manifold you are down to 6-8 psi..... it doesn't matter on large turbos but the top mount was there for a reason no pressure drop
Old Jul 28, 2003 | 03:05 PM
  #7  
UniqueTII's Avatar
Senior Member
 
Joined: Nov 2001
Posts: 4,775
From: Ames, IA
Default

Yeah, the stock turbo can't fill up a larger IC very well.
Old Jul 28, 2003 | 04:05 PM
  #8  
j9fd3s's Avatar
Senior Member
 
Joined: May 2002
Posts: 22,465
From: California
Default

yah if it had a boost leak and the stock ecu it woudnt idle either, i like voskos answer



mike
Old Jul 28, 2003 | 06:27 PM
  #9  
rmaiersg's Avatar
Thread Starter
Senior Member
 
Joined: Aug 2002
Posts: 811
From: One hour north of chicago (Mundelein to be exact)
Default

That makes more sense. The air is cooler so it has less pressure correct?
Old Jul 28, 2003 | 06:43 PM
  #10  
vosko's Avatar
Super Moderator
 
Joined: Jul 2001
Posts: 17,839
From: NJ
Default

actually colder air is denser so it would have more pressure



All times are GMT -5. The time now is 12:41 AM.