Not building boost
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I have a 5.3 swapped fairmont I'm trying to iron all the bugs out on.
Setup:
5.3
Z06 cam
ls1 intake
truck tb
on3 76mm
2.5 charge pipes
tial bov
ebay wastegate
Microsquirt V2 (Denmah base tune)
The car idles and drive great under 100kpa, but once it approaches that threshold it still won't make any boost.
I've tested for boost leaks, found one in my coupler, but tightened clamp and map will now see 20psi without any leaks.
I'm thinking I have an issue with either my wastegate or bov.
Anything else I should look into?
Setup:
5.3
Z06 cam
ls1 intake
truck tb
on3 76mm
2.5 charge pipes
tial bov
ebay wastegate
Microsquirt V2 (Denmah base tune)
The car idles and drive great under 100kpa, but once it approaches that threshold it still won't make any boost.
I've tested for boost leaks, found one in my coupler, but tightened clamp and map will now see 20psi without any leaks.
I'm thinking I have an issue with either my wastegate or bov.
Anything else I should look into?
#7
Trending Topics
#9
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
![](http://farm8.staticflickr.com/7385/10007676273_cfaa6cc088_z.jpg)
![](http://farm6.staticflickr.com/5463/10007666183_5263e62cff_z.jpg)
#10
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I have bypassed bov, capped wastegate, pressure tested for leaks, microsquirt sees 16psi under leak test but still no boost! What the heck!! Any other ideas before I replace this turbo?
#12
On The Tree
Join Date: Apr 2012
Location: Neenah, WI
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
When you clocked the turbo did you tighten the case back down? Also in that pic it sure looks like your wastegate valve is open, I can see daylight through it. Or am I just seeing things?
#13
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I tightened the turbo down after I clocked it, but maybe not tight enough? It will hold pressure when I test it with a boost leak tester
#14
On The Tree
Join Date: Apr 2012
Location: Neenah, WI
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I didn't go too tight with mine after I tightened it down, just enough. I didn't want to spin a thread going into soft aluminium housing. That's weird that you say the turbo sounds like it is zinging up when you get on the gas, I would assume that noise could only be made when forcing air through the turbo. Could you test the pressure by taking the charge pipe off of the throttle body and stuffing a rag in there and seeing if you can shoot it out by snapping the throttle? That's the easiest test I can think of at the moment to see if the turbo is working.
#18
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Cheapy ebay small intercooler
Exhaust is a pie wedged 3inch off the turbo into an old flowmaster knockoff
I will next time I have it out
#19
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Well, baby step forward.. I got it to build 3 psi.. but it was running stupid lean so I backed out... I bypassed all my intercooler piping and intercooler with a short piece of pipe going from turbo outlet straight to throttle body. turbo spools fast as hell now.
So.. blockage from intercooler, or turbo is junk and the short pipe is helping it spool?
Going to mess with it some more tomorrow
So.. blockage from intercooler, or turbo is junk and the short pipe is helping it spool?
Going to mess with it some more tomorrow