i have a drag gen 3 turbo on my LS. i had to take apart and reassemble the downpipe, turbo and manifold due to loose bolts. i just finished putting it all back together and i have the car on jack stands. none of the wheels are touching the ground. i decided to test out the boost pressure and check from my gauge. will the car not being on the ground cause the car to not build any boost? reason is i just tried and the gauge does not read past 0 psi at all. im hoping there's not another problem with my turbo. i dont think i missed any reinstallation parts. i double checked to make sure everything was connected. so anyone with any experience on this, please help.

 

93
If I understand you correctly, you tried building boost by reving the car out with the wheels off the ground? A bit dangerous, but nonetheless, an engine needs to be under a load to expend the energy for a turbo to make positive boost pressure. They are not rpm dependant. A few cars might have made boost, but most would just go up to 0 psi or low vacuum.
93 93/93

 

ok, so even if the car is in gear but wheels are not on the ground, it wont build boost then. correct?

 

no the engine has to be under load to build positive boost pressure like he said above

 

thanks guys. i got worried for a little. i hope everything goes right from now on......