no boost???

SON240sx Automotive
1

hey i recently installed a new turbo on my SR and all of a sudden it wont boost over 0 it has 20 VAC at idle and runs smooth but when i give it gas when driving i get no boost but when i shut off the car i can hear the turbo spining still and i took off the intake side and the shaft had very little to no play and spun freely any ideas on what my issue is??

thanx
dan

2

So everything is the same except diff turbo and now no spooling? Has it been like this since the first time you installed the new turbo? Did you double check all the connections that you undid to install the new turbo, maybe you forgot to tighten a clamp and have a huge boost leak.

3

check all your vaccume lines and even your gauge wiring … could be waste gate acuator… you said you hear the turbo spooling when you shut off the car still… could that possibly be your fan or even if it is your turbo then im sure its nothing major
ps. gannngstar motor ! lol bt. s14 all the way

4

Im going to bet you wastgate is staying open

5

my buddie brians talon had the same problem, looks like your running all motor bro! lol

6

no boost???

I have the same problem…

7

When you changed the turbo did you replace the gasket between the turbo and the manifold ?

If that gasket is gone/not sealed then it will leak damn near all the exhaust out before it enters the turbo = no boost…

But if not that, then what Benson said.

8

you good with the vac lines… but the gauges?

lolwtfmate.

GT

9

well there is still a vac line going to the gauge, it never hurts to check everything…

10

hey thanx for all the positive info guys
i did replace the gaskets from the manifold to the turbo and all vac lines are good i have the best vac reading i ever had and my buddie was guessing wastegate but i wanted to check this out so thanx i’m goin to test that tomorrow

thanx alot
dan

11

hey aite i tried pluging the line to the wastegate and leaving no vacume line on the wastegate (someone told me to try this) and ran the car and tried reving it up in nutral and still no boost andwhen i shut off the car the turbo spining down kinda sounds like a grinding but not sure even when i first had it on it was like a highpitched noise when the car was turned off and the turbo was still spining just wondering what i should check next

thanx
dan