Low turbo boost

Spudboy · 05-25-2007, 06:00 AM

1988 turbo supra. Seems like I'm not getting the turbo boost I should.
When it kicks in the gauge goes to about +1 max. (no boost at -4, needle only will reach +1 when floored) This stock gauge of course goes to +8.

I found cracks in the turbo inlet pipe. Replaced with nice steel one and put on a K&N filter kit. All other in/out hoses seem in good shape.

What could be the problem?

IHateHacks · 05-25-2007, 12:11 PM

Fuck that stock gauge. It's inaccurate and unreliable at best.

Go buy yourself a quality (about $50) mechanical boost gauge. That is a gauge that has no sending unit, you just connect a vacuum line straight to the back of the gauge.

If you still only register 1psi with a mechanical gauge, and you say you have no vacuum/boost leaks, then your turbo might be shiting a brick in the near future.

05-25-2007, 06:00 AM	#1
Spudboy 3" Exhaust Join Date: May 2006 Location: So. Cal Mountains Posts: 178	Low turbo boost 1988 turbo supra. Seems like I'm not getting the turbo boost I should. When it kicks in the gauge goes to about +1 max. (no boost at -4, needle only will reach +1 when floored) This stock gauge of course goes to +8. I found cracks in the turbo inlet pipe. Replaced with nice steel one and put on a K&N filter kit. All other in/out hoses seem in good shape. What could be the problem?

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05-25-2007, 12:11 PM	#2
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Fuck that stock gauge. It's inaccurate and unreliable at best. Go buy yourself a quality (about $50) mechanical boost gauge. That is a gauge that has no sending unit, you just connect a vacuum line straight to the back of the gauge. If you still only register 1psi with a mechanical gauge, and you say you have no vacuum/boost leaks, then your turbo might be shiting a brick in the near future.