Running very lean Pic

[talontsi98]

My car is running very lean. Has a hahn 16g turbo system with stock fuel. I had a cracked exhaust manifold and during install I also found a crack in turbine housing near wastegate flapper. Back to point. You can see it is running very lean in the pic below. What is the cause of this?

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[jongreene]

My guess would be running too much boost on the stock fuel system.

 

[talontsi98]

The previous owner was running 17 psi.

 

[Black91TSiAWD]

aka=too much

turn it down until you get the fuel for it, and pray he didnt beat it too bad.

 

[redline2k6]

I would have to agree with the guys ahead of me turn the boost down and you should be good to go!

 

[TurboStutr]

^^ Yep, what they said. No more than 14-15psi max until you get some fuel for it.

 

[SpiralOut]

14 psi is to high for a 16g on a stock fuel system too IMO. Try ten psi

 

[Black91TSiAWD]

yeah Id say 10-12 at the maximum, to be safe and what not. The hahn 16g I think comes with a 5psi wastegate actuator or optional 10psi. Try see what it runs just straight wastegate to boost source. If its 5 just make it 10, if its already 10 see how that feels. But either way, the most you should try to run on stock fuel is 12, in my opinion.

 

[talontsi98]

Comes standard with 10 psi spring. The one that came with the car is a 15-17 psi spring rate. I just ordered a 10 psi spring for the actuator from hahn.

 

[TALONTRAX]

The cracks in the manifold & turbine housing are exhaust leaks & could be part onf the lean problem - especially on the cylinder closest to where the mani crack was . . .

 

[gsxeclipse97]

yea a crack will do that my t25 was like that when i switched turbos.