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Re: Who gets smoke when you boots?
disable the fuel by removing the ecu fuse so you DONT spray fuel all over the place ::)
your supposed to keep cranking it at wot untill the needle stops moving |
Re: Who gets smoke when you boots?
oic, well i believe its correct at 150. I think i have to be careful with boost now. >:(
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Re: Who gets smoke when you boots?
Take out your pcv and put it on your turbo inlet. That is the one thing air filters are good for- creating a slight vacuum on your turbo inlet. Run a big fatty hose from your former pcv down to turbo inlet. Pressure in the crankcase fucks up oil return, ring seating, turbo seal function, turbo lubrication, makes your oil cap start leaking...
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Re: Who gets smoke when you boots?
Originally Posted by jhmcrx
disable the fuel by removing the ecu fuse so you DONT spray fuel all over the place ::)
your supposed to keep cranking it at wot untill the needle stops moving |
Re: Who gets smoke when you boots?
Originally Posted by Spenser
Originally Posted by jhmcrx
disable the fuel by removing the ecu fuse so you DONT spray fuel all over the place ::)
your supposed to keep cranking it at wot untill the needle stops moving ill bet -100% they change. also, the car should be at full operating temp, no ecu fuse installed, WOT you didnt do the compression test correctly. |
Re: Who gets smoke when you boots?
FooK's right - the entire point of a compression test is to see how much the engine compresses air when it's at TDC. However, with the throttle plate closed, all the air that's going into the engine has to get sucked past the idle air bypass orifice in the TB, creating significantly less pressure in both the intake manifold and combustion chamber. Think about what the pressure is in your intake manifold when you're idling at 600rpm with the throttle closed. Granted, cranking is only 200-300rpm, but you're still operating with a hell of a lot of vacuum in there @ 200rpm - more than enough to skew the results.
The correct way to do the test is to bring the engine up to operating temperature, disable fuel by either unplugging all your injectors, the ecu fuse, or however you want, and block the throttle open - THEN crank it over and watch the compression. |
Re: Who gets smoke when you boots?
oh, and i get lots of smoke when i boost...its just from the tires tho ;)
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Re: Who gets smoke when you boots?
Originally Posted by ThingyNess
FooK's right - the entire point of a compression test is to see how much the engine compresses air when it's at TDC. However, with the throttle plate closed, all the air that's going into the engine has to get sucked past the idle air bypass orifice in the TB, creating significantly less pressure in both the intake manifold and combustion chamber. Think about what the pressure is in your intake manifold when you're idling at 600rpm with the throttle closed. Granted, cranking is only 200-300rpm, but you're still operating with a hell of a lot of vacuum in there @ 200rpm - more than enough to skew the results.
The correct way to do the test is to bring the engine up to operating temperature, disable fuel by either unplugging all your injectors, the ecu fuse, or however you want, and block the throttle open - THEN crank it over and watch the compression. |
Re: Who gets smoke when you boots?
Originally Posted by FooK
Originally Posted by Spenser
Originally Posted by jhmcrx
disable the fuel by removing the ecu fuse so you DONT spray fuel all over the place ::)
your supposed to keep cranking it at wot untill the needle stops moving ill bet -100% they change. also, the car should be at full operating temp, no ecu fuse installed, WOT you didnt do the compression test correctly. |
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