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Weird MAP, BOOST leak? supercharged vette log pics inside

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Old Jul 29, 2010 | 08:47 AM
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Default Weird MAP, BOOST leak? supercharged vette log pics inside

hi there
still having this problem i cant figure out.



The Map values should be straight line but it isnt. I have changed to procharger race blow off, put bigger pulley with new belt on, pressurised the system, but didnt find any major leaks. The system bleeds off quicly though.
I dont know what else to check...


The car has A&A vortech kit, 317 heads, blower cam, headers...
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Old Jul 29, 2010 | 09:14 AM
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Doesn't look that bad really. Sampling rate for the map plus there are pulses as the air switches which cyl it is going into etc.

Voltage isn't rock steady. Looks normal but this will also affect all readings.

If you are using an air compressor to pressure test it, things will bleed off quick. Past the rings etc. High pressure but fairly low volume compared to a charger.
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Old Jul 29, 2010 | 09:22 AM
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Originally Posted by Gabbiani
Doesn't look that bad really. Sampling rate for the map plus there are pulses as the air switches which cyl it is going into etc.

Voltage isn't rock steady. Looks normal but this will also affect all readings.

If you are using an air compressor to pressure test it, things will bleed off quick. Past the rings etc. High pressure but fairly low volume compared to a charger.
Maybe in this log is not that bad, cause its 3th gear pull, i guess its little worst in 4th. Please also notice my IDC, i have boost referenced FPR and it should be like straight line as well?
My friend thinks that it may be leaky intake valves?
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