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Old 10-27-2010, 12:15 PM
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Help with ProJectionIII

I installed a Projection III Fuel Inj. system on a 502 BB Chevy and have driveability issues with it. If I get it so it cruise nicely, it spits & sputters when I nail it. If I get it ti stop spitting then the driveability suffers with bad surging. Anyone have experience with this kind of setup?

Thanks,

hughj

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Old 10-27-2010, 01:00 PM
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We had an original ProJection unit in the family about 17 years ago. It was awesomely good. CA smog didn't like it much, but it ran like a champ with the closed loop system. I am sure your system is much more sophisticated, but I do wonder if the system still has some cam timing limitations. With the one we had, the cam timing needed to be in a range I'd call mild street. I don't recall the exact limits, but I do suggest you check your documentation and compare any limitations with the cam timing your engine has. Also, check for vacuum leaks, and verify that you are using manifold or ported timing as recommended by Holley. It seems that any of these variables might cause such a problem.

Pat
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Old 10-27-2010, 05:01 PM
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Thanks, Pat. I do have the cam at the mild street setting and I am running a centrifugal advance (no ported vacuum). I think my problem comes from not understanding the map readings vs fuel with the individual cells I can program into it but I'm not sure.
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