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Old 03-10-2013, 03:12 PM
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exaust emmisions not right

i have a corvette with a 383 stroker engine, with all new edlebrock rpm performer top end including the carb. the car runs great. but the exaust will make your eyes burn from 10 ft away, but when i pulled the plugs they look nice, so i dont know if the carb can be out of adjustment . would anything else effect the exaust? makes no differance if air cleaner is on or off.

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Old 03-10-2013, 04:57 PM
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If the timing is correct with vacuum pod set up.

You want to analyze the emissions. Weld a o2 bung in the collector. First take manometer reading of the back pressure with a 10lb boost gauge and a thread adapter. If the Pressure doesn't exceed 2-2.5 psi the size is adequate. Then throw in your o2 sensor for some real tuning. It is the best way to get a good easy tune your confident with.

If your backpressure is not exceeding 2 psi upgrading to larger size pipe could hurt performance, and cost drivability due to lost velocity.
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Old 03-11-2013, 05:21 AM
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The Innovate wideband AFR gauge kit is about $200 on Amazon, and as a tuning aid its well worth the price. Its really hard to gauge lean vs. rich by the seat of your pants, even if you have a lot of experience. Using the gauge makes it a lot easier to know if rich/lean mixture is causing a problem.

Bruce
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Old 03-11-2013, 08:56 PM
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Usually a stinky exhaust on a cammed motor is lack of basic initial timing.
More spark advance at idle.
Needed to account for the slower fuel burn speed causeed by the EGR effect of the cams overlap.
(recycled exhaust gas)
The increased idle timing makes for faster combustion so the fuel gets burned in the chamber instead of in the exhaust pipe.
If you are using the Edelbrock Performer "RPM camshaft give it about 24-26deg timing at idle.
This requires recurving the distributor ( a 10degree mechanical advance curve)
Use a 4" rated power step up spring set.
Nothing else will help until you give the engine the proper amount of idle timing.

The increased idle timing fixes the problem.
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Old 03-12-2013, 11:38 AM
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Quote:
Originally Posted by spinn View Post
If the timing is correct with vacuum pod set up.

You want to analyze the emissions. Weld a o2 bung in the collector. First take manometer reading of the back pressure with a 10lb boost gauge and a thread adapter. If the Pressure doesn't exceed 2-2.5 psi the size is adequate. Then throw in your o2 sensor for some real tuning. It is the best way to get a good easy tune your confident with.

If your backpressure is not exceeding 2 psi upgrading to larger size pipe could hurt performance, and cost drivability due to lost velocity.
what tool would be used to read the o2 censor with? also f-bird do you hve any easy tricks to tuning ignition such as spinn's backyard fuel management effeciency tuner? that way i could set my timing for efficiency then set the carb? whats the best way to tune, ignition before fuel management or fuel management then timing?
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