New exhaust. Now tune the carb?
05-19-2004, 01:31 AM
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New exhaust. Now tune the carb?
I was thinkin about this today as i watched my new exhaust system being put in. I had the stock system w/a single cat. Now I have true duals 2 1/4" tubes and flowmaster 40delta flows. Will this huge change of flow lead to the need to re-tune the carb?
05-19-2004, 01:56 AM
#2
Team Owner
Re: New exhaust. Now tune the carb? (75_STINGRAY)
i'd drive it a little, put a set of plugs in it and drive it for a week and get a plug
reading. it may just need vary small adjustments.
reading. it may just need vary small adjustments.
05-19-2004, 09:37 AM
#3
Re: New exhaust. Now tune the carb? (75_STINGRAY)
Read these:
http://www.corvettefaq.com/c3/QJet_Tuning_Paper.doc
http://www.73-87.com/7387garage/garage_drivetrain.htm under air & fuel delivery
:cheers:
http://www.corvettefaq.com/c3/QJet_Tuning_Paper.doc
http://www.73-87.com/7387garage/garage_drivetrain.htm under air & fuel delivery
:cheers:
05-19-2004, 12:00 PM
#5
Team Owner
Re: New exhaust. Now tune the carb? (Boofers)
quoting from the referenced paper:
Better flow of gases out of the car means more air goes in, so you might be running lean unless you rejet richer. :)
If you have a stock engine, always start with the stock jet size and work from there. If you have the typical street modifications like headers, good exhaust system and a free-flowing intake, you can start with a main jet size 2 sizes larger than stock.
05-19-2004, 02:13 PM
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Re: New exhaust. Now tune the carb? (cw823)
cw823: I got the headers from ebay and the Flowmasters used (but in great condition) from a forum member for CHEAP! It sounds way better than the stock system!
05-26-2004, 02:31 PM
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Re: New exhaust. Now tune the carb? (cw823)
know which model Flowmaster series 40? I need to pick up a pair and replace the stock mufflers (= suck)
Yeah. They are Flowmaster 40 Series Delta Flows. They sound great! :party:
I went with 2.25" piping (only because the shop was out of 2.5"). I would recommend just replacing the whole system if you can. Good luck!