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change from 3" to 4"?

Old 02-28-2010, 10:04 AM
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hello guys!



Last year i dynoed my car at 23psi and made 529rwhp with a t78 powered full bridgeport engine.



at that point i thougt the backpressure became to high, the EGT's began to rise, and couldnt get the boost higher. i'm running a 3" exhaust, with 2 mufflers and the wastegate welded in to the downpipe..



soooo.... would i see more power(at hte same boost), and faster spoolup with a 4inch exhaust?



regards,stig
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Old 02-28-2010, 06:52 PM
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You will see a lot faster spool up. Chances are the top end( past 5.5K rpms) will pickup at least 25rwhp in your setup( half bridge at those power levels), especially since your w/g is rerouted...
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Old 03-01-2010, 12:26 AM
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thanks!



i think I'll got this route, not for the power, but to get the temperature down, and get my EGT's under better control.. things are getting hot under the bonnet



a faster spool in not bad either, and i would probably change the LIM to a xcessive manifold to get even EGT's and flow at the same time, then its dyno-time again love the Dynapack, a friend of mine got one, so have free dyno-sessions
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Old 10-18-2011, 09:33 PM
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whats the ideal egt range..
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