NoPistons -Mazda Rx7 & Rx8 Rotary Forum

NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   Single Turbo Discussion (https://www.nopistons.com/single-turbo-discussion-13/)
-   -   change from 3" to 4"? (https://www.nopistons.com/single-turbo-discussion-13/change-3-4-a-73884/)

-stig- 02-28-2010 10:04 AM

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

1Revvin7 02-28-2010 06:52 PM

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...

-stig- 03-01-2010 12:26 AM

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 https://www.nopistons.com/forums/pub...IR#>/smile.gif



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 https://www.nopistons.com/forums/pub...IR#>/smile.gif love the Dynapack, a friend of mine got one, so have free dyno-sessions https://www.nopistons.com/forums/pub...IR#>/bigok.gif

amp 10-18-2011 09:33 PM

whats the ideal egt range..


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