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RX7Club.com - Mazda RX7 Forum (https://www.rx7club.com/)
-   Single Turbo RX-7's (https://www.rx7club.com/single-turbo-rx-7s-23/)
-   -   flow vs pressure (porting vs boost) (https://www.rx7club.com/single-turbo-rx-7s-23/flow-vs-pressure-porting-vs-boost-1107876/)

RGHTBrainDesign 11-30-16 11:38 AM
Originally Posted by JZG (Post 12128346)
You would think so but in my experience you are more likely to bend seals due to over heating as the turbine back pressure/boost ratio goes above 1:1. More overlap generally means richer mixtures are required to keep the apex seals under their critical temperature.
eMAP:MAP Ratio is always over 1:1 unless the exhaust is SUCKING... A really good system would be like 1.2:1. Anything over 1.5:1 needs exhaust/turbine housing modification/optimization.

JZG 11-30-16 01:50 PM
Originally Posted by SirLaughsALot (Post 12128436)
eMAP:MAP Ratio is always over 1:1 unless the exhaust is SUCKING... A really good system would be like 1.2:1. Anything over 1.5:1 needs exhaust/turbine housing modification/optimization.
I probably should have specified I'm referring to manifold gauge pressure, not absolute. Once turbine back pressure (gauge), is higher than inlet manifold pressure (gauge) there is a lot more intake charge dilution with hot exhaust gas. The more overlap the engine has, the more dilution takes place.

TitaniumTTRE 12-19-16 09:31 AM
Originally Posted by SirLaughsALot (Post 12128436)
eMAP:MAP Ratio is always over 1:1 unless the exhaust is SUCKING... A really good system would be like 1.2:1. Anything over 1.5:1 needs exhaust/turbine housing modification/optimization.
Stock REW twins from 0-10psi stayed around 1:1. From 10-15psi boost the ratio climbed to 2:1

Current setup stays VERY close to 1:1 all the way to the 26psi range

JzG is right on the money for everything that I have experienced as well


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