NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   S4 And S5 Turbos (https://www.nopistons.com/2nd-generation-specific-17/s4-s5-turbos-12631/)

rmaiersg 02-20-2003 05:28 PM
What's the difference between the s4 and s5 turbos if any?



Thanks



Robert Maier

Rotaryman88 02-20-2003 05:33 PM
There is a dif in the turbo, but I dont remember the exact terminology as to what...the s5 manifolds use a twin scroll design though, which the s4s don't. The s5 turbo & manifold is an upgrade from the s4, so if you have one laying around, you could swap it....

j9fd3s 02-20-2003 05:37 PM
the 89 has a larger wastegate, and a better exhaust manifold design



mike

rmaiersg 02-20-2003 05:54 PM
If i were to run about 10 psi would i need to port the wastegate? How much pressure can the s5 turbo make with the ported wastegate efficiently?



Thanks again

1Revvin7 02-20-2003 05:59 PM
Originally Posted by Rotaryman88' date='Feb 20 2003, 06:33 PM
There is a dif in the turbo, but I dont remember the exact terminology as to what...the s5 manifolds use a twin scroll design though, which the s4s don't. The s5 turbo & manifold is an upgrade from the s4, so if you have one laying around, you could swap it....
Isn't that backwards, s4= twin scroll?

1Revvin7 02-20-2003 06:00 PM
Originally Posted by rmaiersg' date='Feb 20 2003, 06:54 PM
If i were to run about 10 psi would i need to port the wastegate? How much pressure can the s5 turbo make with the ported wastegate efficiently?



Thanks again
yes if you run 10psi you should port the wg, i think it can control like 8 psi w/o being ported.

Rotaryman88 02-20-2003 06:53 PM
Honestly, I can't remember...I THOUGHT s5s were twin scroll...could be wrong, either way...the s5 is better,lol.

ILUVMY88CABRIO 02-20-2003 07:40 PM
S4 has the twin scroll.

Rotaryman88 02-20-2003 07:48 PM
Thank u :bigok:

1Revvin7 02-20-2003 07:49 PM
Originally Posted by j9fd3s' date='Feb 20 2003, 06:37 PM
the 89 has a larger wastegate, and a better exhaust manifold design



mike
dual wg ports also! s5 is better in everyway!


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