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na rotars in t2 Rate Topic: -----

#1 User is offline   wanglerrx7 

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Posted 02 March 2010 - 11:37 PM

just wondering if anyone has built a 13bt(S5) useing S5 NA rotars. If so how did it run? i assume you would just have to keep the boost low?
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#2 User is offline   Liborek 

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Posted 03 March 2010 - 03:05 PM

View Postwanglerrx7, on 02 March 2010 - 11:37 PM, said:

just wondering if anyone has built a 13bt(S5) useing S5 NA rotars. If so how did it run? i assume you would just have to keep the boost low?


Most RX-8 guys are boosting about 10 PSI on 10:1 compression, but also they are getting 330+ whp. If you consider that some people were reliably boosting over 20 PSI with 9:1 on pump gas(just over 500 whp), I donīt see any reason why you shouldnīt run resonable boost with 9.7:1 CR rotors. Just run less advance - less timing is always good - even when you loss a bit of power. Higher EGTs just mean that engine isnīt stressed with useless heat and pressure spike around TDC.

Most people will warn you about much smaller room for error but hey, strong enough detonation/preignition will destroy certain parts of engine no matter compression ratio...
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#3 User is offline   wanglerrx7 

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Posted 04 March 2010 - 08:24 PM

View PostLiborek, on 03 March 2010 - 03:05 PM, said:

Most RX-8 guys are boosting about 10 PSI on 10:1 compression, but also they are getting 330+ whp. If you consider that some people were reliably boosting over 20 PSI with 9:1 on pump gas(just over 500 whp), I donīt see any reason why you shouldnīt run resonable boost with 9.7:1 CR rotors. Just run less advance - less timing is always good - even when you loss a bit of power. Higher EGTs just mean that engine isnīt stressed with useless heat and pressure spike around TDC.

Most people will warn you about much smaller room for error but hey, strong enough detonation/preignition will destroy certain parts of engine no matter compression ratio...


yeah i kinda figured. i just have both turbo rotars and a set of NA rotars so i was just kicking ideas around in my head. i think im just gonna go with the turbo rotors.
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#4 User is offline   Maxt 

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Posted 04 March 2010 - 10:02 PM

Always use the lowest comp rotor you can with boost...
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#5 User is offline   j9fd3s 

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Posted 13 March 2010 - 02:32 PM

View PostMaxt, on 04 March 2010 - 10:02 PM, said:

Always use the lowest comp rotor you can with boost...


agreed. here in CA, we have really poor fuel quality. higher compression = such a compromised tune that you'd be lucky it runs, if it does it'll be down on power VS the stock rotors
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