S13 RB25DET question..

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Jan 20, 2004 | 04:23 AM

#21 (permalink)

Enthalpy

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Quote:

Originally posted by j99jm
It's just I havn't really seen many people running anything faster than high 12's without a rebuild, while there are mildly upgraded RB25 S13's running 11's and even high 10's on the factory block

there are plenty of people out there running mid 10's to mid 11's on stock block SR's. they jst arent attention whores like the ricers on other websites.

Jan 20, 2004 | 08:03 AM

#22 (permalink)

j99jm

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Well I guess I was just confused about the potential of each motor... From what i've been reading, the RB sounded like the better choice because it was much easier to get hp out of. But if that isn't the case, and it would be safe and easy to make 400rwhp on the lighter SR then that seems like the way to go. However, If I can rebuild the KA and achieve my hp goals with a usable torque curve then I might just do that. I guess I just still have some research to do and some questions to ask....

Jan 20, 2004 | 08:08 AM

#23 (permalink)

j99jm

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Also, the SR has an aluminum block while the KA is iron correct? Does anyone know off the top of their head which head flows better from the factory, the SR or KA? (don't want to start another SR vs KA battle, just looking for specific facts

) And is the RB an iron block?

Jan 20, 2004 | 10:25 AM

#24 (permalink)

Slash

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SR flows better.. and the SR alum block has produced and held well over 800rwhp in japan... so i'd say that the whole iron vs alum thing is just :ghey:

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Jan 20, 2004 | 02:02 PM

#25 (permalink)

TropikalSX

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Slash: Where did you here the SR outflows the KA head? It's been proven that the KA head flows more than the SR head (stock for stock). Total valve area is also bigger than SR's total valve area...

Jan 20, 2004 | 04:27 PM

#26 (permalink)

j99jm

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Yeah I've heard the same that's why I was asking... And I was just wondering about the block thing because of weight, I know the SR block is strong and it looks like that will be my choice. Thanks guys for all the help

Jan 21, 2004 | 05:48 AM

#27 (permalink)

j99jm

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Anyone know roughly the top speed of an SR with the factory speed limit removed?

Jan 21, 2004 | 05:50 AM

#28 (permalink)

The Kyle

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although the KA head flows marginally better than the SR head, the fact that its on top of a 2.4 liter block makes it less of a good thing compared to the SR head.

matt

Jan 21, 2004 | 06:34 AM

#29 (permalink)

Enthalpy

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Quote:

Originally posted by j99jm
Anyone know roughly the top speed of an SR with the factory speed limit removed?

depends on rev limit, HP level, and tire size. 245/45-16 tyres and 7750 RPM revlimit. theoretical top speed by gearing calculator is 186 MPH. and with around 450 whp you will get there!!!