Aj's last post got me thinking about this. I've been told with a Mugen ECU you can rev to 9100 on stock internals. But what's the max rev that our b18c5 can handle.

 

I missed shifted, I was redlined in 4th and went to 3rd, I hit somewhere around 12k, and it didn't blow, but that was a one time thing. I have seen people go to 10k before.

 

Well...if you're talking about stock it's hard to say, you can rev it up to 10K or maybe even 11k all the time, but eventually it's gonna break something...it's more a matter of consistancy than a one time thing. I'd say your stock valve train will do 9K regularly without breaking, more than that, and you're pushing it.

If we're talking about after market, then I guess the sky's the limit, provided that you have an endless buget and a very good machine shop. For example, John at Ferrea says their head components will hold up to 12,300 rpm.

I guess more to the point, most cams won't make power past like 9500, some of the more radical ones up to like 10,800, but that's about it for street cams that make power anywhere else. So why beat on your car any more than necesary. Most of the companies I've talked to such as Rev and Ferrea all say that anything over like 9800 rpm will take its toll on your valve springs, and will at some point in time require replacement, though signs can be difficult to judge without removal. My rev limiter is set at 9700rpm for the moment.

Every one is going to have a different opinion about this one, but that's mine...

Later,
Aj

 

Also dyno your car. if it is not make power all the way to 10k or whatever there is no point going that high.

 

I'd say even if the power has dropped slightly past peak if it puts you in a higher point on the power curve by shifting later and losing a bit of power up top you are still picking up an advantage. This all depends on the amount of loss up top though.

Woudl have to agree 9,000 is a good stopping poiunt for stock parts and a dyno is needed to to know if that is useful. I rev my stock cams to 8800 and they plateau and then drop around 8000-8100. It is gradual so it is useful to rev past peak but not by much.

 

very good point...there is something to be said for pushing up the rpm some in order to stay in a higher power band...as for most cams, you'll still make more power even after the power curve starts leveling off or even dropping, then you will three or four thousand rpm lower in the rev range...

LaterZ,
Aj

 

Thanks for the responses. I was mostly referring to after market upgrades. Since the R is the great all motor platform i just wanted to know how high I could reasonibly expect to go. And 9700 to 10,000 is enough fo me.