B16B safe RPM limit ?


blinx9900 said:
stock cams stop making power at 8200-8400rpm no matter what you do. revving to 11 on stock cams would just slow the car down.
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And even if you upgrade your valvetrain for 11 rpm, again you will loose power because of cams. In general, I believe the EK9 cams have less potential than its pistons or Intake manifold. For example, by changing your ECU and your cams, you get a decent increase in power, whereas changing ECU and pistons, you get much less due to cams restrictions. EK4 with non - high compression pistons is a different story
 
I never said stock cams will take the car up to 11,000 rpm with plenty of power.

I said the engine in the video has stock valvetrain other than the Spoon block brace.
 
Is the forum's edit function broken? :/

Anyway, the test concluded that having extra rpms available greatly aided uphill climbing speed, without having to shift up, having the momentary powercut and dropping out of powerband.

Although you can raise the rev limiter on a stock B16B, the Spoon block brace makes it very safe to explore those higher rpms compared to stock - also a point of the video.
 
blinx still dosent believe that stock valvetrain can handle 11,000 rpm... ask any engine builder.
 
They didnt push it to 11,000 I think?. Tsuchiya stopped revving it at 10k IIRC, at which the engine was already pretty much out of breath. (Im having some problems with streaming to check it again)

If you take the power dip from 8500rpm onwards as an estimation, I can imagine that the power produced by said test engine at 10,000 rpms is about proportionately right. It took a while to get there and wasnt producing any meaningful power, it was just more convenient for an uphill run without having to lose momentum. I still strongly suspect revving it to those rpms in a straight line test would cause the car to be slower than stock.

Besides, block brace = greatly reduced vibration = greatly reduced parasitic losses at high rpms, which IMO reduces the drag which overcomes power at those rpms, a bit like the effect of having a racing crank pulley or light flywheel. Just a speculation though. :)

Anyway I just wanted to say that the engine in the video is most probably stock indeed with only the brace fitted. Spoon race engines rev up like crazy after all. As this wasnt the point of the original thread I think its not of much importance to bicker about it. :)
 
just to get an overall answer, i know the dials are not accurate, just want to know when the limiter cuts in, in ek9's!:) thanks
 
when i logged it with my aem ems before the tuning, it was 8600 fuel cut.
 
hmmm... interesting....
the reason i ask is on 'Type R legends', they say it redlines to nine quite easily.... could be inaccurate rev counter though..
 
if you use the spoon ecu on a 00 ek9 it raises the rev limit to 9100 rpm,is the stock ek9 valve train ok for this rev limit ?? or do you need to upgrade ??
 
Mine (standard B16B ecu) cuts at 8600rpm.

It was said that EK9 meters are very accurate.
 
I got a imported b16b, rev limit is set to 9200rpm and its been working fine so far :))
 
blinx9900 said:
the stock cluster is not accurate, mine shows 9200rpm when im really at 8500rpm, honda tach is not too accurate.
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700 rpm inaccurate?? Isn't too much?? Mine was hitting the stock 8400 rpm before arltering it and I had the impression that was revving high......
 
blinx9900 said:
probably, im not sure what part of the video your referring too.

the stock cluster is not accurate, mine shows 9200rpm when im really at 8500rpm, honda tach is not too accurate.
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I have ear the same but the Apexi confirms my 9200, if its a error or not only the gods know :D
 
there is no point in reving your car away out to 9k cos if im rite the ek9 cams make top power at 8400rpm. so if you are wanting to rev that high you really need cam's that can provid power at 9k. so i wouldnt put any more stress on the engine than u need to
 
My Power FC says my cluster is accurate too! :)

hmm, I remember seeing my car was still following through power on the dyno till 9krpm limit with stock cams. So I think its ok to rev till 9krpm. But everyone knows the b16b 1.8 Rod/stroke ratio is safe for 10,000rpm.
 
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