B16B safe RPM limit ?


now that i have my 9 i can say that on stock ecu, i change at 8700 k for optimal gear gear change point
 
Good thread, I have been changing at only 8k, not having had a Honda before I didnt want to push it that far, but with these MF gears it only drops 1k. Using a Spoon ecu & reving higher on track all day would you upgrade any parts or is it ok?
 
haitch said:
Good thread, I have been changing at only 8k, not having had a Honda before I didnt want to push it that far, but with these MF gears it only drops 1k. Using a Spoon ecu & reving higher on track all day would you upgrade any parts or is it ok?
Click to expand...

lol... just take it to the redline... didn't you see that K20A CTR @ redline in 6th gear @ 260-270kmphs for about a good minute?
 
i m using JDM b18cr ecu for my 16a build up and from the cluster, it revs up until 9k before cut off.

During tuning session on dynojet, the machine was rev up till cut off (9k) but from the dyno graph shown, the cut off was at 8.5k, seems like it has a tolerance of +-500rpm

so I was wondering.. is the rev limit was referred to the tachometer or the rev recorded on the dyno chart?

some ppl told me, the stock rs ratio for b16a can handle up to 9k safely, just curios which 9k shoud we reffered to, the one on cluster or the one on the dyno chart.

cheers
 
Mine revs to 9.600 :shocked:

I just want to contact the prevopus owner... i want to know, what he did with the engine... because iam a little bit scared and iam shifting at around 9000rpm...
 
your tach is no relevance to how many rpms your engine is turning. The RPM on the tach is only a signal from the ecu, somtiems weaker and older clusters tend to be off, its not -+500, its a % off.


My stock Ek9 ECU turns to 8600 on the dot, my cluster reads 9000ish
Take it to a dyno to really tell how high its turning.
 
turbociv910 said:
your tach is no relevance to how many rpms your engine is turning. The RPM on the tach is only a signal from the ecu, somtiems weaker and older clusters tend to be off, its not -+500, its a % off.


My stock Ek9 ECU turns to 8600 on the dot, my cluster reads 9000ish
Take it to a dyno to really tell how high its turning.
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correct! mine is off about 200 rpm on lower revs and gets progressively worse as i get higher in the rpm band, by redline my tach is off by as much as 600rpm :angry:
 
Ok, so after reading this whole thread.
I now want an accurate reading. What do I need to do?
 
Bon87 said:
Ok, so after reading this whole thread.
I now want an accurate reading. What do I need to do?
Click to expand...

Bon87,
I use apexi rsm and it seems to give quite accurate reading,(when tachometer at 3k, rsm +-between 2960~3020 rpm and at nearly 9k just before cuts off, 8950~8990rpm. I guess the rsm is also inaccurate too :secret:

blinx9900,
can i assume that the actual rpm we need to refer is the one of the dyno chart? if thats the case, from dynochart, my max rpm before cuts off is at 8.5k (where in actual cluster 9k) and the power is still climbing. Thinking to shift the rpm to 9.5k on cluster then and retune.
 
B16A2R said:
blinx9900,
can i assume that the actual rpm we need to refer is the one of the dyno chart? if thats the case, from dynochart, my max rpm before cuts off is at 8.5k (where in actual cluster 9k) and the power is still climbing. Thinking to shift the rpm to 9.5k on cluster then and retune.
Click to expand...

exactly, i use an aem serial data gauge that reads RPM but the dyno is the accurate one :nice: nothing wrong wtih going to 9k (on the dyno) if it still makes power and has the mods for it.
 
i think the my actual meter doesnt accurate... my stock year99 b16b stock and original ecu, Vtec activate at 6200rpm in my meter, speed cut at 200kph... sometime i shift at 8200rpm, it drop below the vtec point... so it need few second to rev up again to open vtec again..
Wat the actual vtec engage point for b16b actually?? i heard is 5800rpm.
And the ek9 gearbox ratio is design to stay within the Vtec point rit? when we shift at 8200rpm or above? it shouldnt drop below the vtec point rit?
 
have you tried to hit your revlimiter to see what the tach reads? when my car was stock with stock ecu i had to shift perfectly at 8400rpm to stay in vtec...
 
Stock EK9 VTEC point: 5,920~6,160 rpm

I have found when compared to dynos and various parallel engine speed meter attached to the ECUs like RSM and the like that inaccurate readings tend to happen with Civic tachometers. Especially when past 7800 rpm and towards the redline. The DC2 Integra meters tend to be a little inaccurate between 3000 and 4500 rpm but varies. Towards the redline its almost spot on...well at least mine is..I still can't figure out why. My DC2 runs a stock ECU and cuts off at exactly 8600 rpm.

I don't know about others here but I have found that APEXi Power FC Commander readings to be quite spot on.

Any comments?
 
As said, my rev counter shows almost 8800 rpm before the limiter comes on... however, i have a defi rev on display rev counter plugged straight into the ecu, and it shows 8500 rpm exactly before cutting out :)
 
tecque said:
i think the my actual meter doesnt accurate... my stock year99 b16b stock and original ecu, Vtec activate at 6200rpm in my meter, speed cut at 200kph... sometime i shift at 8200rpm, it drop below the vtec point... so it need few second to rev up again to open vtec again..
Wat the actual vtec engage point for b16b actually?? i heard is 5800rpm.
And the ek9 gearbox ratio is design to stay within the Vtec point rit? when we shift at 8200rpm or above? it shouldnt drop below the vtec point rit?
Click to expand...


vtec-6k

rev limit 8600.

to stay in vtec, you must come near redline between shifts.
 
is it normal for the b16b that the car is a little bit slow between 5700 and 6500rpm? mine just kicks asses after 7000rpm :secret: normal?
 
well it should kick ass after vtec but mine too seemed to have a bit more jump after 7k
 
If you type b16b specs on google you will get this info
HP/Torque: 185hp@8200/118lb-ft@7500
Redline: 9000 rpm

This means... You get your peak HP @ 8200, and you get your peak torque @ 7500... CONCLUSION: no point to go beyond 8200 cause theres no more HP gain... However the b16b redline aka cutoff is at 9000 THIS IS the safe RPM limit stock.
 
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