B16B safe Vtec engagement point?


H

hdk

B16B Powered :D
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Dec 21, 2007
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After reading the tread about the b16b safe rpm limit.
Just out of curiosity, running in a stock ecu setup or repro, whats the safe vtec engagement point at long term.
I got mine set with the apexi neo at 5400rpm, with vtec correction.
 
hdk said:
After reading the tread about the b16b safe rpm limit.
Just out of curiosity, running in a stock ecu setup or repro, whats the safe vtec engagement point at long term.
I got mine set with the apexi neo at 5400rpm, with vtec correction.
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If you have the correct oil pressure it should be safe to run vtec at any point, the real problem is that if you put it too low you will loose power instead of gaining :( .

Do you have access to a dyno ? Thats the correct way to find the best vtec point, in my old p28 chipped ecu I had the vtec point at 5900 RPM, the car produced more power + torque with the new ecu.

5400 RPM vtec point hmmm, for me it's just too low for a B16B :nice:
 
5400 is pretty low, when i was all motor, the car was happy at 5700-5800, with the turbo it likes it at 5400.
 
The best vtec point is the one set by Honda. Is useless trying to find "the best" vtec point my opinion. If your goal is to improve your performance from top to bottom then go for mods.......Altering vtec engagement is more like an "adjustment" rather than an improvment always talking about N/A....
 
any lower than 5700 i feel u loose out. i have just left mine std at about 5800
 
ManosEK9 said:
The best vtec point is the one set by Honda. Is useless trying to find "the best" vtec point my opinion. If your goal is to improve your performance from top to bottom then go for mods.......Altering vtec engagement is more like an "adjustment" rather than an improvment always talking about N/A....
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well, i agree, but once you add aftermarket cams, chaning the vtec crossover is sometimes a MUST. for example on crower stage 2 cams on a b18c ive seen as much as 24whp buy raising the vtec crossover to 6200rpm.

also things like raising the compression and porting the head may require a vtec change also.
 
blinx9900 said:
well, i agree, but once you add aftermarket cams, chaning the vtec crossover is sometimes a MUST. for example on crower stage 2 cams on a b18c ive seen as much as 24whp buy raising the vtec crossover to 6200rpm.

also things like raising the compression and porting the head may require a vtec change also.
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I was talking about 1.6......1.8 is surely a different story with more pull from bottom and potential with mods......raising vtec on a 1.6 you wait for a life to engage even with serious mods.
I decided to leave the same vtec point(6200) after some experimentations which were a dilemma on where to put it......At least altering vtec crossover was not a MUST to be done :)
Where the hell was vtec on that b18c and was raised to 6200 rpm? :wow:
 
i agree with the people saying that the VTEC point has been put there for a reason etc etc but what is the exact reason behind it being set at a certain point? is the engine and components not capable of handling (for example) the full 185 bhp all the way through the rev range.so essentially a constant VTEC cam profile?
is this not what you basically end up doing when you change cams on vehicles?

i understand that the vtec system gives you a good mix of two things.easy somewhat economical driving and also the crazy VTEC mode. but just an interesting convo maybe :)
 
AndyH said:
i agree with the people saying that the VTEC point has been put there for a reason etc etc but what is the exact reason behind it being set at a certain point? is the engine and components not capable of handling (for example) the full 185 bhp all the way through the rev range.so essentially a constant VTEC cam profile?
is this not what you basically end up doing when you change cams on vehicles?

i understand that the vtec system gives you a good mix of two things.easy somewhat economical driving and also the crazy VTEC mode. but just an interesting convo maybe :)
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v-tec works on engine speed engine temp and oil presour. so if u have v-tec comin in to low one of these factors aint going to be there i.e oil p there fore it wont be able to lift it onto the v-tec cam lobe properly. altho u will still get tec the performance wont be as good as it will when all the 3 factors are right
 
babyface said:
just curious on why your vtec is engaging at 5800, when the b16a2 engines are 5500
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maybe my rev counter is out but a few of my mates run a b16a engine and there v-tec comes in at 5700-5800 aswell
 
AndyH said:
but what is the exact reason behind it being set at a certain point? is the engine and components not capable of handling (for example) the full 185 bhp all the way through the rev range.so essentially a constant VTEC cam profile?
is this not what you basically end up doing when you change cams on vehicles?
Click to expand...

no no no, the point of vtec is to have good midrange/low end power and good top end as well. if you have a cam that makes peak power at 8500rpm it will NOT make good power down low, and if you have a cam that gives you 200tq at 3500rpm its not going to make any power up high. but with vtec you can cross the two much easier.

also you do NOT have 185bhp as soon as vtec kicks in.
 
B16B is supposed to make around 130 bhp just below vtec kick(6200 rpm) and 175 bhp in fractions of a second as soon as it kicks. Then another 10 bhp for the next 2000 rpm. What a technology!! :win:
 
blinx9900 said:
no no no, the point of vtec is to have good midrange/low end power and good top end as well. if you have a cam that makes peak power at 8500rpm it will NOT make good power down low, and if you have a cam that gives you 200tq at 3500rpm its not going to make any power up high. but with vtec you can cross the two much easier.
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thats what i always thought

blinx9900 said:
also you do NOT have 185bhp as soon as vtec kicks in.
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ye i know ;) not a complete noob! lol would be an incredible kick though if 185 did just kick in like that! lol
 
ManosEK9 said:
Thats true. B16A is 5800 rpm vtec and 8000 redline whereas B16B is 6200 rpm vtec and 8400 redline
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hmm ye mine vtec comes in at 5800rpm and redlines at 8500rpm on my clock thats a b16a2
 
lumek4 said:
hmm ye mine vtec comes in at 5800rpm and redlines at 8500rpm on my clock thats a b16a2
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Obviously there's something wrong here......:nerv: If you are 100% sure is a B16A2 it means that your actual redline is 8000 rpm, the clock is not an SiR clock and it doesn't say the truth for the redline, i.e. you are overreving your engine(don't ignore this).......On the other hand however, in case is a B16B and you are not aware of(you wish :p), it means the redline is true and your vtec was dropped to 5800 rpm from 6200. Is just one of the two, it cannot be both! :nice:
 
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