Vtec Engagement!

lol pclee - you still make no sense. My post was about the supposed "reliability" of dyno tuners and the fact that many operators make mods to your car and then dyno it to "prove" that the money that you just spent is worthwhile (BTW - In no way am I making this comment about Croydon, it's just I saw them do it for fun). How about YOU read before you post in future.

bizee: running rich means your car is not running optimally - VTEC cars do tend to run rich while they are on WOT to protect the motor from detonation - in your case the early activation may be affecting the AF ratio (this last is just a very uneducated guess).

vtec change over point varies from model to model as stated before ...

the 1st Gen b16a (EF8/9) kicks in at around 5200rpm
the 2nd Gen b16a2 kicks in around the 5500rpm
and so on ...

as for 7400rpm kick in ... theres gotta be something wrong with your ecu or engine to be doing that man ... if your vtec is kicking in at that point your redline must be around the 10-11k rpm mark to bother getting any power out of vtec ... and judging from your low knowledge on the subject I doubt you have a car capable of such efforts.

7400rpm sounds more like your redline
:roll:

EF9 is at 5400 using the stock ECU - this I know for fact (/me points to sig and avatar as proof). I don't know where the 5200 figure comes from.

mines been around the 5800 mark latly although it was 5500 a few days ago... Strange. I think it was 5500 again tonight, maybe its the pod instead of panel filter. stupid pods are too noisy!!!

yep - dunno if it'd make a difference or not to VTEC - but did you reset the ECU (pull the hazard fuse/battery terminals for 10 minutes)?

huh? reset the ECU for a filter change over? pull the fuse for 10 mins? I just take out the ECU back up and replace it strait away, that clears all the codes for me. well it has done when my knock sensor wasn't wired up properly :P

I do it for 10 to be on the safeside so that nothing is left residual. Old '80 comp mentality I guess :)

I found that the ECU needed a reset when I was testing pod vs cai vs panel. No idea why.

nobody answer me also ler...
always saying the same thing...
why higher not lower...why lower and not higher...
gimi some detail please..

its been answered about 5 times dude... read all the posts.

I even explained it in lamens turms for you :shock:

Not that i really understand what your asking clearly, but if your asking why you WOULD make it kick in later, because if your using more agressive Cams it might not be optimum to open them up at low RPM... with stock cams, theres not much point kicking them in higher.

If your asking why not to kick them in LOWER< well i along with about 8 other people have explained why... Opening up the VTEC cam is pointless unless you let in more fuel, and adjusting the VTEC point without adjusting the fuel map will result in JACK SH|T. Some people have altered theres but they have also altered the fuel map, they've done this by tuning the engine to its optimum, but usually honda engines are tuned fairly spot on for a STOCK engine.

Please if you still havn't had your question answered... consult an translator. No offence intended but we have answered your question... several times. SO you must be confusing what you mean to ask.

ok let me have a go to make it simple..

think about itr this way. your motor has 2 cams,

-cam 1 is the low rev cam which gives u peak power at around 2000-5000 rpm. which is good for low speed driving
-cam 2 high rev cam which gives u peak power at around 5000-7000 rpm. which is good for high speed racing. :D

each cam has its own peak.
to choose a vtec crossover point, you have to find the point inbetween the 2 because if u rev too high with cam 1 u would be losing power, and if you dont rev enough for cam2 it would be running worse that cam1.


I have heard of some people changing vtec point lower so when they change gear they can stay in vtec when the revs drop

hope that helps.
.

ohh...hahaha...i'm abit lagging...

Quote:

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Originally Posted by Setanta

EF9 is at 5400 using the stock ECU - this I know for fact (/me points to sig and avatar as proof). I don't know where the 5200 figure comes from.

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damn man ... mine is kicking in at 5000-5200rpm and my ecu is standard :?