VTEC crossover.....

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Originally Posted by VT3C

My JDM B16A (2) ALWAYS switches over at 5800.. Low load or full load...

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This cant be true. Hook up a test light in cabin and check it this way.
You'll see what i'm talking about.
Ive datalogged this many times also, so it is true. Low load & high load are in fact different.
There is also usually a discrepancy between actual activation & cluster rpm's!

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Originally Posted by VT3C

There is a good kick and noticable power spike on the RSM dyno graph thinghy when VTEC does engage. I think that whilst it FEELS like the non-VTEC cam is still gaining power, it is truely at it's peak power right as it switches profiles into VTEC.

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This sensation is because honda typically run the x-over point quite rich.
The Butt-dyno will sence power at this point becuase the transition between rich to lean will always generate HP.

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Originally Posted by VT3C

co-incidentally, my VTEC switch point at 5800 is VERY, VERY pronounced in relation to the change in audible engine note (the VTEC 'noise').. VTEC set lower on other B16A's i've seen is not as audible.. but that means absolutely nothing.. but it sounds nice and makes non-VTEC'ers look accross with the WTF look hahah.

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hehe, vtec rocks!

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Originally Posted by ProECU

OK
the story is the vehicle is tuned on both low cam only and again repeated for Vtec cam only.
Where the two torque curves intersect is the theoretical vtec x-over point.

All you guys who have 7k+ x-over are losing power.
I guarantee you the vtec lobe is making more power than the low lobe at that rpm.

Think about it, you only have an extra 1000rpm before redline, so whats the point of a 7200 rpm x-over?

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mine goes 10k++++++...hehe...so i got another 3000rpm+++++ to play with...hehehe..but the problem is...i don't know how to get more power...any suggestion? hmmm.....but it's irritating to know that you won't get over 140kw+++ atw if you are not using race fuel with race settings....why those Hi Rons does so much on the power?..haih...

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Originally Posted by SPEEDCORE

:confused:
Stock engine? More specifically cams?

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yea..Stock engine...By Toda...hehehehe...it's still stock rite...hehehe...

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Originally Posted by pgclee

mine goes 10k++++++...hehe...so i got another 3000rpm+++++ to play with...hehehe..but the problem is...i don't know how to get more power...any suggestion? hmmm.....but it's irritating to know that you won't get over 140kw+++ atw if you are not using race fuel with race settings....why those Hi Rons does so much on the power?..haih...

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LOL... That's not really true at all.
Your power target isn't impossible, just not cheap where you're at.

Honestly, you need to have your car built & tuned by someone who actually knows what they're doing... Not some tool pretending to know.
Unfortunatly, that's going to cost you.
The most expensive thing is going to be finding then un-building the f#%k-ups already build into your car.

High RON fuel often makes more power for retarded tuners because it lets get away with the stupid timing figures they were already using.

Thanks for the help guys..... discussions about 10k rpm and toda internals is really gonna help me out.

Be sure to tune in to a thread I will start specifically for you guys so you can pull your own cocks over and stroke your ego's some more.

Thanks to those that genuinely helped..... you know who you are.

Mods please close thread as I'll go else where to find technical help.

SPEEDCORE, i'm assuming you didn't get the answer you were looking for (I can't read your tone from your last post).

I'll leave this open incase someone has anything PRODUCTIVE to say. pgglee, thats great your car revs to 10K but its not helping us here so please make another thread if you want.

thanx adrian...
but it seems like there is no one i can trust in melbourne to do that kinda things that i've wanted...and i am so lazy to go to your place cause is so far..hehe..if you ever come down to Melbourne, i think lots of honda's will come to you...all i can say is that...all those ignition timing + cam phasing can do alot more power but there is no one who knows what they are doing when i told them to "try different setting"...

It's hard to find a good builder yet is even harder to find a good tuner...

OMG I Just Can't stop thinking about cheap tyres!

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Originally Posted by KB

OMG I Just Can't stop thinking about cheap tyres!

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What tha....??

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Originally Posted by pgclee

thanx adrian...
but it seems like there is no one i can trust in melbourne to do that kinda things that i've wanted......

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Keep looking were out there... ;-)

keep looking? Haha...then how much will they charge me? 1.5k - 2k?...for that price i can give my friend a ticket to fly over from Singapore or malaysia and do it for me...

no offence, but seriously i have no idea who is good here....if they are good, yea, Good in TALKING...when come to technical, they don't know anything...

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Originally Posted by pgclee

keep looking? Haha...then how much will they charge me? 1.5k - 2k?...for that price i can give my friend a ticket to fly over from Singapore or malaysia and do it for me...

no offence, but seriously i have no idea who is good here....if they are good, yea, Good in TALKING...when come to technical, they don't know anything...

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what kind of technical help ? thats where I specialize in, especially in Honda's and always stride to explain everything I do just ask anyone I deal with directly ;-)



2k to tune a car thats a bit rich .. but again depends what is being tuned, and how.



Regards James