If SOHC VTEC is made for eonomy, then why...
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Look at the Pro Drag cars, they dont run Vtec!! they just run the High cam.
VTEC allows the engine to effectively have two powerbands. A lesser on the low cam, then a higher on the high cam. The aggregate result is more power throughout. Mileage per gallon is just a nice side effect, and is ONLY there while cruising. When constantly on the gas, mileage is close to on-par with any other engine of like displacement and performance.
If you had said, "VTEC is for optomising performance and efficiency." I'd have no beef, but ya forgot the performance bit.
If VTEC wasn't for performance, how do you explain the near-vertical horsepower increases then a heightened curve thereafter on B-series engines when they hit the VTEC band?
bump to an old thread...
so by reading this.. i am assuming that since the dx/lx are already low compression that it would have an advantage over the ex's high compression when boosted?
so by reading this.. i am assuming that since the dx/lx are already low compression that it would have an advantage over the ex's high compression when boosted?
Last edited by xproductionz; Aug 22, 2004 at 11:44 PM.
Originally Posted by specter542
in sohc vtec, the vtec engages the intake cam lobes into a more aggressive mode....sohc vtec is practically worthless. DOHC VTEC=real vtec.
they were talkig about that in the beginning of the forum.. but what does everyone else think of what i posted in the previous post
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I have engine work and still can't feel vtec. I feel a pull in the higher rpms, but that's after vtec is already in high cam mode. Does gas mileage get affected if you're constantly driving above 65mph (so vtec hi cam will stay on)?
To answer your question, yes lx/dx is better for boost.
To answer your question, yes lx/dx is better for boost.
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Originally Posted by xproductionz
bump to an old thread...
so by reading this.. i am assuming that since the dx/lx are already low compression that it would have an advantage over the ex's high compression when boosted?
so by reading this.. i am assuming that since the dx/lx are already low compression that it would have an advantage over the ex's high compression when boosted?
which is why sohc vtec are not worth boosting............compression it too high. the LS on the other hand is perfect. i believe its got 9:1
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Rep Power: 0 ok i have an lx and my friend has an ex. he cant drive but i can. he beats me... why??? vtec advertised through honda inreases the hp by 12hp. i know because i still have my window display and so does he. hypothetically speaking, say the motors both pust the same hp. well if you have vtec, that extra 12hp wont diminish through the gear ratios. therefore 12hp is to the wheel. i can shift perfectly everytime but once that vtec kicks in, hes gone.
oh and a simpler way to reason why vtec is fuel efficient is that when you have a flame, the more air you have the bigger the flame, hence the less gas you need. so if you dont have proper air flow you would need more fuel to keep the flame alive.
oh and a simpler way to reason why vtec is fuel efficient is that when you have a flame, the more air you have the bigger the flame, hence the less gas you need. so if you dont have proper air flow you would need more fuel to keep the flame alive.
Originally Posted by gearbox
I have engine work and still can't feel vtec. I feel a pull in the higher rpms, but that's after vtec is already in high cam mode. Does gas mileage get affected if you're constantly driving above 65mph (so vtec hi cam will stay on)?
To answer your question, yes lx/dx is better for boost.
To answer your question, yes lx/dx is better for boost.
u have vafc.. change these vtec settings and let me know the results
v/t cont
L->H 4500
H->L 4000
the change ur v/t unmt
Hi<<L: +20 (my friend has his set at +18)
Lo<<H: +10
play with the Hi<<L setting till u feel it runs good cause thats whats causing ur engine to go weird on you.. the ecu is kicking in the vtec at i think around 3000rpm so it sends more fuel to the engine.. so when u change the vtec changeover point to 4500 the ecu still thinks the vtec is kicking in at 3000.. so the v/t unmt setting tells the ecu to not kick in any fuel till the setting u put it to.. so meaning it wont give any fuel till its 20% above normal.. wherever that is.. the book doesnt give any formula.. go figure
Originally Posted by hondasux
ok i have an lx and my friend has an ex. he cant drive but i can. he beats me... why???
the DX/LX pushes only i think 112hp.. or so they say.. and the ex pushes 127hp... once the vtec kicks in they it pulls more than the dx/lx.. plus the ex has higher compression ratio which makes it idealy a better n/a car (stcok from factory) than the dx/lx models
Originally Posted by bobbyd
All of you missed a huge reason...THE TRANSMISSIONS ARE DIFFERENT...The EX transmissions are geared different than the others. And believe me, this makes a HUGE difference.
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Rep Power: 0 Remember that even if all the ratios are the same, if the final drive is different, it does in fact make the effective gear ratios different. Effective gear ratios are what moves your car along...
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Originally Posted by xproductionz
the DX/LX pushes only i think 112hp.. or so they say.. and the ex pushes 127hp... once the vtec kicks in they it pulls more than the dx/lx.. plus the ex has higher compression ratio which makes it idealy a better n/a car (stcok from factory) than the dx/lx models
i agree with HONDASUX
i have an ex and my friend have a dx. from launch he got me about half a car because of a bad launch. it stayed that way all the way through the end of 2nd. than i started walking on him.
i have an ex and my friend have a dx. from launch he got me about half a car because of a bad launch. it stayed that way all the way through the end of 2nd. than i started walking on him.
Last edited by z00mX; Aug 23, 2004 at 08:58 PM.
Originally Posted by xproductionz
strange how mines kicks in hard and i can hear it
u have vafc.. change these vtec settings and let me know the results
v/t cont
L->H 4500
H->L 4000
the change ur v/t unmt
Hi<<L: +20 (my friend has his set at +18)
Lo<<H: +10
play with the Hi<<L setting till u feel it runs good cause thats whats causing ur engine to go weird on you.. the ecu is kicking in the vtec at i think around 3000rpm so it sends more fuel to the engine.. so when u change the vtec changeover point to 4500 the ecu still thinks the vtec is kicking in at 3000.. so the v/t unmt setting tells the ecu to not kick in any fuel till the setting u put it to.. so meaning it wont give any fuel till its 20% above normal.. wherever that is.. the book doesnt give any formula.. go figure
u have vafc.. change these vtec settings and let me know the results
v/t cont
L->H 4500
H->L 4000
the change ur v/t unmt
Hi<<L: +20 (my friend has his set at +18)
Lo<<H: +10
play with the Hi<<L setting till u feel it runs good cause thats whats causing ur engine to go weird on you.. the ecu is kicking in the vtec at i think around 3000rpm so it sends more fuel to the engine.. so when u change the vtec changeover point to 4500 the ecu still thinks the vtec is kicking in at 3000.. so the v/t unmt setting tells the ecu to not kick in any fuel till the setting u put it to.. so meaning it wont give any fuel till its 20% above normal.. wherever that is.. the book doesnt give any formula.. go figure
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From: NV
Rep Power: 812 Na, it's late here. And I don't wanna just start playing around without dyno results. Hopefully soon I can find a dyno and get everything tuned. Someone else here said the stock vtec point makes the most power. He ended up with close to 140whp with NA mods and tuning.
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From: NV
Rep Power: 812 Sweet. I was hoping to get at least $120 shipped for it, seeing as I paid $165 total. Let me know. It's in perfect shape with all the sensors.
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From: Gaithersburg, Maryland
Rep Power: 0 Damn, I really want to build up my motor. I think next year I'm going to be saving for 10.5:1 comp forged pistons, block gaurd, and maybe some new valve and valve springs if any are available. I really wish someone made a cam for us, not just a weak regrind. I want something aggresive, something that'll fvck up my idle and shyt.
New valves won't help unless you have turbo. 
get a vtec controller and u will notice... ur stock vtec kicks in at low rpms.. i think around 3000rom or so based on driving... but if u get a vtec controller then then uu can change ur engagement points to something more higher and optimal around 4500rpm... at least then u will notice it
