1/4 Mile calculator

[ac3 b00gi3]

lol lol lol
Thanks

[TBITB]

Originally Posted by Mengsta

Cam shafts or cam gears? Have u guys done research on this? Theres a longass thread, saying cams dont help our cars because we run off timing and not lift like VTEC

timing and not lift like vtec? whats that?

[Mengsta]

Well heres the skinny on vtec. Vtec works bby having a different set of cam shafts. The camshafts have 2 sets of lobes, a lower lobe for lower rpm. Once yur car reaches a higher rpm the valves will run off the bigger lobes, meaning it will have the intake valve open longer and exhaust valve longer. Having cam gears will have a great affect on the camshafts. While VVTI runs off a pulley that adjusts the timing. I had AEM cam gears on my integ, which gave an AMAZING improvement, of course with cam shafts and a tune. That car was pretty sweet for a NA daily driver. Im not saying getting cam gears will have exactly NO affect, like most more experienced tuners, but i know for a fact its just not worth it.

[TBITB]

thanks for explaining. i think i get it. cams would have a negligable effect on our cars in your opinion? is this because VVTi controls more throughout the powerband and Vtec kicks in at a certain rpm?

[Vmix06]

so would be have to change the bands and the pulley to have those advantages that ur integra reacted with the cams mengsta?

[Mengsta]

Yes VVTi controls timing in our valves, hence the name. Variable valve timing. THough toyota does have VVTLi, which L stands for LIFT and is very similar to Vtec. I might've forgotten but VVTLi is used in the IS300's. And yes VVTi controlls timing throughout the whole powerband, some people claim to feel a jump after 4k rpm, that is because the powerband is just beefy in that area. Especially if you have boltons, which usually adds top end. VVTi though, is not enabled at like the first minute (depending on how cold) of a cold start.

Vmix- I guess you really cant get the advantages of aftermarket cam gears, Because if you did change cam shafts and cam gears to enable the valves to open longer; the VVTI pulley will just adjust the timing. We have a 64 bit ecu that just wants to control everything. If you want the advantages of a more responsive valve timing, I would assume you would have to adjust the 4 stroke process. Tcpete is a member on scionlife, that dynoed little under 200whp NA that is with the stock midpipe, and NO tune. He has little goodies and boltson but it was mostly with high compression pistons. Yes sadly Vtec is easier to make NA faster. But VVti allows our cars to seem more quick and comfortable driving around town.

-Just so I dont just seem like a smartass, I get all my information from countless websites, but mostly from books. My favorite is 4 stroke performance by A bell. I have never BUILT a full race motor like some people claim online lol.

[ac3 b00gi3]

i see my next upgrade
u rule mengsta .. gotta have u reveal all the secrets
about the enemy Honda lol lol lol

[Vmix06]

we need the info from the dark side(honda) lol
-thanks for the info Mengstai i knew that our VVTI engines were dif from others but now i have a better understanding on it

[Mengsta]

No problem guys, Just love learning more things, and explaining it in easier ways to understand, you guys have never owned/ test driven a honda? That is atleast recent enough to have vtec. My integ was no biggie but i have driven an s2k, which is a car i actually really like. But driving around town just felt less quick, since of course it has less torque. But when i did get on it, torque wasnt such a big deal since it revs past 7k, and with vtec. Basically hondas rely on high revving motors with vtec to save them from low torque motors. Sadly the dark side, lol, is actually coming up with more torquey motors now.

[TBITB]

i test drove the new Si in 06 before i got my tC. it is quicker than anything i've ever driven (so far). before i knew about vtec all i knew was i think i felt more pull past a certain rpm. before that i had a nissan sentra se-r. they have CVT (Continuously Variable Transmission) which i think is more like our VVTi.

[Mengsta]

Yea it does pull more past a certain rpm usually around 4k, like we were talkin about earlier lol. U thnk the civic is faster? Were u driving around town normally, or were u actually going near WOT or revving high? The civic felt slow to me when i first test drove it, and it had 3k mileage that was properly broken in, That was until i went WOT for fun. Also I dont know much about CVT yet, but VVTi has nothing to do with transmission.

[ac3 b00gi3]

definetly gotta up my boost now
the enemy is catching up lol

[bwood87]

VVT-i and CVT have nothing to do with each other. VVT-i deals with valve timing and CVT is a type of transmission. There is manual, automatic and CVT. There are several variable valve timing systems, Honda has Vtec, Mitsu has MIVEC, Toyota has VVT-i, etc. CVTs are rather interesting, I would recommend reading up on them.

[TBITB]

Originally Posted by bwood87

VVT-i and CVT have nothing to do with each other. VVT-i deals with valve timing and CVT is a type of transmission. There is manual, automatic and CVT. There are several variable valve timing systems, Honda has Vtec, Mitsu has MIVEC, Toyota has VVT-i, etc. CVTs are rather interesting, I would recommend reading up on them.

i meant Continuously Variable Valve Timing Control System (CVTCS). sorry for missing that one

[ac3 b00gi3]

lol lol lol
we all make mistakes
well i guess thats better
a continuous control system is always good