NON vtec & vtec

how R u guys

I see from searching on some fourms

some post wrote that non vtec turbo better than vtec turbo but on other fourms wrote vtec better
also I see that some wrote that non is better for daily drive


so my Q

what are the things that non vtec better than vtec?

&

what are the things that vtec better than non ?


Thanks

 

Vtec is better because it helps your engine breath...........

 

........:doh2:

 

ok look.......... you going to answer peoples threads or are you going to tell everyone they are wrong? tell him why vtec is good? or not good?

 

You have got to be kidding me...

Here ya go!
Let me google that for you

 

VTEC is better for performance. a stock b16 or GSR head will flow just as well as an LS head that has been worked by the best.

the only chance non VTEC has is the p8r head, which features the same diameter intake valves as the VTEC heads (33mm) and 84mm combustion chambers. the ports are larger than the standard p75 head IIRC.

 

wich lets the engine breath better? ^^^^^^^^^ same tang just not as detailed thanks matt........

 

just thought I'd explain in a little more detail so the op would understand why.

 

thanks for explaning

so vtec is better than non all th way

that hard for the non lol

 

vtec

 

VTEC is nice....I think most of us like its appeal (who doesn't like VTEC....Yo). It revs higher and flows well.

But those high revs on boost with a foot that feels like a guy about to get laid on prom night, ouch. And the same can happen with a non-VTEC set up.....

I feel it comes down to cost and application. Either one can be boosted and a hand full to drive on the streets but a LS swap can be sourced much cheaper and be a blast with 9lbs on a conservative turbo

 

not to mention lsv will get better MPG than a non vtec. most people dont care for that fact but when you drive a bunch like me.....well its something to think of!

also Vtec engines take a bit longer to tune, but most places charge by tune and not by the hour.

if it was up to me, I would use a Vtec head over a nonvtec.

 

i do like my straight LS setup. dont get me wrong.
but i can tell you that for my power goal (~400whp) im going to run into a few issues before i get there.
my next build however will be a little different, and yes itll probably still be non vtec

 

dont get me wrong, im building a nonvtec engine right now. really want to put that P&P head to use again.

but once I get enough cash to build my B16 head, Ill go LS vtec.

 

itll be the p8r route for me, which means 84mm bore on the sleeved bottom end

 

For most people, VTEC and turbo will give more power than non-VTEC and turbo. But VTEC is not ideal for boost. And for high boost, VTEC will cause you to not be able to build boost.

VTEC cams are for natural aspiration. For natural aspiration, you want to have overlap in the high revs. What is overlap? Normally you think of the valves working like this... the intake valves open, the exhaust valves are closed. Air comes in. Then you close the intake valves, light the mixture, open the exhaust valves and let it out. Repeat. Well overlap means that when the intake valves are first opening, the exhaust valves are still closing. The air rushing out of the exhaust creates suction that pulls more air in through the intake. More air is more power.

Now here's the problem with boost. The turbo is pushing the air, so you want the exhaust closed to trap the air in so it can build up pressure. If the exhaust is open, you're just blowing boost out of the exhaust and not building as much pressure. So, like I said, VTEC is not ideal for boost.

You can actually dial out some of the overlap using adjustable cam gears.

The best way to use your money is to put some turbo application cams in a non VTEC head, get an aftermarket intake manifold, a turbo, and a transmission from a VTEC engine.

 

i see your reasoning, but some/close to all the problems with a VTEC camshaft can be fixed with a set of GSR cams and a set of adjustable cam gears (like you said). VTEC heads ARE better for forced induction setups, simply because of the ability to flow more than MOST non-VTEC heads. the valves are larger (33mm intake, 28mm exhaust I believe) and the runners are also noticeably larger. stock intake manifold design is far better on VTEC heads than non-VTEC heads. overall just a better setup stock for stock.

not disagreeing, because you do have a point. but it can be fixed.

 

buy turbo cams yo! overlap problem fixed!

 

this is an option. but not necessary.. a lot of people are running OEM cams on high HP LS-VTEC setups.

 

you will make more power a lot easier with aftermarket cams VS oem gsr cams. higher lift, better duration, and low overlap.