just looking for an answer if there is one. how much hp does vtec actually add to a motor? say your vtec wasnt working for some reason how much hp would be lost or gained if it was working.

later hector

 

vtec doesn't ADD any more hp than the same cams would make at the same rpm
having the same lobes on ...

Vtec was created to be able to tune and engine for low-mid-high power
and for fuel economy

doesn't do anything more than this ...

and the reason it exists, is because everything is always a compromise!

 

i dont think you understood my question. say you a had a b16 and your vtec wasnt working you would not make the 160hp you would make less. that is what im asking. if you vtec wasnt working how much HP would you loose? i know the theory of vtec and why/how it works. i was just thinking about this and im curious if anyone else ever was.

thanks hector

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HECDWS &raquo;</TD></TR><TR><TD CLASS="quote">i dont think you understood my question. say you a had a b16 and your vtec wasnt working you would not make the 160hp you would make less. that is what im asking. if you vtec wasnt working how much HP would you loose? i know the theory of vtec and why/how it works. i was just thinking about this and im curious if anyone else ever was.

thanks hector </TD></TR></TABLE>

It would lose a lot...

Time for this thread to end now.

 

For example, I have a b16b in my car that is mildly built. On a stock ctr motor when vtec engages it's a 21-25 horsepower increase right away. It's not only the horsepower increase though, the torque goes up mildly and the car reaches redline extremely quick. I personally love LS' for turbo application's. If I was to build a budget turbo motor it would definetley be a non-tec. Two completely different motors.......

 

This question is motor-specific.

The best way to answer it is to look at a dyno, and notice the torque curve of the motor just before the switchover. If you were to continue drawing that line (as if VTEC didn't exist), you would see a very quick fallout of torque, which translates to an even faster loss of HP.

On a B18c1... I'd guess a loss of about 20-25 whp... but that's just throwing a random number out there.

However, if you were to disable VTEC and somehow use the more aggressive cam only... you wouldn't get a loss of peak HP at all, just low end torque and driveability. This is the problem ricers get into when they get a VTEC controller and set it at 3000 rpms.

 

ok loking at the dyno graphs on import builders site i noticed that most 1.8L vtec's make about 100-110hp before vtec. after vtec is turned on it all depends on what cams are used but all the increaes seem to be way over 25hp when pulling to redline. so once the primary lobes make that 100-110hp at say 5k rpm will they not make any more power if dragged out to redline (just asking).

hector

 

just a bump. still looking for the answer.

hector

 

it will lose power.. god..