When does vtec engage on a 94 b18c? Would would be the advantages/ disadvantages to lower the engagement?

 

4400, none on a stock motor.

 

4400, keep it stock.

 

As they said.

What mods do you have? Youll never want to lower vtec. Ever. Bump it up? Yes. Depending upon your cam/IM setup.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WiggiE &raquo;</TD></TR><TR><TD CLASS="quote">4400, none on a stock motor.</TD></TR></TABLE>

 

no mods except header and skunk2 intake manifold
thanks guys

 

i say run VTEC off a taco switch..AND LEAVE IT ON AT ALL TIMES...vtec on while your car idles sounds super super JDM hahahaah

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JayDM.com &raquo;</TD></TR><TR><TD CLASS="quote">i say run VTEC off a taco switch..AND LEAVE IT ON AT ALL TIMES...vtec on while your car idles sounds super super JDM hahahaah
</TD></TR></TABLE>

umm...

 

Engaging VTEC in a lower RPM without fuel compensation creates massive amount of heat within the engine b/c it's running lean.

Increase air flow due to the opening of the valves and not enough fuel to compensate will ruin your motor. Most likely you'll warp a lobe on the cam or damage something in the head.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JayDM.com &raquo;</TD></TR><TR><TD CLASS="quote">i say run VTEC off a taco switch..AND LEAVE IT ON AT ALL TIMES...vtec on while your car idles sounds super super JDM hahahaah
</TD></TR></TABLE>


i dont get it........

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by legutki &raquo;</TD></TR><TR><TD CLASS="quote">no mods except header and skunk2 intake manifold
thanks guys</TD></TR></TABLE>

if you have a skunk2 IM, you are going to want to raise your vtec and get that **** tuned. i need tuning bad. Stock IM is a dual runner, and Skunk2 is a single runner. it messes your whole fuel map up. get a vafc and take it to a dyno to get tuned. 5700 is a good starting point till you get to a dyno.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jvithayapun &raquo;</TD></TR><TR><TD CLASS="quote">


i dont get it........ </TD></TR></TABLE>

hmm perhaps he meant toggle switch?!...either way=

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xrocket21 &raquo;</TD></TR><TR><TD CLASS="quote">

if you have a skunk2 IM, you are going to want to raise your vtec and get that **** tuned. i need tuning bad. Stock IM is a dual runner, and Skunk2 is a single runner. it messes your whole fuel map up. get a vafc and take it to a dyno to get tuned. 5700 is a good starting point till you get to a dyno.</TD></TR></TABLE>


umm...i dunno about that dood

 

the vtec does not kick in at 4400( this is the secondary runners opening) it kicks in at 5700 and if you get a skunk2 intake manifold it will not mess up your fuel maps it will just make your car lose torque and Hp at the lower rpms and midrange rpms. if you want to improve your hp gains lower the vtec point to about 5200 anything lower will cause you to lose more power

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cleggboy &raquo;</TD></TR><TR><TD CLASS="quote">the vtec does not kick in at 4400( this is the secondary runners opening) it kicks in at 5700 and if you get a skunk2 intake manifold it will not mess up your fuel maps it will just make your car lose torque and Hp at the lower rpms and midrange rpms. if you want to improve your hp gains lower the vtec point to about 5200 anything lower will cause you to lose more power</TD></TR></TABLE>
Sorry bud, but you have this COMPLETELY backwards.

 

so stock the vtec kicks in at 5700 rpms

 

VTEC kicks in at 4400, and 2nd im runners open at 5700 or something. If you get a skunk2 im, you need to move vtec up to compensate for the single runner intake. Butt when you do this, from 4400 until your new vtec point, you will run super rich, cause you are in vtec fuel map territory without the vtec. Just go get it tuned. It is HIGHLY necessary after a skunk2 im. You are prolly putting out LESS HP than stock until you do.

 

and it doesnt mess up your fuel map, it just makes your fuel map wrong for your setup.

Stock fuel map see vtec at 44, then 2nd im runners at 57

Skunk2 youre just gonna have vtec at 57 or whatever

so from 44 till 57 youre gonna be adding extra fuel for the vtec lobes, when you are still at lo cam setting.

I have this problem right now. im lean at idle, then rich from 44-57, then who knows what up top. too bad the closest dyno is 3 hours away

 

ok, i understand raising the vtec when getting the manifold, but to 5700?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MaliceGSR &raquo;</TD></TR><TR><TD CLASS="quote">ok, i understand raising the vtec when getting the manifold, but to 5700? </TD></TR></TABLE>

Thats around where it kicks in on the b18c5 and b16a. Im pretty sure thats why it is picked as a starting point for tuning. I miss having vtec at 44, its a lot more usable then at 57.

 

4400. Actually mine is set @ 4600. I consider it stock (i/h/e).

 

so you need to have a skunk2 manifold tuned or your going to lose power? Is that what this is all saying.

Is it better to run a stock manifold then?

When would the skunk2 manifold benefit the car. Only if it is tuned?

thanks and sorry for the questions but i just want to know all this.

 

Right, the only way you will get gains from a skunk2 im is with tuning, cause it is such a difference from stock, it isnt that it just is bigger or something like an intake or exhaust, its a single runner instead of a ddual runner. its kinda a whole different design. Too many epople get lured into thinking the skunk2 im is a bolt on. its deffinitely not . You need tuning to get any HP, and a skunk2 IM only REALLY shines when u add cams, then it really takes off!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by patdemps &raquo;</TD></TR><TR><TD CLASS="quote">so you need to have a skunk2 manifold tuned or your going to lose power? Is that what this is all saying.

Is it better to run a stock manifold then?

When would the skunk2 manifold benefit the car. Only if it is tuned?

thanks and sorry for the questions but i just want to know all this.</TD></TR></TABLE>
If you have some work done to the engine, then get the IM. It just doesnt help to have it on a stock car. And yes, youre gonna want to tune it

 

I cant really understand all the confusion on this topic. Its fairly straight forward...

Stock Gsr has two stages of vtec. The vtec lobe comes in at 4400. And is using the long intake runners. At 5700 it switchs its intake runners to the short ones. Vtec sounds more like it came on at 5700 because of the runner switch. But it actually came on earlier at 4400. The vtec cam kicks on at 4400, and stays to redline.

The skunk 2 only has one set of runners, so the vtec point should be raised, as 4400 is now too low, or honda would never have made the 2 runner design.

And yes tune it. The Manifold is good, but its not a simple bolt on!