i was reading another thread about FI and N/A 1/4 mile times and i was wondering w/ my mildly build gsr w/ lsd would it be better to launch in vtec (around 5-6k) or lower! i know i would have to go do it my self and find out but im not at a track to see my times! so does anyone have any help? It seems like if i launched between 5-6k w/ feathering the clutch i would still spin a lot!

 

bump

 

unless you are running a stanalone or modify the stock code, vtec does not engage <20mph.

 

i think the vafc does aswell.. if you rev the car high enough with the clutch in not moving you can hear the solenoid click. its pretty loud too!

 

Is that how that works? You need to be moving to engage VTEC? Wow. Did not know that.

 

no, vtec kicks in even when your car is in neutral. when you floor your gas pedal towards the end of your rev, you will hear your engine get high pitched (slightly). Plus with the help of apex v-afc you can see that it does activate when you are not moving.

Just because of the load you can't hear it when you are not moving.

 

Well it wont engage without a speedometer so I would guess that it does use the speedo input for the < 20 mph rule.

However back to the original question (because I have asked this before):
If you do have a standalone that allows you to disable '< 20 MPH VTEC' is it better to launch on the VTEC lobe or to launch really high on the smaller lobe. Last season I was launching at 5300RPMs and I had it set to engage VTEC no matter what. My 2-step was MUCH louder on the VTEC lobe but I did notice that right when the clutch grabbed I would drop below 4800rpms and I would fall out of vtec and then have to re-engage it.

 

i wouldnt be concerned with vtec at all i would be concerned where you get traction at. vtec isnt going to matter that much if you get traction before vtec you will just pull harder when you hit it. if you have traction even after vtec then upgrade your tires or try to get more low end torque. if you are running slicks it wont matter as you would probably launch at 6000 rpm plus

 

i had a vtec light im my car for a year and never noticed this phenomenom. Always at an indicated 18 mph or higher on a launch. It will engage after tire slip nets the 20 mph necessary to activate but after you hook up you might drop out for a split second.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evilhatch2.0 &raquo;</TD></TR><TR><TD CLASS="quote">no, vtec kicks in even when your car is in neutral. when you floor your gas pedal towards the end of your rev, you will hear your engine get high pitched (slightly). Plus with the help of apex v-afc you can see that it does activate when you are not moving.

Just because of the load you can't hear it when you are not moving.</TD></TR></TABLE>

 

Have found launching with the VTEC to be much more beneficial..it's what your setup/tires can handle though..when I launch, I make sure to take the Honda, any car for that matter, to around 2-300 rpms more than the VTEC engagement point, then keep the accelerator pedal constan, and dump the clutch and let her gain traction before flooring it, have found that to work pretty well on nearly all Hondas I've driven.

Test it out, and let me know how it goes.

Good luck

 

it is wise to launch in vtec.....

 

you cant launch it in vtec if you have traction . Its hard to do at all. Im my car it would just spin forever. You hook up rpms drop and vtec doesnt engage untill around 20 mph anyway. Maybe you should read all the posts.

 

drag car with fi. well i got fast ems trigger it for whenever. sorry, but it would be better. it dont take long to hit 20 if thats the case.

 

Dude, someone mentioned using a VAFC for the same, hence my input.

 

I've noticed cars with VAFC's will go into vtec while not moving.

 

if you launch in vtec using vafc or whatever you still would have to let off or slip the clutch as you would have too much spin so what would be the point. Vtec dont mean **** its where you get traction that matters if you cant get traction in vtec than why try to launch in it just to go back out of it. If you can than that is fine . But asking which one is better can only be found on the strip because you really havent posted enough about your setup to be all inclusive.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecmissle &raquo;</TD></TR><TR><TD CLASS="quote">if you launch in vtec using vafc or whatever you still would have to let off or slip the clutch as you would have too much spin so what would be the point. Vtec dont mean **** its where you get traction that matters if you cant get traction in vtec than why try to launch in it just to go back out of it. If you can than that is fine . But asking which one is better can only be found on the strip because you really havent posted enough about your setup to be all inclusive.</TD></TR></TABLE>
Im running a gsr setup ctr pistons, skunk 2 intake manny and hondata, tires nittos 195/50/15 and LSD!!!! hope this helps

 

i would recommend about 3500 rpm load up the drivetrain a little and release the clutch somewhat abruptly. Let the clutch slip a little or modulate the gas pedal untill you get traction and let her rip. I run 9.40s in the 1/8 with kumhos or nitto 555s on. On street tires i run 18 psi and a little less on the drag radials. I am using bfg now but i cant run it as my car is broke. I ran my times with bent valves and bad rings but still pulled 2.1 2.2 60s. I would say leave vtec out of the equation it means nothing what maters is the power output and traction bring the two together the best you can. If you got the traction youll have to launch in vtec if you dont then you are wasting your time and your et. I have 4.78 gearset jdm and run 205 nittos and kumhos and have recently fit 225 50 15 bfg dragradials to my car with utter sucess. I love them. Good luck.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecmissle &raquo;</TD></TR><TR><TD CLASS="quote">i would recommend about 3500 rpm load up the drivetrain a little and release the clutch somewhat abruptly. Let the clutch slip a little or modulate the gas pedal untill you get traction and let her rip. I run 9.40s in the 1/8 with kumhos or nitto 555s on. On street tires i run 18 psi and a little less on the drag radials. I am using bfg now but i cant run it as my car is broke. I ran my times with bent valves and bad rings but still pulled 2.1 2.2 60s. I would say leave vtec out of the equation it means nothing what maters is the power output and traction bring the two together the best you can. If you got the traction youll have to launch in vtec if you dont then you are wasting your time and your et. I have 4.78 gearset jdm and run 205 nittos and kumhos and have recently fit 225 50 15 bfg dragradials to my car with utter sucess. I love them. Good luck.</TD></TR></TABLE>
ok kool thanks man

 

i think 3500 is way too low.

 

This thread is retarded. Buy some slicks and launch off the rev limiter like a real man. **** even if you have drag radials, launch as high as you can without spinning the tires too much. Who cares about vtec...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beerbongskickass &raquo;</TD></TR><TR><TD CLASS="quote">This thread is retarded. Buy some slicks and launch off the rev limiter like a real man. **** even if you have drag radials, launch as high as you can without spinning the tires too much. Who cares about vtec...</TD></TR></TABLE>

 

my speed limiter, and speedo are both disabled so I see vtec when in neutral. VAFC bypasses the ecu any way. How do you think that people run pm6(NON VTEC) ecu's and use the VAFC to engage vtec. all vtec is is a 12v signal and when you have a vafc it applies a 12v signal at the selected rpm piont whether vtec is intercepted or not.

Sooooo, WITH A VAFC YES YOU CAN ENGAGE VTEC IN NEUTRAL.

 

Who gives a **** if vtec engages in neutral, while driving, or while taking a ****...

I sure don't care.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evilhatch2.0 &raquo;</TD></TR><TR><TD CLASS="quote">no, vtec kicks in even when your car is in neutral. when you floor your gas pedal towards the end of your rev, you will hear your engine get high pitched (slightly). Plus with the help of apex v-afc you can see that it does activate when you are not moving.

Just because of the load you can't hear it when you are not moving.</TD></TR></TABLE>

Not on a stock ECU. No signal from VSS = No Vtec. PERIOD.