hatchboy93

my jun p28 ecu has a 5700 rpm kick in for vtec. my friend has the mugen p30 ecu and his kickes in at 4800 rpms. what do u guys prefer or think is better???/

eg6ajk

depends on the setup. if you have the dynos of the programs side by side then you can clearly make judgment.

hybridreams

stock.

4g4me

sometimes my vtec kicks my ***, be careful....

terminology is catalyst for intelligence

Apex i ITR

Wherever is optimal....What's that? How do yuo find out where is the optimal point you ask?? When you are on the dyno and tuning your car.

IS3Fifty

you cant set it to low or you will begin to burn valves...im assuming that you understand how vtec works... So i dont need to go into that. Is your motor stock? what setup do you have??

hatchboy93

im running a 96 jdm ITR motor b18c with s80 lsd tranny with 4.40 final and my ecu hasnt come in yet but it is and ist sht jun ecu with a 5700 vtec engagement point. i guess my question shold really be what is the optimal vtec kick in point for the 96 ITR motor? is tha better

NonovUrbizniz

stock... that's why they put it there...

If you want to know how to determine it for YOUR Engine and not just get a broad generalization....

You have to dyno the car in and out of vtec... the spot where the 2 power curves are CLOSEST is where you want it to kick in.

this way you get the most power out of non-vtec lobes and have the shorter drop in power during the change over. Too early and the vtec lobes aren't making more power... Too high and the non-vtec lobes are struggling to make ANY power much less more than they were a few hundred rpm ago.

If you look at the power curve of the non-vtec lobes they drop off FAST after they reach they're peak... so too high a vtec kick in will give you a slow spot in the middle of your gear as the motor strains to make it upto the vtec engagement point.

good luck.

D16Z6racing

I prefer the stock setting too. Once agin that is why it's there.

The only way I'd adjust it, is 200 rpms lower, for shifting purposes. A lot of times after shifting you will just drop out of VTEC engagement. This lil' difference can help keep you in VTEC after a shift.

Kamin

stock

honda didnt just pick a number and say "there! thats where were putting vtec!"

GTlvr82

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

honda didnt just pick a number and say "there! thats where were putting vtec!"</TD></TR></TABLE> As always Kamin comes up with something smart to say ...he's right though. Honda put alot of thought into those motors and vtec was one of those long "thoughts".

blackANESE

iTrader: (2)

VTEC @7200 is sweet. Helluva kick in

ABTDer

figure where your stock vtec kicks in and from that point you be the judge.. do you want it before that or after that.

sshaikh01

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4g4me &raquo;</TD></TR><TR><TD CLASS="quote">sometimes my vtec kicks my ***, be careful....

</TD></TR></TABLE>


lmao

sshaikh01

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blackANESE &raquo;</TD></TR><TR><TD CLASS="quote">VTEC @7200 is sweet. Helluva kick in </TD></TR></TABLE>

isn't that the secondary valve

Kamin

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sshaikh01 &raquo;</TD></TR><TR><TD CLASS="quote">

isn't that the secondary valve</TD></TR></TABLE>
no. thats 5700.

sshaikh01

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kamin &raquo;</TD></TR><TR><TD CLASS="quote">
no. thats 5700.</TD></TR></TABLE>

than the heck is that noise at 7500, sounds like another valve opening

FcUK It.

you should get a vafc and dyno it to set the rpm the vtec kicks in for the best results

sshaikh01

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by frosteg6 &raquo;</TD></TR><TR><TD CLASS="quote">you should get a vafc and dyno it to set the rpm the vtec kicks in for the best results</TD></TR></TABLE>

I defenalty hear and feel it at 5,500. When i'm gunning it i also hear another valve open up at 7,500.

Apex i ITR

Do you have a GSR motor. A friend of mine with a JDM GSR motor said he swore he heard a louder noise in the higher RPM.

IS3Fifty

if anything kick vtec back that way you wont burn your valves.

lazy bum shaughn

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Apex i ITR &raquo;</TD></TR><TR><TD CLASS="quote">Do you have a GSR motor. A friend of mine with a JDM GSR motor said he swore he heard a louder noise in the higher RPM.</TD></TR></TABLE>

Because GSR motors have dual stage VTEC or something.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by purek9hybrid &raquo;</TD></TR><TR><TD CLASS="quote">
if anything kick vtec back that way you wont burn your valves.
</TD></TR></TABLE>

Explain.

Damon

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

Because GSR motors have dual stage VTEC or something.

</TD></TR></TABLE>are you serious? you really arent saying that are you?

i-vtec is multi stage, but vtec is single stage (on/off). the tone in a GSR changes because of the plenum in the intake manifold. it changes the airflow at certain points to increase torque. as the airflow changes, the tone changes.

Nine

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">i-vtec is multi stage, but vtec is single stage (on/off). the tone in a GSR changes because of the plenum in the intake manifold. it changes the airflow at certain points to increase torque. as the airflow changes, the tone changes.</TD></TR></TABLE>

W3rd. Why is the vtec engagement point higher on a b16a sir2 then it is on a b16a2? I understand that honda set it up this way to offer the best power curve but since the only difference that Im aware of between the two engines are the pistons, is the higher comp what makes the vtec engagement point later or is it just the power output itself?

Im not sure if that makes sense, but if someone can help, Id appreciate it.

93solsigsr

yea a gsr has 2nd butterflys in the maifold, thats one reason they have good bottom end, my vtec kicks in @ 4,800 i think that is a stock 94-95 GSR ecu, i think somewhere around there is best unless you have different cams