hondaeg8

i have gsr motor and it seems like sometimes i don't hear vtec. i gradually let the rpms rise to day in second gear and when vtec was supposed to kick in, i didn't hear it. it was just like a smooth transition into vtec with no sound.

any ideas?

handa

did you let the car run until it's at normal operating temperature?

94_HATCH

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondaeg8 &raquo;</TD></TR><TR><TD CLASS="quote">i have gsr motor and it seems like sometimes i don't hear vtec. i gradually let the rpms rise to day in second gear and when vtec was supposed to kick in, i didn't hear it. it was just like a smooth transition into vtec with no sound.

any ideas? </TD></TR></TABLE>


Why are you worried about the sound? As long as its working i wouldn't be worried

JDMlyfestyle

was your car up to temperature? if it wasnt then maybe thats why you didnt hit vtec. your engine must see at least 55 psi of Oil pressure for vtec to engage.

Deemeetree

Indeed, too many people are worried that they don't HEAR VTEC. Why do you want to hear it? It doesn't make you m4d tYt3 JDM y0 to do so. Who cares, if it works, it's all that matters.

AutoXer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondaeg8 &raquo;</TD></TR><TR><TD CLASS="quote">i have gsr motor and it seems like sometimes i don't hear vtec. i gradually let the rpms rise to day in second gear and when vtec was supposed to kick in, i didn't hear it. it was just like a smooth transition into vtec with no sound.

any ideas? </TD></TR></TABLE>

This has happened to me and a few friends occassionaly. It has to do with the load on the engine at the time of VTEC engagement, and how fast the engine speed is increasing. It's just like your engine sounds different at different times depending on load.

Of course, this is assuming that you had running temp and good oil pressure.

crx_88_si

with a oem ecu controlling vtec you need to meet certain requirements.

+75% throttle
car has to be warmed up
has to be above x speed (5 mph?)
oil pressure @ or above x psi.

so if you "gradually" raise RPM you probably aren't WOT

electronb16si

Is there enough oil in your car? If there is not the vtec solenoid will not be able to engage. Check the dipstick and make sure its full.

Jlo96Hatch

Dude he said it engages he just cant hear it. Checking oil pressure will do nothing if its working.

AutoXer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crx_88_si &raquo;</TD></TR><TR><TD CLASS="quote">

so if you "gradually" raise RPM you probably aren't WOT </TD></TR></TABLE>

What I meant was that going uphill at WOT, the engine RPMs rise much slower than going downhill. The engine speed increases based upon load even at WOT. Sorry if I didn't make that clear. I'm a ******

showtymers619

its actaully depends on the load your giving it.. i have some ctr cams in my gsr.. stock gsr ecu... with 7.5 lbs f/w .. ive notice that my vtec actaully raised itself if im let say 1/2 to 2/3 throttle but at full throttle it always engages at stock setting.. but if i grdually raise my rpm lets say freeway i can hardly hear my vtec turn on.. its normal not to hear it on partial throttle..but then again my del sol still has stock intake and exhaust AHAHAHA but full throttle i get mad vtec yo!

Tokyo_X-treme_Racer

It's not like a turbo when you want to hear it spool and hear the blow-off vlave go off, don't expect that much from VTEC system, as long as it works.

AutoXer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ShowTymers619 &raquo;</TD></TR><TR><TD CLASS="quote"> its normal not to hear it on partial throttle..but then again my del sol still has stock intake and exhaust AHAHAHA but full throttle i get mad vtec yo! </TD></TR></TABLE>

That's because it doesn't work at partial throttle

HATCHingMN

Go get a j's racing intake and you'll hear mad VTEC at any rpm range!!
now thats a gurantee vtec everytime

hondaeg8

my car was up to temp
i have enough oil and it was reading good psi, i have an oil pressure guage
i was only at partial throttle though, i wasn't at WOT

i just like to hear it when it kicks in and i was just wondering why i didn't hear it.

i heard it today on the way to work

EGinNY

If you gradually accelerate it will NOT pop like it would if you were at WOT....This
is normal....just when you want to hear it accelerate gradually and hit the gas harder right before vtec engages

Jimmy

iTrader: (5)

Is the car stock...?

hondaeg8

nope....

I/h/e

msd

skunk2 mani

adri_eg33

maybe you just like the sound but as long as it works thats all that counts bro

Good ol' Screwtape

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adri_eg33 &raquo;</TD></TR><TR><TD CLASS="quote">maybe you just like the sound but as long as it works thats all that counts bro </TD></TR></TABLE>

Don't take this personally,
But all you people who are giving answers like this are just saying that because you have absolutely no explanation for his question.

Though anyone should agree, yes, the sound isn't worth a damn as long as it works. But that's not what he asked, is it? If you can't answer his question, quit being an *** and be on your way.

Deemeetree

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

Don't take this personally,
But all you people who are giving answers like this are just saying that because you have absolutely no explanation for his question.

Though anyone should agree, yes, the sound isn't worth a damn as long as it works. But that's not what he asked, is it? If you can't answer his question, quit being an *** and be on your way. </TD></TR></TABLE>

So why did you post on here then? Since you're not going to answer his question.

Slow_Em1

low on oil?

Good ol' Screwtape

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dimi &raquo;</TD></TR><TR><TD CLASS="quote">
So why did you post on here then? Since you're not going to answer his question.</TD></TR></TABLE>

Yeah, ok. Clever follow up.

1.) People have already given suggestions as answer to his questions and I think they're sufficient.

2.) To answer your question, it's because I'm a ******** too, admittedly.
Can't deny it.

Oh...and just as a general question: If "sound doesn't matter as long as it works" why is everyone always worried about what their exhausts "sound" like?

RabbittZ

iTrader: (1)

hey... hondaeg8 you have a pm... lol.. sorry to jump on this topic. its a question for you.

MNEJ1GUY

this might help...

VTEC Honda ECUS have two complete and independant fuel and ignition maps for each camshaft. We are not aware of any standalone that has this capability.

Having 2 maps makes the tuning process very straight forward.

Set the VTEC point to 7000 RPM and tune the low speed cam fuelling and ignition
Set the VTEC point to 3000 RPM and tune the high speed cam camshaft.
Plot the torque curves and set the VTEC point to the crossover RPM

This method ensures a very smooth VTEC transition (some JR customers have complained their VTEC was not working when it in fact was)

Be aware that stock Honda ECUs have 10 VTEC points, not one, and at light throttle the VTEC point can be 1000-1500 RPM higher than at full throttle. If you are running with a standalone with one ignition and fuel map and have a variable VTEC point (or a piggyback with a fixed VTEC point), then you cannot have the correct fuelling and timing for both cams all the time.