My VTEC engages at 5800rpms i have a jdm b16a, some people tell me that it is too high and people tell me that theirs kicks in at like 4000 something. when does your vtec kick in and what kind of motor do you have and what mods. would you suggest that i should take it somewhere and see when the crossover is and get it adjusted accordingly? is that what you guys did?

 

My vtec engages at 5300 rpm on d16y8.
Mods: 8.5 lb ACT pro-lite flywheel
Exedy clutch
unorthodox crank pulley
hi flo cat , 2.25" piping
k&n filter, spoon direct air pipe and cooling system

Friends car: jdm b16a2, too many mods, mostly bolt ons, stock internals
except for spoon valvetrain
vtec engages at 6200 rpm with a 8900 rpm redline
he's running the obd2b type r ecu

5800 rpm is normal for that engine....i think. The 99 si is something like 5500 or 5700. I know the jdm is a little higher than that. If you want your vtec lowered get a vtec controller. We both have vtec controllers. I have the power enterprise vtec and a/f controller (which is good for a semi-built engine) and he has the apexi vafc2. The apexi has a lot more options to it than mine, but mine still allows for a good amount of fuel adjustment and vtec engagement. The apexi is a screen display as opposed to mine which is an analog gauge type. Apexi is ideal if you have a crazy built engine....both need to be tuned on a dyno.

 

4400 is where my vtec engages. I have a mini me set up. a6 block (91 SI) and z6 head (93 civic SI). But that is because I have the RPM switch and a 4400 pill

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16Civic93 &raquo;</TD></TR><TR><TD CLASS="quote">My VTEC engages at 5800rpms i have a jdm b16a, some people tell me that it is too high and people tell me that theirs kicks in at like 4000 something. when does your vtec kick in and what kind of motor do you have and what mods. would you suggest that i should take it somewhere and see when the crossover is and get it adjusted accordingly? is that what you guys did? </TD></TR></TABLE>
dont listen to other people.

your vtec engages right where it should be, those idiots who turn it on in the 4000 range (unless they have a GSR or a d16z6) are only making their cars slower.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kamin &raquo;</TD></TR><TR><TD CLASS="quote">dont listen to other people.

your vtec engages right where it should be, those idiots who turn it on in the 4000 range (unless they have a GSR or a d16z6) are only making their cars slower.</TD></TR></TABLE>

I tired it up in the high range too. It seems like 4400 is best for the z6 head and a6 block!!

 

Get on a dyno and you can lower it as low as you want, that's if your motor can flow well enough to use the VTEC lobes at such low RPMs. There are 2 ITR's on this board who have their VTEC set in the 3k's RPM on STOCK ITR cams. One is using an SMSP full exhaust with some headwork, and the other is using a Hytech full exhaust stock head.

For the most part though, you should be fine leaving the VTEC at the stock point.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96dc2 &raquo;</TD></TR><TR><TD CLASS="quote">Get on a dyno and you can lower it as low as you want, that's if your motor can flow well enough to use the VTEC lobes at such low RPMs. There are 2 ITR's on this board who have their VTEC set in the 3k's RPM on STOCK ITR cams. One is using an SMSP full exhaust with some headwork, and the other is using a Hytech full exhaust stock head.

For the most part though, you should be fine leaving the VTEC at the stock point.</TD></TR></TABLE>

AGREED

 

I wouldn't worry too much about your vtec point, unless you drop out of vtec when shifting through the gears. That's my problem right now. I have a PCT ECU with a 6200 vtec X-over and when I shift into 2nd my rpms drop down around 5800rpms. I plan on trying 5200-5500 rpms with my VAFC. good luck

BTW what ECU are you running??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spoonek9 &raquo;</TD></TR><TR><TD CLASS="quote">I wouldn't worry too much about your vtec point, unless you drop out of vtec when shifting through the gears. That's my problem right now. I have a PCT ECU with a 6200 vtec X-over and when I shift into 2nd my rpms drop down around 5800rpms. I plan on trying 5200-5500 rpms with my VAFC. good luck</TD></TR></TABLE>

See thats the problem with vtec engaging that high, that when you shift, your RPM will drop out of vtec. Thats why I have mine set at 4400 with a pill

 

Friends car: jdm b16a2, too many mods, mostly bolt ons, stock internals
except for spoon valvetrain
vtec engages at 6200 rpm with a 8900 rpm redline
he's running the obd2b type r ecu

how does he know that it redlines at 8900, that motor should redline at 8200 and it has stock internals. what bolt ons does he have? and what does it run?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16Civic93 &raquo;</TD></TR><TR><TD CLASS="quote">Friends car: jdm b16a2, too many mods, mostly bolt ons, stock internals
except for spoon valvetrain
vtec engages at 6200 rpm with a 8900 rpm redline
he's running the obd2b type r ecu

how does he know that it redlines at 8900, that motor should redline at 8200 and it has stock internals. what bolt ons does he have? and what does it run?</TD></TR></TABLE>

The "Quote" button is a pretty usefull button

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16Civic93 &raquo;</TD></TR><TR><TD CLASS="quote">how does he know that it redlines at 8900, that motor should redline at 8200 and it has stock internals. what bolt ons does he have? and what does it run?</TD></TR></TABLE>

Spoon 70mm throttle body
Spoon ventuli plate
Spoon valve springs
Spoon head bolts
ITR intake
AEM fuel rail and FPR w/marshall fuel gauge
CTR pistons
CTR ECU
No cat

Rev limiter is set at 8900rpms on the CTR ECU. I don't have any numbers on my car yet due to a blown headgasket. It blew shortly after I got it in the car.

 

sorry i'm new i dont know how to use the quote button, i dont even know where it is.
and for spoonek9: what is a ventuli plate? and does a CTR ecu plug directly into a wiring harness for a b16? how much did all that stuff run you?

 

Ventuli (venturi, this how it should be spelled but....) plate is a intake manifold gasket that increases air flow into the combustion chamber. For more info check out this link: http://www.spoon.jp/eng/products/lineup.html

There are 2 types of CTR ECUs. One will plug into a 96-98 OBD2a wire harness, while the other will plug into a 99-00 OBD2b wire harness. It all depends on what car and harness you are using if the CTR ECU will plug right in, but they make wire harness jumpers for all sorts of OBD configurations. Like: OBD2a to OBD1 or OBD1 to OBD0. It all depends on what you need. Let us know what car you have and we should be able to help you out. I have a 96-98 CTR ECU for sale.

As far as how much I spent on all my Spoon stuff.....way too much, but it was well worth every. I spent $600 for a brand new Spoon Sports cluster just to give you an idea. Hope this helps



Modified by spoonek9 at 1:47 AM 4/13/2004

 

vtec 5800, redline 9600. wheres the quote button? I've been looking for it also!

 

I have a 4800 vtec engagement on my d16z6.

When I had my b16a, 5000 was the best for me (I/H/E). I think the 5700 on 99-00 Si's is a bit high for my preference (Stock internals).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SC0TT &raquo;</TD></TR><TR><TD CLASS="quote">I have a 4800 vtec engagement on my d16z6.

When I had my b16a, 5000 was the best for me (I/H/E). I think the 5700 on 99-00 Si's is a bit high for my preference (Stock internals). </TD></TR></TABLE>

I agree with this guy

 

5700 on the ITR motor is high also. From the dyno's I've seen, ITR motors saw a smoother torque curve by moving it down to the mid 4k RPM and a little fuel tuning.

 

with a stock b16 vtec engagement is pointless under 5300...that is where mine is set...anywhere under that its like u cant even feel it kick in

 

If you are running stock valve train, its usually best to leave it where Honda put it. They didn't mess around when they put it in there. The only time when you have to start worrying about your vtec engagement time is when you start messing with different cams. Because the primary lobe is specific to smooth idle and low end power, as well as the secondary lobe for high end power. Generally speaking, the primary lobe starts to choke off the engine, at a certain point but provides great back pressure/valve overlap until you get to that point. Once it is out of its effeciant range, you have the secondary lobe.

A good way to witness this for yourself is if you have... say, a 94 civic ex (d16z6) with just intake and the vtec eng. is 4800 (i believe). Here is the scenario... you are in 2nd gear cruising at about 2500rpm and you step in it up a slight grade. Listen to the car at about 4400 it sounds like its struggling (high pitched tingle to it)... then once it hits 4800 the tone of the intake is Much much deeper and you feel a bit more pull.

Using this same strait is a good place to mess around with your engagement point, keep the tingly sound to a minimum, as well as keeping the low tone not too low, because you don't want your car to bogg. bogging = bad...


Basically... intake exhaust, and headers change things a bit because Honda designed their vtec timeing around the very restrictive components. And the vtec has to work against the pumping loss. And its worse for us Californians... hahah.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ea_b16hatchie &raquo;</TD></TR><TR><TD CLASS="quote">with a stock b16 vtec engagement is pointless under 5300...that is where mine is set...anywhere under that its like u cant even feel it kick in</TD></TR></TABLE>

You don't want to "feel" it. You want it to be smooth.

 

Mine is currently set at 5800rpm with a VAFC.

 

mine kicks in at 7600rpm and redline is 11400 rpm ... not sure ho you plan to use this info. Perhaps you can be more specific about your question ?

greg