i recently put in an ex gauge cluster in my civic dx with a b16. but the tach says im at 5900 when i cross over to vtech. is my vtec coming in late or is my tach of (i believe its my tach).

how do i know when to shift then. the redline is at 8200 rpm correct? so would i just add 400rpm to that or would that be a bad idea? where is the rev limitter in a b16a2 with a p30 ecu?

 

the tach is off-Honda tachs are notorious for being up to a few hundred RPMs off.i'd get a shift light.to find where on your tach redline would be,i'd slowly take the car up to the rev-limiter and see where the needle is at-then you'll have a pretty good idea.
chris

 

then i try to shift a little before the limitter or a couple 100 rpm before it?
(is the rev limitter at the optimal point to shift or after it)

 

I know for a fact my tach is off right around 250 RPMs in my EX cluster sitting in my DX hatch. I have some OBDII software so I can go in and watch what all of the sensors are actually telling my ECM.

 

b16 vtec cross over is about 5900 rpm, 5700 at the earliest i belive and redline is 8,000 not 8,200rpm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v63000gtv6 &raquo;</TD></TR><TR><TD CLASS="quote">i recently put in an ex gauge cluster in my civic dx with a b16. but the tach says im at 5900 when i cross over to vtech. is my vtec coming in late or is my tach of (i believe its my tach).

how do i know when to shift then. the redline is at 8200 rpm correct? so would i just add 400rpm to that or would that be a bad idea? where is the rev limitter in a b16a2 with a p30 ecu?

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

ok first off... To find your rev limiter just rev it up semi slowly till bout 8K and when it "bouces" then you will know.
secondly on you, if your rev limiter is at 8K you wanna shift too 8400?? How the Rev limiter Limits the revving past 8K sooo
Next, a Good shift point on the B16's is around 7800 thats when Fuel cut off is I belive, Feel free to correct me if im worng.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civiksiracer1 &raquo;</TD></TR><TR><TD CLASS="quote">

ok first off... To find your rev limiter just rev it up semi slowly till bout 8K and when it "bouces" then you will know.
secondly on you, if your rev limiter is at 8K you wanna shift too 8400?? How the Rev limiter Limits the revving past 8K sooo
Next, a Good shift point on the B16's is around 7800 thats when Fuel cut off is I belive, Feel free to correct me if im worng. </TD></TR></TABLE>


i think fuel cut off for my 00 si is 82xx becuase I've taken it a little past 8100 before and the rev limited didn't hit so ya

 

fuel cut off defenatly is not 7800, when redline is at 8,000

 

b16 redline is 8200. a good shift point is 8000-8100. and no the fuel cut off is not 7800 on a b16. 5700 to 5900 should be about where your vtec cross over should be, unless you put a vtec controller on it. some applications work better with a higher vtec cross over. mine is a perfect example. my vtec cross over isn't until 6000-6100 depending on what i have my vtec controller set at.

 

VTEC engagement point depends on the ECU; not all B16A ECUs are the same. My USDM B16A2 engages VTEC around 5500-5600 RPM according to the tach. My emissions test report shows that my tach reads about 200 RPM higher than the actual engine speed.

USDM B16A3 and B16A2 redline at 8000 and cut fuel at 8200.
JDM 1st-gen B16As redline at 8000 and cut fuel at 8200.
JDM 2nd-gen B16As redline at 8200 and cut fuel at 8400.

 

redline is not 8,200 on b16!!! it is 8,000. dont get redline confused w/ revlimiter. big difference.

 

If ur want to shift at 8200 get a 8k pill with a shift like will work perfectly

 

wow, i cant believe there is so much disagreement. if you dont know the answer for sure, dont post.
i have a 2nd gen Sir b16a (jdm) with a p30 ecu.
all the sites that sell my kind of engine say 8200 redline.

now all i want to know is if redline is where the rev limmitter is or is the rev limitter later. i believe it is later, but i need an exact answer. please only post if you know for sure. the problem im getting now of mixed beliefs is the same problem i had when searching.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civiksiracer1 &raquo;</TD></TR><TR><TD CLASS="quote">

ok first off... To find your rev limiter just rev it up semi slowly till bout 8K and when it "bouces" then you will know.
secondly on you, if your rev limiter is at 8K you wanna shift too 8400?? How the Rev limiter Limits the revving past 8K sooo
Next, a Good shift point on the B16's is around 7800 thats when Fuel cut off is I belive, Feel free to correct me if im worng. </TD></TR></TABLE>


ok.. the reason i was saying to add 400rpm was because of the inaccuracy of the tach. if the redline was 8k and the tach was 400 off, i would believe the redline is where the tach says 8400. sory if i wasnt clear about that.
But i do believe redline is at 8200

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v63000gtv6 &raquo;</TD></TR><TR><TD CLASS="quote">wow, i cant believe there is so much disagreement. if you dont know the answer for sure, dont post.
i have a 2nd gen Sir b16a (jdm) with a p30 ecu.
all the sites that sell my kind of engine say 8200 redline.

now all i want to know is if redline is where the rev limmitter is or is the rev limitter later. i believe it is later, but i need an exact answer. please only post if you know for sure. the problem im getting now of mixed beliefs is the same problem i had when searching.
</TD></TR></TABLE>
You're correct, the rev limiter (fuel cutoff) is set a few hundred RPM after the redline on the tach. The redline is not the fuel cutoff. There are too many people who are confused on this . . .

The 2nd-gen JDM B16A has a redline of 8200 RPM and a fuel cutoff at 8400 RPM. This is a gauge cluster from a JDM '92-95 Civic SiR, with the 2nd-gen JDM B16A engine:



You can clearly see the redline at 8200 RPM. To check the rev limiter, simply run your car through 1st gear all the way until the fuel cuts.

If it was a 1st-gen JDM B16A, or any USDM B16A, the redline would be 8000 and fuel cutoff would be 8200.

Don't worry about the inaccuracy of the tach - you're thinking too hard.

 

thanks