I could've sworn that the rev limiter for the B16A was 8200 running with a P30 ECU but for some reason, mine cuts out at 8000. The IAT valve is bad but that should have no effect on the rev limiter... I think. Anyone have any idea wtf is going on with my car?


Modified by JDM EJ2 at 1:36 PM 1/15/2008

 

It's actually your rev limiter that you are talking about.

 

Yeah, wow, I'm retarted.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM EJ2 &raquo;</TD></TR><TR><TD CLASS="quote">I could've sworn that the redline for the B16A was 8200 running with a P30 ECU but for some reason, mine redlines at 8000. The IAT valve is bad but that should have no effect on the redline... I think. Anyone have any idea wtf is goin on with my car?</TD></TR></TABLE>

yes, it's 8200 running on a P30. maybe you're shifting to fast to noticed the 200 more rpm's. looking on the tach, it's easy to over look.

 

are you sure your tac is right on? ive seen a few that with an autometer was 1-300 rpm off either way.

 

you just need to tune your ecu and move the rev limiter up to about 8700 so you can redline your motor.

 

Yeah, I have the JDM Cluster for the engine and it shows the rev limiter and I'm clearly not touching it. I've had 2 people watch as I hit it and it doesn't touch. I'm legitimately confused because it makes no sense.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM EJ2 &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, I have the JDM Cluster for the engine and it shows the rev limiter and I'm clearly not touching it. I've had 2 people watch as I hit it and it doesn't touch. I'm legitimately confused because it makes no sense.</TD></TR></TABLE>

it's really not a big deal. it's also not necessary to hit the limiter. if you hit 7200-8000, you'll be fine. the motor will still be in vtec when you shift into the next gear.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egSLEEPER &raquo;</TD></TR><TR><TD CLASS="quote">you just need to tune your ecu and move the rev limiter up to about 8700 so you can redline your motor. </TD></TR></TABLE>

I don't see the point of moving it up to 8700. Chances are his is set at stock anyways, and on a stock motor, why move it up so high? That's just asking for trouble IMO.

 

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

I don't see the point of moving it up to 8700. Chances are his is set at stock anyways, and on a stock motor, why move it up so high? That's just asking for trouble IMO.</TD></TR></TABLE>


x2

 

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

I don't see the point of moving it up to 8700. Chances are his is set at stock anyways, and on a stock motor, why move it up so high? That's just asking for trouble IMO.</TD></TR></TABLE>

i was just giving him an example of where to set a rev limiter ABOVE the redline of 8200. 500 rpm above redline is typical for the rev limiter anyways.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egSLEEPER &raquo;</TD></TR><TR><TD CLASS="quote">

i was just giving him an example of where to set a rev limiter ABOVE the redline of 8200. 500 rpm above redline is typical for the rev limiter anyways. </TD></TR></TABLE>

it's really typical? i mean, my wifes saturn limiter is about 6500 and my B16 is at 8200, but i guess you know something the automaker don't. 500 rpm's more is enough to ruin something, actually taking it to 8000 - 8200 often is enough to ruin something.

there is absolutely no reason to take it that high, especially on a stock motor.

 

im confused about what were discussing... if your motor redlines at 8200 you dont want the rev limiter set for 8200 or you wont get your complete rev. am i misunderstanding what were talking about here?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egSLEEPER &raquo;</TD></TR><TR><TD CLASS="quote">im confused about what were discussing... if your motor redlines at 8200 you dont want the rev limiter set for 8200 or you wont get your complete rev. am i misunderstanding what were talking about here?</TD></TR></TABLE>

yes you are. on a stock motor, there is no reason to rev that high. the OP wants to know why his limiter is on at 8000 instaed of 8200, where honda has set it.
now, when you said you won't get you complete revs, what do you mean?

to reach maximum HP, you do not have to hit the limiter. most motors hit there max HP way before the limiter, anything else is over kill.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM EJ2 &raquo;</TD></TR><TR><TD CLASS="quote">I could've sworn that the rev limiter for the B16A was 8200 running with a P30 ECU but for some reason, mine cuts out at 8000. The IAT valve is bad but that should have no effect on the rev limiter... I think. Anyone have any idea wtf is going on with my car?


Modified by JDM EJ2 at 1:36 PM 1/15/2008</TD></TR></TABLE>

The IAT could very well have an effect on the rev limiter. Air fuel tables are derived from the MAP, IAT, and TPS largely. It's a speed density system. To know how much fuel to inject, the ECU needs to know the air temp (density), and MAP and TPS (speed).

It may either be freaking out and going into "limp mode", or it may just not know how to adjust the air/fuel tables THAT FAST with no IAT. Remember, without the IAT, it's guessing. 8000RPM = 133.33 times/second of crank revolution. I'd say it's a pretty fast guess anyway.

Fix your IAT. Your tach may also be off.

 

i have noticed that on a tach when you redline, (lets say a d16z6 in a stock 94 si) it doesnt hit the rev limiter until about 3-500 rpm after 7200 like the redline shows on the tach. if the limiter was set for 7200 it will limit too soon you wont be able to redline completely.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by philosofy1 &raquo;</TD></TR><TR><TD CLASS="quote">

yes you are. on a stock motor, there is no reason to rev that high. the OP wants to know why his limiter is on at 8000 instaed of 8200, where honda has set it.
now, when you said you won't get you complete revs, what do you mean?

to reach maximum HP, you do not have to hit the limiter. most motors hit there max HP way before the limiter, anything else is over kill.</TD></TR></TABLE>

8200 is the stock B16A fuel cut as per honda. It's safe to take it there all the damn time. The reason to shift at fuel cut? To stay in the powerband for the NEXT GEAR. Not bogging in a higher gear is more important than shifting at the end of your power band in a lower gear. You only have to lug it out for like 400 or so RPM anyway past max. power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93egSLEEPER &raquo;</TD></TR><TR><TD CLASS="quote">i have noticed that on a tach when you redline, (lets say a d16z6 in a stock 94 si) it doesnt hit the rev limiter until about 3-500 rpm after 7200 like the redline shows on the tach. if the limiter was set for 7200 it will limit too soon you wont be able to redline completely. </TD></TR></TABLE>

not really, next time try to accelerate slow. when you get to the 7200 mark the limiter should kick in, not to mention the tach might be off. after thousands of miles, things don't work exactly they did coming off the lot.

and again, why do you instaed of speaking about getting complete revs and using redline completely, it is [B]COMPLETELY UNNECESSARY![B]

 

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

8200 is the stock B16A fuel cut as per honda. It's safe to take it there all the damn time. The reason to shift at fuel cut? To stay in the powerband for the NEXT GEAR. Not bogging in a higher gear is more important than shifting at the end of your power band in a lower gear. You only have to lug it out for like 400 or so RPM anyway past max. power. </TD></TR></TABLE>

i am aware of why the limiter is there, but to hit it all the time is unnecessary. if i shift at 7800-8000, my revs are still high. i'm stll able to keep the motor in vtec, not having not one problem with bogging. people just have to know how to drive that's all.

 

i understand the tach may be off but when the ecu is tuned correctly and timed off a light and laptop then you know your setting things correctly. i rev my car differently from others so if this guy is looking for 100% stock specs you got em for him. i was just telling him what i use and like.
i guess im just trashing my motor revving 200 rpm past the stock limiter on a tuned ecu wont hurt anything IMO

 

My bad, I expletiveed up when I wrote the post, I meant the rev limiter not the redline. I know I don't need it to rev all the way to 8200 but I just wanted to figure out why it wouldn't. Thanks for all the help tho...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by philosofy1 &raquo;</TD></TR><TR><TD CLASS="quote">

i am aware of why the limiter is there, but to hit it all the time is unnecessary. if i shift at 7800-8000, my revs are still high. i'm stll able to keep the motor in vtec, not having not one problem with bogging. people just have to know how to drive that's all.</TD></TR></TABLE>

is all you really need to rev to. thats all the higher the powerband is. if you really listen to your motor, you can hear a slight change in tone when you just pass out of the peak power. by listening to your motor, you can tell alot of things. if you really want to check, wire up a good tach and then see troubleshoot from there.

 

your tuned ecu is gonna fix your valve springs when they bind or you drop a valve. your not making power that high so there is no reason for it.

explain to me what your gaining from these extra 200rpms?

 

To answer the origional poster the ECU is the definative rule for rev limit and most factory rev counters are out (some but a little bit, some by a lot)
Unless someone has tweeked your ECU then you will be hitting 8200rpm but due to rev counter inaccuracy it only shows as 8000ish.

 

well actually the stock rev limit is set to 7900 from factory in the computer and the speedo will say 8200. I found that out when I went to the dyno a month back the guy said he's seen a few Honda's whit this set up they just do it like that I guess so you wont be tempted to rev to the sky