I have 2 DX (PM5) ECUs. As far as I know they are both stock and I can't find any evidence that they've been altered.
Nevertheless, one hits the rev limiter at 6400 and the other goes to 6800.

So what is going on?
Where does your limiter hit?

Thanks

 

When I had my DX motor, I think it kicked in at 6500 rpms if I remember correctly.

 

6500 when I had my DX

 

6800

 

At least this proves that there are two different limiters out there in PM5 ECUs.

Any ideas? Sedan vs. Hatch vs. CRX maybe?
Or maybe it was a model year thing?

Converted... What year was yours and was it a hatch or CRX?

 

The different numbers can also be attributed to the stock tach being off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">The different numbers can also be attributed to the stock tach being off. </TD></TR></TABLE>
agreed- my stock tach on my ex is off by 200-500 rpm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SC0TT &raquo;</TD></TR><TR><TD CLASS="quote">6500 when I had my DX</TD></TR></TABLE>

1988 CRX DX

 

Mine doesn't hit the limiter. It just stops revving/making power.... heh

 

zdyne told me the stock rev limiters changes as the tempature changes. even if the temp gauge is all the way warmed up, it might still be hitting a "cold" limiter. my pm5 would hit 6800 fully warmed up and something a little bit lower when it had just warmed up.

 

alls i can say is my dx for a fact went till 6800 never driven it like that when its cold so i dont know about that.

 

dont remember exactly but over 6500 indicated for sure. 6800 sounds about right.

with the si ecu my car hits the limiter at ~7200 indicated

 

when i had my dx, it hit at 6800.....either way it's still slow

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evilryu530 &raquo;</TD></TR><TR><TD CLASS="quote">when i had my dx, it hit at 6800.....either way it's still slow</TD></TR></TABLE>
my std went up to 6800... sucked and took a while to get there tho!

 

my std hits the limmiter at 6500 on my aftermarket autometer tach wired o the ecu.

 

my revlimiter is at 6800

 

1st gear 35mph 2nd 62mph 3rd like 90 haha i dont have a tach

 

my DX never hit the rev limiter....when i had it........but thats just because i swaped a motor before it ran again

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91sleeper &raquo;</TD></TR><TR><TD CLASS="quote">1st gear 35mph 2nd 62mph 3rd like 90 haha i dont have a tach</TD></TR></TABLE>

that works too...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shorty91 &raquo;</TD></TR><TR><TD CLASS="quote">zdyne told me the stock rev limiters changes as the tempature changes. even if the temp gauge is all the way warmed up, it might still be hitting a "cold" limiter. my pm5 would hit 6800 fully warmed up and something a little bit lower when it had just warmed up.</TD></TR></TABLE>

I know the Si's are like this. They do indeed have a cold and hot revlimiter.

 

This thread has succeeded in confusing me even more.
Apparently some of the ECUs rev to 6400 and some to 6800. This would support what we discovered in dyno testing as well.
Now, if we could just figure out how to identify which ones rev to 64 and which ones rev to 68, we'd be golden.

From what I've learned, "LowBuckEF" probably has a PM9, which appears to be a 1991 only item (maybe some late 90 models). I'm not sure what or if there are any differences between it and the PM5 though.

Actually I've learned alot from this thread so far. Mainly that this isn't going to be as easy as I'd hoped.

 

i got a 89 crx dx and its 6800

 

mine was an 89 as well at 6800

 

90 crx dx 6800 when i had the stock ecu. Now it's 7200 with an SI. which by the way i'll be selling in about 2 weeks after i do my B swap, so if someone wants all the parts for an mpfi conv lemme know.

 

my rev limiter hit 8200 on my pm6 ( it was chipped and had a built head...hehe)