Before my 5AT Z, I had a 6MT G coupe. It rev limited about 6900 or 7k rpm. After having the entire Crawford package installed (except ECU), the 'ol redline approaches much more rapidly than it did before (not a bad thing, mind you). I went to pass another car and an 18 wheeler on a two lane highway a couple days ago, and on straight acceleration in 3rd gear, hit every bit of 7200 before letting off on the throttle (it happened b/c I'm so blessed used to a manual that I keep thinking the 3-4 shift should be pulling the shifter back toward me, rather than pushing away from me as on the manumatic; stupid me pulled back on the shifter twice while still accelerating and wondering why the tranny wasn't shifting before I realized what the problem was--D'oh!), and NO REV LIMITER!

I called Doug at Crawford, and he thought that if it didn't kick in before 7200, they had probably left it off when they programmed the ECU. He told me Nissan had left off the top end governor on at least one person's Z, so the factory ECUs aren't perfect. I really have three questions:

1. After reading dozens of posts about the rev limiter, I haven't found a soul w/o a rev limiter AT ALL. Does anyone else have this "problem"?

2. I don't really want the rev limiter to kick in at 6700 at the tach redline, but I don't want to blow up my engine either. Do you guys recommend leaving it alone and enjoy not being restrained by the too low existing redline; try to get the dealer to replace the factory ECU under warranty; or get the new ECU coming out from Technosquare for the newer build dates (my build date is 3/04), which is supposed to be rev limited at 7200? Doug thinks he and Technosquare need just a little bit more of my money.

3. For those of you who already have a Technosquare ECU, I know it comes w/a guarantee against engine failure, but do you know anything about the stability of the company, and how long they've been around? If they file Ch. 11 in a couple years, I don't think individual car owners' claims would rank high on the list of unsecured creditors.

 

Ive heard manual guys saying they hit 7000 or so in manumatic mode. I dont know why.

as for nissan "leaving it off" to my knowledge of circuitry and programming; that would be 99.9999% impossible; and that last percent would be like frickin evolution that the code was corrupted and rather than failing, in a massive miracle the rev limiter was removed with no ill effects. (read as: no way)

if I had to explain it, Id wonder if your tach needle was accurate. in idle are you saying if you step on the gas, itll just rev to 9000RPM? go try; I have a feeling itll hit a rev limiter somewhere; or you were just mistaken and it was actually at 6600-7000. but I wasnt there; so go check.

 

Not sure if you are talking about actual limiter or just the indicator, but if it's limiter? That sounds like a good thing to me....:-) p.s. Well at least for having fun. Maybe not so good for the tranny and engine.....

 

I THOUGHT I had gotten it up over 7k before, but Tues. night, I KNOW I did; I was watching the tach like a hawk on that pass. Yes, I've checked it at idle; it hums along happily at 7200, and b/c that's the majority consensus as to how high it's safe to rev it, I ain't goin' over it. Can the dealer tell me if the tach is off? I just can't believe that it could possibly be off 300-500 rpm. If it's there but kicks in at 9000, I guess I'll never know. Can you honestly tell me that if you had my problem, you'd rev it to 9k to find out, even at idle? I know revs are harder on an engine under load, but c'mon; the Z isn't an S2000.

 

i believe you, but take a pic next time.

 

In my line of work, we would ask if someone has a motive to lie before challenging their credibility. After reading umpteen posts where some guy is immediately ridiculed, i.e., "you must have looked at it wrong," "you're just making it up to impress everybody," etc., why in the world would I post with a made up story about this, especially if Technosquare will let you rev just as high as I did before their rev limiter kicks in?

As for the pic, part of me is offended you asked, but another part of me wants to show you one. I am not in the least tech-savvy. I don't know how to post a URL; I don't know how to post a pic; and I don't even know how to use our digital camera (although my wife tells me it was worth the fortune it cost because it has lots of mega-somethings). Perhaps I'll either take an old-fashioned film photo and show some of the Crawford guys or drive by the place and let them do a ride-along, so my "witnesses" can post. Good grief, you'd think I was bragging about it or something. Alright, guys, for my next posts, I'll tell you about being abducted by aliens; the recent seance at which I spoke with my long-dead grandfather; and how I'm really Elvis' illegitimate love child.

 

no rev limiter is fine as long as you know how to drive...

our race cars have no rev limiter at all but everyone can miss a shift and blow a rod...

 

A rev limiter won't help you with a missed shift. I saw somewhere in the neighborhood of 8500, well past the end of the tach scale when I accidentally went from 3rd to 2nd on the dragstrip!

 

Alright, ares and Jun, upon mucho further review and "testing," I'll have my crow broiled w/a little lemon pepper, braised w/a delicate white wine sauce. Simply put, I WAS WRONG on two counts, and I'm not going to wuss out about and either try to PM you or just remain silent and hope the thread dies. I've had much worse public humiliation, although most of it in grade school.

After allowing myself to be sucessfully gigged by you and Jun, I headed back out to the garage for more testing, and sure enough, I hit "the line" yet again, and the engine shows no signs of stopping. Of course, I'm then thinking of hiring a professional photographer to shoot the tach and/or calling in witnesses who can post ("Ah hah! I'll show them all!!," the little voice in my head was screaming).

At this point, I can't resist, and I decide I'm just going to push it a little farther and see if I do, in fact, have a rev limiter somewhere out there, as ares suggested. I slowly push the revs over "the line" about 50 rpm or even less, and the limiter immediately kicks in. Oh, well, I think, I might have been wrong about that one, but at least I don't have the worry of overrevving it past 7200, which is a relief, but I'm still wondering how the tach needle can be that far off (300 rpm, assuming that my late build-date 5AT has the 6900 rpm limiter installed that many on here have reported).

Happy I can get the car to 7200 w/o worrying about overrevving it, I goose it up to "the line" yet again and hold 'er there, glorying in my rightness. It was at this point that I began to notice which yellow line on the tach near the "7" was just a little wider and darker than the others. I look closer and count the in between lines and look at the numbers again; at this point, quoth the raven/crow in my head, "Crap, dude, you DID look at it wrong!!" I checked it again today under load, and it kicked in again at what I now know is the 7k line. Unfortunately, I can't even defend myself w/the 'ol "It happened only once; it happened quickly" line. I've had the car about 2 months, and from the time I first test drove it, I thought the 7000 line was really the 7200 line (no, don't ask me how I never had a problem like that reading the tach in my G; I don't know).

Finally, I can now easily believe that my ECU was set to rev limit (and probably does) at 6900, but that the needle was about 100 off, especially with all the problems some have had with the speedometer needle being a few mph off of the digital speed readout, and at least a couple others reporting about 7k rpm on the needle as well.

Oh, well, at least I know I have a rev limiter and how to read my tachometer now. My dogs still love me, and consider me comparatively intelligent. I can also console myself with the thought of how bad the flames would have been if I HAD managed to get someone to take a digital picture of the tach needle at 7000 rpm and post it for me, along w/ a "here's my proof she'll go up to 7200." SO, in the immortal words of Gilda Radner, "Never mind!"

 

misshift as in not getting it into gear... if you have a rev limiter it will keep you from over revving it while not in any gear...

now, shifting into 2nd gear rather then fourth at 90 miles perhour nothing can help ya there...

ive done it... its not fun.. hehe

 

Yea, Ive noticed that when I revved my engine with the car not in gear that It will actually go into redline ( I believe the farthest Ive gone in was maybe 200-500 over redline, I was wondering if that was possible when it happend) but still...I thought the car did have some type of rev limiter?