I repeat, factory fuel cutoff is at 5.5 this is a well known fact. Also, I am not getting my mph spec from my car, but from the actuall factory number. I certainly wouldn't be telling you what the rev cut ocurrs at in my car, because I know that the stock tach is very inaccurate, as well as the speedo. When you say that your speedo is "off by a factor of .4mph/1k rpm", this may be true, but realize that when speedometers stop being as accurate, thei'r reading is often not that linear. My last 240sx read high at low speeds, and low at high speeds. Im gonna stop posting in this thread because it's a waste of time. You aren't gonna want to go faster than 115, unless you have a good suspension setup, more power, and better brakes. My car feels very stable and controllable at over 100, but that is because it has coilovers, subframe spacers, 16" wheels with stiff, high speed rated tires, among other things. I really don't think anyone in a stock 240 should be hitting those speeds. Big floppy tires and suspension could get you in trouble fast.rsmithdrift wrote:I cut my fuel cut off and disconected the 4th and 5th gear sensors at my transmission. So I have gotten to 6.2k rpm (hwy 111 going down Signal Mtn). If my speedo went that far it would be 149mph. But my speedo is off by a factor of .4mph/1k rpm. So By using gear ratio and tire size and whatnot. that is actually 146.8 mph give or take due to tire warping.
On flat ground my car can go 115 in 4th at 6k or something. In fifth I am only at just under 5k. That is were my fuel cut off USED TO hit.
Naed240sx: You have the wrong sized tires on your car, or your speedo is WAY off. You are going 130 at 5.5k rpm if you have 205/60r15's on your car. End of story.
112 at 5.5k is total BS!!! If that were true you would be at 4k at 75mph. It is well noted that 240's hit 70-75 at 3k rpm. You are very wrong.
5th Gear Speed to RPM Ratio in a 240sx.
Re: (rsmithdrift)
Re: (naed240sx)
I believe the point of this thread was to find out how fast the 240sx could theoretically go with the factory drivetrain. No one is claiming that we should all go to top speed runs to verify these numbers. There is no need to get worked up over nothing. Even with a lower suspension and speed rated tires, it is still not safe on public roads.
With that said, you do make a good point about the factory cut-off at 5500rpm. I always thought the speed was 118, not 112. Nevertheless, the speeds and rpm simply don't match up. The math doesn't lie, nor do the factory claims. There must be something we are missing here…
With that said, you do make a good point about the factory cut-off at 5500rpm. I always thought the speed was 118, not 112. Nevertheless, the speeds and rpm simply don't match up. The math doesn't lie, nor do the factory claims. There must be something we are missing here…
Re: (nismofly)
Ahh ok. I had forgotten what kind of cut ocurrs at 112, thought it was fuel, and had heard that it was at 5.5. This makes more sense, and matches the math.nismofly wrote:the ecu speed cut is at 112, or 118, or whatever it is...the fuel cut is at 5.5k, approximately 132 mph
Re: (nismofly)
I dunno, all I know is that I remember hearing that fuel cut is at 5.5, at 112-115. My tachometer seems to agree with this. Before I had my 4.4 vlsd in, it would hit at around 112, at 5.5, and it is still at 5.5, only at a lower speed.
Re: (nismofly)
Thats what it appeared to be, but as I said, I have seen many very inaccurate 240sx tachs.nismofly wrote:so what youre saying is, and what i dont get is, you were hitting 5.5k at like 112? ive had my car up to about 110 and its between 4200 and 4300...
i need to get rid of the first one so i can stretch it to 130 when i go to the glen
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BobWithBoobs
- Posts: 318
- Joined: Wed Dec 29, 2004 6:27 am
- Car: 89 couple with s14 dohc swap.
Re: (BobWithBoobs)
they all have it, except for the automatics, but those suck anyway.BobWithBoobs wrote:does SE have a speed cut? only reason i ask because ive heard of cars (ss's and what not witch dot have them factory removed just because it is a SS. like the 05 cobalt
let me know
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BHayes_S13Coupe
- Posts: 168
- Joined: Wed Mar 24, 2004 5:30 am
- Car: 1990 Nissan 240SX (Coupe)
Re: (naed240sx)
I have a stock 1990 Nissan 240SX, SOHC, and open diff, 5 Speed manual. My rear tires are 25.6 inches tall in diameter. At 65 mph I'm cruising at 3000 rpm or so. Does this seem right?
Re: (BHayes_S13Coupe)
Same here 65 is like 2950rpms...so about 3000. I have 205s in the back. Is everyones S13 like this? Hell, is the SR the same?BHayes_S13Coupe wrote:I have a stock 1990 Nissan 240SX, SOHC, and open diff, 5 Speed manual. My rear tires are 25.6 inches tall in diameter. At 65 mph I'm cruising at 3000 rpm or so. Does this seem right?
Re: (oki_bum)
Sounds about right but...SR is the engine, speed at a given RPM is from the gear ratio's of the trans and diff205 is the tire width, and doesn't tell you anything with out the aspect ratio, the second number (205/60/15), which is the percentage of sidewall in comparison with the width of the tire(in this example the sidewall is 60% of 205mm)