speed limitation

[Outofrange]

Why does my 89 240SX SE shut down around 115mph and how do I remove this limit?

[KDashy]

There are ways to get rid of it (like cutting wires) but why would you want to go any faster? do you autocross?

[Outofrange]

I like to have the option to if I want to. How though?

[Florida240sx]

Yea you can cut wires. One guy's instructions worked on his car. Someone who read it worked with theirs also. But then someone else made it to where he didn't have 4th or 5th gear. Still looking for the correct way to cut wires. ALso you can just get a new ecu. Also will give you more hp if you go that way but more expensive than just cutting a few wires. I"m tired of topping at 115mph too. I have had mine as fast as 135mph. For some reason I can trick my car sometimes. Love watching the needle buried and still gaining speed. Only way a honda has beaten me so far. 3mile race starting at 60mph. Actually now that I remember I was the first to get inside Wendy's.

[niznos]

The cut wire trick is for the DOHC's. Your SOHC's will require a remapped ECU, or one from a SOHC automatic 240SX. I have done this, and it works. Those are the only ways that I've found. If you do the cut wire trick to a SOHC, it will go into safe mode.

[frapjap]

The cut wire trick is for the DOHC's. Your SOHC's will require a remapped ECU, or one from a SOHC automatic 240SX. I have done this, and it works. Those are the only ways that I've found. If you do the cut wire trick to a SOHC, it will go into safe mode.

Thats an awesome tid bit of information, that is soooo going in the notes section of my chiltons should I some day no be satisified with 115 mph. Doubful, I haven't pushed much over 90 because I am afraid of the motor going. I have 90k, and I hear amazing things, I'm just not sure how much it'll like it.

[masticatingcow]

Thats an awesome tid bit of information, that is soooo going in the notes section of my chiltons should I some day no be satisified with 115 mph. Doubful, I haven't pushed much over 90 because I am afraid of the motor going. I have 90k, and I hear amazing things, I'm just not sure how much it'll like it.

JUST 90K? Wow. I wouldn't worry if I were you. 90k is a YOUNG engine.

[frapjap]

Thanks, I guess I worry a bit. I race it, but after something stupid happens (check out my post about the spark plug problem) I get really pansi-ish about the car and drive it all boring and economical.

[Veritas]

I used to race mine till i got to around 24k and then things really started falling apart, mainly my transmission.

[frapjap]

I'm not to hard on it. I've done like two donuts and two one-eightys. Very rarely will it pass the 5 grand mark, but I am getting a 2.5 in exhaust tomorrow morning, so I'm sure I'll be having the time of my life....for the little time I have between there and work. I can't wait. After that its differential time! Sooner or later a header, bit it'll be a while for that one. I do the car in stages like. It feels fast, then its not fast enough after a few weeks, then I do some more work, then its fast for a while, then its not fast enough. Then I find better ways to get the power to the ground, the diff. Next BIG cheap project I am doing (thats free) is porting my intake manifold. I've dumped nearly a grand into the car and I've had it for like a month. I love it to much!

[Veritas]

Whats really fun is finding an old municiple airport and setting up a corner with stuff and trying to drift around it. Some reason, its hard to get the car not to turn too much. I used to do that a lot untill the last time two cops showed up and then my first sergent got a call from the mayor saying he was pissed. But it was fun for the time being.

[frapjap]

Thats neat. We used to have an abandoned airport. they made it something or other now.