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Howdy y'all. Today was the first day I started working on my new (formerly my sister's) 91 240SX LE. When the sun set I found this forum and just spent an hour reading around. I'm too poor right now to add anything major to the 240, but there's plenty of minor work to keep me busy for awhile. The first thing I will spend money on is a custom ECU or whatever it takes to bust that 120 mph fuel cutoff crap. Anyone have any advice? It sure would be sweet if I could just cut one wire...
 

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Get an auto ECU from any DE engine. That does it without disabling your tach or speedo. I think there is a wire that you ahve to crossover on the install, but I'm not sure which one.
 

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kaptainkrollio said:
Get an auto ECU from any DE engine. That does it without disabling your tach or speedo. I think there is a wire that you ahve to crossover on the install, but I'm not sure which one.
since his is a 91 LE, doesnt it have the E not DE?
 

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89-90 E, 91+ DE
 

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Thanks all. Before I go blindly rummaging through the local junkyards, if anyone has a source please let me know. If anyone has an exact description/part number please let me know. I only have the service manual for my car.
 

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You can also cut the wire leading to the ECU:
240sx.org said:
After reading the first solution I looked into finding a simpler solution. Best of all, everything can be done at the computer. My car is a 89 with a 96 ka24de, but all the wiring and computer is 92. On my computer, there is a yellow wire with green stripe, 8th one over from right on harness. This is the vehicle speed sensor signal. Cut that wire. That is it. If you have a California car I think it will trigger a code, but for the rest of us, it is an easy trick. Your speedometer will still work because the signal comes from the tranny, goes to the gauges, THEN feeds the computer. I had to find a solution because my car comes very close to the speed limiter at the end of the 1/4. If anyone can beat the revlimiter let me know. I'm working on it.
 

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Buy the Greddy Speed Limiter Cut from phase2motortrend for $60...I think you plug it in your ECu but im not sure...I'm going to buy it soon to get rid of my speed cut
 

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KaRdoN said:
there were some 91s that had the E.
More like 90 overstock... Weren't that many... Its as common as a skyline out here
 

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KaRdoN said:
there were some 91s that had the E.

NEVER.....you should know this better than anyone dude.... we are not talking about the Stanza.
 

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What wire would you cut to elimante the speed limter.
 

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240sxs1377 said:
What wire would you cut to elimante the speed limter.
The one that comes from the speedometer in the gauge cluster to the ECU. I think it's the fourth from the right on the top row on 91-94 ECU's.
 

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240sxs1377 said:
What wire would you cut to elimante the speed limter.
i hope you dont plan on keeping the car on the road after you do that. you just need a piggy back system, its a lot safer.
 

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Read my post. Top eliminate the rev limiter, just cut the middle two wires coming from the tranny., it's on www.240sx.org as well.
 

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Why wont i be able to stay on the road if i cut the wire will it kill my speedo and my tachometer?
Also if i cut the two wires on the tranny wont they take away my tachometer?
:rolleyes: Ill look into the piggy back thing or another safer route then taking away my speedo and my tach.
 

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You will still have your tach and speedo if you cut the correct wire.
 

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i just really think its stupid to do that, unless its a race car, seriously, unless its going to be track only, you dont need to go over 100, and i doubt you'll make it there without the cops coming after you. and beleive me, they can go a lot faster than 120.
 

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ive hit my cut off speed plenty of times and i havent been pulled over ever im just smart about doing it and not doing it on busy roads. So if i cut that wire it wont hurt any of the gauges it just takes the speed limter off.
 

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i really dont know what the hell you guys talk about speed limiter.......u hit top on my s13 and i still hit the gas and the revs go higher, meaning its still going up and up and up..... i tested with another friend that has a 04 neon SE, and they mark 140 mph i think......he said he was hitting above 120 and still was behind me for a good while.....no this was not done on the public streets like some idiots do..........we did it in the airport! jajajaja......well the part that is no longer in use....


Kids dont try this at home! all this was done by profesionals :fluffy:
 
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