Any way to get rid of speed limiter?

[TJ_GT]

ok my speed limiter kicks in at 115mph i think... but is there anyway to get rid of that w/out getting a re-tune on my ecu? I was thinking since my speedo doesnt work i could just unplug the VSS for now. any suggestions? Oh to get my speedo to work do i need a 91+ cluster? i heard that the one in mine (89) doesnt work with the sr20det

[red240sx sr20det]

my 89 gauge cluster works fine there has been discussion of this before and supposedly you can cut a yellow and green wire but im not sure if it works.

[Jesse SR20]

Your speedo should work fine. Mine does (1990 w/ redtop). Check your wiring.

As far as the speed limiter, I've heard that the 63 auto ecu's don't have a limiter.

I've got one if you're interested.

[TJ_GT]

63 auto? sorry a bit of a noob when it comes to ecu's and stuff. if it works with mine i'm interested, how much you asking?

[TJ_GT]

my 89 gauge cluster works fine there has been discussion of this before and supposedly you can cut a yellow and green wire but im not sure if it works.

the yellow and green wire is cut but still no speedo, doesnt help the whole wiring harness is a mess because of the guy who had it before me

[teddy]

greddy and hks make a speed limiter cut. You just tap it into your ecu. I know the greddy is only like $60-70. these are always an option.

[eliterit]

i have a 63 auto ecu and i just found out today that there is a limiter sometime after 115 or so, or if my speedo is of, somewhere around 6500rpm in fourth with 215/50/15 tires

[HailtotheSilvia]

a guy i met in Houston once told me about this- first go buy a switch, that'll cost you like 5 bucks- between the speed sensor at the end of your transmission and the body harness, installed some kindna restrictor b/w the 2 to cut the signal from speed sensor to your ECU- once you hit 115 in 5th gear (or whatever the limiter is) flip the switch, your speedo needle will drop down to zero, since your ECU's not receving the signal..your car will keep accelerating.

don't quote me on this....the guy told me but i've never actually try it on my car yet

[wickedpelf]

i havent hit my speedlimiter? and i was playing with this supra 1993 on the interstate amd he told me we were going...alot over 115

[dfw240_EE]

It works by limiting the revs in 5th gear.

There is a 5th gear position switch on the transmission. Clip that and it will either think it's never in 5th gear or think it's always in 5th gear. I will look through my FSM to see which it is. If anyone knows which chime in.

[pgt892]

Like was said before, you can cut the yellow/green wire (pin 32) going to your ECU. The VSS sends the signal to the cluster, then to the ECU. So your speedo will still work, assuming it already does, but the ECU will not know how fast you are going. Worked for me without any issues.

[dfw240_EE]

I always thought that it cut your speed by limiting revs in 5th gear.

*I just looks up and noticed that I am in the SR forum, oops* Well rev limiting in 5th gear is how the KA24DE does it, and it is a "normally open" switch. So if you cut the 5th gear switch wire it will always think it is out of 5th.

Guess the SR limits speed directly from the VSS. 115mph seems a touch low. The KA24DE doesn't cut off until about 120mph.

[ETTInnov04]

I converted the JDM gauge from kph to mph just to see where my speed limiter was and it cuts out at 130mph. Its a 96 blacktop. I thought it was a little odd since i had always heard 115mph

[dfw240_EE]

Could be everyone was mis-converting from KPH to MPH.

[Blown240sx]

Mine cuts out around 130 also and Im running KA MPH gauge so I know its right. Im not totally sure its 130 but its past 115 for sure.

[SpeedRacer1]

63 Auto ECU's do have speed limiters somewhere above 115, around the 125-130 area iirc.

And the wiring for the speedo is the same for the SR as the KA. As mentioned before the signal goes from the speed sensor, to counterclockwise around the engine bay to the cluster, then down to through the dash wiring to the ECU.

[Luke]

Like was said before, you can cut the yellow/green wire (pin 32) going to your ECU. The VSS sends the signal to the cluster, then to the ECU. So your speedo will still work, assuming it already does, but the ECU will not know how fast you are going. Worked for me without any issues.

END OF THREAD. I'll confirm this works 100% without problems.

[eliterit]

cant wait to try it.

...i swear i wont reply anymore

[Luke]

Have fun, just be safety conscious when running at speeds above that.

[TJ_GT]

i just checked and my yellow/green wire is cut but it still cuts out and no speedo?!?!

[IanS]

just unplug your VSS, I had to do that cause my speedo was running double speed and the limiter kicked in at like 57 mph, it sucked, my new sensor isnt coming till next week either.

[got2b240]

dude, just cutting the yellow/grn wire going to your ecu is a bad idea, cause if you have an open BOV and a manual ECU, it wont activate the IACV to open right before you come to a stop.

Car will want to stall more.

My idea is to stage a relay with a zenier diode so that the ecu will only see a certain amount of voltage from that wire and not enough to trip off the cut-off

I work for an electronics company, and I have plenty of resources to make one of these for any one who is intrested.

I am also in the makings of having my company make turbo timers for our cars for CHEAP . Everything will be made by me in house.

Email me if intrested

[email protected]

[Beemen550]

ok i just tested this the other night, and i found out that my stock speed limiter was at 5000rpm's in 5th gear, so i cut the yellow/green wire and tried again and it went past 5000rpm's but i kept goin and once i hit 5800rpms the limiter hit again, i tried it twice to confirm and it was at 5800 rpm's which buried my speedo but it got there pretty quick. so does the sr20 have 2 or what cause the wire is cut and i cant go past 5800

i still have the jdm speed sensor in my 93' redtop, 89' car, with a 92 convertible cluster, but i just pulled the ka speed sensor from my old transmission and when i put it in im going to run a switch to the interior from the speed sensor and switch it when i need to go over 5000rpm's even though i wont need it much i just wanna know i can do it damnit

as for cutting the yellow/green wire making your car stall when u stop it, actually made my car idle even better, it idle fine already but since i cut the wire when i shift from any gear to neutral to stop it goes right to 800rpms and sits perfectly til i touch the gas, before it would drop to about 1100-1200 rpms then fall to 800rpm idle, but if i would would leave it in second and slow down to stop it seems like it gargles or grumbles alot more at low rpms

someone else cut there wire and tell me if u can get past 5800 rpm's

[Luke]

Ok, i'll list what I have just so you know what works. I have no experience with other SR's so maybe it's different...

94-98 180sx SR20DET BlacktopE5 ECUI used the KA lower transmission harness (all sensors including the speed sensor from the KA transmission were used on the SR). All I had to do was cut the yellow/grn wire. :-)

[sil80S13]

yeah thats the 5th gear limiter!..fortunetly mines use to be an autO! so i ditched the 5th gear limiter.. and it goes right past it... im tooo scared to go higher hehe..but yeah CUT the wire you'll be ok..if ur mechanically incline..get a chiped ecu, a stand alone, or a speed defencer. oh btw.. the stock sr does have a fuel cut...so you'll wont be making any more power at that speed. unless u have a fuel computer like me ^_^. remember on turbo cars...add more boost means add more fuel!.

[boost_creep]

i didnt cut the green/yellow wire,and i dont have speed cut.at least not at 115.but its never cut on me yet.i just disconnected the fifth gear sensor on the transmission.i have the soch speedo and it works fine w/ no speed cut.