Speed Limit Defender, 84 300zx turbo

adamlamaster · Sep 28th, 2004, 10:38 PM

My friend just ordered a Greddy BCC speed limit defender and we cannot figure out how to hook it up to the computer (ECU). Does anyone have or know of any place to get a diagram of the computer so we can see which wire controls the speed.

84 300zx turbo

0341TODD · Sep 29th, 2004, 07:54 AM

Holy crap dude, how fast are you going to go? I didnt know that there was a speed limiter on any of the Z's especially the 80's Z's. Some of the guys on this forum have had their cars to over 130 with no problems at all. A factory service manual would tell you what wire that you need to use though...........

Zen31ZR · Sep 29th, 2004, 12:36 PM

Quote:

Originally Posted by 0341TODD

Holy crap dude, how fast are you going to go? I didnt know that there was a speed limiter on any of the Z's especially the 80's Z's. Some of the guys on this forum have had their cars to over 130 with no problems at all. A factory service manual would tell you what wire that you need to use though...........

Speed is limited to 135-137 on all the turbo cars. The "purple wire" mod can defeat this , however you will lose all trip mileage/mileage-to-empty functions. No big deal. It's useful for those that can run faster than 130 in the 1/4. That's 10's , if I'm not mistaken.

'85 fairlady · Sep 29th, 2004, 01:03 PM

i've done nothing like that to my car and have gone 140 but then backed off.

Zen31ZR · Sep 29th, 2004, 01:10 PM

Quote:

Originally Posted by '85 fairlady

i've done nothing like that to my car and have gone 140 but then backed off.

I don't beleive the NA cars had a limiter , or maybe it was higher. The turbo cars definitely have the limiter.

asleepz · Sep 29th, 2004, 03:47 PM

Yep we hit ours once on the air base.

RocketRodent · Oct 2nd, 2004, 10:08 PM

N/A's dont have this limit... they just have a rev limiter to try to keep the speed down.... Still its good for 142 mph, yes downhill... (that the highest I've seen). Kinda scary considering the rust bucket was almost as old as I am.

Marc Z31 · Oct 3rd, 2004, 05:13 PM

...CUT THE PURPLE WIRE... it tastes like burning.

Turbo cars go 140... unless you cut the wire.
The 84 AE non turbo can go 165, yes 165. It takes forever to get there, but YES 165.

JAMESZ · Oct 3rd, 2004, 09:01 PM

Quote:

Originally Posted by Marc Z31

...CUT THE PURPLE WIRE... it tastes like burning.

Turbo cars go 140... unless you cut the wire.
The 84 AE non turbo can go 165, yes 165. It takes forever to get there, but YES 165.

Ummm you do know that the only NA 50ths were in Australia and none of them came to the U.S. The Shiro was taken to 155 by Nissan but there is only gearing to about 160 then were dead. The NA cars can't even go as fast as the turbos plus the NA would lose the battle with friction way before 165.

Zen31ZR · Oct 3rd, 2004, 09:13 PM

Quote:

Originally Posted by Marc Z31

...CUT THE PURPLE WIRE... it tastes like burning.

Turbo cars go 140... unless you cut the wire.
The 84 AE non turbo can go 165, yes 165. It takes forever to get there, but YES 165.

I already mentioned this mod, thanks. And the difference between 135 and 140 is really basically nothing big.

asleepz · Oct 3rd, 2004, 09:27 PM

Quote:

Originally Posted by B@lliZtiK

I already mentioned this mod, thanks. And the difference between 135 and 140 is really basically nothing big.

Agreed your not going to notice at much as from 25 to 30 from 135 to 140

Zen31ZR · Oct 4th, 2004, 12:52 AM

Quote:

Originally Posted by RocketRodent

N/A's dont have this limit... they just have a rev limiter to try to keep the speed down.... Still its good for 142 mph, yes downhill... (that the highest I've seen). Kinda scary considering the rust bucket was almost as old as I am.

Most all cars have rev limiters.

The turbo Z31s is set at about 6400-6500. I have a pic of fuel cut at 6400 rpm, but I took the pic a bit late so I'm guessing 6500.

**morepower2** · Oct 6th, 2004, 12:18 PM

Quote:

Originally Posted by Marc Z31

...CUT THE PURPLE WIRE... it tastes like burning.

Turbo cars go 140... unless you cut the wire.
The 84 AE non turbo can go 165, yes 165. It takes forever to get there, but YES 165.

I don't think the NA's can go 165. Where is your proof?

Zen31ZR · Oct 6th, 2004, 01:04 PM

Quote:

Originally Posted by morepower2

I don't think the NA's can go 165. Where is your proof?

Downhill with a tailwind, or if you throw it off a cliff, maybe.

0341TODD · Oct 7th, 2004, 09:21 AM

Good thing I finally hooked my S-AFC and RSM up to the car. Now I can disable the speed limiter with the rsm so I can go 190 mph and I can conveniently add fuel while Im doing so-LOL

I dont know that I will be taking my car past 100 until I do the suspension and make sure the tie rods arent going to break on me......b/c that would suck.