Jump to content
SAU Community

Recommended Posts

Hi All

After a hand our lemon 24 hour car is now hitting the speed limiter (first time its gone 190kmph!) at Sandown at the SAU track day on the weekend. 

Car is a 2003 250GT and has the horrid VQ25DD engine, it is running the 6 speed conversion but we are hitting the limiter down the straights now. 

 

We are planning on running the lemons at the Bend so we need it gone. 

Need to know what wires to snip! dont care about speedo working but need to keep the ABS on as we use it for mates to come and have a go at track time so we have amateurs behind the wheel. 

 

 

DSC_0031.JPG

https://www.facebook.com/anotherdrunkidearacing 

Show me a tunner that can do this then! 

Not as simple as that it’s a vq25dd I can’t find anything on remaps or rom edits for this ecu. Can’t even find a ecu pinout......

They don’t hence why I asked does anyone know what wires to snip? Or does anyone have a 250gt vq25dd ecu pin out? 

Cant find anything online regarding vq25dd ecu pin out so any help is appreciated. And yes they are totally different across all the vq models. 

There's a guy who's cracked the vq25det m35 stagea ecu. Google ITS rom. I know he advertises on ebay, Facebook and is a member on SAU. Cant remember his user name but if you can track him down, would be worth asking him the question and seeing if there's anything he can do for you. Removing a speed limiter should be childs play for him if he can communicate with your ecu.

  • 3 months later...

Hi all just an update on removing the speed limiter.

after no help and no options as speed cut defenders rely on an ecu pin out and they just don’t exist for the v35 vq25 and totally different to other vq25 models.

figured let’s start with abs as that’s how it get is speed signal off the wheel sensors. 

First I pulled the abs fuses but speedo still worked, then unplugged the abs ecu still have speedo. Then unplugged the abs motor and the speedo stopped.

pulled the loom back and found that only 5 wires it could be as 2 are power, 2 are negative and then 4 pairs of wires twisted so I assumed they where going to the wheel sensors. So I was left with 5 wires that it could be.

1B28A293-D939-4FA3-855C-34D22F354C69.thumb.jpeg.e43b8e63c4dbac18a6e8b3a6837639d4.jpeg

 

Started by by cutting the blue one but wasn’t it.

then cut the red/yellow and it was the one! Abs still works but speedo and speed limiter gone! 

6CABB011-0E94-49DA-9618-B8C93AB8DC04.thumb.jpeg.6b122b8d5d7b2711b720637d26fbd171.jpeg

connected they up to a switch on the dash for now so I can switch it on and off, when I have more time I will work out the signal/voltage range and put in and voltage/signal hold at 180. 

  • Like 2

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yep, the closest base tune available was for the GTT, I went with that and made all the logical changes I could find to convert it to Naturally Aspirated. It will rev fine in Neutral to redline but it will be cutting nearly 50% fuel the whole way.  If I let it tune the fuel map to start with that much less fuel it wont run right and has a hard time applying corrections.  These 50% cuts are with a fuel map already about half of what the GTT tune had.  I was having a whole lot of bogging when applying any throttle but seem to have fixed that for no load situations with very aggressive transient throttle settings. I made the corrections to my injectors with data I found for them online, FBCJC100 flowing 306cc.  I'll have to look to see if I can find the Cam section. I have the Bosch 4.9 from Haltech. My manifold pressure when watching it live is always in -5.9 psi/inHg
    • Hi My Tokico BM50 Brake master cylinder has a leak from the hole between the two outlets (M10x1) for brake pipes, I have attached a photo. Can anyone tell me what that hole is and what has failed to allow brake fluid to escape from it, I have looked on line and asked questions on UK forums but can not find the answer, if anyone can enlighten me I would be most grateful.
    • It will be a software setting. I don't believe many on here ever used AEM. And they're now a discontinued product,that's really hard to find any easy answers on. If it were Link or Haltech, someone would be able to just send you a ECU file though.
    • Yes sir am asking is there possible way from aem tuner from wiring pins 
    • Have you checked cam to crank timing and confirmed balancer marks are correct?
×
×
  • Create New...