Installing a Derestrictor

Sep 7, 2009 Random

The last two times I went to the Texas Mile I ran an IVAN’S T.R.E. (Timing Retard Eliminator). Suzuki uses a signal from the G.P.S. (Gear Position Sensor) to tell the ECU the Bike is in 6th gear. The ECU then retards the timing to prevent the bike from running above 186MPH. The T.R.E. Tells the ECU that the Bike is in 5th gear all of the time allowing it to pull as far as the engine has power to pull. The problem is this equals a rough idle in neutral and less than optimal mapping because the ECU is running the 5th gear map in all gears.

So after some research We have decided to run the Boost By Smith De-Restrictor. The De-Restrictor tells the ECU the correct values in every gear until 6th which it then tells the ECU is still 5th. Eliminating the top speed restriction without the shortfalls of a T.R.E.. Also the price is considerably cheaper about $30 US. The De-Restrictor comes in two Models one for Suzuki’s with a gear position read out on the Dash and those without a gear indicator. If you have a bike with a gear indicator the De-Restrictor with a switch on it is the one you want. This allows you to turn it on or off which makes the Gear Position readout on the Dash read normally and leaves the speed restriction in place until the switch position is changed.

This is our friend Hugo he is headed to the Texas Mile Land Speed Races with us. I ran his stock 08 Busa in March to a best of 182MPH. So hopefully with the DeRestrictor it will run bigger numbers. Hugo offered to use his Bike for the Install pics so here we go.

Hugo and the De-Restrictor, compared to the business card you can see it’s pretty small overall just some plugs and wire and a switch all in abrasion resistant sleeve.

Off with the seat and then up with the yank (if you need more detailed instructions on this get help! You need it).

Once the tank is up this is what your going to see on the left side of the bike (most Suzuki’s are going to be the same as the Busa) there are two white plugs under here with 3 wires each.

Now here’s the trick, one of these plugs goes to the Fuel pump/Fuel Tank, The other one goes down to the G.P.S. so you want to unplug the one that DOES NOT go to the Fuel tank! Now just plug the De-Restrictor into the two sides of the plug you just undid.

Pretty simple so far right? Should look like this.

At this point a good test to make sure the De-Restrictor is plugged in correctly is to turn the bike on and shift it through the gears(you may have to rock it back and forth to get it to shift) OR you can have a buddy help you pull the clutch in start the bike and shift it through the gears.

If you have plugged it into the correct plug your gear indicator will show 1st, 2nd, 3rd, 4th, 5th and then when you shift into 6th it will display 6th for about 1 second then the display will read 5th! IF it displays 6th gear and doesn’t change back to 5th try flipping the switch.

Just like that your Bike is now De-Restrcted. The next and final step is deciding where to mount the switch. When we did Terry’s Busa we drilled a small hole up near the front of the inner fairings out of sight. Hugo chose to go a little more stealth by placing it in the trunk.

So just like that you just eliminated the top speed restriction on your Suzuki.

Now for the disclaimer:
This is probably illegal, immoral, unethical, environmentally irresponsible and should only be performed on racing machines which will never see use on public roads. Furthermore is you do this install and ride your bike at it’s max speed it’s not my fault if you crash, explode, become addicted to speed or blast a hole into the time space continuum resulting in the end of Mankind.

Happy riding!