Roland@pcmtec Posted January 20, 2021 Share Posted January 20, 2021 Problem: You have a car that is making 500rwkw and simply cannot get the power to the ground on the street and is even losing to cars with less power on the drag strip due to a peaky and uncontrollable torque curve. Solution: Utilise our boost by gear / boost by speed functionality to torque limit the vehicle in lower gears to allow the car to be as fast as possible. To enable this feature you require the workshop edition and a 5 credit "Standard Custom OS". This is an extra 2 credits on top of a standard license. First open the custom operating system wizard, select "Standard Custom OS" and press Next. You will then see a "Custom OS Options" page. Leave these options standard. Press "Check License and Proceed" which will then ask you to license the file, this will charge you an extra 2 credits (total of 5 for the vehicle). This will only be charged once. You will now see a second set of Custom OS options (these can be changed as many times as you like). Select the "Boost Configuration" dropdown menu and you will be presented with various options. Boost by Gear: For a street car we always recommend "Boost By Gear" for all applications. In the ZF 6 speed auto gears 4/5/6 all use the 4th gear row. This is as the gear calculation code is legacy from the BTR and does not set a gear higher than 4th gear. We have found that in almost all applications you will want full boost by 4th gear anyway, however if you do need to reduce boost 4th gear we recommend using boost by speed instead. In manual vehicles the gear is calculated for gears 1-6. Boost by Speed For a vehicle which is doing 300kph down the drag strip or has a 2/3 speed gear box the boost by speed options may be more appropriate. When choosing boost by speed you can choose a specific wheel or the average of all wheels. We recommend one of the front wheels for a RWD car. For an AWD car either pick "Boost by Speed" which will take the average of all 4 wheels, or pick the wheel with the most traction (usually a rear wheel). Press Next then "Finish" and the file will automatically save and re-open. Now navigate to the Wastegate Duty Cycle for Open Loop table and you will see gear (or speed) as the Y-Axis As you can see the factory values no longer make sense as we are no longer referencing IAT as the Y-Axis. The next step is to set all rows to be the same by copying the row from the most common IAT. Repeat this for the desired boost table as well. Or if you are running open loop boost you can ignore the desired boost table. Next depending on the power the vehicle is making and how much traction you are getting in the lower gears you can try something like this. In this example we have multiplied first gear by 0.25 so that you will be running approximately 25% of full boost in 1st gear. 50% of boost in second gear and 75% in 3rd gear. Once 4th gear hits you will be running full boost. The above setup will allow a vehicle with hard non sticky street tyres to now get traction in all 6 gears on the street. This will make for a faster and far more fun vehicle, not to mention safer for when your partner takes the vehicle for a drive. We recommend combining boost by gear with the MFT (Multi Flash Tune) and setting up the following tunes to maximise the potential of the vehicle. These tunes can be changed with the engine running at any time to allow you to quickly pick the correct profile for the weather/street conditions. Tune 1: Valet / 0% boost (for other family members) Tune 2: Low Boost (wet weather) Tune 3: Boost by Gear (street driving) Tune 4: High Boost (eg drag strip, burnout competitions etc) To achieve low/high boost with boost by gear enabled, simply set all rows to be equal. This will negate the gear/speed part of the calculation. Read more about the MFT here: Quote Link to comment Share on other sites More sharing options...
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