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      07-08-2019, 12:09 AM   #2776
2007BMW335i
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Drives: 2007 335i
Join Date: Apr 2016
Location: Lowell, AR

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Quote:
Originally Posted by gprnick View Post
But when you set that torque limit in 1st for the launch control for the 6 speed, does it always keep that torque limit?

Or only when you brake boost and after that it goes back to normal for 1st gear?
In the app it says that it restricts maximum torque during brake boosting and through 1st gear. I assume those are different torque values because you will not build enough boost while brake boosting to approach the 350 ft/lbs they recommend as a starting point for a rear wheel drive car. S-Mode or Manual Mode for optimal results. Also I would assume you want to turn dsc/traction control all the way off but hopefully RBT-Tuning can offer more information. Until then this is as much as your going to find out without testing it yourself as every car/road/situation will be different. I have not tested it myself as I use a custom tune I made myself and I limit 1st and second gear power through my load requests which limit requested torque and boost.

This tune is a work in progress, My load values (guessing, need to do more data logs and put them on datazap) should be around 12 psi at the 150 load area 1st gear,16-17 psi in second and 20-21 3rd-6th

https://datazap.me/u/scottxp800/log-...ata=3-13-18-22

This ^^^^^ is a log of a 1800 rpm brake boost launch in 1st. 0 boost until 2000 rpm, about 5 psi at 3000 rpm. 13 pounds of boost with 155 load request (4800-5200 rpm), it spun a little too much so I lowered load request to 150. 2nd gear made about 17.5 psi with 175 load request, spun in 2nd too so I lowered it to 170. My waste gates are worn out so good stock turbos might spool up faster.
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Last edited by 2007BMW335i; 07-08-2019 at 12:14 AM..
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