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      06-21-2019, 05:22 PM   #2729
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@RBT-Tuning

I've just seen you added Custom Launch Control for 6 speed Automatic transmission, thats great news!

Could you tell us how exactly it should be used?

Hold down break pedal with left foot and increase gas to desired rpm before letting go of brake or hold down break and then floor gas pedal fully then let go of brake?

Also can brake boosting cause damage to the gearbox, brake booster or any part of the engine?

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Last edited by Saif2018; 06-22-2019 at 01:21 AM..
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      06-23-2019, 01:50 AM   #2730
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Originally Posted by Saif2018 View Post
@RBT-Tuning

I've just seen you added Custom Launch Control for 6 speed Automatic transmission, thats great news!

Could you tell us how exactly it should be used?

Hold down break pedal with left foot and increase gas to desired rpm before letting go of brake or hold down break and then floor gas pedal fully then let go of brake?

Also can brake boosting cause damage to the gearbox, brake booster or any part of the engine?

Regards
Custom launch control (on the 6hp) is limiting torque in the gears you have traction issues with, via customization module. You will have to experiment to see what works best for you. You want a little bit of tire spin but not so much that it goes sideways or just "blows the tires off".

Brake boost (stalling torque converter) will cause fluid temperatures to rise due to the load on the fluid in the torque converter, you will want to minimize the time you brake boost. Won't hurt anything else any more than normal braking and acceleration.

As for how long you hold the brake, how much throttle and when. That too will take experimenting to see what works best with your car and it's modifications, tires, etc... Many people launch in 2nd gear because it's so easy to spin the tires in 1st.

For me I hold the DTC button for 3 seconds to turn off all traction control and DSC. Currently I limit my boost in 1st and 2nd gear with MHD as I have a baseline with boost that I do not yet know how to correlate with how much torque is needed for the same results. Once I get it dialed in where I want it I will try the single push of the DTC button.

Read this? https://www.xhpflashtool.com/blog/la...rol_explained/

RBT Tuning can add or correct anything I missed but it sounds like once you optimize your torque limits the single button push traction control will work as it did on a stock car. Allowing some slip without excess throttle closure.
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      06-23-2019, 07:08 AM   #2731
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Quote:
Originally Posted by 2007BMW335i View Post
Custom launch control (on the 6hp) is limiting torque in the gears you have traction issues with, via customization module. You will have to experiment to see what works best for you. You want a little bit of tire spin but not so much that it goes sideways or just "blows the tires off".

Brake boost (stalling torque converter) will cause fluid temperatures to rise due to the load on the fluid in the torque converter, you will want to minimize the time you brake boost. Won't hurt anything else any more than normal braking and acceleration.

As for how long you hold the brake, how much throttle and when. That too will take experimenting to see what works best with your car and it's modifications, tires, etc... Many people launch in 2nd gear because it's so easy to spin the tires in 1st.

For me I hold the DTC button for 3 seconds to turn off all traction control and DSC. Currently I limit my boost in 1st and 2nd gear with MHD as I have a baseline with boost that I do not yet know how to correlate with how much torque is needed for the same results. Once I get it dialed in where I want it I will try the single push of the DTC button.

Read this? https://www.xhpflashtool.com/blog/la...rol_explained/

RBT Tuning can add or correct anything I missed but it sounds like once you optimize your torque limits the single button push traction control will work as it did on a stock car. Allowing some slip without excess throttle closure.
Thanks, yes I read that, as I never brake boost and the 6 speed zf has no real LC where you for it and it holds revs until you let go of brake, I was wondering if we do the same on zf6 speed.

I'd rather not risk any Damage to Torque converter, so repeated use can potentially cause serious damage?


Regards
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      06-23-2019, 01:54 PM   #2732
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Quote:
Originally Posted by Saif2018 View Post
Thanks, yes I read that, as I never brake boost and the 6 speed zf has no real LC where you for it and it holds revs until you let go of brake, I was wondering if we do the same on zf6 speed.

I'd rather not risk any Damage to Torque converter, so repeated use can potentially cause serious damage?


Regards
It won't really hurt the torque converter, extended brake boosting will heat the fluid which is bad for the fluid and the transmission in general, a few seconds to launch the car won't hurt anything. At the dragstrip I will hold the brake, rev the engine up to about 1600-1800 then release the brake and mash the throttle at the same time.
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      06-23-2019, 01:55 PM   #2733
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If I'm rolling at 20km/h and then floor it in sport, I get double / triple pops when it upshifts from 1st to 2nd. It sounds sort of like a DCT upshift fart. Is it possible for you make a feature where it does this whenever you upshift?
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      06-23-2019, 09:51 PM   #2734
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So whats the verdict power wise- in a roll race 30 mph start or so- would the 29WHP come into play per the Dyno that XHP Did on the stock 335 car?
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      06-24-2019, 09:50 AM   #2735
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Quote:
Originally Posted by 2007BMW335i View Post
It won't really hurt the torque converter, extended brake boosting will heat the fluid which is bad for the fluid and the transmission in general, a few seconds to launch the car won't hurt anything. At the dragstrip I will hold the brake, rev the engine up to about 1600-1800 then release the brake and mash the throttle at the same time.
Thanks mate. I guess I'll have to try it then.

Regards
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      06-24-2019, 10:46 AM   #2736
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Quote:
Originally Posted by 2007BMW335i View Post
It won't really hurt the torque converter, extended brake boosting will heat the fluid which is bad for the fluid and the transmission in general, a few seconds to launch the car won't hurt anything. At the dragstrip I will hold the brake, rev the engine up to about 1600-1800 then release the brake and mash the throttle at the same time.
So your brake boosting in 2nd gear at the strip? I'm worried that load on the TC from a standstill would be very hard on the TC? Especially in 2nd gear? I have mine set for 15psi max in 2nd gear. My tires handle that as long as the road is good. Dumping 15psi from a dead stop in 2nd gear? I'm leary of that so I just do 1st gear which I have set for 10psi max but getting the shift to 2nd ends up being clumsy and timing that is not easy. But I havent done XHP yet but looking at it hard now.
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      06-24-2019, 02:28 PM   #2737
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Quote:
Originally Posted by FIREWORKKS View Post
If I'm rolling at 20km/h and then floor it in sport, I get double / triple pops when it upshifts from 1st to 2nd. It sounds sort of like a DCT upshift fart. Is it possible for you make a feature where it does this whenever you upshift?
I think either I asked before or someone else did. RBT answered it's DME programming related, not transmission related.
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      06-24-2019, 10:31 PM   #2738
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Quote:
Originally Posted by Street of Rage View Post
I think either I asked before or someone else did. RBT answered it's DME programming related, not transmission related.
It makes a really long fart noise when I floor it around a corner, traction control kicks in and then it reaches 2nd gear. Maybe they could trick the DME by making the traction control kicks in on upshifts? Just a random idea lol
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      06-27-2019, 01:08 PM   #2739
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Quote:
Originally Posted by FIREWORKKS View Post
It makes a really long fart noise when I floor it around a corner, traction control kicks in and then it reaches 2nd gear. Maybe they could trick the DME by making the traction control kicks in on upshifts? Just a random idea lol
I believe traction control is initiated by DSC signal to DME, transmission programming can't control that.

I'm experimenting to see if I can make a noise on shift by engaging rev limiter 50 rpm before programmed shift with a 0.1 second interval. This would be a wide open throttle shift only. I'm thinking the rev limiter hit at shift may make some popping noise but I just put in my tune with tuner pro, have not tried it yet. I'm sure it will take some tinkering to hear anything, may not work at all. But this is my custom bin file for the DME (tune) also not an xHP thing. It could also confuse the torque limit on shift in xHP so this could be a total fail.
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      06-29-2019, 10:21 AM   #2740
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I tried to use the custom shift points on my 8 speed, I wanted to lower them in 7th and 8th gear to engage them lower in the rpms than standard. Didn't seem to make any difference when I moved the shift points to -50% (all the way to the left) in 6-7 and also 7-8. Went the other way (all the way to the right) for 6-7 7-8 for downshifts.
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      06-29-2019, 12:44 PM   #2741
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Don't think it's related at all but I sold my buddy my N55 with the ZF6. I had the xhp flash on it when I owned it in conjunction with the JB4. Never had any issues.

He purchased the car from me with stock ECU flash no JB4 or MHD. We flashed the xhp tune and the car kept going into limp mode with coolant warnings on the dash. Stage 3 flash.

Flashed the car back to the stock trans flash and uninstalled xhp and the cars working fine now. Don't see how the TCU and ECU are related in any way but it's an odd coincidence.
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      06-30-2019, 06:37 PM   #2742
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      07-02-2019, 01:55 PM   #2743
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Quote:
Originally Posted by Soden82 View Post
Don't think it's related at all but I sold my buddy my N55 with the ZF6. I had the xhp flash on it when I owned it in conjunction with the JB4. Never had any issues.

He purchased the car from me with stock ECU flash no JB4 or MHD. We flashed the xhp tune and the car kept going into limp mode with coolant warnings on the dash. Stage 3 flash.

Flashed the car back to the stock trans flash and uninstalled xhp and the cars working fine now. Don't see how the TCU and ECU are related in any way but it's an odd coincidence.
You didn't state if you were running Stage 3 when you had the JB4.
JB4 allows water pump control so you can run it longer and higher speed.
Automatic cars have a transmission cooler, tied to the radiator.

There is correlation between the JB4 and coolant temperature and therefore transmission temp. Stage 3 can heat up the fluid depending on what you are doing.

You also don't state how many mies and the condition of the fluid.
I don't have issues with my n54 but I also have the sport package with an oil cooler and an extra capacity radiator.
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      07-03-2019, 02:08 PM   #2744
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Quote:
Originally Posted by HB E90 View Post
So your brake boosting in 2nd gear at the strip? I'm worried that load on the TC from a standstill would be very hard on the TC? Especially in 2nd gear? I have mine set for 15psi max in 2nd gear. My tires handle that as long as the road is good. Dumping 15psi from a dead stop in 2nd gear? I'm leary of that so I just do 1st gear which I have set for 10psi max but getting the shift to 2nd ends up being clumsy and timing that is not easy. But I havent done XHP yet but looking at it hard now.
You won't see any boost until around 2000 rpm (15 psi after 4000), 1500-1600 rpm is what I use. It's very common to use 2nd gear to launch at the strip.
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      07-04-2019, 11:57 PM   #2745
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I've been running stage 3 on my E90 Drive for a few months now. Noticed some jerking so I decided to purchase and install stage 2. When I did that, the car gave me a trans malfunction light. Xhp pulled the following code:

4F811 Gear Ratio Monitoring Clutch

Sssso is my transmission suddenly ruined? With flashing back to stock resolve this code? And, how exactly do I do that?
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      07-05-2019, 11:27 AM   #2746
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Quote:
Originally Posted by Hvyarms View Post
I've been running stage 3 on my E90 Drive for a few months now. Noticed some jerking so I decided to purchase and install stage 2. When I did that, the car gave me a trans malfunction light. Xhp pulled the following code:

4F811 Gear Ratio Monitoring Clutch

Sssso is my transmission suddenly ruined? With flashing back to stock resolve this code? And, how exactly do I do that?
I remember seeing a video on Youtube about that error code. It was a small rubber/plastic seal under the valve body.
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      07-06-2019, 01:28 PM   #2747
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How exactly does the launch control work? Does it keep the torque limited only for the second the car is getting off the line or till traction is made?
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      07-06-2019, 05:49 PM   #2748
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Originally Posted by Chris1337 View Post
How exactly does the launch control work? Does it keep the torque limited only for the second the car is getting off the line or till traction is made?
6 speed or 8 speed?

6 speed I think it only allows you to set a torque limit for first gear. Pick the option in the app, it explains how it works in the settings screen for launch control.

Custom Launch Control 8-Speed: Launch Control is a 2-Step process. It gets activated only in
S/Sport+ or S/Traction mode of your vehicle. Place your car on a safe, level and straight street.
Move your Gear Lever to S and put the car into Traction or Sport+ mode. Now press the brake
VERY hard and quickly apply full throttle with the kickdown switch depressed. On vehicles with
LC from factory you willsee "Launch Control active" on your dash. The amount of boost/torque
your car is allowed to build while the brake is depressed is setup with the "Set Launch Torque"
slider. After releasing the brake the Car tries to manage torque and traction along programmed
presets which can be tuned up and down with the "Torque Scaling After Launch" slider. 0% is
the factory setting and is optimized for stock cars. Tuned cars may need different settings. You
are free to experiment with those settings and find your personal best.
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      07-07-2019, 09:20 AM   #2749
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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?
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      07-07-2019, 12:04 PM   #2750
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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?
Ingot the same question, I just worded it horribly
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