[adrian_j]

apparently raising the torque reduction in xhp gives faster and crisper shifts, has anybody tried this? im gonna be putting xhp on my car today

[Saif2018]

Originally Posted by adrian_j

apparently raising the torque reduction in xhp gives faster and crisper shifts, has anybody tried this? im gonna be putting xhp on my car today

Yes, there's a shift speed custom setting too, as well as for throttle blips to play around with. Plus you can adjust shiftmap in D/S modes and various other settings, it's definitely worth it.

[iqraceworks]

Originally Posted by adrian_j

apparently raising the torque reduction in xhp gives faster and crisper shifts, has anybody tried this? im gonna be putting xhp on my car today

The way I understand it is that YES, it will give you faster shifts....but the trade off is the "increased torque reduction".....which basically means it's pulling power from the motor between shifts. What's better....faster shifting or less power being pulled between gears?

Experiment with it and let us know how it goes.....I haven't messed with that setting before.

I have increased the "shift speed in M mode" values, which also makes shifts faster/harder.....but doesn't increase torque reduction.

As far as the throttle blips settings...I pretty much turned them down all the way. Nothing worse then slowing down to a stop and having your throttle rev up on its own and jump the car forward when it downshifts......not sure who ever thought that was a good idea. No benefits at all when doing that with an automatic transmission...it's just a gimmick.

[adrian_j]

Originally Posted by iqraceworks

The way I understand it is that YES, it will give you faster shifts....but the trade off is the "increased torque reduction".....which basically means it's pulling power from the motor between shifts. What's better....faster shifting or less power being pulled between gears?

Experiment with it and let us know how it goes.....I haven't messed with that setting before.

I have increased the "shift speed in M mode" values, which also makes shifts faster/harder.....but doesn't increase torque reduction.

As far as the throttle blips settings...I pretty much turned them down all the way. Nothing worse then slowing down to a stop and having your throttle rev up on its own and jump the car forward when it downshifts......not sure who ever thought that was a good idea. No benefits at all when doing that with an automatic transmission...it's just a gimmick.

i installed it today and after the break in tested the manual shifting and wow, i had the torque reduction maxed out and its very uncomfortable but the shifting is not comparable. its very fast and fun, the power dips for what feels like milliseconds definitely like it

[iqraceworks]

"very uncomfortable"......as in super hard/rough? Or something else?

[Saif2018]

Originally Posted by adrian_j

i installed it today and after the break in tested the manual shifting and wow, i had the torque reduction maxed out and its very uncomfortable but the shifting is not comparable. its very fast and fun, the power dips for what feels like milliseconds definitely like it

Maxing out the torque reduction will do that, because its removing a tonne of torque between shifts,

You can set it back to default level or reduce it,

I didn't find it "uncomfortable" even at max setting, at halfway at the moment.

[adrian_j]

Originally Posted by iqraceworks

"very uncomfortable"......as in super hard/rough? Or something else?

its a very hard jerk when you switch gears, it slams into the next gear super fast almost feels like a dct

[Yotaismygame]

I haven't messed with my torq reduction yet. Sounds like I should though. I have the shift speeds all the way up for M-mode. Not overly rough at all. I have blips too up 30% for 3-2, 4-3, then 5-4 16% and 10% for 6-5. I rarely use 1st gear but have it down -8% for that. Like other have said having a hard blip 2-1 is kinda scary.

Anyone try Higher line pressure?

[Saif2018]

Originally Posted by Yotaismygame

I haven't messed with my torq reduction yet. Sounds like I should though. I have the shift speeds all the way up for M-mode. Not overly rough at all. I have blips too up 30% for 3-2, 4-3, then 5-4 16% and 10% for 6-5. I rarely use 1st gear but have it down 8% for that. Like other have said having a hard blip 2-1 is kinda scary.

Anyone try Higher line pressure?

Line pressure bump is there if your clutch is slipping, or your pushing serious amount of torque, otherwise XHP recommend leaving it off.

[iqraceworks]

Originally Posted by Saif2018

Line pressure bump is there if your clutch is slipping, or your pushing serious amount of torque, otherwise XHP recommend leaving it off.

According to the documentation xHP put out.....even with the line pressure boost option ON , the transmission will only boost the line pressure if it senses too much torque and/or clutches that are starting to slip. If none of those conditions are present, the line pressure stays at the standard level.

I just leave mine on........better to have and not need, than need and not have. And since these 6HP21 transmissions are rated at something like 330ft/lbs.......it's easy to exceed that with a mild tune, so more grip on the clutches is never a bad idea.

[ky0u]

Originally Posted by adrian_j

its a very hard jerk when you switch gears, it slams into the next gear super fast almost feels like a dct

This happens to me on some of my 2-3 shifts. Most of the time it's great but sometimes when i'm just puttering around and happen to be in M mode, its really jarring

[iqraceworks]

So the question is if the super hard shifting like that actually makes the car any faster, or if all it does is just wear out transmission and driveline parts.

[Saif2018]

Originally Posted by iqraceworks

According to the documentation xHP put out.....even with the line pressure boost option ON , the transmission will only boost the line pressure if it senses too much torque and/or clutches that are starting to slip. If none of those conditions are present, the line pressure stays at the standard level.

I just leave mine on........better to have and not need, than need and not have. And since these 6HP21 transmissions are rated at something like 330ft/lbs.......it's easy to exceed that with a mild tune, so more grip on the clutches is never a bad idea.

Thanks, I thought I read better too leave it off unless you slipping in 4th gear or something along those lines...

I'll activate it, if that's the case.

What's the 6HP19 rated at?

[iqraceworks]

Originally Posted by Saif2018

Thanks, I thought I read better too leave it off unless you slipping in 4th gear or something along those lines...

I'll activate it, if that's the case.

What's the 6HP19 rated at?

I think the 19 is rated just a little less than the 21......but I think they are both pretty much the same transmission. The 21 is just the "updated" version of the 19. There is a ton of tech documents you can find on google from BMW on all the specs for each one. They are pretty amazing transmissions.....nothing like the GM TH-350's I used to rebuild back in the day.

[Saif2018]

Originally Posted by iqraceworks

I think the 19 is rated just a little less than the 21......but I think they are both pretty much the same transmission. The 21 is just the "updated" version of the 19. There is a ton of tech documents you can find on google from BMW on all the specs for each one. They are pretty amazing transmissions.....nothing like the GM TH-350's I used to rebuild back in the day.

[ky0u]

Originally Posted by Saif2018

Thanks, I thought I read better too leave it off unless you slipping in 4th gear or something along those lines...

I'll activate it, if that's the case.

What's the 6HP19 rated at?

Originally Posted by iqraceworks

I think the 19 is rated just a little less than the 21......but I think they are both pretty much the same transmission. The 21 is just the "updated" version of the 19. There is a ton of tech documents you can find on google from BMW on all the specs for each one. They are pretty amazing transmissions.....nothing like the GM TH-350's I used to rebuild back in the day.

Just a heads up on this, the 6hp19 is different than the 6hp19tu (this is what's in the 335i). The 6hp19tu is the BMW designation for ZF's 6hp21; these are the same trans

[Bimmer_Bro]

Originally Posted by Yotaismygame

I haven't messed with my torq reduction yet. Sounds like I should though. I have the shift speeds all the way up for M-mode. Not overly rough at all. I have blips too up 30% for 3-2, 4-3, then 5-4 16% and 10% for 6-5. I rarely use 1st gear but have it down 8% for that. Like other have said having a hard blip 2-1 is kinda scary.

Anyone try Higher line pressure?

Next time you're experimenting try making the 2>1 blip at -45%. I have mine around there and it's decently smooth. I don't downshift into first very often except coming to my driveway.
It's a slower blip/shift for sure but makes it usable if needed.

[Yotaismygame]

Originally Posted by Bimmer_Bro

Next time you're experimenting try making the 2>1 blip at -45%. I have mine around there and it's decently smooth. I don't downshift into first very often except coming to my driveway.
It's a slower blip/shift for sure but makes it usable if needed.

I rarely use 1st. Only if I'm on a hill stopped. Which then Ill shift to first after I'm stopped so it's not an issue for me. I also only drive in manual. Only way I truly enjoy the car. I had to edit my last post. I meant negative 8%

[iqraceworks]

Originally Posted by ky0u

Just a heads up on this, the 6hp19 is different than the 6hp19tu (this is what's in the 335i). The 6hp19tu is the BMW designation for ZF's 6hp21; these are the same trans

Thanks for the info. I read somewhere that the 19 and 21 in the 335i were the same thing.

[iqraceworks]

.....firing up an old thread. Has anyone been able to dial in some good settings for "TQ reduction up shifts"? If so...could you share them?

I'm still confused at what the setting does.....it says more torque reduction will make the shifts harder, but it kills engine power more during the shifts....isn't that counterproductive?

Less torque reduction doesn't remove as much engine power during the shifts.....so it says the shifts will be slower....but shouldn't the car overall be faster since you are not pulling as much engine power? Is it harder on the transmission if you shift without pulling engine power? Is that pretty much what the drag shift option does?

Why doesn't xHP get rid of the torque reduction settings and incorporate it all under a shift speed setting they they have for the manual mode?

Any info would be great......just trying to understand the TQ reduction settings before I start tinkering around with them.

[Saif2018]

Originally Posted by iqraceworks

.....firing up an old thread. Has anyone been able to dial in some good settings for "TQ reduction up shifts"? If so...could you share them?

I'm still confused at what the setting does.....it says more torque reduction will make the shifts harder, but it kills engine power more during the shifts....isn't that counterproductive?

Less torque reduction doesn't remove as much engine power during the shifts.....so it says the shifts will be slower....but shouldn't the car overall be faster since you are not pulling as much engine power? Is it harder on the transmission if you shift without pulling engine power? Is that pretty much what the drag shift option does?

Why doesn't xHP get rid of the torque reduction settings and incorporate it all under a shift speed setting they they have for the manual mode?

Any info would be great......just trying to understand the TQ reduction settings before I start tinkering around with them.

From my understanding TQ reduction is exactly as you said, pulls torque between shifts, rasing TQ reduction + it's easier on the clutches as a result, faster shifts, but can increase lag between shifts,

Lowering TQ reduction - can reduce lag between shifts, slower shifts and harder on clutches as a result.

We're probably talking very small amounts, I never felt any noticable lag between shifts. Just left it in the middle.