XHP Flashtool - F8X DCT Transmission Tuning Software Tested!

[Motown65]

Originally Posted by CedricB

Have you used the latest release? Apart from the look and feel, there is no new features that is working: read adaptations doesn’t work, wt least for me. Rest is working just as before. No new maps.

it was just an update for the interface nothing actually performance based. Also read adaptations currently wasnt available for the dct but in this update it is so im not sure what itd read

[BajanDCT]

Just updated to V1.5 (released 6/6/2023) and so far so good - have not tested the new burnout mode yet

Played around with TQ reduction and can say I like more reduction than less. At TQ reduction 500 NM (2/3 of my estimated WTQ) the shifts felt very spongey and slow. I did notice less power loss between shifts, but the shifts were not engaging. Increasing to TQ reduction 600 fixed a lot of issues for me. Wondering if anyone had a similar experience as most seem to be lowering TQ reduction and liking it....

[ALCOBENDAS]

i test the new feature and not work for me.. xhp tell me touch a bit only the brake not full press.. but i cant time to check

Now reduce 300 to 250 tq and i think worse.. a lot hard

[CedricB]

Originally Posted by BajanDCT

Just updated to V1.5 (released 6/6/2023) and so far so good - have not tested the new burnout mode yet

Played around with TQ reduction and can say I like more reduction than less. At TQ reduction 500 NM (2/3 of my estimated WTQ) the shifts felt very spongey and slow. I did notice less power loss between shifts, but the shifts were not engaging. Increasing to TQ reduction 600 fixed a lot of issues for me. Wondering if anyone had a similar experience as most seem to be lowering TQ reduction and liking it....

Maybe provide more details on your car model/setup, also which mode you are shifting with.
I have an M4 comp 2020. Stage 3 V1.5 TR450/TP2, using manual shifts on S3, MDM mode on. Not too bad, but would still like a bit more “engine cut” during upshift. (PS: just updated to TR500 —> better)

[Motown65]

Originally Posted by BajanDCT

Just updated to V1.5 (released 6/6/2023) and so far so good - have not tested the new burnout mode yet

Played around with TQ reduction and can say I like more reduction than less. At TQ reduction 500 NM (2/3 of my estimated WTQ) the shifts felt very spongey and slow. I did notice less power loss between shifts, but the shifts were not engaging. Increasing to TQ reduction 600 fixed a lot of issues for me. Wondering if anyone had a similar experience as most seem to be lowering TQ reduction and liking it....

It’s more so about your reported torque before the shift. Also make sure to compare number with the same units. Torque punch gets adjusted with reduction. Try anywhere from 250/2 to 450/4. M4 gts uses 250/4

[CedricB]

Originally Posted by Motown65

It’s more so about your reported torque before the shift. Also make sure to compare number with the same units. Torque punch gets adjusted with reduction. Try anywhere from 250/2 to 450/4. M4 gts uses 250/4

How do you measure “reported torque before the shift” ? What tool?

[Motown65]

Originally Posted by CedricB

How do you measure “reported torque before the shift” ? What tool?

It’s in your engine log. Something like torque actual at clutch. You just look at the value it is before the shift. You shouldn’t request more torque reduction than that. The 1-2 shift will have the lowest amount so technically no more than what’s on that one. I don’t believe we should aim for the 2/3 target. I think it’s just gonna get you in the ballpark.

[BajanDCT]

Originally Posted by CedricB

Maybe provide more details on your car model/setup, also which mode you are shifting with.
I have an M4 comp 2020. Stage 3 V1.5 TR450/TP2, using manual shifts on S3, MDM mode on. Not too bad, but would still like a bit more “engine cut” during upshift. (PS: just updated to TR500 —> better)

Running BM3 Stage 2 93 on catless DPs & air filters with all GTS coding. My shifts are on XHP Stage 3 in S3 mode with traction off. The car sounds and shifts better with higher TQ reduction for me. I felt like lower TQ reduction (anything below 550) was a spongy shift.

[Motown65]

Originally Posted by BajanDCT

Running BM3 Stage 2 93 on catless DPs & air filters with all GTS coding. My shifts are on XHP Stage 3 in S3 mode with traction off. The car sounds and shifts better with higher TQ reduction for me. I felt like lower TQ reduction (anything below 550) was a spongy shift.

do you have a log of a 3rd or 4th gear pull or eve a dig? what torque punch are you using?

[CedricB]

Originally Posted by Motown65

It’s in your engine log. Something like torque actual at clutch. You just look at the value it is before the shift. You shouldn’t request more torque reduction than that. The 1-2 shift will have the lowest amount so technically no more than what’s on that one. I don’t believe we should aim for the 2/3 target. I think it’s just gonna get you in the ballpark.

Thanks, that’s helpful.
I used MHD datalog. Lower value result is 630 for 3–>4, and 694 max on 5th gear. Which TR value would you recommend?

[CedricB]

Graph

[theweebabySeamus]

Haven't found an answer, does XHP change the reqs to engage LC? IE, get rid of reduce the temp requirement, drive time requirement, etc?

[Motown65]

Originally Posted by theweebabySeamus

Haven't found an answer, does XHP change the reqs to engage LC? IE, get rid of reduce the temp requirement, drive time requirement, etc?

Yes. Look in the different version notes. You still neeed to meet some temp settings so you don’t launch cold but the restart stuff is deleted or so.

[Motown65]

Originally Posted by CedricB

Graph

So this all is just me trial and erroring for a year or so but I’d go with the 630nm. Those dips is your car basically acting like a manual with a clutch and losing power on shifts. I’d say at max 400 reduction.

[ALCOBENDAS]

Yes, now can do LC all the time.. if temps are ok

i test and work

[RobEvans]

Just wanted to drop in and say thanks to everyone involved in this thread. After many data logs and reviewing this thread I found through a Google search, I finally have my XHP dialed in for minimum traction control intervention between shifts at 300nm and TP2 at my stage 2 setup. (750nm peak and 600nm at 6500rpm)

I feel the XHP app is misleading with default starting at 500nm and 5TP, I think it should be lower by default for people to increase as needed.

Also I think to get a true feel for a gear change DSC needs to be off as leaving traction control on can intervene and mislead you into thinking the shift is soft/slow.

Well that's my contribution. Thanks again everyone ����

[Motown65]

Originally Posted by RobEvans

Just wanted to drop in and say thanks to everyone involved in this thread. After many data logs and reviewing this thread I found through a Google search, I finally have my XHP dialed in for minimum traction control intervention between shifts at 300nm and TP2 at my stage 2 setup. (750nm peak and 600nm at 6500rpm)

I feel the XHP app is misleading with default starting at 500nm and 5TP, I think it should be lower by default for people to increase as needed.

Also I think to get a true feel for a gear change DSC needs to be off as leaving traction control on can intervene and mislead you into thinking the shift is soft/slow.

Well that's my contribution. Thanks again everyone ����

I agree with all of this

[BajanDCT]

Originally Posted by Motown65

do you have a log of a 3rd or 4th gear pull or eve a dig? what torque punch are you using?

No, I do not have that. Can BM3 or XHP measure that?

Am assuming my XHP TQ Reduction should be less than TQ at clutch (maybe start at 2/3 and tinker from there). The shifts feel better with more reduction so am wondering why BMW uses 250 TQ Reduction on the M4 GTS. Also, XHP says lower reduction is worse for the clutch... Maybe it's all in my head but it just feels more connected and engaging when I increased from 450 to 600.

[Motown65]

Originally Posted by BajanDCT

No, I do not have that. Can BM3 or XHP measure that?

Am assuming my XHP TQ Reduction should be less than TQ at clutch (maybe start at 2/3 and tinker from there). The shifts feel better with more reduction so am wondering why BMW uses 250 TQ Reduction on the M4 GTS. Also, XHP says lower reduction is worse for the clutch... Maybe it's all in my head but it just feels more connected and engaging when I increased from 450 to 600.

Technically lower reduction can increase the wear in the clutches but I believe as long as the shift is smooth it’s not really doing anything more. Try it with lower. I can tell you if the shift executed correctly the less there is the faster the car will be. The zf autos have drag mode in xHP and that removes all torque reduction but the torque converter can take up some of the shock. Basically just make sure the shift is crisp and smooth. If it feels like someone is kicking the back of the car the shift isn’t balanced

[RobEvans]

Correct me if my maths is totally incorrect this is just a thought.

So considering the GTS map is 250 torque reduction. A GTS engine would theoretically make 500bhp at 6500rpm is 404lbft (548nm)

That puts the ratio that BMW used around x0.46 (548nm x0.46 = 252TR)

So my car has 600nm at 6500rpm when I change gear so using that x0.46 ratio that gives me a TR of 276nm.

Ironic I found the best feeling shifts at 300TR 2TP but even then there is alittle too much kick on occasion. So I might try 250TR again.

To clarify I am searching for the fastest most seamless shift possible as to not upset the car when changing gear, not your typical DCT punch most enjoy.

I still believe XHP default settings should be 250TR and 2TP then people move up from there. That would be my recommendation anyway.

[Motown65]

Originally Posted by RobEvans

Correct me if my maths is totally incorrect this is just a thought.

So considering the GTS map is 250 torque reduction. A GTS engine would theoretically make 500bhp at 6500rpm is 404lbft (548nm)

That puts the ratio that BMW used around x0.46 (548nm x0.46 = 252TR)

So my car has 600nm at 6500rpm when I change gear so using that x0.46 ratio that gives me a TR of 276nm.

Ironic I found the best feeling shifts at 300TR 2TP but even then there is alittle too much kick on occasion. So I might try 250TR again.

To clarify I am searching for the fastest most seamless shift possible as to not upset the car when changing gear, not your typical DCT punch most enjoy.

I still believe XHP default settings should be 250TR and 2TP then people move up from there. That would be my recommendation anyway.

So i feel the issue is do you go for the same ratio like you just explained or should we sjhoot for only 300nm on the shift? like if you made 1000nm at 6500 should you have 700 reduction to get it to the facory 300nm on shift? also the other issue is to have this 1000nm you need big turbos. when launching the car they wont make much power at all in first gear so when the 1-2 shift comes maybe you only have 500nm and if you ask for 700 reduction the engine will castrate itself to meet demand. Ive been ging off engine logs to see how the engine reacts to the dcts demands.

if youre still feeling that kick drop tp to 1.

also if anyone wants to get in on a group to test launch control setting pm me your facebook, whatsapp or another forum of quick communication

[RobEvans]

Originally Posted by Motown65

So i feel the issue is do you go for the same ratio like you just explained or should we sjhoot for only 300nm on the shift? like if you made 1000nm at 6500 should you have 700 reduction to get it to the facory 300nm on shift? also the other issue is to have this 1000nm you need big turbos. when launching the car they wont make much power at all in first gear so when the 1-2 shift comes maybe you only have 500nm and if you ask for 700 reduction the engine will castrate itself to meet demand. Ive been ging off engine logs to see how the engine reacts to the dcts demands.

if youre still feeling that kick drop tp to 1.

also if anyone wants to get in on a group to test launch control setting pm me your facebook, whatsapp or another forum of quick communication

I would be interested in getting a better 0-60 time. At the moment my XHP settings for launch control is default. I have kickdown launch at 1200rpm.

Via MHD 1st gear is limited to 480nm and 2nd gear is 600nm. I'm getting a 3.85 seconds 0-60mph according to draggy