[goldfz8]

Great stuff!!! Max Well ...is your suspension set to the softest setting?

[Max Well]

Originally Posted by goldfz8

Great stuff!!! Max Well ...is your suspension set to the softest setting?

Thanks! I run Sport+ in all settings, but have read some do like to have more suspension sway to put the weight on the rear for better traction. Maybe something I should consider with future runs.

[BrockDM]

Great runs my friend! Nice and consistent too. Definitely use Comfort on the suspension side. You could also try leaving a little earlier in the RPM range. Usually if you are spinning hard you need more grip or less boost/RPM. Being stock tune the Michelins should hold the grip just need to modulate how hard you are pushing it.

It's a learning curve on these cars but can't argue with improvements. GL with the record!

[Max Well]

Originally Posted by BrockDM

Great runs my friend! Nice and consistent too. Definitely use Comfort on the suspension side. You could also try leaving a little earlier in the RPM range. Usually if you are spinning hard you need more grip or less boost/RPM. Being stock tune the Michelins should hold the grip just need to modulate how hard you are pushing it.

It's a learning curve on these cars but can't argue with improvements. GL with the record!

Thanks, BrockDM! I purchased an image from the Track Photographer which he captured about 5 feet after I launched. You can still see the green light, the beam holes and the five skips the tires have made. They're probably just now starting to plant although I usually feel loss of traction even into 2nd on many runs.

Always enjoy my time out there regardless of the ETs but passing a previous personal best is icing on the cake.

[goldfz8]

Great shot!!!! try the soft suspension...for launching its a must. I tried stiff and launched like crap.

[Max Well]

Originally Posted by goldfz8

Great shot!!!! try the soft suspension...for launching its a must. I tried stiff and launched like crap.

Thanks, and I'll try it out next time.

Shared another image from Saturday in the Random Photos thread: https://x3.xbimmers.com/forums/showp...postcount=1151

[NLYFANSX3M]

Need some more low 10 second x3m's on here! I have to wait for the track to open, but i currently sitting at 10.32 1/4 mile on dragy,

[FredLZ]

Hi. Attached my best time for 1/4mile.
I have a doubt (X4M C), thank you if anyone can help me.
My car have coding, rwd activated.

To better my time for 1/4 and 1/2mile, could i follow this steps?
First i clear the tires with the rwd.
And then i launch 4wd sport.
After ~100km/h i change to rwd again to increase the end speed.
What you think about?
There is risk to change at rolling?
tks

[Max Well]

Originally Posted by FredLZ

Hi. Attached my best time for 1/4mile.
I have a doubt (X4M C), thank you if anyone can help me.
My car have coding, rwd activated.

To better my time for 1/4 and 1/2mile, could i follow this steps?
First i clear the tires with the rwd.
And then i launch 4wd sport.
After ~100km/h i change to rwd again to increase the end speed.
What you think about?
There is risk to change at rolling?
tks

Welcome to the Forum, FredLZ, and appreciate you sharing your solid Dragy run.

Although I don't have a background in Automotive Engineering (so take what I say with a grain of salt), I'm not entirely sure I understand how changing to just RWD above 62mph will allow 'an increase in the end speed'? All four wheels are pulling and improving acceleration by that speed so what is to gain by dropping back to RWD only in the upper range, even if you could without damaging components?

And again, even though I have no direct knowledge of whether making that change under full power (esp with a solid tune) would cause damage, my gut feeling is that it would certainly seem to significantly heighten the risk of component failure to abruptly go from AWD to RWD under maximum performance stress. Just my $0.02 - maybe others can chime in.

[Oldgixxer]

Originally Posted by Max Well

Although I don't have a background in Automotive Engineering (so take what I say with a grain of salt), I'm not entirely sure I understand how changing to just RWD above 62mph will allow 'an increase in the end speed'?

Just guessing here,but he may possibly be thinking switching from AWD to RWD after the launch will reduce any drive-train power loss and result in a quicker ET and more MPH? Again,just guessing

[Max Well]

Originally Posted by Oldgixxer

Just guessing here,but he may possibly be thinking switching from AWD to RWD after the launch will reduce any drive-train power loss and result in a quicker ET and more MPH? Again,just guessing

Could be what he was referring to, and maybe he'll reply to our thoughts.

But knowing how hard the fronts pull during full bore LC for the 1/4, one would have to subtract the acceleration advantages they are providing. So weighing possible gain from using just RWD by diminishing theoretical AWD power loss vs. the loss of pull from the AWD - above my pay grade to sort that one out.

But personally, no way I'd try to pull that transition during the max power band even in my bone stock setup, much less a tune running in the low 10's.

[Oldgixxer]

Originally Posted by Max Well

Could be what he was referring to, and maybe he'll reply to our thoughts.

But knowing how hard the fronts pull during full bore LC for the 1/4, one would have to subtract the acceleration advantages they are providing. So weighing possible gain from using just RWD by diminishing theoretical AWD power loss vs. the loss of pull from the AWD - above my pay grade to sort that one out.

But personally, no way I'd try to pull that transition during the max power band even in my bone stock setup, much less a tune running in the low 10's.

Agree with everything ya said

[FredLZ]

Originally Posted by Max Well

Could be what he was referring to, and maybe he'll reply to our thoughts.

But knowing how hard the fronts pull during full bore LC for the 1/4, one would have to subtract the acceleration advantages they are providing. So weighing possible gain from using just RWD by diminishing theoretical AWD power loss vs. the loss of pull from the AWD - above my pay grade to sort that one out.

But personally, no way I'd try to pull that transition during the max power band even in my bone stock setup, much less a tune running in the low 10's.

Correct, my idea would be to reduce the loss per awd, but for transfer case safety I won't test this.
If you want to follow my car on instagram: @bmwx4mcompetition.bnu

[Max Well]

Originally Posted by FredLZ

Correct, my idea would be to reduce the loss per awd, but for transfer case safety I won't test this.
If you want to follow my car on instagram: @bmwx4mcompetition.bnu

Are formal 1/4 mile drag strips present in Brazil?

[FredLZ]

Originally Posted by Max Well

Are formal 1/4 mile drag strips present in Brazil?

We have 1/8, 1/4, 1/2, 1 and 2 miles.
But most common is 1/8.
My best 1/4 was 10,21 and 1/8 6,59s.

[Max Well]

Originally Posted by FredLZ

We have 1/8, 1/4, 1/2, 1 and 2 miles.
But most common is 1/8.
My best 1/4 was 10,21 and 1/8 6,59s.

If you can share formal slips from your track I'll add you to the spreadsheets.

[FredLZ]

Originally Posted by Max Well

If you can share formal slips from a sanctioned track I'll add you to the spreadsheets.

I tested it on the road with dragy. (Sorry i dont speak well english and maybe didnt understand you).
In 18th march im going to an 1/2 event.

[NLYFANSX3M]

2020 X3M Non Comp
AB Performance E50/55 Tune, 29.5PSI roughly
RK Downpipes
BMS Intakes
Valvetronics exhaust
21 Inch BC forged RZ05 wheels-- 265/295 Michelin PS4s
Spare removed, Pass seat removed, rear seats removed. 3/4 tank of gas- OEM sunroof.
4365LBS without Driver, 4600 LBS with driver.

Couldn't hook up to get a low ET, but best on street dragy is 10.24@134.21 - Dragy 0-60 was 2.65sec

This is the 2 passes from today.

10.37@134.75. - Dragy 0-60 was 2.74 sec
10.41@134.59 - Dragy 0-60 was 2.89 sec

[PNTDG42]

Originally Posted by NLYFANSX3M

2020 X3M Non Comp
AB Performance E50/55 Tune, 29.5PSI roughly
RK Downpipes
BMS Intakes
Valvetronics exhaust
21 Inch BC forged RZ05 wheels— 265/295 Michelin PS4s
Spare removed, Pass seat removed, rear seats removed. 3/4 tank of gas- OEM sunroof.
3465LBS without Driver, 3600 LBS with driver.

Couldn't hook up to get a low ET, but best on street dragy is 10.24@134.21 - Dragy 0-60 was 2.65sec

This is the 2 passes from today.

10.37@134.75. - Dragy 0-60 was 2.74 sec
10.41@134.59 - Dragy 0-60 was 2.89 sec

Awesome numbers. But I feel like your weight numbers can’t be accurate? Wouldn’t that equate to over 1000# of weight reduction just from removing the seats?

[Max Well]

Originally Posted by NLYFANSX3M

2020 X3M Non Comp...

This is the 2 passes from today.

10.37@134.75. - Dragy 0-60 was 2.74 sec
10.41@134.59 - Dragy 0-60 was 2.89 sec

Excellent results, NLYFANSX3M - you're now the fastest formal run on the Forum taking over BrockDM's top spot.

I'm attaching your preliminary worksheet to show the data I need to complete your entries. Images of your full slips rather than the partials you shared will allow me to fill in most of the blanks (Strip location and date/time confirmation and second run Rnd #, and then I can look up the weather details and calculate the DAs for each run). Just need to also know your tire psi.

Once I have all the blanks filled in I'll prepare your final version and will also add you to the St2 and Overall Leaderboard spreadsheets.

Also, your BC Forged RZ05 with the 265/295 PS4S is a new wheel/tire combination for the Members' list, so if you get a chance and can share an image or two and the RZ05 specs (are they OEM size or did you go larger?) in that thread I can add you to the list. https://x3.xbimmers.com/forums/showthread.php?t=1949903

[Oldgixxer]

1000lb weight reduction from aftermarket wheels,removing spare,and the seats? Those are some heavy seats,how many people did it take to lift and remove em from the vehicle lol???

[BrockDM]

Originally Posted by Max Well

Excellent results, NLYFANSX3M - you're now the fastest formal run on the Forum taking over BrockDM's top spot.

I'm attaching your preliminary worksheet to show the data I need to complete your entries. Images of your full slips rather than the partials you shared will allow me to fill in most of the blanks (Strip location and date/time confirmation and second run Rnd #, and then I can look up the weather details and calculate the DAs for each run). Just need to also know your tire psi.

Once I have all the blanks filled in I'll prepare your final version and will also add you to the St2 and Overall Leaderboard spreadsheets.

Also, your BC Forged RZ05 with the 265/295 PS4S is a new wheel/tire combination for the Members' list, so if you get a chance and can share an image or two and the RZ05 specs (are they OEM size or did you go larger?) in that thread I can add you to the list. https://x3.xbimmers.com/forums/showthread.php?t=1949903

Welp looks like I need to get back to work and the track haha!

Awesome times by Garrett, his car absolutely rips!

A few things:
- He runs the same exact BC specs that I did so 21x9.5 et17 and 21x11 et35
- I think he transposed the first two numbers by accident when sharing the info. I'm pretty sure he meant 4365.