BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   BMW M3 and BMW M4 Forum > BMW F80 M3 / F82 M4 Forum > BMW M4 GTS Discussions

Post Reply
 
Thread Tools Search this Thread
      12-11-2019, 02:02 PM   #23
FormulaMMM
Brigadier General
FormulaMMM's Avatar
United_States
3663
Rep
3,422
Posts

Drives: E90 M3
Join Date: Oct 2011
Location: Midwest

iTrader: (2)

Quote:
Originally Posted by Lienrocs View Post
This has been extensively covered in other forums. Yes, it's not ideal, but has been used as an oe solution by countless manufacturers, including bmw. If having the buckle inside the bolster is your concern then you should cross bucket seats off your list of modifications.
I ended up with the same compromise. No way I could have routed the receptacle through the Profi XL gap.

6 pt fits like a charm though. I'll take my chances with a 6 pt + HANS on track over an imperfect 3 pt to and from the gas station.

Interesting point on the GTS factory seats probably not being suitable for >6' with a 6 pt.
__________________
M4 GTS, GT3, C63 S | E90 M3s, E39 M5

Appreciate 1
SYT_Shadow11421.00
      12-11-2019, 03:12 PM   #24
Lienrocs
Captain
Lienrocs's Avatar
701
Rep
867
Posts

Drives: E92 M3, M4 GTS, HP4
Join Date: May 2017
Location: Austin

iTrader: (3)

Quote:
Originally Posted by FormulaMMM View Post
Quote:
Originally Posted by Lienrocs View Post
This has been extensively covered in other forums. Yes, it's not ideal, but has been used as an oe solution by countless manufacturers, including bmw. If having the buckle inside the bolster is your concern then you should cross bucket seats off your list of modifications.
I ended up with the same compromise. No way I could have routed the receptacle through the Profi XL gap.

6 pt fits like a charm though. I'll take my chances with a 6 pt + HANS on track over an imperfect 3 pt to and from the gas station.

Interesting point on the GTS factory seats probably not being suitable for >6' with a 6 pt.
I'm in the same boat. You're gonna have to make compromises somewhere. I'm locked in right with a six point belt. Fingers crossed street driving nothing major happens but I know what risk I'm taking when I start swapping things out.

There's no way a pp worked for me. Which is a shame because I still think it's the most comfortable seat recaro makes. I had one in an e36 and daily drive it with zero issues. The new recaro whatever they call it they just debuted may solve every problem. It's been designed for road legality and track use.
Appreciate 0
      12-11-2019, 03:23 PM   #25
aBMWfan
Banned
United_States
1193
Rep
3,670
Posts

Drives: 08' M3/'15 M4/ '06 M3/ '09 M3/
Join Date: Feb 2016
Location: Thousand Oaks

iTrader: (11)

Quote:
Originally Posted by FormulaMMM View Post
I ended up with the same compromise. No way I could have routed the receptacle through the Profi XL gap.

6 pt fits like a charm though. I'll take my chances with a 6 pt + HANS on track over an imperfect 3 pt to and from the gas station.

Interesting point on the GTS factory seats probably not being suitable for >6' with a 6 pt.
Damn I’m barely 6’
Appreciate 0
      12-11-2019, 03:57 PM   #26
SYT_Shadow
///M Powered for Life
SYT_Shadow's Avatar
11421
Rep
10,296
Posts

Drives: E90M/E92M/M4GTS/M4GT4/X5M
Join Date: Sep 2010
Location: Greenwich, CT

iTrader: (2)

Cobra also builds a nice seat that allows proper 3 point access

I have Sparco Ergos with removable halos on both track cars. I'll take a halo before good 3 point access. Ideally I'd have both...
Appreciate 1
Lienrocs701.00
      12-11-2019, 06:16 PM   #27
Lienrocs
Captain
Lienrocs's Avatar
701
Rep
867
Posts

Drives: E92 M3, M4 GTS, HP4
Join Date: May 2017
Location: Austin

iTrader: (3)

Quote:
Originally Posted by aBMWfan View Post
Quote:
Originally Posted by FormulaMMM View Post
I ended up with the same compromise. No way I could have routed the receptacle through the Profi XL gap.

6 pt fits like a charm though. I'll take my chances with a 6 pt + HANS on track over an imperfect 3 pt to and from the gas station.

Interesting point on the GTS factory seats probably not being suitable for >6' with a 6 pt.
Damn I’m barely 6’
I wasn't trying to say anything about anyone. We're all just enthusiasts trying to make our cars perfect in our own individual ways. Sorry if it came across like an attack, it was not! I'm merely speaking from my own experience and those of people who have had the same issues as myself regarding pole positions and belt heights.
Appreciate 0
      12-11-2019, 07:05 PM   #28
aBMWfan
Banned
United_States
1193
Rep
3,670
Posts

Drives: 08' M3/'15 M4/ '06 M3/ '09 M3/
Join Date: Feb 2016
Location: Thousand Oaks

iTrader: (11)

Quote:
Originally Posted by Lienrocs View Post
I wasn't trying to say anything about anyone. We're all just enthusiasts trying to make our cars perfect in our own individual ways. Sorry if it came across like an attack, it was not! I'm merely speaking from my own experience and those of people who have had the same issues as myself regarding pole positions and belt heights.
No I get you. I do have shorter friends so it’s good to know. We’re all trying to bounce ideas off eachother. At least on this thread
Appreciate 0
      12-11-2019, 07:17 PM   #29
Lienrocs
Captain
Lienrocs's Avatar
701
Rep
867
Posts

Drives: E92 M3, M4 GTS, HP4
Join Date: May 2017
Location: Austin

iTrader: (3)

Quote:
Originally Posted by aBMWfan View Post
Quote:
Originally Posted by Lienrocs View Post
I wasn't trying to say anything about anyone. We're all just enthusiasts trying to make our cars perfect in our own individual ways. Sorry if it came across like an attack, it was not! I'm merely speaking from my own experience and those of people who have had the same issues as myself regarding pole positions and belt heights.
No I get you. I do have shorter friends so it’s good to know. We’re all trying to bounce ideas off eachother. At least on this thread
Cool cool. It's hard to get inflection in a written message and reading it back I sounded a bit aggressive there! My bad, team GTS!
Appreciate 0
      01-23-2020, 06:00 PM   #30
winjury
Private
United_States
17
Rep
97
Posts

Drives: 2011 e90 n55/ 2012 e70 n63
Join Date: Jun 2019
Location: Orlando.

iTrader: (0)

Quote:
Originally Posted by Gomeler View Post
Finally managed to get a morning of lapping in after ~4 months of ownership, and completely confirmed I made the right decision going with the GTS instead of a M2C. The GTS is an absolute riot on the track.

A few observations:
  • Bring Gas: averaged 6.2MPG, fuel starved after ~57 miles. This was intentional due to the alignment concerns.
  • Get Camber Plates: my front alignment was flawed, -1.4* due to the strut brace limiting the camber plate movement, going back with the explicit instructions to remove the brace during alignment. My home track eats left front tires, and even overbraking by 10-15mph in the high-speed right corners I definitely started chewing up the LF shoulder in ~60 minutes.
  • Bring Water: the water injection tank level alert started chiming before I ran out of gas. Super annoying/distracting when the car chimes at you every corner for your last 2 laps.
  • Turn off DSC: MDM was useful for the first session or two to familiarize myself with the car's behavior and to sort out tire pressures, but I dropped from 2:08.xx to 2:03.xx simply turning off DSC. Max positive toe(~0.13*) helped keep the throttle oversteer in check, but you could happily drift this thing around every corner if you wanted.
  • CCBs pedal feel leaves something to be desired: felt very unpredictable, but that might be a seat-time thing. They sure do stop quick, and zero fade issues. Front tires overheated/spiked in pressure before the brakes.
  • Get harnesses: I hate that USDM GTS' didn't get the European seats. I'm confident I'll drop ~2-3 seconds with a harness. Trail braking is a nightmare sliding in the seat, and several corners I'd struggle mid-corner to start throttling-out because of the lateral Gs.
  • Sport+ throttle is perfect: It is borderline unusable on the street, but it is absolutely perfect for medium/high speed tracks. I was in 3rd -> 5th gear, and the throttle sensitivity was perfect for trying to throttle steer the car a bit towards the end.

On the street the GTS feels kind of like a muscle car, because you can't safely exercise its capabilities in the corners. On the track it is still a bit like a missile trying to straighten out corners to bury the throttle, but it is definitely capable of holding its own with momentum lines through corners. Related, there was a guy flogging an E39 M5, it was awesome watching him sling that boat through the corners and try to put his power down.

My car is now in storage until January due to my home track being closed for winter break. I'll update my post about camber settings once I get out to the track again with a correct alignment + pyrometer + have more than 1 tank of gas.

Obligatory track-day photo. This was after the first session, pulled the front splitter out for sessions 2 and 3.
https://f80.bimmerpost.com/forums/at...8;d=1574108927
I mean that's the reason why you get any M. You can make a 335 faster but not handle better so keep that car on the track.
__________________
2011 e90 n55- fully upgraded fuel and air system. Hellcats dont like me
2012 e70 n63- m package, ESS flash tune, x5m bumper and megan racing quad exhaust
Appreciate 1
      01-23-2020, 06:02 PM   #31
DRLane
Brigadier General
DRLane's Avatar
United_States
3968
Rep
3,390
Posts

Drives: E92 M3
Join Date: Oct 2018
Location: Colorado

iTrader: (21)

Garage List
2008 m3  [6.17]
Looks like HPR? Have you broke 2 mins yet?
__________________
Not a Doctor, those are just my initials.
Appreciate 0
      01-23-2020, 06:18 PM   #32
LemonOne
Major
LemonOne's Avatar
United_States
708
Rep
1,079
Posts

Drives: ///Most Powerful Letter
Join Date: Oct 2009
Location: East Coast

iTrader: (0)

Great track write up!
Appreciate 0
      01-23-2020, 06:52 PM   #33
Gomeler
Lieutenant
500
Rep
411
Posts

Drives: '16 M235iR, '16 M4 GTS
Join Date: Jun 2019
Location: Boulder, CO

iTrader: (0)

Quote:
Originally Posted by DRLane View Post
Looks like HPR? Have you broke 2 mins yet?
It is HPR, and the car has been in storage since the day after that outing. I have a backlog of heavy maintenance against my STI and my e82, once that is wrapped up then I'm plunking my bucket seats in the GTS and heading out to HPR again. Seats + harnesses alone will get me really close to 2:00, if not under it. Fresh rubber will also help a lot I suspect, my tires have 2016 date codes
Appreciate 1
DRLane3968.00
      01-23-2020, 07:28 PM   #34
cncmastr
Colonel
cncmastr's Avatar
United_States
1569
Rep
2,401
Posts

Drives: E46 ZCP, F85, E70, G07
Join Date: Mar 2006
Location: Outside Atlanta

iTrader: (3)

Garage List
2018 X5 M  [0.00]
2020 M2 CS  [0.00]
2005 BMW X5 4.8is  [0.00]
2006 BMW M3  [0.00]
I would love to have seen a video of the E 39 andfive tearing it up on the track.
Thanks for your comments and review about your car, sounds like fun.
__________________
Appreciate 0
      01-23-2020, 07:48 PM   #35
DRLane
Brigadier General
DRLane's Avatar
United_States
3968
Rep
3,390
Posts

Drives: E92 M3
Join Date: Oct 2018
Location: Colorado

iTrader: (21)

Garage List
2008 m3  [6.17]
Quote:
Originally Posted by Gomeler View Post
Quote:
Originally Posted by DRLane View Post
Looks like HPR? Have you broke 2 mins yet?
It is HPR, and the car has been in storage since the day after that outing. I have a backlog of heavy maintenance against my STI and my e82, once that is wrapped up then I'm plunking my bucket seats in the GTS and heading out to HPR again. Seats + harnesses alone will get me really close to 2:00, if not under it. Fresh rubber will also help a lot I suspect, my tires have 2016 date codes
Awesome man! hopefully I'll see ya out there sometime as I'm also hoping to break 2 this year, just figured the GTS would easily post low 1:50s.
__________________
Not a Doctor, those are just my initials.
Appreciate 0
      01-23-2020, 09:05 PM   #36
Savory
Kaskasero
Savory's Avatar
54
Rep
345
Posts

Drives: You Insane
Join Date: Sep 2013
Location: Azusa, Ca

iTrader: (0)

Did you experiment with the damper adjustments? Every review I've read says the GTS is overly stiff over bumps, but I heard a few clicks softer on the high speed compression would make it more stable
__________________
Rides:
BSM E53 X5 3.0i | Mods: 4.8is Style 168 wheels
1996 MB C280 Sport
2001 E39 M5
Appreciate 0
      01-24-2020, 03:05 AM   #37
N & M
Captain
371
Rep
769
Posts

Drives: F90 M5
Join Date: Jul 2012
Location: The Gulf

iTrader: (0)

What it was meant to do!

Glad that you are doing with the car what the engineers intended it to do in the first place. Enjoy and be safe.
Appreciate 0
      01-24-2020, 10:36 AM   #38
COChris
Captain
COChris's Avatar
No_Country
888
Rep
739
Posts

Drives: M2C
Join Date: Feb 2015
Location: West

iTrader: (1)

I recognize that track! Great to see the GTS out romping around at HPR.

You should be able to break the 2:00 mark easily with more tweaks. Fastest so far in the M2C is 2:03.5, albeit with a very talented driver behind the wheel (not me!).
Appreciate 0
      01-24-2020, 10:52 AM   #39
Gomeler
Lieutenant
500
Rep
411
Posts

Drives: '16 M235iR, '16 M4 GTS
Join Date: Jun 2019
Location: Boulder, CO

iTrader: (0)

Quote:
Originally Posted by Savory View Post
Did you experiment with the damper adjustments? Every review I've read says the GTS is overly stiff over bumps, but I heard a few clicks softer on the high speed compression would make it more stable
Not yet, I had ~4 laps at pace with DSC off before I fuel starved. I spent too much time familiarizing myself with the car + trying to make MDM work. Hopefully the next outing I'll have 50+ laps at pace, and plenty of time to experiment.

Quote:
Originally Posted by COChris View Post
I recognize that track! Great to see the GTS out romping around at HPR.

You should be able to break the 2:00 mark easily with more tweaks. Fastest so far in the M2C is 2:03.5, albeit with a very talented driver behind the wheel (not me!).
Yeah, 2:00 should be cake, I think 1:55 or so will be the lower limit. I love HPR, just wish it had slightly better facilities

Quote:
Originally Posted by cncmastr View Post
I would love to have seen a video of the E 39 andfive tearing it up on the track.
Thanks for your comments and review about your car, sounds like fun.
Yeah, I had a friend with me and we were both chuckling at watching the M5 slide around the track. It was a pretty great example of car handling. Moving forward I'll have a GoPro mounted to the cage to catch stuff like that.
Appreciate 1
COChris887.50
      01-24-2020, 01:30 PM   #40
gsrbri
Lieutenant
gsrbri's Avatar
United_States
560
Rep
570
Posts

Drives: F87 6MT
Join Date: Jul 2011
Location: Boston, MA

iTrader: (0)

You need these
Attached Images
   
Appreciate 1
cncmastr1568.50
      01-25-2020, 10:54 PM   #41
pruettfan
Brigadier General
1622
Rep
3,402
Posts

Drives: 2017 M2, LBB, DCT, Exec
Join Date: Jul 2009
Location: Chandler, AZ

iTrader: (0)

I thought I would share what I learned about the carbon ceramic brakes at the Advanced M School. I spoke with instructors and the tech at the Performance Driving School at Thermal. They said their rotors last about 7-8,000 track miles. In daily driving miles it doesn't sound like much but for dedicated track cars with a mix of students I was fairly impressed. Especially after hearing some stories about Porsche carbon ceramics from the GT3 guys. They order all M4/3 with CC because they hold up better to track use that the standard brakes. That is why the M2 is limited to the smaller track near the school or short low speed drills on the larger tracks.
Appreciate 0
      04-16-2020, 01:32 PM   #42
Gomeler
Lieutenant
500
Rep
411
Posts

Drives: '16 M235iR, '16 M4 GTS
Join Date: Jun 2019
Location: Boulder, CO

iTrader: (0)

Brakes acquired

Whelp, rebuilding my STI took longer than expected(engine goes in next week) and COVID-19 shut down my local tracks, so I haven't pulled the car out of storage. I did however pickup a decently priced set of used AP Racing calipers, so that'll address my concerns on the operating costs of the CCBs. It'll also enable running 18" wheels.

I spoke with Apex, I'll be trying to fit their EC-7 in 18x11 ET44 on all four corners. The goal is to buy 8 wheels, wrap 4 in NT01, wrap 4 in RE-71R, and keep a rolling review of them for a few weekends. My favorite local track abuses the heck out of the left front, so I'm hoping by running a square setup I'll be able to maximize tire longevity.

Lastly I need to order some rear toe links, and some extended wheel studs. I suspect going with the square contact patch is going to cause me to want a little more rear positive toe to balance out oversteer until I get more accustomed to the platform.

Last bit will be installing my harnesses and seats. Need to do some research to see what options there are, I'm guessing I'll go with a weld-in sub strap and some brackets with sliders. I'll likely get a session or two in before I accomplish this, it's been a long winter and the sport cup 2s need to get burnt up.

Definitely not unwrapping presents in the living room while the wife and newborn sleep upstairs

Name:  APBrakes.jpg
Views: 753
Size:  415.2 KB
Appreciate 1
Lienrocs701.00
      06-14-2020, 09:55 PM   #43
Gomeler
Lieutenant
500
Rep
411
Posts

Drives: '16 M235iR, '16 M4 GTS
Join Date: Jun 2019
Location: Boulder, CO

iTrader: (0)

Finally found a used set of 18x10/18x11 EC-7, should arrive tomorrow. I'm really hoping the 18x11 fits up front with a 25mm spacer, we'll find out.

Since the wheels/tires are arriving, I figured it's time to wrench on this car again.

Alignment at SCR last Friday. I've had a pretty great relationship with this shop over the years, they've done my race cars and my canyon cars.

Name:  IMG_20200612_142033.jpg
Views: 700
Size:  347.2 KB

Dyno on Saturday at PFI Speed for NASA TT classification. Turns out water injection isn't working so.. it made ~447whp

Name:  IMG_20200613_120251.jpg
Views: 659
Size:  354.0 KB

IAG Stage 4 heads arrived for the Subaru. The CNC work is amazing. Will assemble the longblock once the GTS is trackable.

Name:  IMG_20200611_222437.jpg
Views: 689
Size:  340.8 KB

Got the right front hung and the baby called it quits. They're used but I figure the rings should last long enough for me to decide if I enjoy tracking this car, and if not I revert it to CCBs and take a minimal hit on reselling the kit.

Name:  IMG_20200614_174900.jpg
Views: 823
Size:  214.1 KB

The goal is to finish up the brake swap tonight. Bleed the calipers tomorrow and then stand on the pedal in the garage to confirm no leaks. BMW appointment on Tuesday to figure out the water injection system, and then half a lapping day on Friday to confirm everything is working. NASA has a race weekend 26th-27th, not sure if my wife will go for me being away Friday-Sunday, but maybe I can get 1 day out there.
Appreciate 1
fanatic11018.50
      06-14-2020, 11:30 PM   #44
Lienrocs
Captain
Lienrocs's Avatar
701
Rep
867
Posts

Drives: E92 M3, M4 GTS, HP4
Join Date: May 2017
Location: Austin

iTrader: (3)

Quote:
Originally Posted by Gomeler View Post
Finally found a used set of 18x10/18x11 EC-7, should arrive tomorrow. I'm really hoping the 18x11 fits up front with a 25mm spacer, we'll find out.

Since the wheels/tires are arriving, I figured it's time to wrench on this car again.

Alignment at SCR last Friday. I've had a pretty great relationship with this shop over the years, they've done my race cars and my canyon cars.

Attachment 2338761

Dyno on Saturday at PFI Speed for NASA TT classification. Turns out water injection isn't working so.. it made ~447whp

Attachment 2338760

IAG Stage 4 heads arrived for the Subaru. The CNC work is amazing. Will assemble the longblock once the GTS is trackable.

Attachment 2338757

Got the right front hung and the baby called it quits. They're used but I figure the rings should last long enough for me to decide if I enjoy tracking this car, and if not I revert it to CCBs and take a minimal hit on reselling the kit.

Attachment 2338758

The goal is to finish up the brake swap tonight. Bleed the calipers tomorrow and then stand on the pedal in the garage to confirm no leaks. BMW appointment on Tuesday to figure out the water injection system, and then half a lapping day on Friday to confirm everything is working. NASA has a race weekend 26th-27th, not sure if my wife will go for me being away Friday-Sunday, but maybe I can get 1 day out there.
I'm not sure whah the effective offset will be with the 25mm spacer on the 18 by 11 up front but I just pull the rears off my e92 ( 18 by 11 et24 with a 295/30/18 A052 and it fit with almost no issues. The offset is a little too aggressive but I'm pretty sure I could still make it function really well if I wanted to. The car is way too low right now, I just smashed the new suspension on and figured what the heck, give it a go. But if you played around with the offset by swapping spacers an 18 by 11 square set up with a 295/30 is a no brainer!
Attached Images
   
Appreciate 3
Gomeler500.00
fanatic11018.50
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 07:00 PM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST