Coby Wheel
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
      06-15-2020, 02:49 AM   #45
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Quote:
Originally Posted by Lienrocs View Post
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!
I've got 18x11 ET44, which are Apex's EC-7 for the rear of the F8x. Hoping to be able to rotate front/rear. In theory I'll end up with a 19mm offset, which should clear the coilover with little bit of space, and should clear the fender. I've seen a few cars run 18x11 squared, so I'm pretty confident it'll work under cornering compression.

Curious how those Ohlins work out for you vs the clubsports.

edit: Which brakelines are you using for your AP Racing calipers?
Appreciate 0
      06-15-2020, 04:32 AM   #46
Lienrocs
Captain
Lienrocs's Avatar
548
Rep
736
Posts

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

iTrader: (3)

Quote:
Originally Posted by Gomeler View Post
Quote:
Originally Posted by Lienrocs View Post
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!
I've got 18x11 ET44, which are Apex's EC-7 for the rear of the F8x. Hoping to be able to rotate front/rear. In theory I'll end up with a 19mm offset, which should clear the coilover with little bit of space, and should clear the fender. I've seen a few cars run 18x11 squared, so I'm pretty confident it'll work under cornering compression.

Curious how those Ohlins work out for you vs the clubsports.

edit: Which brakelines are you using for your AP Racing calipers?
In my very non expert opinion a 19mm offset my be slightly too aggressive. But again, it depends on ride height and camber you have dialed in. The good thing is if a 25mm spacer does end up being too much it's really easy to swap to a slightly smaller one and you'll be able to dial it in.

I'll let you know how the ohlins set up works! There wasn't anything wrong with the stock 3 ways. It was just sort of an impulse decision and I think they're gonna take some fiddling to make them work but I hope they make a change for the better in the long run.

They're spiegler lines.
Appreciate 1
Gomeler411.00
      06-15-2020, 09:12 AM   #47
Flashstar
Brand New
Flashstar's Avatar
France
39
Rep
70
Posts

Drives: BMW M3
Join Date: Jun 2020
Location: France

iTrader: (0)

Quote:
Originally Posted by Gomeler View Post
Correct solution.
In general - friends barbarians, take pity on the car, it is not for racing, but for the collection.
__________________
/// True M3 V8 Competition ///
Appreciate 0
      06-17-2020, 01:22 AM   #48
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Clip from the car on the dyno on Saturday. The GoPro microphone just doesn't do the exhaust justice. Going back once the water injection is working.

Appreciate 1
FormulaMMM2813.50
      06-17-2020, 08:18 AM   #49
FormulaMMM
Brigadier General
FormulaMMM's Avatar
United_States
2814
Rep
3,126
Posts

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

iTrader: (2)

Quote:
Originally Posted by Gomeler View Post
Clip from the car on the dyno on Saturday. The GoPro microphone just doesn't do the exhaust justice. Going back once the water injection is working.

Sounds killer. Loud as hell stock.

Put a gopro on my interior windshield for last track day, captured nearly everything even with windows down.

Helmet on you can hear every prod of the throttle. and the "brrr-aaack!" as you move from on to off throttle is amazing.

Do you have 6 pt? That adds to because the rumble comes through the cage and down the shoulder harnesses.

Glad to hear you're getting the water system sorted.
__________________
M4 GTS, Z/28, GT3, C63 S | E90 M3s, E39 M5

Appreciate 0
      06-17-2020, 09:34 AM   #50
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Will be installing my seats and harnesses in July or August. The car is fast enough that I'm losing time sliding in the seat.
Appreciate 0
      06-17-2020, 09:36 AM   #51
FormulaMMM
Brigadier General
FormulaMMM's Avatar
United_States
2814
Rep
3,126
Posts

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

iTrader: (2)

Quote:
Originally Posted by Gomeler View Post
Will be installing my seats and harnesses in July or August. The car is fast enough that I'm losing time sliding in the seat.
Without a doubt..
__________________
M4 GTS, Z/28, GT3, C63 S | E90 M3s, E39 M5

Appreciate 0
      06-17-2020, 05:04 PM   #52
redrumm3
Second Lieutenant
redrumm3's Avatar
350
Rep
237
Posts

Drives: M4 GTS, M3 GT4, E30 M3...
Join Date: Mar 2012
Location: FL

iTrader: (0)

Quote:
Originally Posted by Gomeler View Post
Will be installing my seats and harnesses in July or August. The car is fast enough that I'm losing time sliding in the seat.
It makes a huge difference!
Appreciate 0
      06-28-2020, 03:02 PM   #53
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Got out to the track a week ago, it had been ~7-8 months so there was some serious rust removal needed. Looped the car twice in 2.5 hours, both times I just wasn't paying enough attention and outright failed to even try to counter-steer and throttle out. Luckily I was taking all of the high-speed corners pretty casual, so both spins were medium-speed 50mph corners.



The NT01s have an unknown number of heat cycles on them, I primarily wanted the wheels, but I'm not very impressed with their grip. The AP Racing brakes were stellar, I'm overbraking the two high-speed corners by 10+mph with zero fade even after a 45 minute. I was struggling with front-end grip on the NT01s, I missed several braking zones like in this short clip going into T1 at High Plains Raceway. Admittedly I was struggling with tire pressures all day, finally got it sorted in the 4th session, but the front-end grip still felt down compared to the Sport Cup 2.

This is the only clean session I have a recording of, the GoPro overheated after the third session. It is a shame as my fifth session I was mostly alone for 45 minutes and really got to practice a few corners. Drove the car until it fuel starved on a medium-speed right hander.



Once again the seat in the car is a major failure. I've got a pretty narrow waist and I'm just sliding around. My throttle/brake/wheel inputs were all over the place under threshold braking or really pushing corners. I like to two-foot the pedal box on DCTs, but I really need a 6-point to not necessitate using the wheel as a stability device.
Appreciate 1
Lienrocs547.50
      06-28-2020, 04:36 PM   #54
Deda
Major General
Deda's Avatar
Croatia
482
Rep
7,019
Posts

Drives: BMW M5 comp
Join Date: Apr 2008
Location: Croatia

iTrader: (0)

Is that stock titanium exhaust?
Appreciate 0
      06-28-2020, 09:35 PM   #55
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Quote:
Originally Posted by Deda View Post
Is that stock titanium exhaust?
Yup, and the outer bypass tips are definitely seeing some heat. The inner muffled tips are still just shiny titanium.

Name:  IMG_20200619_091224.jpg
Views: 486
Size:  232.4 KB
Appreciate 0
      06-28-2020, 11:07 PM   #56
Deda
Major General
Deda's Avatar
Croatia
482
Rep
7,019
Posts

Drives: BMW M5 comp
Join Date: Apr 2008
Location: Croatia

iTrader: (0)

Quote:
Originally Posted by Gomeler View Post
Quote:
Originally Posted by Deda View Post
Is that stock titanium exhaust?
Yup, and the outer bypass tips are definitely seeing some heat. The inner muffled tips are still just shiny titanium.

Attachment 2350645
Wow..and that sound in cockpit(not cabin&#128522 is just amazing!

Cant wait to put hands on mine...arrives in few days.
Appreciate 0
      06-29-2020, 06:07 AM   #57
Flashstar
Brand New
Flashstar's Avatar
France
39
Rep
70
Posts

Drives: BMW M3
Join Date: Jun 2020
Location: France

iTrader: (0)

How often do you change oil?
__________________
/// True M3 V8 Competition ///
Appreciate 0
      06-29-2020, 06:49 AM   #58
CanAutM3
General
CanAutM3's Avatar
Canada
17242
Rep
19,443
Posts

Drives: 2019 M4cs
Join Date: Jan 2012
Location: Montreal

iTrader: (0)

Garage List
2019 BMW M4cs  [0.00]
2018 Audi RS3  [0.00]
Quote:
Originally Posted by Gomeler View Post
Got out to the track a week ago, it had been ~7-8 months so there was some serious rust removal needed. Looped the car twice in 2.5 hours, both times I just wasn't paying enough attention and outright failed to even try to counter-steer and throttle out. Luckily I was taking all of the high-speed corners pretty casual, so both spins were medium-speed 50mph corners.



The NT01s have an unknown number of heat cycles on them, I primarily wanted the wheels, but I'm not very impressed with their grip. The AP Racing brakes were stellar, I'm overbraking the two high-speed corners by 10+mph with zero fade even after a 45 minute. I was struggling with front-end grip on the NT01s, I missed several braking zones like in this short clip going into T1 at High Plains Raceway. Admittedly I was struggling with tire pressures all day, finally got it sorted in the 4th session, but the front-end grip still felt down compared to the Sport Cup 2.

This is the only clean session I have a recording of, the GoPro overheated after the third session. It is a shame as my fifth session I was mostly alone for 45 minutes and really got to practice a few corners. Drove the car until it fuel starved on a medium-speed right hander.



Once again the seat in the car is a major failure. I've got a pretty narrow waist and I'm just sliding around. My throttle/brake/wheel inputs were all over the place under threshold braking or really pushing corners. I like to two-foot the pedal box on DCTs, but I really need a 6-point to not necessitate using the wheel as a stability device.
Can't help noticing your seating position, you're sitting way too far from the steering wheel, which hurts your ability to recover from spins. When properly seated, your elbows should be at a right angle. Another way of checking for proper seating distance is by pressing both shoulder blades in the seatback, you should be able to rest both wrists on the top of the steering wheel. With this proper seating position, you'll be able to do over 180deg of steering rotation without having to move your hands from 9-3 position.
__________________
///M4cs 2019 F82 Lime Rock Grey
MPE / CF Mirror caps / MP-HAS / GC Camber plates
Appreciate 2
      06-29-2020, 06:51 AM   #59
CanAutM3
General
CanAutM3's Avatar
Canada
17242
Rep
19,443
Posts

Drives: 2019 M4cs
Join Date: Jan 2012
Location: Montreal

iTrader: (0)

Garage List
2019 BMW M4cs  [0.00]
2018 Audi RS3  [0.00]
Quote:
Originally Posted by Gomeler View Post
The inner muffled tips are still just shiny titanium.
As far as I know, all four tips are functional at all times, valves open or not...
__________________
///M4cs 2019 F82 Lime Rock Grey
MPE / CF Mirror caps / MP-HAS / GC Camber plates

Last edited by CanAutM3; 06-29-2020 at 11:04 PM..
Appreciate 0
      06-29-2020, 06:52 AM   #60
CanAutM3
General
CanAutM3's Avatar
Canada
17242
Rep
19,443
Posts

Drives: 2019 M4cs
Join Date: Jan 2012
Location: Montreal

iTrader: (0)

Garage List
2019 BMW M4cs  [0.00]
2018 Audi RS3  [0.00]
Quote:
Originally Posted by Deda View Post
Wow..and that sound in cockpit(not cabin��) is just amazing!

Cant wait to put hands on mine...arrives in few days.
From the sound of it, my hunch is that it was taken with an external mic mounted on the rear bumper (OP please correct me if I'm mistaken).
__________________
///M4cs 2019 F82 Lime Rock Grey
MPE / CF Mirror caps / MP-HAS / GC Camber plates
Appreciate 0
      06-29-2020, 11:10 AM   #61
kupcake
Private
18
Rep
60
Posts

Drives: M4 GTS
Join Date: Aug 2016
Location: Colorado

iTrader: (0)

Nicely done! HPR is my home track as well.
Appreciate 0
      06-29-2020, 11:59 AM   #62
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Quote:
Originally Posted by CanAutM3 View Post
Can't help noticing your seating position, you're sitting way too far from the steering wheel, which hurts your ability to recover from spins. When properly seated, your elbows should be at a right angle. Another way of checking for proper seating distance is by pressing both shoulder blades in the seatback, you should be able to rest both wrists on the top of the steering wheel. With this proper seating position, you'll be able to do over 180deg of steering rotation without having to move your hands from 9-3 position.
I normally would like to be closer to the wheel, but I was really struggling with pedal comfort + holding myself in the seat with the wheel. The ergonomics of this car are pretty shit for track use.

Quote:
Originally Posted by Flashstar View Post
How often do you change oil?
I'll probably change out the oil every ~10 hours on the track. There's no way I'll change oil based on mileage or age.

Quote:
Originally Posted by CanAutM3 View Post
As far as I know, all four tips are functional at all times, valves open or not...
The inner tips are functional, but based on the IR thermometer and the coloring of the titanium, the majority of the exhaust is flowing through the outer tips.

Quote:
Originally Posted by CanAutM3 View Post
From the sound of it, my hunch is that it was taken with an external mic mounted on the rear bumper (OP please correct me if I'm mistaken).
Yup, external mic clipped to the license plate. In the cabin above 50mph all you hear is wind noise. The car does sound great below 50mph with the windows down though.

Quote:
Originally Posted by kupcake View Post
Nicely done! HPR is my home track as well.
Really love this course, so glad it's only ~2 hours away.
Appreciate 1
CanAutM317242.00
      06-29-2020, 09:08 PM   #63
FormulaMMM
Brigadier General
FormulaMMM's Avatar
United_States
2814
Rep
3,126
Posts

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

iTrader: (2)

Quote:
Originally Posted by Gomeler View Post
Yup, and the outer bypass tips are definitely seeing some heat. The inner muffled tips are still just shiny titanium.
Same here. And check out the uneven heat signature on the box



__________________
M4 GTS, Z/28, GT3, C63 S | E90 M3s, E39 M5

Appreciate 1
CanAutM317242.00
      06-29-2020, 11:03 PM   #64
CanAutM3
General
CanAutM3's Avatar
Canada
17242
Rep
19,443
Posts

Drives: 2019 M4cs
Join Date: Jan 2012
Location: Montreal

iTrader: (0)

Garage List
2019 BMW M4cs  [0.00]
2018 Audi RS3  [0.00]
Quote:
Originally Posted by Gomeler View Post
Quote:
Originally Posted by CanAutM3 View Post
Quote:
Originally Posted by Gomeler View Post
The inner muffled tips are still just shiny titanium.
As far as I know, all four tips are functional at all times, valves open or not...
The inner tips are functional, but based on the IR thermometer and the coloring of the titanium, the majority of the exhaust is flowing through the outer tips.
Indeed, the outer tips on my MPE also show more heat discolouration. However, I still think it is inaccurate to define the inner tips as being the "muffled ones". If you look at the piping arrangement, you can see that the exhaust gases have a more natural and direct path to the outer tips when exiting the rear silencer. If anything, the outer tips see more flow in the muffled (closed valve) configuration.
Attached Images
 
__________________
///M4cs 2019 F82 Lime Rock Grey
MPE / CF Mirror caps / MP-HAS / GC Camber plates

Last edited by CanAutM3; 06-30-2020 at 09:06 AM..
Appreciate 1
FormulaMMM2813.50
      06-30-2020, 02:26 PM   #65
Gomeler
First Lieutenant
411
Rep
363
Posts

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

iTrader: (0)

Quote:
Originally Posted by CanAutM3 View Post
Indeed, the outer tips on my MPE also show more heat discolouration. However, I still think it is inaccurate to define the inner tips as being the "muffled ones". If you look at the piping arrangement, you can see that the exhaust gases have a more natural and direct path to the outer tips when exiting the rear silencer. If anything, the outer tips see more flow in the muffled (closed valve) configuration.
You're probably right, I have not shined a light into the tip to see how the merger between the muffler and the bypass is routed. Just noticed the color discoloration on a walk-around to check tires/suspension.

Quote:
Originally Posted by FormulaMMM View Post
Same here. And check out the uneven heat signature on the box
That's some impressive color change. Looking good!
Appreciate 0
      07-02-2020, 09:25 PM   #66
fanatic1
Captain
fanatic1's Avatar
United_States
813
Rep
743
Posts

Drives: 2019 M4 CS
Join Date: Sep 2010
Location: Encinitas/San Diego

iTrader: (0)

Garage List
2019 M4CS  [0.00]
Quote:
Originally Posted by Gomeler View Post
You're probably right, I have not shined a light into the tip to see how the merger between the muffler and the bypass is routed. Just noticed the color discoloration on a walk-around to check tires/suspension.



That's some impressive color change. Looking good!
Tips look quite different from MPE with Ti tips
Attached Images
 
__________________
19 M4 CS LRG MPE
Appreciate 0
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 01:16 PM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, 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