chris_flies' 128i thread

[One28i]

Chris, nice work and write up. inspired. I too just picked up a 128i under a year ago. base model, only option was M sport. it is manual trans, manual seats, no sunroof, no nav, no leather. Like what you have done here. I have gathered a lot of parts since I got the ride, just no time to install, but with the cooler climate coming (I am above the 49th parallel) we get things rolling hopefully.

Evan nice to see your into he NA 1 series as well.

[chris_flies]

Originally Posted by One28i

Chris, nice work and write up. inspired. I too just picked up a 128i under a year ago. base model, only option was M sport. it is manual trans, manual seats, no sunroof, no nav, no leather. Like what you have done here. I have gathered a lot of parts since I got the ride, just no time to install, but with the cooler climate coming (I am above the 49th parallel) we get things rolling hopefully.

Evan nice to see your into he NA 1 series as well.

Thanks!

It sounds like a nicely-specked car! I'm kinda jealous of slick-top cars, tbh...

I'm really looking forward to this cooler weather moving through, I've got to change my diff and trans fluid which I've been putting-off for too long (been too busy). There's also a 180k mile oil change coming up...

[Nad128]

Originally Posted by chris_flies

I've changed the drückmodell (pressure modeling) on the front brakes to reflect 135i brakes (I have 4-piston brakes, so they're pretty close) and that firmed the pedal up really nicely and makes the braking much more confidence-inspiring.

[...]

I also changed the oversteer friction coefficients to 1M values

Interesting... where can I find more info about this? Or can you share your new settings?

[chris_flies]

Nad128
OnerDriver

https://www.1addicts.com/forums/show...1216642&page=5

That's the thread I got my settings from. I can get my current settings, but it'll be a few days before I have the opportunity to do so.

The 1M oversteer coefficient was the most notable change (especially in the rain), the car is a little drift machine now, and gets sideways at the first thought of throttle input. But, it's a controllable slide, and the computer is still there (unlike with everything off) to nudge you back into line if it gets too crazy.

https://bmw135iblog.wordpress.com/20...track-nannies/

That has to be the quintessential blog posting for nanny coding in these cars. All those things make for a more consistent, natural feel (the computers aren't augmenting anything, or masking issues) to the car, that's really enjoyable on the track. It's the same as the X1 one that everyone else references, but he modified it with 135i features (instead of the X1 and 335xi features). http://www.onelapx1.com/blog/how-to-...w-actually-fun

[Nad128]

Awesome. Thanks for the reply

[chris_flies]

Originally Posted by OnerDriver

Thanks, I coded some of them (mostly the understeer ones) and will see how they work tonight!

You mean oversteer? If you coded understeer, then please be careful and don't Audi it into a tree... (I think that's how it works)

[chris_flies]

Originally Posted by OnerDriver

The "dummy" name for the values is understeer friction something.

Untersteuerschwelle? That (if I remember my German) is understeer.

There should be one for uebersteuern (oversteer) with mue_0 or mue_1_2 behind it, that's the change I made.

EDITED

[chris_flies]

Originally Posted by OnerDriver

UEBERSTEUERN_MUE_0 // Understeer Friction Coefficient 0

You are correct.

We should modify the translations file for NCSDummy! thanks!

No problem, I don't want the 1'er to be a meme, unless it is for mad (rear end) skids

[duder13]

Originally Posted by chris_flies

The 1M oversteer coefficient was the most notable change (especially in the rain), the car is a little drift machine now, and gets sideways at the first thought of throttle input. But, it's a controllable slide, and the computer is still there (unlike with everything off) to nudge you back into line if it gets too crazy.

Hi, Chris. I'm not totally clear which coding mod is the 1M oversteer coefficient. Also, is this something only to be done if we have an LSD? Thanks!

[chris_flies]

Originally Posted by duder13

Hi, Chris. I'm not totally clear which coding mod is the 1M oversteer coefficient. Also, is this something only to be done if we have an LSD? Thanks!

Take a look at the first link I posted above (post no. 127 or so), it's a whole thread related to coding these things.

[duder13]

Originally Posted by chris_flies

Take a look at the first link I posted above (post no. 127 or so), it's a whole thread related to coding these things.

Thanks. I read through all those links, but I’m not exactly sure which thing you’re talking about, in terms of 1M settings. Is it CBC?

[chris_flies]

Originally Posted by OnerDriver

It's called coding, you need a Windows laptop with NCS Expert to modify settings in the modules, with an OBD2 to USB cable.

And you should be coding the DSC module.

[duder13]

Originally Posted by OnerDriver

It's called coding, you need a Windows laptop with NCS Expert to modify settings in the modules, with an OBD2 to USB cable.

Sorry, I must not be clear. I understand what coding is. I'm just wondering which coding change Chris is referring to when he says "The 1M oversteer coefficient." Is it the CBC setting?

[duder13]

Originally Posted by OnerDriver

Oh ok.

The settings are on page 5 of the first link he posted above (in a post of 3 links).

But I'd still like to see his trc file because it didn't change much for me...

I didn't realize he changed all of those settings. When I read the following, it sounded like one setting in particular works well, so I was trying to figure out which specific setting that is.

"The 1M oversteer coefficient was the most notable change (especially in the rain), the car is a little drift machine now, and gets sideways at the first thought of throttle input. But, it's a controllable slide, and the computer is still there (unlike with everything off) to nudge you back into line if it gets too crazy."

[duder13]

Originally Posted by OnerDriver

You can change all those but they're not all for the DTC becoming more permissive. I didn't do all because I like diff-lock and other things.

But we discussed the changes in posts above this one after the links:

UEBERSTEUERN_MUE_

Thanks. I agree, so I was wondering if there was a single setting that allowed for more "1M like" sliding, like Chris seemed to be saying.

[Zombie_Head]

Originally Posted by chris_flies

You mean oversteer? If you coded understeer, then please be careful and don't Audi it into a tree... (I think that's how it works)

Audisteer....XD

i will play with those settings later this winter once im done moving and get the LSD installed.

[chris_flies]

Yesterday, I placed an order for a set of Ohlins Road & Track coilovers!

Thanks to Barry from 3DM Motorsports for hooking me up with a great set of custom options at a pretty great price:
-1M spec valving (tighter low-speed damping + matched to spring rates)
-7" 60N/mm Ohlins brand front springs (shorter than standard spring for wheel/tire clearance)
-160N/mm Swift brand rear springs (solid bushings allow higher rates)
All shipped to my home for $2225.

I'll be documenting my initial impressions, initial installation, and final set-up in this thread. They should ship-out at the end of next week, and I cannot wait to install them!

[$iriu$black]

Originally Posted by chris_flies

My style 256’s needed 10mm spacer to clear the spokes, but diameter wise, the grey calipers clear with minimal room to spare. My SE16’s clear the calipers without changes.

Hey chris_flies , would you happen to know if these F30 calipers clear the 207M 17in wheels for our cars?

Also, would you mind giving the p/n for the rotors that you used? I was hoping to do this upgrade if the right deal comes.

Do you feel that the brake bias is disrupted by the upgrade?

Thanks for the help mate!

[chris_flies]

Originally Posted by $iriu$black

Hey chris_flies , would you happen to know if these F30 calipers clear the 207M 17in wheels for our cars?

Also, would you mind giving the p/n for the rotors that you used? I was hoping to do this upgrade if the right deal comes.

Do you feel that the brake bias is disrupted by the upgrade?

Thanks for the help mate!

They clear my standard 256 wheels clear with a 10mm spacer. It's really tight in there though. I used StopTech Sport Slotted rotors for the 2013 335i. Part numbers are 126.34141SR and 126.34141SL. They're about $150/rotor on Amazon.

Brake bias doesn't feel any different. I can still lock up all four wheels (if I didn't have ABS) on-demand, and stopping power is exactly the same as stock would be, since it's limited by tires. The only benefit are the looks (they look nice, but need to be powder coated), easier brake pad swaps, and greater thermal capacity (larger rotors).

[$iriu$black]

Originally Posted by chris_flies

They clear my standard 256 wheels clear with a 10mm spacer. It's really tight in there though. I used StopTech Sport Slotted rotors for the 2013 335i. Part numbers are 126.34141SR and 126.34141SL. They're about $150/rotor on Amazon.

Brake bias doesn't feel any different. I can still lock up all four wheels (if I didn't have ABS) on-demand, and stopping power is exactly the same as stock would be, since it's limited by tires. The only benefit are the looks (they look nice, but need to be powder coated), easier brake pad swaps, and greater thermal capacity (larger rotors).

Thanks chris_flies. What about brake pedal feel? I’ve read some people switch up to a different MC such as one from a 135. Is this required to get stock pedal feel? I like the way the stock pedal feel is w the OEM brakes and was thinking that this upgrade to multiple pistons from a single will/might affect this.

[chris_flies]

Originally Posted by $iriu$black

Thanks chris_flies. What about brake pedal feel? I’ve read some people switch up to a different MC such as one from a 135. Is this required to get stock pedal feel? I like the way the stock pedal feel is w the OEM brakes and was thinking that this upgrade to multiple pistons from a single will/might affect this.

The pedal is a little longer, but the feel didn't change much. It still has that nice linear BMW quality to it.

[chris_flies]

Long overdue update to this thread:

-Installed Ohlins (wow this is long overdue)
-Installed AKG solid motor mounts (they're hateful and amazing at the same time)
-Completed M3 instrument cluster retrofit
-Replaced battery
-135i PE y-pipe and Corsa Performance axle-back being installed later this week
-Front strut mounts are bad
-Rear shock mounts are worn
-Ambient temp sensor has failed
-3.73 LSD blew. Twice. Being sad and punting around with open 3.23. I have a new appreciation for the importance of an LSD. Once was ring gear bolts not loc-tited, second was catastrophic leak of fluid
-Made it 1,300 miles to Texas for college

Now sitting at 195,800 miles.