Mod list to make a 135i outrun a 2018 M2

[xQx]

This is hardly worth its own thread, but I didn't have anywhere else to put it..

What would be your expected modifications required to build a 135i with a power curve that matches/exceeds a S55 and handling to match a new M2 or M4 coupe (if it's even possible).

(I expect it'd be a significant list, but am interested to know anyway)

[swunder]

I don't know crap but I'd bet a tune + M3 suspension parts would be close. The cars aren't that far apart stock.

Lots of 135i's on this board pushing 400+ hp.

[duder13]

Hmmm. Well, the M2 Comp is a couple of hundred pounds heavier than an N55 135i, so, to get these same power to weight ratio, you only need to get the 135i to around 380hp, which is pretty easily doable with tuning and bolt ons. Do an M3 suspension swap, better than M2 shocks, new wheels/tires, an LSD and better brakes, and you’ll be doing well.

[c1pher]

Originally Posted by duder13

Hmmm. Well, the M2 Comp is a couple of hundred pounds heavier than an N55 135i, so, to get these same power to weight ratio, you only need to get the 135i to around 380hp, which is pretty easily doable with tuning and bolt ons. Do an M3 suspension swap, better than M2 shocks, new wheels/tires, an LSD and better brakes, and you’ll be doing well.

It’s a little more work if you’re talking M2C but if you’re talking regular M2 (since you mention 2018), a simple tune like a Dinah Stage 2 and then beefing up handling will get you there.

[Lucky1]

Originally Posted by MGM135is

It's a little more work if you're talking M2C but if you're talking regular M2 (since you mention 2018), a simple tune like a Dinah Stage 2 and then beefing up handling will get you there.

Sure but will it be able to put down as many laps on the track as the M2 or M2C? There's more to the engine differences than power alone. What cooling modifications would be needed if you wanted more than just occasional "street" power?

[xQx]

Originally Posted by duder13

Hmmm. Well, the M2 Comp is a couple of hundred pounds heavier than an N55 135i, so, to get these same power to weight ratio, you only need to get the 135i to around 380hp, which is pretty easily doable with tuning and bolt ons. Do an M3 suspension swap, better than M2 shocks, new wheels/tires, an LSD and better brakes, and you’ll be doing well.

Wow, you're not wrong, I thought it was a lot more than that. I should've used google - a brand new S55 M4 makes 425hp at the flywheel. A FBO 135i with an OTS stage-2 tune and stock turbos makes 380hp at the wheels on 98ron fuel.

(These numbers can't be directly compared, but the top search result in google estimates 380 atw = 440 at the flywheel)

I often under-estimate this car.

[xQx]

Originally Posted by Lucky1

Sure but will it be able to put down as many laps on the track as the M2 or M2C? There's more to the engine differences than power alone. What cooling modifications would be needed if you wanted more than just occasional "street" power?

Yeah, I can answer that one

Everybody focuses on dyno power or sprint times - but 2/3rds of the cost are in making that reliable and able to turn corners.

To beat a M2 on the street (based on the responses above) you probably just need FBO, Stage 2 Tune, Shocks, Control arms, Tires, RSFB and a LSD.

To beat the M2 on the track you'll need a BBK and a much bigger oil cooler - and if it was a track-focused build, you'd drop in coilovers rather than upgraded shocks.

[duder13]

Originally Posted by Lucky1

Sure but will it be able to put down as many laps on the track as the M2 or M2C? There's more to the engine differences than power alone. What cooling modifications would be needed if you wanted more than just occasional "street" power?

Shouldn’t be hard. I run MHD stage 1 at track days no problem on a stock car. Getting another 30hp via some bolt ons should be fine. Now, is the modded 135i gonna have the same longevity as an M2 comp if one tracks every day for 40,000 miles? Probably not.

[duder13]

Originally Posted by MGM135is

It’s a little more work if you’re talking M2C but if you’re talking regular M2 (since you mention 2018), a simple tune like a Dinah Stage 2 and then beefing up handling will get you there.

I was talking about the M2C. It’s a couple of hundred pounds heavier than an N55 135i, so, while it runs 405hp, you only need around 380hp to match it in terms of power to weight. Of course, getting things like lighter wheels will make the weight gap grow even more.

[c1pher]

Originally Posted by duder13

I was talking about the M2C. It’s a couple of hundred pounds heavier than an N55 135i, so, while it runs 405hp, you only need around 380hp to match it in terms of power to weight. Of course, getting things like lighter wheels will make the weight gap grow even more.

There is no 2018 M2C but I understand what you mean.

[c1pher]

Originally Posted by duder13

Shouldn’t be hard. I run MHD stage 1 at track days no problem on a stock car. Getting another 30hp via some bolt ons should be fine. Now, is the modded 135i gonna have the same longevity as an M2 comp if one tracks every day for 40,000 miles? Probably not.

I’ve been reading where the M2 doesn’t hold up as long as everyone initially said. Brake fade is apparent as is heatsoak. I think if you want to pound an M2 on a track all day, you need the M2C.

[duder13]

Originally Posted by MGM135is

There is no 2018 M2C but I understand what you mean.

I guess I’m confused. Where are you getting 2018 from? The OP said a new M2, which is the M2C.

[c1pher]

Originally Posted by duder13

I guess I’m confused. Where are you getting 2018 from? The OP said a new M2, which is the M2C.

The 2019 is the M2C. 2018 is final year of M2. There are still new 2018 M2 in stock.

[c1pher]

Originally Posted by duder13

I guess I’m confused. Where are you getting 2018 from? The OP said a new M2, which is the M2C.

His initial post said 2018 M2. Read the title.

[duder13]

Originally Posted by MGM135is

His initial post said 2018 M2. Read the title.

Gotcha. Didn’t notice the 2018 in the title. In any case, you still only need about 380hp in the N55 135i to reach a similar power to weight ratio as the M2C. For the regular M2, it would be 15-20hp less.

[ShocknAwe]

Get yourself the pure S2 turbo. Conservative custom flash, ALL supporting mods/FBO, then jump straight to coilovers, solid RSFBs, lsd, M3 front control arms, rear guide rod, and aftermarket toe arm of your choice. I'd also recommend a diff lockdown bracket and keep your diff bushings stock.

If you start running into cooling issues, CSF radiator and a bigger oil cooler.

[chris_flies]

Better question: what will it take to get a 128i to be as fast (in the corners, obviously)?

Slicks, diff, full poly/solid bushings, coilovers, bracing, etc.

Even better question: what to do to make 135i as fast as M2, and as reliable and refined for daily driving?

[Captain Blood]

Originally Posted by xQx

This is hardly worth its own thread, but I didn't have anywhere else to put it..

What would be your expected modifications required to build a 135i with a power curve that matches/exceeds a S55 and handling to match a new M2 or M4 coupe (if it's even possible).

(I expect it'd be a significant list, but am interested to know anyway)

All you need are these parts, and you are good to go.


ps I saw one of these driving down a local street last week. And it wasn't a new one. Quite amazing.

[mfindigital]

Originally Posted by duder13

Hmmm. Well, the M2 Comp is a couple of hundred pounds heavier than an N55 135i, so, to get these same power to weight ratio, you only need to get the 135i to around 380hp, which is pretty easily doable with tuning and bolt ons. Do an M3 suspension swap, better than M2 shocks, new wheels/tires, an LSD and better brakes, and you’ll be doing well.

Are brakes really an issue on the 1 series? They are huge and 6 piston I think, cant imaging you need much more brake than that. Pads, fluid and SS lines I could see, I don't imagine we need much bigger brakes though.

[The Wind Breezes]

Power mods are already very well documented here. You basically have 3 competing criteria, budget power and reliability. As for the rest, either car will go fast enough bone stock to make "handling" entirely up to the driver unless both of you are employed as professional drivers.

[mfindigital]

The one killer is the price of the bmw oil cooler. I'm surprised how few aftermarket options there are, , at least that I know of. n54's and n55's have to be one of the most modded platforms available at the moment. This ER kit does have me intrigued:
https://x-ph.com/er-sports-series-oil-cooler-n54-n55/

[mfindigital]

Oh, and here are some SS brake lines, I'll be buying these at some point before the end of summer:
http://www.burgertuning.com/Stainles...s_BMW_135.html