[Mcf51]

A couple weeks ago I drove a M340i. It was fun. Put it in sport mode and even with traction control on it was spin the tires and torque was great off the line. No noticeable turbo lag. Today drove a 2021 M3 comp. Both autos. Going from 20mph and up the car was crazy. From a stop it just wasn’t there. Severe lag up to about 10mph. I put it in M mode. Was it possible there was another setting I needed to put it in? The torque from stand still was much less than the m340 I and a 2017 911. All auto. The M3 is the most powerful but least aggressive off the line. The 340i and 911 both had a physical sport button. I assumed the M button on the m3 was the same. Does the g80 have a sport option to keep the turbos spinning at idle (like a waste gate valve or something). Wanted to love the car but I need some push agains the seat feeling from a dead stop. Thanks.

[ksa]

In addition to the properly set-up M mode, you also need to put the car in 'Sport' mode out of the 3 drive settings. I can assure you if you thought m340 was fun, the M3 Comp will not feel how you describe.

[Trojan4evr]

Yeah, M mode doesn't really mean M mode. It just changes the cluster gauge set up and the lane change assist intervention. You have to push the set up button to change to sport/sport+ on the engine, dampers, and the transmission.

['Cane]

Go back and drive it again, press the M2 button twice and see what the difference is.

[somer]

It's a low compression motor with big turbos, there's only so much you can do before they spool. Also traction control on the RWD models is fairly aggressive off rip.

[Forzanerazzurri]

Ya you didn't have it in the right setting. A comp xdrive in sport+ in launch control will make the blood rush out of your head. An m340i isn't comparable at all.

['Cane]

Originally Posted by Forzanerazzurri

Ya you didn't have it in the right setting. A comp xdrive in sport+ in launch control will make the blood rush out of your head. An m340i isn't comparable at all.

He drove a 2021, so it was RWD. Still, should have been a better experience.

[Forzanerazzurri]

Originally Posted by 'Cane

He drove a 2021, so it was RWD. Still, should have been a better experience.

Right. Thanks for clarifying.

[JDUNITNOW]

Buy a Hell Cat... you are looking at the wrong car. I have a RWD m3 and never had anyone ride with me and say it's not fast enough.

[/ / / M3]

Originally Posted by Mcf51

A couple weeks ago I drove a M340i. It was fun. Put it in sport mode and even with traction control on it was spin the tires and torque was great off the line. No noticeable turbo lag. Today drove a 2021 M3 comp. Both autos. Going from 20mph and up the car was crazy. From a stop it just wasn’t there. Severe lag up to about 10mph. I put it in M mode. Was it possible there was another setting I needed to put it in? The torque from stand still was much less than the m340 I and a 2017 911. All auto. The M3 is the most powerful but least aggressive off the line. The 340i and 911 both had a physical sport button. I assumed the M button on the m3 was the same. Does the g80 have a sport option to keep the turbos spinning at idle (like a waste gate valve or something). Wanted to love the car but I need some push agains the seat feeling from a dead stop. Thanks.

The M340i has more torque at very low rpm because of how the engine is tuned. However, the M3 Comp should not feel laggy or sluggish off the line by any means. And it should feel a lot more powerful than a 2017 911 at any rpm. My guess is that you had the engine in the "efficient" mode, which is the default setting when you start the car.

[turbojg]

You cannot drive a turbocharged car the same way you would a normal aspirated engine car. Turbocharged engines generally have lower compression ratios so that more boost pressure can be run. Generally the higher the boost pressure being run the lower the compression ratio. That makes the lower compression turbocharged car even lazier from a dead stop (or at low RPMs) until the turbos spool up and start producing boost. One way to run a higher compression ratio with a turbocharger is to run higher octane fuels such as racing fuel. But that has it's costs.

That is why the M cars have launch control which loads the engine up against the torque converter so the turbos are producing boost and the engine is in the torque producing RPM range the instant the brakes are released.

Another side disadvantage of lower compression is less engine braking when downshifting. There are always compromises. The correct setup depends on what your priorities are.

[forcefed]

Originally Posted by Mcf51

From a stop it just wasn’t there. Severe lag up to about 10mph.

M340i small turbo + high compression = instant throttle response/good top end
M3 big turbos + low compression = slow throttle response/crazy top end

[harperium]

The nature of the B58 turbo is that it is a twin-scroll. This means it has TWO fans. A small one, that spools up quickly giving you low RPM power, and a big one, that spools up more slowly, giving you power at high RPMs. Both fans feed all 6 cylinders.

The S58 has two single-scroll turbos. They are both large fans that spin up slowly, so there is less boost at low RPMs, but a lot of boost at high RPMs. Also, each turbo feeds 3 cylinders, so there is more boost all around.

The S63 and S68 have two twin-scroll turbos... that's why the M5 and M8 are so good at low RPMs...

[Mike02z]

Originally Posted by JDUNITNOW

Buy a Hell Cat... you are looking at the wrong car. I have a RWD m3 and never had anyone ride with me and say it's not fast enough.

As someone who has had 2 hellcats I can say they are fast but on street tires they were useless from a dig trying to get traction. 707 HP is great but you need to get it to the ground. Something the Hellcat did poorly unless on drag radials or slicks.

If you have a Hellcat the fun part is roll racing like me and my son did back in 2018 my son won the below race as I missed 5th

https://youtu.be/YABHt3Ke2yk?si=kOjk5x_nl_72yXwM

[TopJimmy]

Once you know what to set…then you’ll know.

His rank is 0 guys…don’t beat him up toooo much.

[M4Lou]

Originally Posted by TopJimmy

Once you know what to set…then you’ll know.

His rank is 0 guys…don’t beat him up toooo much.

lol - yes. That and negative comment, I just figured it's a troll deal.

[MT6]

Engine setting must be in Sports + mode, if not change it to and than drive hard

[ChrisM4]

Try with the following settings:
Engine: Sport plus
Transmission: S3
DSC: off
Chassis 4WD
Suspension: Comfort

Stomp the brakes, push the throttle hard to the floor, launch control will prep, side step the brake and you’ll rocket off the line. If you’re in an X-drive version you’ll do 0-60 in ~3.0 seconds and a low 11 second quarter at 122-124mph.

[robopp]

Originally Posted by harperium

The nature of the B58 turbo is that it is a twin-scroll. This means it has TWO fans. A small one, that spools up quickly giving you low RPM power, and a big one, that spools up more slowly, giving you power at high RPMs. Both fans feed all 6 cylinders.

The S58 has two single-scroll turbos. They are both large fans that spin up slowly, so there is less boost at low RPMs, but a lot of boost at high RPMs. Also, each turbo feeds 3 cylinders, so there is more boost all around.

The S63 and S68 have two twin-scroll turbos... that's why the M5 and M8 are so good at low RPMs...

Uh, that’s not how twin-scroll works at all. There’s a single compressor and turbine fan on any turbo regardless of single or twin-scroll. The difference is that in a twin scroll, the exhaust gases are divided into two separate paths into the single turbine wheel. Therefore, you can’t have two twin scroll turbos on a I/V6.

https://www.motortrend.com/how-to/mo...system-design/

[SwankPeRFection]

Originally Posted by harperium

The nature of the B58 turbo is that it is a twin-scroll. This means it has TWO fans. A small one, that spools up quickly giving you low RPM power, and a big one, that spools up more slowly, giving you power at high RPMs. Both fans feed all 6 cylinders.

The S58 has two single-scroll turbos. They are both large fans that spin up slowly, so there is less boost at low RPMs, but a lot of boost at high RPMs. Also, each turbo feeds 3 cylinders, so there is more boost all around.

The S63 and S68 have two twin-scroll turbos... that's why the M5 and M8 are so good at low RPMs...

To add some more info to the previous post that corrected this, the idea behind a twin scroll exhaust housing is that you’re actually taking each exhaust port for each cylinder and plumbing them into a “stacking” order in each side of the scroll so that the exhaust gasses do not collide with each other in the housing and actually work in a compounding way so that as one pulse pushes the next one comes along and pushes without running into any introduced restriction from another one in the firing order. They fit in kind if like a zipper if you wanna visualize it. It improves spool time by a little bit due to this added efficiency. Depending on your application, you’d pick either twin scroll or single. A lot of I6 guys just run a single vband based housing to their turbo because of ease of install and clocking where the room might be tight, but the really nice street setups for like a 2JZ is a good sized turbo that flows well up top with a modest twin scroll exhaust housing to help spool down low.

[Mcf51]

Thanks everyone for the responses. I guess my question is, is a rwd automatic ‘capable’ of smoking the rear tires from a stand still by just punching the gas? Not that I want to do this often but maybe occasional I just want to blow off some steam!! If so, what settings would permit this type of juvenile (lol) behavior. Thanks!!!

[Race_Doc11]

Go get 340i