[O Haiii]

Hey fellas,

Been a long time lurker, finally about to pull the trigger on a LCI 6mt. I am not new to the tuning world, but new to turbo BMWs. Previously owned 2 race-prepped S2000s, 370Z (garbage), and tracked a buddy's E92 M3 6mt from time to time. The overwhelming reviews of the M2 finally broke me haha.

I'm seeing that ecu mods (jb4 for instance) don't benefit the M2 as well as the regular 335 /340s. It seems like 335 / 340 crowd sees crazy (unheard of in the NA world) gains while the M2 sees mild increase in power. Given that they are both using N55 engine (few different internals on m2), what explains this discrepancy? Obviously im set on the M2 but was curious on why this is.

Thanks for all ur help!

[SeanWRT]

Welcome to the club

A simple put:
M2 has basically a stronger and cooler N55 that is tuned from factory to a higher power state, or maxed out as some like to say. You can say BMW has done most of aftermarket jobs.

There is little left on the table with stock hardwares. You won't be seeing meaningful gains until upgrading downpipe and intercooler.

Hope it helps.

[mike@x-ph.com]

It is the same engine but the M2 is tuned more aggressively which leaves little room for more boost on stock cars

[Dav3]

Fuel pump is also another major constraint

[zenmaster]

Originally Posted by lopm2

Fuel pump is also another major constraint

We've seen it good for +100whp over stock on 93oct, and even then a new turbo had to be used. So lots of margin in that Dept.

[DragonGate]

Originally Posted by O Haiii

Hey fellas,

Been a long time lurker, finally about to pull the trigger on a LCI 6mt. I am not new to the tuning world, but new to turbo BMWs. Previously owned 2 race-prepped S2000s, 370Z (garbage), and tracked a buddy's E92 M3 6mt from time to time. The overwhelming reviews of the M2 finally broke me haha.

I'm seeing that ecu mods (jb4 for instance) don't benefit the M2 as well as the regular 335 /340s. It seems like 335 / 340 crowd sees crazy (unheard of in the NA world) gains while the M2 sees mild increase in power. Given that they are both using N55 engine (few different internals on m2), what explains this discrepancy? Obviously im set on the M2 but was curious on why this is.

Thanks for all ur help!

You're indeed correct, don't even bother with JB4
- There's big development going on with ProTuningFreaks who brought out Tuning Platform named BOOTMOD3. If you want to tune or improve, this is the way to go.
- Like Sean mentioned, enjoy the stock power, and then if you want more start with cooling first such as Intercooler and Downpipes.

Originally Posted by SeanWRT

Welcome to the club

A simple put:
M2 has basically a stronger and cooler N55 that is tuned from factory to a higher power state, or maxed out as some like to say. You can say BMW has done most of aftermarket jobs.

There is little left on the table with stock hardwares. You won't be seeing meaningful gains until upgrading downpipe and intercooler.

Hope it helps.

Well said

Originally Posted by mike@x-ph.com

It is the same engine but the M2 is tuned more aggressively which leaves little room for more boost on stock cars

Can Vendors please stay out of some Support Threads? Boost is not the only way to tune and especially the reason of failure from most JB4 users & Tuners thinking raising boost is enough.

Originally Posted by zenmaster

We've seen it good for +100whp over stock on 93oct, and even then a new turbo had to be used. So lots of margin in that Dept.

100whp on stock turbo + 93 oct impossible
But we've seen it with Meth or Port Injection E85

[zenmaster]

Originally Posted by Gong

100whp on stock turbo + 93 oct impossible
But we've seen it with Meth or Port Injection E85

No one said 100whp on stock turbo was possible.

[FSociety]

Originally Posted by zenmaster

No one said 100whp on stock turbo was possible.

It is possible with Meth or E85/PI on stock turbo and so it is possible with Upgraded Turbo on 93 too.

[O Haiii]

got it. Thanks guys for the info!

[Fabspeed Motorsport]

The best way to boost up the power a little bit, add a nice little sound to the car, and just overall have some more fun in your M2 is to go with a catted downpipe - especially our Sport Cat. There is no doubt in my mind that it is the best first/overall modification you can do to your M235/335/435/M2. There are plenty of threads to back that up as well.

If you have any questions, feel free to reach out and I would be happy to help!

[TT1351]

My 08 135i with intercooler, down pipe, chargepipe and JB4 actually honks. I need to see how my M2 PE runs against it. So far the 135i seems crazy fast compared to the stock M2. Just sayin!

[Motivate]

How much HP does the JB4 gain for the M2? Their website shows 60hp to 100hp at the wheels for the F series cars, not sure about specific numbers for M2.

[stefan]

I'd be surprised to see any more than 25 whp out of a stage 1 ots tune. Seems like dp and fmic is the way to go bang for r buck until you start talking turbo.

[TuningTech FS]

The M2 is very fun for someone who is track focused like you. I would encourage you to try it on stock form before worrying about tune and power options. If you been lurking you know the M2's capability with FBO.