[AmuroRay]

Originally Posted by The_otherM235i

What i'm most pissed about is the fact that a FBO M235i on perfect conditions can't even put down 400 wheel.

This is false.

[The_otherM235i]

Originally Posted by RandomBMW

Stage 2 w/ E30, downpipe, intercooler, charge pipe.

You can get close running 91 octane, though.

https://www.2addicts.com/forums/showthread.php?t=1490691

Of course, I am not there...yet. When I get my parts, I hope to do a Stage 2 E30 dyno run to confirm.

I run 94 and will probably get a custom tune on the dyno to see if I can really squeeze the power out of my N55. I'd like to hit 400 wheel with stock Turbo but we'll see what happens

[123Britt]

WOW! 400 WHP is a lot.


I would simply like to see about 350-360ish at the wheels and maintain that smooth progressive OEM power.

Actually, my plan is to only run :

BM3 Stage 0+
VRSF CP
VRSF 5" HD I/C
BMC Panel Filter.

Think that will get me to 350 at wheel?

[XutvJet]

Originally Posted by The_otherM235i

What i'm most pissed about is the fact that a FBO M235i on perfect conditions can't even put down 400 wheel.

Not true, but 400whp is pushing the limits of the factory fueling system. Simply upgrade the HPFP and 400+whp is easy and been numerous times on the EWG stock turbo N55. Add some ethanol or methanol and it's even easier.

Personally, I think it's silly though. If you want 400whp+, get a used M2C/M3/M4. The S55 is designed for that level of power and has all the necessary fueling and cooling capacity needed.

380-400whp/420-450wtq in a 3,500lb M235 would outrun most other more standard naturally aspirated sport coupes (Mustang GT, Camaro SS, Charger/Challenger). The uninformed tend to look at just the peak numbers. They don't understand that power under the curve is the true factor in dictating acceleration. A FBO EWG N55 has a very wide and thick powerband compared to something like a late model Mustang 5.0. The average power across the powerband is impressive. It's why a 330whp/360wtq N55 M2 is capable of 12.5-12.7@110-112mph in stock form.

[Heitzer]

Originally Posted by 123Britt

WOW! 400 WHP is a lot.
I would simply like to see about 350-360ish at the wheels and maintain that smooth progressive OEM power.

Actually, my plan is to only run :

BM3 Stage 0+
VRSF CP
VRSF 5" HD I/C
BMC Panel Filter.
Think that will get me to 350 at wheel?

Like your plan. I am looking to do the same - adding a VRSF CP, cold plugs and a stage 0+ map

I also wouldn't mind a "tuned" M2 Stage 0+ map adding more boost at the high end, let's say after 4000rpm. Anybody seen such a map? It would basically add what stage 2 does but only at high rpm. Can you even do that - safely?

Sorry for hijacking the thread.

[AmuroRay]

Originally Posted by Heitzer

Like your plan. I am looking to do the same - adding a VRSF CP, cold plugs and a stage 0+ map

I also wouldn't mind a "tuned" M2 Stage 0+ map adding more boost at the high end, let's say after 4000rpm. Anybody seen such a map? It would basically add what stage 2 does but only at high rpm. Can you even do that - safely?

Sorry for hijacking the thread.

You might have to go custom. But the M2 tune is likely as aggressive as you can go on a stick down pipe anyhow.

[OldCrow7xx]

Originally Posted by The_otherM235i

What i'm most pissed about is the fact that a FBO M235i on perfect conditions can't even put down 400 wheel.

Should have given us a better turbo for a 55,000 dollar car...

Building my own setups the rest of my life once I learn ignition timing, air fuel and boost tables to do it...

[OldCrow7xx]

Originally Posted by Heitzer

Like your plan. I am looking to do the same - adding a VRSF CP, cold plugs and a stage 0+ map

I also wouldn't mind a "tuned" M2 Stage 0+ map adding more boost at the high end, let's say after 4000rpm. Anybody seen such a map? It would basically add what stage 2 does but only at high rpm. Can you even do that - safely?

Sorry for hijacking the thread.

In theory (I am still learning) you could probably do this on the map editor. Transform the Stage 0 map to Stage 0+ map, and then make your tweaks top end.

I feel like pushing heavy boost at the highest RPMs should be fine for how little time ( like seconds or minutes per year) the car spends at the very top of the rev range...guess this could be subjective as to what is "dangerous" or "risky".

I actually really like the Stage 0+ map and didn't see a big difference adding a downpipe, IC and Stage 2.

I opened the map editor earlier thinking I was ready to start tuning but there are so many tables for the same concept, IE boost, timing, lambda etc.

I thought it was just like "the boost table" and "the ignition timing table" and the "air fuel table" etc. not a family of interconnected and related sub tables.

[Heitzer]

Originally Posted by AmuroRay

You might have to go custom. But the M2 tune is likely as aggressive as you can go on a stick down pipe anyhow.

Good advice AmuroRay. I checked the f30 and f80 forums including what you had posted there. Looks like the 0+ map is the right choice for me.

I wonder though if there are other things that can be tuned separate from torque curves. I know this from motorcycle tuning where environmental regulations make it hard for manufacturers to create smooth on and off throttle response for example. Tuning helps a lot with things other than power. Is driveability and throttle response worth getting a tune for? Or is this already baked into all BM3 off the shelf maps? Just wondering...

[AmuroRay]

Originally Posted by Heitzer

Good advice AmuroRay. I checked the f30 and f80 forums including what you had posted there. Looks like the 0+ map is the right choice for me.

I wonder though if there are other things that can be tuned separate from torque curves. I know this from motorcycle tuning where environmental regulations make it hard for manufacturers to create smooth on and off throttle response for example. Tuning helps a lot with things other than power. Is driveability and throttle response worth getting a tune for? Or is this already baked into all BM3 off the shelf maps? Just wondering...

I don't have BM3, but there are a few mods that have been reported to increase throttle response and decrease lag, including the DiverterValve Plus (DV+) OR Turbosmart Plumbback Diverter Valve, and a intake inlet like the Pure unit or MST Hybrid Inlet.


They may free up some power, but most people report the benefits I listed above, and they should provide extra headroom for a custom tune.