[DKX4///M]

I hooked up my JB$ today and played with it for hrs...map 1 on pump gas is fun for short burst but it misses over 5500rpms especially after more than a few secs...Once you REALLY get your octance to 105AKI+ WOW....Still a miss here and there but thinking maybe pull the plugs and narrow the gaps. Guessing stock there somewhat conservative.

Today was hot and im on stock FMIC ( not for long) but the few runs you get before Heat Soak holy...I also have a BEF from ENZO that I THINK made the DME adaptive to the fuel over 91. BC on map0 amd 4 It was HOLDING 20 PSI until the engine started missing from the heat...

I think once I do my FMIC, piping and C02+water sprayers 22 will make serious power...Coordinated water, Co2, water, Co2, etc literally covers the FMIC with a sheet of ice and the intake charge actually DROPS close to ambient temps. Lower on a cool day.

Map 6, which I believe targets 18 is good in higher gears but the over boost feature still hits and temporarily puts it back at 22 aka misfires...

On this hot day and prolonged WOT 17-18 was the sweet spot...

I also dont know what Enzo did exactly, I didnt hook up my EWG wires yet or update firmware and it was over 90*...Mods are BMS Intake, VRSF DP, 110 AKI (Today) JP4 / FF add on, Enzo Performance BEF. VRSF Charge Pipes go on tomm.

Also important note, sounded like the diverter valve was leaking over 21psi...Ive had a few turbo cars and its a distinct sound ive heard before, guessing its cheap plastic.

Can we intstall a blow off valve and just re-circulate like on my evo 8?

[mike@x-ph.com]

Originally Posted by DKM3Power

I hooked up my JB$ today and played with it for hrs...map 1 on pump gas is fun for short burst but it misses over 5500rpms especially after more than a few secs...Once you REALLY get your octance to 105AKI+ WOW....

Today was hot and im on stock FMIC ( not for long) but the few runs you get before Heat Soak holy...I also have a BEF from ENZO that I THINK made the DME adaptive to the fuel over 91. BC on map0 amd 4 It was HOLDING 20 PSI until the engine started missing from the heat...

I think once I do my FMIC, piping and C02+water sprayers 22 will make serious power...

Map 6, which I believe targets 18 is good in higher gears but the over boost feature still hits and temporarily puts it back at 22 aka misfires...

On this hot day and prolonged WOT 17-18 was the sweet spot...

I also dont know what Enzo did exactly, I didnt hook up my EWG wires yet or update firmware and it was over 90*...Mods are BMS Intake, VRSF DP, 110 AKI (Today) JP4 / FF add on, Enzo Performance BEF. VRSF Charge Pipes go on tomm.

Also important note, sounded like the diverter valve was leaking over 21psi...Ive had a few turbo cars and its a distinct sound ive heard before, guessing its cheap plastic.

Can we intstall a blow off valve and just re-circulate on my evo 8?

You definitely need an upgraded intercooler with the mods that you already have on

I recommend you install the EWG wires since you are running catless DP with the JB4

Are you sure its the diverter valves and not a broken OE charge pipe?

Glad you like the JB4

Next should be upgraded charge pipe and intercooler

[DKX4///M]

Originally Posted by mike@x-ph.com

You definitely need an upgraded intercooler with the mods that you already have on

I recommend you install the EWG wires since you are running catless DP with the JB4

Are you sure its the diverter valves and not a broken OE charge pipe?

Glad you like the JB4

Next should be upgraded charge pipe and intercooler

Im the one who bought the VRSF Charge Pipes from you last week, and discussed FMIC Options and pricing via email.

But yea, It was a "flutter" that came with a sudden and inconsistant FAST drop in boost, followed by a rise right back up. Then car was fine....I think if the OE charge pipe failed I would've had to fix it on the side of the road or limp home

...Stock Mitsu Evo 8 charge pipe was a NIGHTMAREEEE. And the plastic BOV...I got a Turbo XS and piped it back in to recirculate...I wonder if we can do that on these cars?

[mike@x-ph.com]

Originally Posted by DKM3Power

Im the one who bought the VRSF Charge Pipes from you last week, and discussed FMIC Options and pricing via email.

But yea, It was a "flutter" that came with a sudden and inconsistant FAST drop in boost, followed by a rise right back up. Then car was fine....I think if the OE charge pipe failed I would've had to fix it on the side of the road or limp home

...Stock Mitsu Evo 8 charge pipe was a NIGHTMAREEEE. And the plastic BOV...I got a Turbo XS and piped it back in to recirculate...I wonder if we can do that on these cars?

Not sure if it can be done on BMW, this is the first time i hear about DV failing on this car

[DKX4///M]

Built Japanese and American cars my whole life...BC for A while was a reg tech I HATED all German cars and swore Id never buy one...but i loved the e92 m3 so much...

I honestly need to look at it see here is was comin from....I have an idea, and since Im taking the panels off to do the charge pipe, ill easily find the week point...I dont know this platform...If the BOV is manually controlled by a vaccum line it had to be that. if bov is electronically controlled then its the annoying dme...Ill find out now...

[FSociety]

Bad news; after heavy data logging since May ; exchanging emails with Terry ; Dyno'ing on different octane levels and boost safety + about 7 drag-strip visits already.

Bad news is, he was right its just an aggressive tuned N55 with better internals to handle allow the extra power. I highly highly urge anyone to get it Custom Dyno Tuned because JB4 Map5 (Auto-Tune) doesnt work on this new revised engine and map7 is not so good at the higher rpms and holding 18.5 boost (Looks like the turbo is just blowing hot air on the higher boost maps)

Those with downpipes and other bolt-ons will most likely have better lucky with map6/7 of course. Those who are interested in jb4 or have one from a m235 and want to transfer it over it'll work like in my case, engine craves octane badly (e30 blend will do wonders).

I plan on working with a Backend Flash and def recommend if you want to try map6 work with a tuner who will put you on a live dyno, i also dont really turn jb4 on if weather is 85F+. From terry we should stick to map2 with e30 blend for best combo.

[zenmaster]

Originally Posted by FSociety

Bad news is, he was right its just an aggressive tuned N55 with better internals to handle allow the extra power.

I believed him when he originally dyno'd stock 91oct it while measuring the temps. It's obvious that BMW is running the turbo outside of its efficiency range in overboost. Looks like a little more room for 1-2psi more with 93.
I'm wondering what a JB+ will dyno with 93oct? 345whp?

[J.M]

So, basically, for now jb4 is not really a good option?

[zenmaster]

Originally Posted by J.M

So, basically, for now jb4 is not really a good option?

If no mods and on pump gas prob not. But Terry already said as much. It'll prob never be a good option for that purpose.

[J.M]

If fully modded then I suppose a custom remap is also a better option for all reasons.

[Bee Pee]

Originally Posted by J.M

If fully modded then I suppose a custom remap is also a better option for all reasons.

Or jb4 map 6 fettled by someone who knows what they're doing

[FSociety]

Originally Posted by zenmaster

I believed him when he originally dyno'd stock 91oct it while measuring the temps. It's obvious that BMW is running the turbo outside of its efficiency range in overboost. Looks like a little more room for 1-2psi more with 93.
I'm wondering what a JB+ will dyno with 93oct? 345whp?

345whp its pretty much stock
you wont see more than 380-390whp without downpipes & e85
my car at least gains more torque than WHP so you will def be 430-460wtq
I'm sure the m2 with less drivetrain less / rwd , will put 400-430whp dont know about torque yet barely any data out there

Originally Posted by J.M

So, basically, for now jb4 is not really a good option?

expensive option and correct i havent seen much M2 guys on the n54tech forums either they went Upgraded Turbos & Port Injection but still the jb4 alone needs a backend flash badly to smoothen the power band and stuff.

Originally Posted by zenmaster

If no mods and on pump gas prob not. But Terry already said as much. It'll prob never be a good option for that purpose.

Correct, map1 the most u can do on 93 pump gas no mods on M2, Terry said not even 91 is recommend for map1 lol

Originally Posted by Bee Pee

Or jb4 map 6 fettled by someone who knows what they're doing

BEF/JB4 will do good for Map6

Originally Posted by J.M

If fully modded then I suppose a custom remap is also a better option for all reasons.

Custom Remap 100% is going to be way until there's more time spent understanding the ECU tuning thats in place at the M2 stock levels

[zenmaster]

Originally Posted by FSociety

i havent seen much M2 guys on the n54tech forums either they went Upgraded Turbos & Port Injection but still the jb4 alone needs a backend flash badly to smoothen the power band and stuff.

What are the effective limits of the M2's stock, but larger injectors vs say an M235i?

[FSociety]

Originally Posted by zenmaster

What are the effective limits of the M2's stock, but larger injectors vs say an M235i?

Good question for Terry, ActiveAutowerke8 who had/have M2 in their testing.

But to sum it all up, "No M2 specific updates have been needed, yet. They run strong on map1 on pump gas, and map2 with E30 mixed in. Beyond that you run out of turbo and fuel pressure"

^^^ same thing I've proven with my tank and badly needs a Real Custom Tune

This is what Terry has said in http://www.n54tech.com/forums/showthread.php?t=38826

[Bee Pee]

Originally Posted by FSociety

BEF/JB4 will do good for Map6

Custom Remap 100% is going to be way until there's more time spent understanding the ECU tuning thats in place at the M2 stock levels

Why the need for BEF with map 6 ? Is it to dial out the resident overboost feature so jb4 absolute control is more like regular n55's ?

If going BEF then you may as well have pucker remap for m2 and then optionally use jb4 for monitoring / logging in map 4.

I think the best solution for m2 - if getting ECU encryption bypassed - is either hex tuning or bootmod3 and ditch jb4 all together.....

BP

[FSociety]

Originally Posted by Bee Pee

Why the need for BEF with map 6 ? Is it to dial out the resident overboost feature so jb4 absolute control is more like regular n55's ?

If going BEF then you may as well have pucker remap for m2 and then optionally use jb4 for monitoring / logging in map 4.

I think the best solution for m2 - if getting ECU encryption bypassed - is either hex tuning or bootmod3 and ditch jb4 all together.....

BP

Complicated situation right now, there's not enough research or studies with the M2 / X4 M40i engine. So can't say I understand exactly, but one thing for sure is while on Map4 i see boost go from 13-15, I know the M2 does 14-16 not sure how much the overboost is since X4 M40 doesn't have the overboost.

I haven't seen any remap for m2 yet, I was thinking the BEF will open the map6 for JB4 a bit better and from all the cars that are running BEF/JB4 its much better in power curve than jb4 alone.

Hex Tuning announced an N55 tune ?
with proTUNING Freaks BM3 aka GameChanger def a clear winner for anyone who currently doesn't have JB4.

I'll prob run BM3 BEF + JB4 for a while then, JB4 map0 and do a BM3 Full Flash and see how they compare

More data more better right

[Bee Pee]

Yup- more good info - better choices/ decisions.

As X4 m40i doesn't have overboost facility as per m2 - must make x4 a better proposition as far as jb4 is concerned as am to understand the o/boost logic is a right royal fecker to workaround.

I reckon a decent dyno session to setup yr map 6 with some high grade gas might net you some good stable error free gains.

Fyi I was running shell v power (98 RON here in UK) with 200cpi DP and was seeing some healthy correlation between target and actual boost peaking 15.5psi. Map6 dyno netted me 397/470 crank power and torque with 375+ bhp from 4500-7000rpm and 400+torque from 2000-5000rpm. Charged to Tesco momentum 99 (99+ RON here in UK) and saw solid 1-1.5psi gain across the full rev range.

[Anthony235]

Originally Posted by 135iDCT

u hit 347whp stock then 355whp for map1(pump gas93), how the hell u can feel the difference of only 8whp gain!!

like i said on race gas or meth u will feel the difference.

Maybe it's the 40 extra TQ?

[Anthony235]

Originally Posted by zenmaster

What are the effective limits of the M2's stock, but larger injectors vs say an M235i?

M2 and M235 have the same fuel injectors, FPH pump, FPL pump, fuel rail. I've already checked.

My theory is BMW used the same fuel hardware, but used DME tuning to push it closer to the fuel hardware limit while adding slightly different timing and a richer AFR at redline. Which means the m2 has less headroom to run ethonal and the other Jb4 maps. This is from my experience so far.

[Bee Pee]

Anthony

Makes sense.

Can't understand why some folks are using jb4 absolute maps, with high boost targets, wo EWG harness hooked up so as JB4 controls boost directly.

Map 5 autotune and map 7 will have boost regulated by DME wo EWG harness. Add in BEF makes the sitiation worse IMHO even if logging map 4, wo EWG harness.

M2 overboost maybe hindering p/backs but if x4 m40i does wo overboost should be a more stable starting point than m2. Ewg harness map 4 to see / understand what DME is doing then endeavour to setup map 6 to squeeze more safely given DME is already close to fuelling limits......

BP

[Anthony235]

Originally Posted by Bee Pee

Anthony

Makes sense.

Can't understand why some folks are using jb4 absolute maps, with high boost targets, wo EWG harness hooked up so as JB4 controls boost directly.

Map 5 autotune and map 7 will have boost regulated by DME wo EWG harness. Add in BEF makes the sitiation worse IMHO even if logging map 4, wo EWG harness.

M2 overboost maybe hindering p/backs but if x4 m40i does wo overboost should be a more stable starting point than m2. Ewg harness map 4 to see / understand what DME is doing then endeavour to setup map 6 to squeeze more safely given DME is already close to fuelling limits......

BP

If it was possible, and I owned a M2, my choice would be to disable the M2 overboost feature completely.

[zenmaster]

Originally Posted by Anthony235

M2 and M235 have the same fuel injectors, FPH pump, FPL pump, fuel rail. I've already checked.

Thanks, just assumed based on someone's post (http://f87.bimmerpost.com/forums/sho...23&postcount=3). Yes, exactly the same system:
http://de.bmwfans.info/parts-catalog...ne/#7639994_10
http://de.bmwfans.info/parts-catalog...injector_line/