[Dave92N54]

Originally Posted by Gregrobin

Thanks, should I go back from MHD Stage 1+ to 1 until I get these resolved?

Not a real need to do so but if you'd like, can't hurt. If you do so, I believe MHD has the kickdown delete option so go ahead and flash that, and I would try to get another log locked in 3rd gear just to be sure but likely you just need a new LPFP. When mine went out I just went with a new OEM unit, they handle up to E30 and it was a super easy install.

[ab987]

Originally Posted by Gregrobin

Mine is a 2008 E93 with MHD Stage 1+

Is everyone saying my numbers are good, no wastegate, LPFP issue?

And that the odd data logged is a result of kickdown?

Sorry I was referring to the fellow's log at 29psi on stock turbos. Nothing weird about the kickdown, it just has super low load and doesn't build much boost while it's kicking down and makes it look like it took 2000rpm to spool when in reality it was probably more like 500

[Gregrobin]

Originally Posted by Dave92N54

Not a real need to do so but if you'd like, can't hurt. If you do so, I believe MHD has the kickdown delete option so go ahead and flash that, and I would try to get another log locked in 3rd gear just to be sure but likely you just need a new LPFP. When mine went out I just went with a new OEM unit, they handle up to E30 and it was a super easy install.

All the ones I am finding online include the sending unit. I don't need a sending unit and would prefer to not install one. Do I have to do this at the same time? Or can I disconnect the sending unit on the new one? It's not clear to me if the sending unit is "hard wired" to the LPFP or not.

[Dave92N54]

Originally Posted by Gregrobin

All the ones I am finding online include the sending unit. I don't need a sending unit and would prefer to not install one. Do I have to do this at the same time? Or can I disconnect the sending unit on the new one? It's not clear to me if the sending unit is "hard wired" to the LPFP or not.

I don't believe they are, but if you're interested in doing something like that, DIYing a Walbro 450 will likely be your best option. At that point you'd be able to handle up to E50 (which I believe is where the HPFP runs out of fueling) Not much point in hacking up the stock bucket just to install a stock pump. If you're like me and often bring your gas level down to 1/4 or less, i'd recommend against a bucketless setup. Many here will say it's fine since it's only really an issue if you're tracking the car and doing lots of cornering but better safe than sorry imo.

[Gregrobin]

Originally Posted by Dave92N54

I don't believe they are, but if you're interested in doing something like that, DIYing a Walbro 450 will likely be your best option. At that point you'd be able to handle up to E50 (which I believe is where the HPFP runs out of fueling) Not much point in hacking up the stock bucket just to install a stock pump. If you're like me and often bring your gas level down to 1/4 or less, i'd recommend against a bucketless setup. Many here will say it's fine since it's only really an issue if you're tracking the car and doing lots of cornering but better safe than sorry imo.

I am looking for an "as OEM as possible" solution tat addresses the issue and gives me the option to go to MHD stage 2, no higher. I don't plan to race, drag, scream, do meth (maybe a little weed though), E85, kick, fight, etc...

[Dave92N54]

Originally Posted by Gregrobin

I am looking for an "as OEM as possible" solution tat addresses the issue and gives me the option to go to MHD stage 2, no higher. I don't plan to race, drag, scream, do meth (maybe a little weed though), E85, kick, fight, etc...

Gotcha, in that case i'm not too sure. Someone else may have a proper answer for you. I know I went with a new OEM unit just to skip the hassle bc I knew I likely won't even try anything past E30 because of how ethanol loves to degrade our injectors.

[Saif2018]

Originally Posted by Gregrobin

I am looking for an "as OEM as possible" solution tat addresses the issue and gives me the option to go to MHD stage 2, no higher. I don't plan to race, drag, scream, do meth (maybe a little weed though), E85, kick, fight, etc...

If you don't want to run Ethanol, OEM should good enough.

[RSL]

Originally Posted by Dave92N54

RSL back to make us all look stupid again

Guess this is the last time I skip looking at gear

Nah, just to help. Things have to go on for a while before I feel compelled to log in and offer my $0.02 though lol

Originally Posted by ab987

I thought so on the torque actual value. But that value did seem pretty accurate on that log up above given the 100-200 time, it was around the same as mine and I bet it wasn't an e93. And if it can be set anywhere, wouldn't a tune have to manually set it for it to be inaccurate? Doesn't the DME calculate and update it every x ms? Sorry for dragging this on, just my software engineer side coming out and it sounds like you might know what's actually going on here

BMW may have mapped it out reasonably well above stock levels, but it would've been done with the all things stock for those levels, which no one keeps. Change AFR or any of the factors that effect it and it's altered.

Chances are, any tuned N54 at almost any level will actually produce 525-625nm range and torque actual will generally be in that range, either by default or on purpose. Stock AT has to be limited to around 600nm max reported to avoid limiters and issues. Even MHD OTS maps ask which trans before flashing, there's a reason. Either way, reported and actual output values will generally be close out of coincidence or necessity, especially on canned tunes.

Torque actual is completely detached from actual output though and can't be used as a measure. As an example, here's a log I did a long time ago, make an estimate of the actual power.

[ab987]

Originally Posted by RSL

Nah, just to help. Things have to go on for a while before I feel compelled to log in and offer my $0.02 though lol


BMW may have mapped it out reasonably well above stock levels, but it would've been done with the all things stock for those levels, which no one keeps. Change AFR or any of the factors that effect it and it's altered.

Chances are, any tuned N54 at almost any level will actually produce 525-625nm range and torque actual will generally be in that range, either by default or on purpose. Stock AT has to be limited to around 600nm max reported to avoid limiters and issues. Even MHD OTS maps ask which trans before flashing, there's a reason. Either way, reported and actual output values will generally be close out of coincidence or necessity, especially on canned tunes.

Torque actual is completely detached from actual output though and can't be used as a measure. As an example, here's a log I did a long time ago, make an estimate of the actual power.

Surely not 900-1000, right? I don't know your setup but I would imagine at least 2x stock power? I'll go with 680 Anyways that makes sense, I'm in no way saying "ditch dynos! There's one built in!" but I would certainly imagine BMW would have it from the factory within 10% or so, at least below 4500 or so. As you said the effects of AFR and whatnot wouldn't be perfectly calculated so tuned it would make sense that it would get more inaccurate. My car fully stock reported 440 odd nm, and that's really spot on as we've seen from dynos. Seems to me like the DME just doesn't account for the massive pressure and resistance in the turbine housing that robs us stock turbo guys of all that powah, and it reads really high up top. Is that pretty close? Thanks for the reply by the way. I'm fascinated by the sophistication of our DMEs

[umitp]

hello everybody can somebody check about my logs ? 07 335i e93 fbo without inlets mhd stg2 plus and xhp stg3 . pump fuel 91oct. thanks

https://datazap.me/u/umitp/20062021-...a=3-22&mark=66

https://datazap.me/u/umitp/20062021-2?log=0&data=3-22

[Saif2018]

Originally Posted by umitp

hello everybody can somebody check about my logs ? 07 335i e93 fbo without inlets mhd stg2 plus and xhp stg3 . pump fuel 91oct. thanks

https://datazap.me/u/umitp/20062021-...a=3-22&mark=66

https://datazap.me/u/umitp/20062021-2?log=0&data=3-22

LPFP dropping below 50 psi, and timing corrections probably due to poor fuel (91 Oct)

Try 93oct fuel if you can get hold of it. Probably a good idea to upgrade LPFP to a stage 2 one, as well.

[umitp]

Originally Posted by Saif2018

LPFP dropping below 50 psi, and timing corrections probably due to poor fuel (91 Oct)

Try 93oct fuel if you can get hold of it. Probably a good idea to upgrade LPFP to a stage 2 one, as well.

Thanks for your reply. I use best fuel in here but its also no good. LPFP i will search about stage 2 if it will be good

[Saif2018]

Originally Posted by umitp

Thanks for your reply. I use best fuel in here but its also no good. LPFP i will search about stage 2 if it will be good

Plugs and coils been done recently?

[RSL]

Originally Posted by ab987

Surely not 900-1000, right? I don't know your setup but I would imagine at least 2x stock power? I'll go with 680 Anyways that makes sense, I'm in no way saying "ditch dynos! There's one built in!" but I would certainly imagine BMW would have it from the factory within 10% or so, at least below 4500 or so. As you said the effects of AFR and whatnot wouldn't be perfectly calculated so tuned it would make sense that it would get more inaccurate. My car fully stock reported 440 odd nm, and that's really spot on as we've seen from dynos. Seems to me like the DME just doesn't account for the massive pressure and resistance in the turbine housing that robs us stock turbo guys of all that powah, and it reads really high up top. Is that pretty close? Thanks for the reply by the way. I'm fascinated by the sophistication of our DMEs

Max it's ever been is around 475-500whp, hybrids on pump gas only, but probably closer to 400whp there.

Settings/stock tune are different depending on rom/revision/ZB. Mine is DCT. If you want it close to reality, it will need to be measured and adjusted. Most raise it as much as they can within limits to increase hydraulic pressures in the trans though.

Here are old trans logs with varying torque actual to show the pressure changes. v1 is an old stock 335is INA0S, about 500nm peak torque actual, v3 is about 540nm peak torque actual and v5 is about 775nm peak torque actual. Pressures are in bar, clutch 2 is engaged where the marker is.

[umitp]

Originally Posted by Saif2018

Plugs and coils been done recently?

Yes, but im thinking about s55 coils and 1 step colder plugs for more reliability ? Also ordered fuel it stg2 lpfp already now 👍

[Grip Grip]

Can someone take a look and let me know how much more these hybrid turbos can go based on the WGDC's. Also, any other observations and/or suggestions would be great. The torque limiting is killing the 3-4 shift, but I'm getting XHP this weekend which should eliminate that. Car was doing 3/4 seconds per 10 MPH until the shift where it doubled. Pretty sad for a DCT car.

Hybrid turbos (DAW775's), Stage 2 LPFP, inlets/outlets, 7 1/2" intercooler, PI with 550cc injectors, Motiv tuning (Chris), and VRSF exhaust.

https://datazap.me/u/awheelus/335is-...22-26-29-30-31

[Saif2018]

Guys can you take a look at my log to see if all is ok, would like to hear a second opinion.

Currently on v3.1 JSR custom tune with 1M Throttle tables.

https://datazap.me/u/shelim2020/jsr-...=0&data=3-4-23

[Saif2018]

Originally Posted by umitp

Yes, but im thinking about s55 coils and 1 step colder plugs for more reliability ? Also ordered fuel it stg2 lpfp already now 👍

1 step colder isn't necessary in my opinion. OEM plugs should be good enough. Saying that 1 step colder should be fine as well.

[socalva]

Originally Posted by Saif2018

You'll have to physically check or get someone to check if there's play on the actuator arms and tighten.

https://www.e90post.com/forums/showthread.php?t=176269

Just to note any software fix to Wastegate rattle will introduce lag.

I just did this yesterday to my front and rear turbos and I'm back making normal'ish boost. Spools faster too! Took about 1.5 hours.. the rear was super easy, the front didnt make sense until I took the fan and air canisters off. Also good idea to cut the 8mm washers into horseshoe shapes so you can just slide it on over the bolt

This is what i followed for the front:

[Saif2018]

Originally Posted by socalva

I just did this yesterday to my front and rear turbos and I'm back making normal'ish boost. Spools faster too! Took about 1.5 hours.. the rear was super easy, the front didnt make sense until I took the fan and air canisters off. Also good idea to cut the 8mm washers into horseshoe shapes so you can just slide it on over the bolt

This is what i followed for the front:

Nice, 👍 post a log

[studio54]

Hey,

I gave a new try to V9 on 91oct (95ron), it's definitely faster than V7 but i get a lot of timing corrections, probably crappy gas? Plugs are almost new, and coils are not so old. But my injectors are maybe not in the best shape...

I like how V9 boost follow target, but a bit concerned with all those corrections.

100-200 on log (9.7sec approx) (too bad i have no dragy device) is not so bad for this fueling, better than V7 on the same (flat) road where it was something like 10.70 or something.

I don't know if i should flash the lowest fuel ACN91/CAD94 map to get rid of corrections ?

I only have access to this crappy 95RON, and no access to E85 or something, the only solution i have is to buy some octane booster but it's not a long term good idea.

Any thing i should be concerned about beside the corrections?


https://datazap.me/u/studio54/log-1625087105?log=0&data=3-22

Thanks

[Markoss96]

Hi guys I'm new to this forum & I'm also kind of new to the modifying car scene I'm looking to learn how to read my data logs as I'm having issues with my bmw 135i n54 I am getting CEL & code 29f2. I'm currently running MHD stage 2+ map on 93OCT. I have added a data zap link to my log if anyone could take a look & let me know if it looks good or not it would be greatly appreciated.
https://datazap.me/u/markoss96/log-1...og=0&data=3-22