[BMW335l]

Originally Posted by IMS-340C

Here 25C is my cold weather map Gasoline maps are good up to 25% Ethanol so no worries.

As for weather at the end it's all about IAT, the IAT and Coolant Temp. control timing.

Attached is my gasoline table I use, with Ethanol I can considerably reduce the reduction in Timing. Vertical axis is IAT, Horizontal axis is Coolant, Table values are Timing Reduction %.

Example: at IAT 35C and Coolant 100C DME will reduce timing by 38%

Very interesting!
So you think that BM3 uses stock values for behind the scenes corrections?
Feels like every other person running bm3 should have this issue then. Bm3 have the option for sports cooling, but I dont know if thats the intercooler or engine. My preference would be to run engine sport cooling only in sport+. Do you think I need new Coolant?

https://www.bootmod3.net/log?id=6653...c70e1310e85f3a

https://www.bootmod3.net/log?id=6653...6b8c3377f6bf24

https://www.bootmod3.net/log?id=6653...c70e1310e85f13

The logs seem to look okay though.

[IMS-340C]

It's not an issue, the DME is doing what it is designed to do, with higher IAT DME increase boost and decrease timing.

And since you have minor corrections means you can't increase timing anyway unless you reduce boost, you can't have both.

If you still want more timing then switch to an Ethanol Map.

Originally Posted by BMW335l

Very interesting!
So you think that BM3 uses stock values for behind the scenes corrections?
Feels like every other person running bm3 should have this issue then. Bm3 have the option for sports cooling, but I dont know if thats the intercooler or engine. My preference would be to run engine sport cooling only in sport+. Do you think I need new Coolant?

https://www.bootmod3.net/log?id=6653...c70e1310e85f3a

https://www.bootmod3.net/log?id=6653...6b8c3377f6bf24

https://www.bootmod3.net/log?id=6653...c70e1310e85f13

The logs seem to look okay though.

[BMW335l]

Originally Posted by IMS-340C

It's not an issue, the DME is doing what it is designed to do, with higher IAT DME increase boost and decrease timing.

And since you have minor corrections means you can't increase timing anyway unless you reduce boost, you can't have both.

If you still want more timing then switch to an Ethanol Map.

Yeah you are right. This is really the issue with the B58 gen 1. High compression and shitty fuel is not a good combo. Running E20 with a 93 tune is not great. Can I even expect to run a E30 tune with a reasonable amount of E? Im not sure

I opened up the Coolant tanks. I actually had pretty low levels, especially in the smaller one. Have ordered new caps. I guess it's the same Coolant fluid in both tanks?

[reinis]

Hello, im a happy owner of a 340i for 15k km already.
Ordered the car from auction in USA after a collision. Car came tuned with added boost, little bit of valve lift, stronger pops and retarded ignition, I guess they do that because in USA the fuel is worse or they have already saw the problem im meeting right now. On this same tune ive added ignition back to stock but the car cant seem to work with it.

I'm only running E98 Neste fuel which seems to be the best one we can get here in Baltic States. Haven't tried to add Ethanol into the mix yet. I've done a log with a few most necceseary parameters for best log frequency. Car corrects ignition on cyl1 strongly, on cyl2 a bit, when switched to 5th gear cyl1 and cyl4... All knock detection maps are stock.

https://datazap.me/u/reinis/340i-tun...9-10-11&solo=1

Spark plugs new NGK, compression same in all cylinders 14bar if my tool shows correctly. I had a bad waterpump (bearing) and it could vibrate but that is also new OE BMW.
If there is anyone with some suggestions about the tune i'd be ready to pay for information!

Edit: I have done more research since im starting to hear some weird sounds from head once in a while. I guess i might have a cracked cam ledge? ...if so, why does some misfires happen in cylinder 4?

[Michalt]

Hello again,
I installed today HPFP TU and flash to Multimap Stage 2 HPFP 98RON (fuel RON100)
Can you take a look at what it looks like?

https://datazap.me/u/black340i/hpfp-...og=0&data=4-23

https://datazap.me/u/black340i/hpfp-...og=0&data=4-23

[IMS-340C]

It's not too bad but not great as this HPFP tune has too much mid RPM boost, better switch to Stage 2 RON98 map and if you have access to Ethanol and want to take advantage of the TU pump give HPFP E40 map a try.

+ If Ethanol is too costly where you live you can run HPFP RON98 map and adding 5 liters of Ethanol or HPFP RON102 map and adding 10 liters of Ethanol.

Originally Posted by Michalt

Hello again,
I installed today HPFP TU and flash to Multimap Stage 2 HPFP 98RON (fuel RON100)
Can you take a look at what it looks like?

https://datazap.me/u/black340i/hpfp-...og=0&data=4-23

https://datazap.me/u/black340i/hpfp-...og=0&data=4-23

[Michalt]

Originally Posted by IMS-340C

It's not too bad but not great as this HPFP tune has too much mid RPM boost, better switch to Stage 2 RON98 map and if you have access to Ethanol and want to take advantage of the TU pump give HPFP E40 map a try.

+ If Ethanol is too costly where you live you can HPFP RON98 map and adding 5 liters of Ethanol or HPFP RON102 map and adding 10 liters of Ethanol.

Thank you for your answer. I understand that the TU pump change doesn’t do anything without changing the fuel and that stage2 will handle it easily?
Should I make mixtures with 98 or 100ron fuel? 5 liters ethanol give me mix ~e14 and 10 liters give ~ e23 yes?

[Skyhigh]

You can run the TU HPFP on any map without problems, but unless you run RON 102 or E maps, you won’t see any benefits. (Very limited gains on RON 98, Stage 2+).

Most people use RON 98 as base fuel for E mixes.

Math 3rd grade: 5 L in a 60 L tank = 8% (E8) …
You get bonus points if you guess how many %E 10L would give you 😉

[Michalt]

Originally Posted by Skyhigh

You can run the TU HPFP on any map without problems, but unless you run RON 102 or E maps, you won’t see any benefits. (Very limited gains on RON 98, Stage 2+).

Most people use RON 98 as base fuel for E mixes.

Math 3rd grade: 5 L in a 60 L tank = 8% (E8) …
You get bonus points if you guess how many %E 10L would give you 😉

Thanks for info!

Yours 10l gives e16
But does this take into account that 98 fuel already has e5 in it?

[Skyhigh]

No it doesn’t and not every 98 has E in it! They always write min E5 as this gives them legal freedom to have traces of E. In some countries they do in fact have some, in others - not. You need to measure for yourself to know for sure. Here 98 has zero E, 95 has about 3% E. The one is labelled E5, the other either E5 or E10.

Either way- don’t forget that E in the pump fuel is NOT on top of the octane rating but used to achieve the labelled octane rating. The less E in pump fuel you have - the better.

So forget about any E in the fuel itself - calculate assuming there isn’t any. That’s more conservative.

[IMS-340C]

Stage 2 HPFP RON98 and RON102 maps on RON98/RON102 fuel are useless in my opinion as with the increased boost most likely you will end up with timing corrections, they only run well if you mix them with Ethanol.

MHD should replace them with HPFP E10 and E20 maps

You can mix Ethanol with RON98 no problem.

340i's fuel tank is 55 liters so as Skyhigh said:
5 liters Ethanol mixed with 50 liters of Petrol = E9.1
10 liters = E18

Originally Posted by Michalt

Thank you for your answer. I understand that the TU pump change doesn’t do anything without changing the fuel and that stage2 will handle it easily?
Should I make mixtures with 98 or 100ron fuel? 5 liters ethanol give me mix e15 and 10 liters give e20 yes?

[Skyhigh]

Stage 2 HPFP RON 102 is great! runs fine and deliveres noticeable torque and power increases. Love that map - to me it subjectively performs better than E40.

I doubt that 340i’s tank is smaller than 440i’s tank, which is 60L (although the gauge only measures up to 55).

[Michalt]

👍Now everything is clear. So I buy ethanol and come back with logs on e10 with hpfp98ron map or e20 with hpfp102ron map.

[IMS-340C]

Yeah 5 liters E > HPFP RON98 map, 10 liters E > HPFP RON102 map.

Originally Posted by Michalt

👍Now everything is clear. So I buy ethanol and come back with logs on e10 with hpfp98ron map or e20 with hpfp102ron map.

[IMS-340C]

Hey Sky long time Are you comparing to Stage 2 RON98 or Stage 2 RON102 map ?

On pure RON98 fuel B58 Gen 1 hits Octane limit before HPFP limit, I.E. you will get timing corrections before Fuel pressure dips in the log that's why an upgraded HPFP will not make a difference.

Do you have a log for HPFP RON102 map ? Also I am curious if you logged HPFP RON102 map on RON102 fuel and Stock HPFP ?

+ From your findings on RON102 Stock HPFP reaches it's limit before Octane Timing Corrections ?

Originally Posted by Skyhigh

Stage 2 HPFP RON 102 is great! runs fine and deliveres noticeable torque and power increases. Love that map - to me it subjectively performs better than E40.

I doubt that 340i’s tank is smaller than 440i’s tank, which is 60L (although the gauge only measures up to 55).

[Ausmurry]

Hey guys, first time tuning a B58, I went stage 2 MHD and the car doesnt feel as fast as it should, Details:

2017 340i 6 Speed, originally had MPPSK tune, Car has CTS Turbo high flow downpipe, mst intake with swap in larger K&N Filter, NGK spark plugs gapped to .22, No codes or errors and 65k miles

I am in Oregon using 92 octane

Heres my logs:

https://datazap.me/u/ausmurry/0612-n...og=2&data=4-18

Feels like im getting a decent amount of cylinder correction, especially cyl 1

Thank you

[Skyhigh]

Yep. Heavy corrections!! Don’t drive this setup! You need better (higher octane) fuel for this map!

[Ausmurry]

Originally Posted by Skyhigh

Yep. Heavy corrections!! Don’t drive this setup! You need better (higher octane) fuel for this map!

Why would this be the case on a 91 map using 92? I use Chevron pretty exclusively.

[Skyhigh]

Because the maps are pretty aggressive and fuel is not always up to the advertised octane and quality. This, to a different degree, is the case for 80% of us, why do you think it should be different for you 😜

I’d say, based on what I read in forums and own experience, you need to aim for pump fuel with at least 2 octanes higher than the map you run in order to have a good chance of smooth/decent logs.
If you have access to E85 - that’s your easiest solution.

[Ausmurry]

Originally Posted by Skyhigh

Because the maps are pretty aggressive and fuel is not always up to the advertised octane and quality. This, to a different degree, is the case for 80% of us, why do you think it should be different for you 😜

I’d say, based on what I read in forums and own experience, you need to aim for pump fuel with at least 2 octanes higher than the map you run in order to have a good chance of smooth/decent logs.
If you have access to E85 - that’s your easiest solution.

I do have access to E85, With the first gen b58 pump I think I read e20 should be fine for the fuel system, or do you think bumping up to e30 would be okay.

[Skyhigh]

You do not need to go that high. Try 10% E85 first and see what the logs say. Trial-error approach.

[IMS-340C]

Tune is not too aggressive it's producing only 16.5 psi at 6500 RPM and timing is not aggressive either.

Problem is fuel is crap, add 10 liters of E85 and you'll be good and maybe you can even run Stage 2 93 OCT.

My problem with this map it produces high boost a mid-range and low boost at high RPM, I prefer the other way round.

Originally Posted by Ausmurry

Hey guys, first time tuning a B58, I went stage 2 MHD and the car doesnt feel as fast as it should, Details:

2017 340i 6 Speed, originally had MPPSK tune, Car has CTS Turbo high flow downpipe, mst intake with swap in larger K&N Filter, NGK spark plugs gapped to .22, No codes or errors and 65k miles

I am in Oregon using 92 octane

Heres my logs:

https://datazap.me/u/ausmurry/0612-n...og=2&data=4-18

Feels like im getting a decent amount of cylinder correction, especially cyl 1

Thank you