[IMS-340C]

This thread is dedicated to discuss anything related to the B58 tuning and fueling options.

For a start here's what the 340i/440i Standard and MPPSK stock tunes look like through the RPM range in the tables below.

Basically when you floor the gas pedal those are the torque numbers (in NM) the tune requests the DME to achieve through the RPM range.

The DME then calculates how much Load/Boost required to achieve the Torque Requested tables below.

Our DMEs uses torque to make it's calculations, to convert those numbers to HP either convert NM to lb-ft X RPM and divide by 5252 or directly multiply those numbers X RPM and divide by 7120.

[Jmcfly81]

I'm trying to not void my warranty, wondering if adding a charge pipe and down pipe is possible without a tune? Im assuming the tune would definitely void the warranty. Any feedback would be appreciated, 2018 340i xdrive AT

[BMWILUVU]

Originally Posted by IMS-340MP

This thread is dedicated to discuss anything concerning the B58 tuning.

For a start here's what the 340i/440i Standard and MPPSK stock tunes look like across the RPM range (below)

Basically when you floor the gas pedal those are the torque (in NM) numbers the tune requests the ECU to achieve fro the engine across the RPM range.

Our ECUs uses torque to make it's calculations, to convert those numbers to HP either convert NM to lb-ft X RPM and divide by 5252 or directly multiply those numbers X RPM and divide by 7120.

What software are you using?

[IMS-340C]

Here are some tuning and coding stuff:

Coding Instrument cluster to remove the 263 Km/h Cap :

Modified Sports Displays to read higher numbers :

[IMS-340C]

My latest Tune 87 octane + E10 tune:

https://datazap.me/u/ims/ims-e10-175...20&zoom=98-277

Dragy 100-200 - Negative Slope - 30 Km/h Head wind:
v

[IMS-340C]

Increased midrange boost and timing, starting to see some corrections.

That's it will not go any further.

https://datazap.me/u/ims/ims-e10-175...39&zoom=40-214

Dragy 100-200 same conditions:
v

[IMS-340C]

I noticed lately there are questions and some confusion about Ethanol.

Here are some answers and information about Ethanol:

- Ethanol is NOT ROCKET FUEL, it's an Alcohol which is actually less Flammable and has less Combustion energy than Gasoline.
- Ethanol works as an Octane Booster which allows the use of more Boost/Timing which translate to more power.
- Up to 10% Ethanol clears most Timing Corrections.
- Up to 30% Ethanol allows the use of a higher Tune, example from Stage 1 91/95 up to Stage 2 95/102.
- Gasoline Tunes can be used with Ethanol mixed Fuel but Ethanol Tunes can't be used with Ethanol free Fuel.
- Ethanol is not needed if there are no Timing corrections and if there is a good Timing Advance of 14 degrees at 6500-6800 RPM.
- The Stock HPFP maxes out at around 30-32% Ethanol when running high Boost because Ethanol has higher Density than Gasoline.
- Gasoline mixed with Ethanol to reach XX octane produce less power than same XX octane Ethanol free Gasoline.
- E85 is 85% Ethanol and 15% Gasoline.

[dinan5m3]

Followed along every points made in last post except for following.

So, pump 93 octane mixed with Ethanol for ~E30 blend makes less power than same pump 93 octane without the mix?

Originally Posted by IMS-340C

- Pump Gasoline mixed with Ethanol produce less power than same octane Ethanol free pump Gasoline.

Originally Posted by IMS-340C

- Ethanol works as an Octane Booster which allows the use of more Boost/Timing which translate to more power.

[oem.plus_440gc]

Originally Posted by dinan5m3

Followed along every points made in last post except for following.

So, pump 93 octane mixed with Ethanol for ~E30 blend makes less power than same pump 93 octane without the mix?

No. Its about octane rating. By adding ethanol, you raise the effective octane rating. So lets say with an e30 mix (93/e85) your octane is around 100. If you ran an ethanol free 100 octane gasoline, you should be able to make the same, or more power. But since 100 octane gasoline isn't readily available, running an ethanol blend allows easier access to a higher octane fuel, allowing more timing and boost.

[dinan5m3]

Originally Posted by oem.plus_440gc

No. Its about octane rating. By adding ethanol, you raise the effective octane rating. So lets say with an e30 mix (93/e85) your octane is around 100. If you ran an ethanol free 100 octane gasoline, you should be able to make the same, or more power. But since 100 octane gasoline isn't readily available, running an ethanol blend allows easier access to a higher octane fuel, allowing more timing and boost.

Ok, ok, i get it, took little longer.

So, 100 octane/0% ethanol > 93/e30 mix (around 100 octane) > 93/e10

[dinan5m3]

Originally Posted by oem.plus_440gc

But since 100 octane gasoline isn't readily available,

Following fuel is available at the pump at local gas station,

https://rockettbrand.com/ps_100.html

[IMS-340C]

100 octane 0% E > 100 octane reached using E mix.

Originally Posted by dinan5m3

Ok, ok, i get it, took little longer.

So, 100 octane/0% ethanol > 93/e30 mix (around 100 octane) > 93/e10

[IMS-340C]

It's much simple than this.

Both fuels same octane so timing will be the same.

Ethanol is much slow burning than Gasoline so the fuel containing Ethanol will create lower combustion energy which will result in less power.

Real world example Formula 1 engines this year lost 50 HP because they added 5% Ethanol.

Hope it makes sense now.

Originally Posted by gantona

I may be wrong, but I don't agree about the sentence in bold.
more ethanol need to be injected to get clean on AFR.
if same octane rating than non E fuel, DME will add more fuel to have the correct AFR. It will give same power as non E fuel, but using more fuel...

please correct me if I'm wrong

[WrxToBeamerGuy]

Originally Posted by IMS-340C

It's much simple than this.

Both fuels same octane so timing will be the same.

Ethanol is much slow burning than Gasoline so the fuel containing Ethanol will create lower combustion energy which will result in less power.

Real world example Formula 1 engines this year lost 50 HP because they added 5% Ethanol.

Hope it makes sense now.

But they wouldn't have lost HP if their fuel pump and DME increased the amount of fueling going to the cylinders?

[IMS-340C]

Sorry to continue with Formula 1 they are capped by a specific fuel flow.

Originally Posted by WrxToBeamerGuy

But they wouldn't have lost HP if their fuel pump and DME increased the amount of fueling going to the cylinders?

[WrxToBeamerGuy]

Originally Posted by IMS-340C

Sorry to continue with Formula 1 they are capped by a specific fuel flow.

So I'm aware that 100 Octane > 93/e30 100 Octane because ethanol is less energy dense so you need more of it to produce the same amount of energy. So I guess what I am assuming is that F1 could have ramped up the amount of fuel they mix with air to compensate for the increased E. You're saying that the fuel flow is limited for F1 so that's why they lost 50hp?

Also I'm learning a lot from all of your comments so don't stop sharing your knowledge please

[IMS-340C]

Yes you are right if they inject more fuel and boost more air they will recover the 50 HP but the rules say they can't use more fuel.

Are you following F1 ? there are 2 races in the U.S. this year Miami and Texas and next year Las Vegas will join.

Originally Posted by WrxToBeamerGuy

So I'm aware that 100 Octane > 93/e30 100 Octane because ethanol is less energy dense so you need more of it to produce the same amount of energy. So I guess what I am assuming is that F1 could have ramped up the amount of fuel they mix with air to compensate for the increased E. You're saying that the fuel flow is limited for F1 so that's why they lost 50hp?

Also I'm learning a lot from all of your comments so don't stop sharing your knowledge please

[markoz28]

I don’t watch F1 but I do watch the show on Netflix. It’s so great. I’m a huge fan of Mclaren and Redbull. Sick of Ferrari and Mercedes

[dinan5m3]

Originally Posted by IMS-340C

- Gasoline Tunes can be used with Ethanol mixed Fuel but Ethanol Tunes can't be used with Ethanol free Fuel.

Can the (MHD OTS) 93oct tune (gasoline tune) be used with E30 mixed with 93 octane fuel in the tank?

[IMS-340C]

Yes but that would be way too much Ethanol without a benefit.

Better try 95 oct tune with E20 mix and see the logs.

Originally Posted by dinan5m3

Can the (MHD OTS) 93oct tune (gasoline tune) be used with E30 mixed with 93 octane fuel in the tank?

[IMS-340C]

But to burn more fuel you need more air.

The DME has a pre-determined AFR (Air Fuel Ratio) in a LOAD/RPM/AFR table. (See 1st post)

It only adjusts the F part of AFR but not the A.

This is a quick comparison I did between Gasoline only and Gasoline + 20% Ethanol:

100-200 MHD Stage 1 95 - Gasoline only: 9.3 seconds.
100-200 MHD Stage 1 95 - Gasoline + E20: 9.6 seconds.

Originally Posted by gantona

Your exemple is good. I think it would be same power, but more fuel used (because of E)
It’s same octane, so we can reach same timing.
Boost should be the same… just more fuel.
No ?

Originally Posted by markoz28

I think what he’s saying is if you have 93 octane with no ethanol but you have 91 mixed with 2 gallons of E to make 93 octane, the 93 with no ethanol would be better. I agree since the fuel pump will have to work a bit harder with the 91 and ethanol mix.

Maybe?

[Jnat]

I'm running the Stg 2+ 95 MHD tune with a shot of boostane, 93 octane and a gallon or two of ethanol. Results have been strong.