[T_H_O_M_A_S]

Originally Posted by enemigo13

to make that time you need ~550hp and stock turbo will not give it for sure

oh it almost does numbers are in whp

only mods are Cat/opf delete and tu pump .

these are all mhd maps froma few years ago running e40 mix.

[DieselDuck]

Originally Posted by IMS-340C

Congrats DD you got one strong B58 out there that's M5/M8 comp 100-200 level.

Looks like the early shifting actually helped as you can see from the speed curve the car accelerated harder from 190 to 200.

Weight M140i 1545 kgs, 340i 1615 kgs
Tyre Diameter M140i 630 cm, 340i 660 cm

Ty IMS-340C and welcome back . Regarding the shifting, while my 190-200 is good my 180-190 time isn't, probably as that's why the shift happened. If you look at the 180 to 200 time it's slower than every other M140i on the list that ran around my 100-200 time if I look at the dragy leaderboards, hence I suspect making sub 7 doesn't seem impossible to me, although I won't make any claims until I could give it a try, and quite honestly I don't care enough either haha because I'm not complaining and the car always felt strong and smooth with MHD.

edit: I guess Thomas confirms it

[IMS-340C]

That highest HP dyno map hits peak HP @5200-5500 RPM I guess you shifted @6000-6200 RPM for maximum acceleration ?

But to be fair I also saw a couple of M240is struggling to break into the sevens running E40 map.

Anyway the M140is on E40 map is crazy quick, here are some 100-200 for some powerful cars:

Originally Posted by T_H_O_M_A_S

oh it almost does numbers are in whp

only mods are Cat/opf delete and tu pump .

these are all mhd maps froma few years ago running e40 mix.

[IMS-340C]

I never left I always keep an eye on you guys

Maybe you should try shifting 4th to fifth and fifth to sixth @6000-6200 RPM and I guess you are starting the 100-200 in 4th gear ?

Originally Posted by DieselDuck

Ty IMS-340C and welcome back . Regarding the shifting, while my 190-200 is good my 180-190 time isn't, probably as that's why the shift happened. If you look at the 180 to 200 time it's slower than every other M140i on the list that ran around my 100-200 time if I look at the dragy leaderboards, hence I suspect making sub 7 doesn't seem impossible to me, although I won't make any claims until I could give it a try, and quite honestly I don't care enough either haha because I'm not complaining and the car always felt strong and smooth with MHD.

edit: I guess Thomas confirms it

[DieselDuck]

Originally Posted by IMS-340C

I never left I always keep an eye on you guys

Maybe you should try shifting 4th to fifth and fifth to sixth @6000-6200 RPM and I guess you are starting the 100-200 in 4th gear ?

Definitely in normal real life situations there's not much point shifting after 6500 rpm as stock turbocharger on a b58 gen1 starts to run out of steam and lose efficiency on the high rpm, at least on the more powerful e-mix maps.

Here you see data of one of the logs I pulled of my car some while ago which kind of confirms that the mid-range is especially strong.

[IMS-340C]

I agree and if your HP curve is like the dyno posted above and your HP peaking @5250-5500 RPM you'd be better off shifting @6000-6200 so that the RPM drops to 4800 RPM for the next gear this way you would stay in the sweet spot of the HP for maximum acceleration.

Originally Posted by DieselDuck

Definitely in normal real life situations there's not much point shifting after 6500 rpm as stock turbocharger on a b58 gen1 starts to run out of steam and lose efficiency on the high rpm, at least on the more powerful e-mix maps.

Here you see data of one of the logs I pulled of my car some while ago which kind of confirms that the mid-range is especially strong.

[cheddarcheese1204]

Why is it so slow

[IMS-340C]

Can you post a log ?

Originally Posted by cheddarcheese1204

Why is it so slow

[cheddarcheese1204]

Originally Posted by IMS-340C

Can you post a log ?

Can I use MHD mobile datalog? I've never done datalogging before haha

[Skyhigh]

That kind of explains your poor performance…. Blindly tuning without logging and analysing is a hit or miss. (And quite frequently a miss)

https://www.bimmerpost.com/forums/sh...php?p=25202060

[IMS-340C]

MHD mobile datalog is an app to open the log you need the log itself, do the following:
Open MHD app and go to Mon. in the bottom menu
While cruising in Manual mode in 3rd preferably 4th gear 3000 RPM Click Data Logging in the opened MHD app then Click Start Log then floor the throttle till 6700 RPM then click Stop in the app.
The app saves the log automatically
Go to MHD folder on the phone you will the log in the Data Logging folder.
Go to www.datazap.me and upload the log then share the link here.

Originally Posted by cheddarcheese1204

Can I use MHD mobile datalog? I've never done datalogging before haha

[cheddarcheese1204]

Originally Posted by IMS-340C

MHD mobile datalog is an app to open the log you need the log itself, do the following:
Open MHD app and go to Mon. in the bottom menu
While cruising in 3rd preferably 4th gear 3000 RPM Click Data Logging in the opened MHD app then Click Start Log then floor the throttle till 6700 RPM then click Stop in the app.
The app saves the log automatically
Go to MHD folder on the phone you will the log in the Data Logging folder.
Go to www.datazap.me and upload the log then share the link here.

okay ill post later tonight. thank you. should i do a 1/4 mile pull as well?

[IMS-340C]

Not needed but if you want why not and you can log it aswell.

Originally Posted by cheddarcheese1204

okay ill post later tonight. thank you. should i do a 1/4 mile pull as well?

[cheddarcheese1204]

Originally Posted by IMS-340C

Not needed but if you want why not and you can log it aswell.

I did the pulls you told me to do twice and logged a 1/4 mile as well. I dont know which one is which tho lol. Very new to this.

https://datazap.me/u/bluecheese1204/...og=0&data=3-19

https://datazap.me/u/bluecheese1204/...og=0&data=3-19

[cheddarcheese1204]

Originally Posted by Skyhigh

That kind of explains your poor performance…. Blindly tuning without logging and analysing is a hit or miss. (And quite frequently a miss)

https://www.bimmerpost.com/forums/sh...php?p=25202060

Thanks man

[IMS-340C]

Yeah that explains the slow dragy 100-200 and also your 1/4 mile trap speed is low for that tune.
Timing corrections are borderline but what's really hurting your performance is the extremely low Ignition Timing and it's a result of the very high IAT.

For timing corrections you need to add 5-10 liters of Ethanol and upgrade your HPFP as it's already struggling with Stage 2's boost.
So for the time being your only choice is switching to Stage 1 - 91 Octane map.

For the high IAT / low Ignition Timing unfortunately there's not much you can do other than checking the intercooler coolant cycle and changing the coolant may help give it a try.
B58 Gen 1 IAT cooling system works well in cold weather but when it gets warm/hot it's crap and will heat soak I can't believe BMW produced such a poor system.

From your log Ignition Timing is close to zero it should be at the very least 6-8 degrees @6250-6500 RPM.

Originally Posted by cheddarcheese1204

I did the pulls you told me to do twice and logged a 1/4 mile as well. I dont know which one is which tho lol. Very new to this.

https://datazap.me/u/bluecheese1204/...og=0&data=3-19

https://datazap.me/u/bluecheese1204/...og=0&data=3-19

[cheddarcheese1204]

Originally Posted by IMS-340C

Yeah that explains the slow dragy 100-200 and also your 1/4 mile trap speed is low for that tune.
Timing corrections are borderline but what's really hurting your performance is the extremely low Ignition Timing and it's a result of the very high IAT.

For timing corrections you need to add 5-10 liters of Ethanol and upgrade your HPFP as it's already struggling with Stage 2's boost.
So for the time being your only choice is switching to Stage 1 - 91 Octane map.

For the high IAT / low Ignition Timing unfortunately there's not much you can do other than checking the intercooler coolant cycle and changing the coolant may help give it a try.
B58 Gen 1 IAT cooling system works well in cold weather but when it gets warm/hot it's crap and will heat soak I can't believe BMW produced such a poor system.

From your log Ignition Timing is close to zero it should be at the very least 6-8 degrees @6250-6500 RPM.

okay i appreciate your help do you think i have a boost leak?

[IMS-340C]

No, it's the Ignition Timing.

Originally Posted by cheddarcheese1204

okay i appreciate your help do you think i have a boost leak?

[Nugget]

You interested in b58 Supra times in here?
Air was good but road was cold and damp so there was a bit of wheelspin at the start.
Just the driver, full tank, car loaded up as I was heading to the track.
Rolled into it in 4th from around 80kmh.

2019 Supra, AMS Alpha 8 on e85.
The log isn't from the run, but it was taken on the same day.
I have since received another revision from the tuner but haven't had a chance to test it.

https://datazap.me/u/nugs/road-logs?...-59&zoom=4-131

[IMS-340C]

Impressive 100-200 nice log too just ask your tuner to smooth that boost hump at 5K RPM which is most likely causing ignition timing to crash.

Originally Posted by Nugget

You interested in b58 Supra times in here?
Air was good but road was cold and damp so there was a bit of wheelspin at the start.
Just the driver, full tank, car loaded up as I was heading to the track.
Rolled into it in 4th from around 80kmh.

2019 Supra, AMS Alpha 8 on e85.
The log isn't from the run, but it was taken on the same day.
I have since received another revision from the tuner but haven't had a chance to test it.

https://datazap.me/u/nugs/road-logs?...-59&zoom=4-131

[B58togo]

Originally Posted by Nugget

You interested in b58 Supra times in here?
Air was good but road was cold and damp so there was a bit of wheelspin at the start.
Just the driver, full tank, car loaded up as I was heading to the track.
Rolled into it in 4th from around 80kmh.

2019 Supra, AMS Alpha 8 on e85.
The log isn't from the run, but it was taken on the same day.
I have since received another revision from the tuner but haven't had a chance to test it.

https://datazap.me/u/nugs/road-logs?...-59&zoom=4-131

That's damn quick, likely high 5 60-130.

[Michalt]

First times with dragy
340i rwd, catted dp, tu pump and MHD stage 2 98ron

I thought it would go better. Could this be my bad impression?