[j1980mac]

Originally Posted by GT500R

Some quick figures -

Max Boost ~ 21.3 PSI
Max RPM ~ 7069
AFR Ave ~ 14.6 (kinda high?)

Is the AFR high?

[j1980mac]

Originally Posted by dereksM3

Interesting comment from ER, curious to see if they find the M40i is slightly different than others. Seems most B58 DP's cross reference 3, 5, and would appear X series (singe they have the same PN) so wonder if this isn't true.

Confirmed. M40i fitment is different. ER just emailed me a shipping label for my stock DP.

[dereksM3]

Originally Posted by j1980mac

Confirmed. M40i fitment is different. ER just emailed me a shipping label for my stock DP.

Well that kinda sucks but at least that's now good to know. Are they going to develop one that fits?

[j1980mac]

Originally Posted by dereksM3

Well that kinda sucks but at least that's now good to know. Are they going to develop one that fits?

They sure are. Exactly from my factory down pipe. They may even cover my reinstall fee. 👍🏻

[GT500R]

Originally Posted by j1980mac

Is the AFR high?

They measured at the tailpipe I assume. And since you had a leak that wouldn’t help either. I would say they are fine and prob .5 or so higher then reality.

[GT500R]

Originally Posted by j1980mac

They sure are. Exactly from my factory down pipe. They may even cover my reinstall fee. 👍🏻

#excited

[j1980mac]

Originally Posted by GT500R

They measured at the tailpipe I assume. And since you had a leak that wouldn’t help either. I would say they are fine and prob .5 or so higher then reality.

I don't know what's high what's low. The exhaust leak is fairly insignificant.

[dereksM3]

BMW runs these new DI engines on the leaner side compared to most. However, they generally run low 14's to high 13's up to redline. Measuring from the tailpipe usually shows about .5 higher than it really is so your not too far off.

[j1980mac]

Originally Posted by dereksM3

BMW runs these new DI engines on the leaner side compared to most. However, they generally run low 14's to high 13's up to redline. Measuring from the tailpipe usually shows about .5 higher than it really is so your not too far off.

I'm not sure where they measured it? I assumed they were plugged in via OBD2.

[j1980mac]

Here are a couple of graphs.

Looks like I'm right at about 16.5 AFR right when it gets in throttle.

I don't think boost gets over 20.5 PSI.

[GT500R]

Originally Posted by j1980mac

Here are a couple of graphs.

Looks like I'm right at about 16.5 AFR right when it gets in throttle.

I don't think boost gets over 20.5 PSI.

Based on the excel sheet those numbers are incorrect above.

Also any word for the DP being made more for the X3 M40i?

[j1980mac]

Originally Posted by GT500R

Based on the excel sheet those numbers are incorrect above.

Also any word for the DP being made more for the X3 M40i?

What's incorrect specifically?

[GT500R]

Originally Posted by j1980mac

What's incorrect specifically?

Based on the CVS file you uploaded, here is the graph of boost vs. RPM



You max PSI is 21.3 @ 5615 - 5696 RPM

[j1980mac]

Originally Posted by GT500R

Based on the CVS file you uploaded, here is the graph of boost vs. RPM



You max PSI is 21.3 @ 5615 - 5696 RPM

I was estimating. Do you think it's at a bad level?

[ParadigmDawg]

Originally Posted by j1980mac

I was estimating. Do you think it's at a bad level?

It's going to blow up real soon......

[j1980mac]

Originally Posted by ParadigmDawg

It's going to blow up real soon......

Gosh I hope not.

[GT500R]

Originally Posted by j1980mac

I was estimating. Do you think it's at a bad level?

Well since Paradigm is running 6+ psi (map5) over stock (16 psi) with a higher level of AFR, I would say you're probably at least safer then him

[j1980mac]

Originally Posted by GT500R

Well since Paradigm is running 6+ psi (map5) over stock (16 psi) with a higher level of AFR, I would say you're probably at least safer then him

I am almost relieved.

[dereksM3]

Originally Posted by j1980mac

I was estimating. Do you think it's at a bad level?

I don't think it's a bad level, as mentioned the JB4 on a more aggressive map is running more boost without control of timing and limited fuel control. With that said, I think the actual plot of boost looks less than ideal to me and would explain your rather noticeable dip in power after 5k rpm.

[ParadigmDawg]

Originally Posted by j1980mac

Gosh I hope not.

You do know I'm just giving you a hard time, correct?

[j1980mac]

Originally Posted by ParadigmDawg

You do know I'm just giving you a hard time, correct?

Dude, I'll be coming up there to DFW to get your motor! Haha

[dereksM3]

Originally Posted by j1980mac

They sure are. Exactly from my factory down pipe. They may even cover my reinstall fee. ����

This is awesome!

One thing to note that I found out being curious is that RealOEM lists different PN's for many B58 related engines. For instance, the F22 (2-series), F30 (3-series), G30 (5-series), G01 and G05 (X-series) all have different PN #'s for their downpipes. Which is odd because multiple vendors list that their downpipes to fit 2 series, 3 series, and G series models. Also, it's worth noting for the applicable model the RWD or X-Drive have the same PN. The only thing I can decipher is the new models include a Euro 6 description. I really wonder if mechanically they are the same but have different ratings based on the year of Production.

I'm extremely curious as to what ER says as I can't see many MFG's making X-series downpipes if they are indeed different since it's such a small market of buyers.