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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Virtual Dyno Results (with logs) – Stock to Stage 2+ FBO – Interesting Data and Info
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      10-15-2021, 03:34 PM   #67
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      10-18-2021, 03:22 AM   #68
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Quote:
Originally Posted by AmuroRay View Post
With MHD, the MAF G/S can tell how much power you’re making? I think you need to multiply it by 1.1 to find the approximate whp.
1.25 align with the performance of my car comparing it to other cars with similar power/weight. MAF 400 g/s

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My M135i: 1550kg, 500hp, 100-200 in ~7.6sec ±0.1 depending on weather
991 GT3 RS: 1500kg, 520hp, 100-200 in 7.6sec
458 Italia: 1600kg, 562hp, 100-200 in 7.5sec
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      10-18-2021, 08:32 AM   #69
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Quote:
Originally Posted by harkes View Post
1.25 align with the performance of my car comparing it to other cars with similar power/weight. MAF 400 g/s

(incl driver)
My M135i: 1550kg, 500hp, 100-200 in ~7.6sec ±0.1 depending on weather
991 GT3 RS: 1500kg, 520hp, 100-200 in 7.6sec
458 Italia: 1600kg, 562hp, 100-200 in 7.5sec
1.25 is for engine HP, which no one in the US cares about, but with 1.1 X 400 that's 440whp - right in line with what a Pump PS2 should be.
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      10-18-2021, 01:23 PM   #70
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Yeah i think its a reasonable way to get an estimate, and i suppose you can look at your MAF curve to get an idea of the HP curve shape as well. Doesn't give you torque info, though. This also assumes that your MAF readings are accurate, so might want to take it with a grain of salt if you arent running stock intake.
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      10-18-2021, 04:10 PM   #71
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Quote:
Originally Posted by thejeremyman9 View Post
Yeah i think its a reasonable way to get an estimate, and i suppose you can look at your MAF curve to get an idea of the HP curve shape as well. Doesn't give you torque info, though. This also assumes that your MAF readings are accurate, so might want to take it with a grain of salt if you arent running stock intake.
MHD does have a measured torque reading as well right, you can map HP off that using RPM, right?
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      10-18-2021, 04:22 PM   #72
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Quote:
Originally Posted by AmuroRay View Post
MHD does have a measured torque reading as well right, you can map HP off that using RPM, right?
It does but I question that value. At one point it changed by a couple hundred with an app version update (not tune change). I looked at it a while back and it didnt seem totally unreasonable but it also seem inconsistent over time and when comparing logs on different cars.
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      10-18-2021, 04:50 PM   #73
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Quote:
Originally Posted by thejeremyman9 View Post
It does but I question that value. At one point it changed by a couple hundred with an app version update (not tune change). I looked at it a while back and it didnt seem totally unreasonable but it also seem inconsistent over time and when comparing logs on different cars.
Honestly, nothing short of Dyno time will probably suffice, but with the MAF measurement and torque scaling, we can probably get a good idea. And because MHD is load based, it's likely to be fairly consistent.
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      10-19-2021, 03:54 AM   #74
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400.8 g/s = 501 crank = 425 whp
407 clutch nm @ 6786rpm = 387.88 whp (I assume)

Yeah something seems off......
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      10-19-2021, 08:14 AM   #75
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Quote:
Originally Posted by harkes View Post
400.8 g/s = 501 crank = 425 whp
407 clutch nm @ 6786rpm = 387.88 whp (I assume)

Yeah something seems off......
Can you tell me what the measured torque is at 6300/6400/6500 RPM is? And what is the MAF reading 6700 would be near fuel cut I believe
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      10-19-2021, 11:22 AM   #76
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Quote:
Originally Posted by harkes View Post
400.8 g/s = 501 crank = 425 whp
407 clutch nm @ 6786rpm = 387.88 whp (I assume)

Yeah something seems off......
do you use XHP? or just MHD with 3rd and 6th gear correction?
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      10-19-2021, 12:53 PM   #77
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Quote:
Originally Posted by harkes View Post
400.8 g/s = 501 crank = 425 whp
407 clutch nm @ 6786rpm = 387.88 whp (I assume)

Yeah something seems off......
I also get way different values using MAF vs using torque from the logs converted to HP using RPM. I tried a few points.

6000rpm, i get 460hp from torque and 412 from MAF (using 1.25 for crank HP)

5000rpm i get 401hp from torque and 365 from MAF (using 1.25)

Not sure exactly what the torque parameter in the log is measuring (or how it is measuring), but wonder if it might be affected by torque converter or something.

Either way the MAF conversion seems more accurate.
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      10-19-2021, 07:21 PM   #78
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Quote:
Originally Posted by AmuroRay View Post
Can you tell me what the measured torque is at 6300/6400/6500 RPM is? And what is the MAF reading 6700 would be near fuel cut I believe
Here is the log

https://datazap.me/u/harkes/fabian-v...-5-12-15-19-30
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      10-19-2021, 07:33 PM   #79
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Another question: Has anyone see a PS2 log showing MAF values north of 500 g/s??? I always thought the 550whp PS2 was BS...
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      03-29-2022, 07:48 PM   #80
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Been using virtual dyno for the last week (I haven't created any new logs in more than a year) but my last recorded run was 382whp (smoothing 1) with over 360whp being carried to redline.

I tried to compare this to some of my older runs, and peak power is higher by about WHP 20WHP in the upper RPM range versus my prior logs before inlet & DV. I'll try to get some new ones with the CTS intake, but the issue is my logging cable doesn't work well.
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      04-02-2022, 04:09 PM   #81
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Quote:
Originally Posted by thejeremyman9 View Post

2. I think stock intake even with a drop in filter (which is what i am running) might become the choke point if you get a good inlet. So i might not see as much benefit as someone running an intake for example.
Did you ever do any pulls with the MPPK box and the MST V2 inlet?

Did the MPPK box hold up to the increased flow of the inlet, or is a true aftermarket intake required?

Last edited by terryd5150; 04-02-2022 at 04:19 PM..
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      04-02-2022, 05:06 PM   #82
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Quote:
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Did you ever do any pulls with the MPPK box and the MST V2 inlet?

Did the MPPK box hold up to the increased flow of the inlet, or is a true aftermarket intake required?
Yes, extensively tested. Read this thread starting around page 8: https://f30.bimmerpost.com/forums/sh...1656337&page=8

Then read this thread: https://f30.bimmerpost.com/forums/sh....php?t=1765289

MPPK+drop in filter + mst v2 is a fully optimized intake setup IMO. Negligible gains if any from intakes and the noise is annoying (again IMO). Even if an intake did add say 5hp i wouldnt run it due to noise.
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      04-02-2022, 05:37 PM   #83
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Quote:
Originally Posted by thejeremyman9 View Post
Yes, extensively tested. Read this thread starting around page 8: https://f30.bimmerpost.com/forums/sh...1656337&page=8

Then read this thread: https://f30.bimmerpost.com/forums/sh....php?t=1765289

MPPK+drop in filter + mst v2 is a fully optimized intake setup IMO. Negligible gains if any from intakes and the noise is annoying (again IMO). Even if an intake did add say 5hp i wouldnt run it due to noise.
I'm not interested in "tunerboi" noise either.
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      04-03-2022, 12:28 PM   #84
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Quote:
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I'm not interested in "tunerboi" noise either.
Y’all don’t like spooly boi noises?
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      04-03-2022, 12:44 PM   #85
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Quote:
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Y’all don’t like spooly boi noises?
I do, my 3000gt makes plenty of turbo noises on accel, decel, BOV/flutter, etc. But the intakes/DV on N55's just don't sound good IMO, too much vacuum cleaner noise and "squeal" and high pitched air noise from the DV. Totally different from 90s era turbo noises.
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      04-03-2022, 03:46 PM   #86
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Y’all don’t like spooly boi noises?
Nope (lol), but feel free to sign me up for the following:

* Heavily-cammed V8's

* The gear whine of a twin-screw supercharger

* The "jet engine"-like spool-up of a turbocharger

* Chambered exhausts

* I6's with a deep, throaty growl - as opposed to a wasp-like rasp

All of those tend to easily catch my ear.
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      04-04-2022, 05:04 AM   #87
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Quote:
Originally Posted by thejeremyman9 View Post
I do, my 3000gt makes plenty of turbo noises on accel, decel, BOV/flutter, etc. But the intakes/DV on N55's just don't sound good IMO, too much vacuum cleaner noise and "squeal" and high pitched air noise from the DV. Totally different from 90s era turbo noises.
I’m mostly teasing, but I agree. I now work from home permanently so I don’t really drive much anymore - and while I agree that modern Turbo cars lack character and sound, it doesn’t sound bad. My fiancée (without prompting) told me the car sounded good (with the new intake) when we were driving around.

My friend’s E30 M20B25 was one of my favorites, it had a very ‘smooth’ turbine like sound, reminded me of one of those old sewing machines. It wasn’t ‘throaty’ but it had a good bass to the system.

I had a Z3 with an M52TUB25 with a Super Sprint system - it was great, very bassy.

My n52 with a full headers, mid pipe, and BMW performance muffler was obnoxiously loud, wow. It was bassy, throaty but raspy - it sounded raw. It was not for me. Made almost 250whp NA though, which I think is still a record


It's slightly less obnoxious than this. Hated it.

Last edited by AmuroRay; 04-04-2022 at 04:57 PM..
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      04-04-2022, 05:09 PM   #88
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I've been trying to log a few different runs and seeing what these changes mean tangibly. I started with my own, but maybe we could make a thread of it?
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