..::PSI::.. - PSI G87 M2 Midpipe Release! (Dyno Runs & Acceleration Sound Clip)

Sean@PSI · 05-05-2023, 01:40 PM

Featured on BIMMERPOST.com

Updated with sound clip:
https://www.youtube.com/shorts/huYBs30kBmk

As promised, today is Friday and our PSI G87 M2 Dyno/Sound clip video is out! We will be posting more videos within the next week highlighting the sound even further to help you all hear exactly how good this car sounds in person.

https://precision-sport.com/products...7&_ss=e&_v=1.0

M_Tune · 05-05-2023, 01:56 PM

I am thinking it may be good to put the car back on the Dyno in a week’s timeframe and see if the engine compensate and trims the output. Some stock tunes are notorious for doing this; I am looking at you VAG.

Game · 05-05-2023, 08:59 PM

Looks and sounds good. Thanks for continuing to keep the community updated.

bwdev · 05-16-2023, 01:11 PM

Why does new software mean lower horsepower readings?

Did a quick google search and didn’t find anything.

Tuxon_Speed · 05-16-2023, 01:42 PM

Damn I was gonna go single sided midpipe because that’s what I run on my G80 but man this sounds great

Bumpinjeep · 05-16-2023, 08:52 PM

447 whp
396 wtq
And there's a 10% loss in those numbers?
So that's like 492 whp and 436 wtq? Are these crank numbers? Because 492 whp is what like 541 hp at the crank if we do a 10% drop. That can't be right can it?

Squidget · 05-16-2023, 10:05 PM

Quote:

Originally Posted by Bumpinjeep

447 whp
396 wtq
And there's a 10% loss in those numbers?
So that's like 492 whp and 436 wtq? Are these crank numbers? Because 492 whp is what like 541 hp at the crank if we do a 10% drop. That can't be right can it?

They are measuring on a standard dyno, so I'm assuming that's WHP. I doubt they pulled the engine and put it on an engine dyno.

447 WHP sounds similar to at least one other dyno run I've seen, implying that CHP is around 490-500-ish.

Bumpinjeep · 05-16-2023, 11:30 PM

Quote:

Originally Posted by Squidget

They are measuring on a standard dyno, so I'm assuming that's WHP. I doubt they pulled the engine and put it on an engine dyno.

447 WHP sounds similar to at least one other dyno run I've seen, implying that CHP is around 490-500-ish.

Yeah but they stated that it reads roughly 10% under what it should, so that 500 figure is closer to 550. Pretty intense. Can't wait to break mine in.

Squidget · 05-16-2023, 11:49 PM

Quote:

Originally Posted by Bumpinjeep

Yeah but they stated that it reads roughly 10% under what it should, so that 500 figure is closer to 550. Pretty intense. Can't wait to break mine in.

Feels wrong to me, doesn't line up with other dynos I've seen. But I won't complain if it turns out to be true.

mattssi · 05-17-2023, 12:29 AM

Can we stop with the high school pop/bangs?

Kevin_The_Clean1 · 05-17-2023, 04:07 AM

Quote:

Originally Posted by mattssi

Can we stop with the high school pop/bangs?

I heard none of that here, so have no clue what you're talking about in this thread. The overrun pops & bangs are usually in the tuning & sometimes amplified in the muffler design.

Kevin_The_Clean1 · 05-17-2023, 04:14 AM

Quote:

Originally Posted by Game

Looks and sounds good. Thanks for continuing to keep the community updated.

I full agree on both statements. This really gives a great deal more volume to the already nice sounding G87 exhaust. And it looks high quality as well. Like a system that will age well after burnin process down the road is complete.

Simply wish you made an identical X-pipe for me X3 M Comp. Not just the single flow design you have available now. I much prefer both the smooth yet aggressive sound & looks of this.

Wonder what a one-off might cost me.

G30 B58 · 05-17-2023, 09:46 AM

Can someone make a G30 B58 mid-pipe? please?

supershaft · 05-17-2023, 10:05 AM

car sounds so much better but he lost me when he said there will be more HP after breakin. LOL

EDIT: they should post SAE correction and not set the smoothing so high. anything above 3 is really suspect

Rat_House · 05-17-2023, 10:27 AM

Sounds great! Anyone know if the stock system is equal length?

ourlee · 05-17-2023, 10:55 AM

Is there a single resonator removed or are there 2?

Bumpinjeep · 05-17-2023, 12:14 PM

Quote:

Originally Posted by Squidget

Feels wrong to me, doesn't line up with other dynos I've seen. But I won't complain if it turns out to be true.

465 WHP on IND's dyno https://g87.bimmerpost.com/forums/sh...highlight=Dyno

470 WHP on a different dyno
https://g87.bimmerpost.com/forums/sh...highlight=Dyno

If we figure a 15% loss, well there's that 550 crank horsepower. Hell even at 500 crank horsepower, that's still a ton and more than enough to enjoy. This car is shaping up to be a really fun one.

Cruise'n · 05-18-2023, 11:52 AM

Quote:

Originally Posted by Kevin_The_Clean1

I heard none of that here, so have no clue what you're talking about in this thread. The overrun pops & bangs are usually in the tuning & sometimes amplified in the muffler design.

The first clip when it drive off, was horrible.
Was thinking of doing this with a S68 V8 but would be devastated if sounded like that.

Is there a way to get more volume without the cheap pops that 99% of people on the streets don't like?

Don't know what the technical name but we used to call a HOTDOG mounted in reverse. Would this help?

DivergedM2 · 05-18-2023, 12:47 PM

Quote:

Originally Posted by Kevin_The_Clean1

I heard none of that here, so have no clue what you're talking about in this thread. The overrun pops & bangs are usually in the tuning & sometimes amplified in the muffler design.

True, I don't know about active sound but when I tuned my last M2 via BM3 I could turn *down the pops...as opposed to the machine guns at my local c&c's

Ravenseal · 07-21-2023, 03:57 AM

Anyone have this on their car yet?

Ravenseal · 07-21-2023, 11:19 AM

Sean@PSI Since your mid pipe is non-resonated, does it introduce any drone with the exhaust system in the quietest mode/setting (valves closed)?

05-05-2023, 01:40 PM	#1
Sean@PSI 2429 Rep 5,019 Posts Drives: 2021 IOMG M3 Sedan Join Date: Feb 2009 Location: Oviedo, FL iTrader: (0)	..::PSI::.. - PSI G87 M2 Midpipe Release! (Dyno Runs & Acceleration Sound Clip) Featured on BIMMERPOST.com Updated with sound clip: https://www.youtube.com/shorts/huYBs30kBmk As promised, today is Friday and our PSI G87 M2 Dyno/Sound clip video is out! We will be posting more videos within the next week highlighting the sound even further to help you all hear exactly how good this car sounds in person. https://precision-sport.com/products...7&_ss=e&_v=1.0
	Appreciate 15 zero213276.00 ronin130131076.00 Game8148.00 D22M21425.50 ESB1317.00 atl_1M1522.50 02M3ForMe4347.00 Ethans68314.00 2srsman93.00 werdn711.50 M3 boi3220.00 Tenac4812.00 mblaucoupe135300.50 AlpineBoost3934.50 ourlee1565.50 Tweet Quote

05-05-2023, 01:56 PM	#2
M_Tune Enlisted Member 74 Rep 46 Posts Drives: Red Bull RB19 Join Date: Jan 2023 Location: Canada iTrader: (0)	I am thinking it may be good to put the car back on the Dyno in a week’s timeframe and see if the engine compensate and trims the output. Some stock tunes are notorious for doing this; I am looking at you VAG.
	Appreciate 2 forcefed3317.50 Threeebowel31.50 Quote

05-05-2023, 08:59 PM	#3
Game ------ 8148 Rep 10,621 Posts Drives: G80 LCI, G87 (sold) Join Date: Aug 2010 Location: Chicago'ish iTrader: (25)	Looks and sounds good. Thanks for continuing to keep the community updated. __________________
	Appreciate 2 Kevin_The_Clean14225.50 AlpineBoost3934.50 Quote

05-16-2023, 01:11 PM	#4
bwdev Registered 9 Rep 4 Posts Drives: Chevy Volt Join Date: Feb 2023 Location: Indiana iTrader: (0)	Why does new software mean lower horsepower readings? Did a quick google search and didn’t find anything.
	Appreciate 2 zero213276.00 Squidget3823.50 Quote

05-16-2023, 01:42 PM	#5
Tuxon_Speed Private First Class 641 Rep 166 Posts Drives: 2023 M3 COMP XDRIVE Join Date: Jan 2023 Location: Tucson, AZ iTrader: (0) Garage List 2023 BMW M3 Competi ... [0.00]	Damn I was gonna go single sided midpipe because that’s what I run on my G80 but man this sounds great
	Appreciate 2 ronin130131076.00 zero213276.00 Quote

05-16-2023, 08:52 PM	#6
Bumpinjeep Colonel 6256 Rep 2,552 Posts Drives: 2023 M2 Join Date: Mar 2017 Location: Redmond, WA iTrader: (0) Garage List 2023 M2 [8.33]	447 whp 396 wtq And there's a 10% loss in those numbers? So that's like 492 whp and 436 wtq? Are these crank numbers? Because 492 whp is what like 541 hp at the crank if we do a 10% drop. That can't be right can it? __________________ Present BMW: 2023 M2 BSM W/Carbon everything, 6 Speed Past BMWs: 2020 M2C HS Executive, 6 Speed 2017 M3 YMB Executive, 6 Speed, ZCP Everything else: 2024 Wrangler 4Xe 2020 MK 7.5 GTI
	Appreciate 0 Quote

05-17-2023, 12:29 AM	#10
mattssi Major 930 Rep 1,407 Posts Drives: 2019 X3 Join Date: Sep 2006 Location: Bend, OR iTrader: (1)	Can we stop with the high school pop/bangs? __________________ 2021 ///M3 2019 X3
	Appreciate 4 edwinm31000.50 supershaft922.00 CHSe92253.00 Cruise'n75.50 Quote

05-17-2023, 09:46 AM	#13
G30 B58 Pace Car Driver 1594 Rep 3,179 Posts Drives: '22 AW G30 B58 M-Sport Join Date: May 2014 Location: my garage in PA iTrader: (0)	Can someone make a G30 B58 mid-pipe? please?
	Appreciate 0 Quote

05-17-2023, 10:05 AM	#14
supershaft Captain 922 Rep 625 Posts Drives: 750s, Cayenne Turbo Join Date: Mar 2013 Location: nj iTrader: (0)	car sounds so much better but he lost me when he said there will be more HP after breakin. LOL EDIT: they should post SAE correction and not set the smoothing so high. anything above 3 is really suspect
	Appreciate 0 Quote

05-17-2023, 10:27 AM	#15
Rat_House First Lieutenant 227 Rep 372 Posts Drives: M2 Comp, Gated R8, DatsunZ, mk Join Date: May 2013 Location: Stamford, CT iTrader: (2)	Sounds great! Anyone know if the stock system is equal length?
	Appreciate 0 Quote

05-17-2023, 10:55 AM	#16
ourlee Lieutenant Colonel 1566 Rep 1,530 Posts Drives: WTB your comfort seats Join Date: Nov 2015 Location: Vista View Apartments iTrader: (0)	Is there a single resonator removed or are there 2?
	Appreciate 1 Cruise'n75.50 Quote

07-21-2023, 03:57 AM	#20
Ravenseal Lieutenant Colonel 3094 Rep 1,897 Posts Drives: 2023 M2 6MT Join Date: Jan 2016 Location: Denver iTrader: (0)	Anyone have this on their car yet?
	Appreciate 0 Quote

07-21-2023, 11:19 AM	#21
Ravenseal Lieutenant Colonel 3094 Rep 1,897 Posts Drives: 2023 M2 6MT Join Date: Jan 2016 Location: Denver iTrader: (0)	Sean@PSI Since your mid pipe is non-resonated, does it introduce any drone with the exhaust system in the quietest mode/setting (valves closed)? __________________ 2023 G87 M2 - Toronto Red \| 6MT \| M HAS \| CF Roof \| BMW 826M Forged Wheels \| Mishimoto Skid Plate \| Active Autowerks Single Midpipe Retired: 2022 M240i xDrive \| 2021 Audi RS5 \| 2019 Camaro 2SS 1LE 6MT \| 2016 428i GC \| 2011 BMW 335is
	Appreciate 1 uk0168573.50 Quote