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      05-05-2023, 12:40 PM   #1
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..::PSI::.. - PSI G87 M2 Midpipe Release! (Dyno Runs & Acceleration Sound Clip)

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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

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      05-05-2023, 12:56 PM   #2
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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.
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      05-05-2023, 07:59 PM   #3
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Looks and sounds good. Thanks for continuing to keep the community updated.
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      05-16-2023, 12:11 PM   #4
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Why does new software mean lower horsepower readings?

Did a quick google search and didnít find anything.
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      05-16-2023, 12:42 PM   #5
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Damn I was gonna go single sided midpipe because thatís what I run on my G80 but man this sounds great
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      05-16-2023, 07:52 PM   #6
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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?
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      05-16-2023, 09:05 PM   #7
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Quote:
Originally Posted by Bumpinjeep View Post
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.
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      05-16-2023, 10:30 PM   #8
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Quote:
Originally Posted by Squidget View Post
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.
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      05-16-2023, 10:49 PM   #9
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Quote:
Originally Posted by Bumpinjeep View Post
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.
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      05-16-2023, 11:29 PM   #10
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Can we stop with the high school pop/bangs?
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      05-17-2023, 03:07 AM   #11
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Quote:
Originally Posted by mattssi View Post
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.
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      05-17-2023, 03:14 AM   #12
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Quote:
Originally Posted by Game View Post
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.
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      05-17-2023, 08:46 AM   #13
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Can someone make a G30 B58 mid-pipe? please?
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      05-17-2023, 09:05 AM   #14
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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
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      05-17-2023, 09:27 AM   #15
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Sounds great! Anyone know if the stock system is equal length?
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      05-17-2023, 09:55 AM   #16
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Is there a single resonator removed or are there 2?
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      05-17-2023, 11:14 AM   #17
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Quote:
Originally Posted by Squidget View Post
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.
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      05-18-2023, 10:52 AM   #18
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Quote:
Originally Posted by Kevin_The_Clean1 View Post
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?
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      05-18-2023, 11:47 AM   #19
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Quote:
Originally Posted by Kevin_The_Clean1 View Post
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
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