981 BS mods and results
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Thread: 981 BS mods and results

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    981 BS mods and results

    I recently added the Cobb Stage 1 93 tune to my 2013 BS, which only had a Soul Valvetronic exhaust as a non-stock "performance" mod.

    The Soul exhaust is magnificent because you can turn the sound UP or DOWN using your HomeLink buttons. You can go from mild sound to wild sound just by pressing a button, like PSE except wilder.

    According to the Cobb maps, the Stage 1 93 tune adds about 27HP and 18 FP's to the Boxster S. The exhaust is a sound option, so no power gains are expected without headers.

    Historical data shows the 981 BS was originally rated by Porsche at 4.8 seconds in the 0-60 run, but 4.5/4.6 is probably more accurate, Porsche is not known to fudge this number.

    The Cobb tune & Soul exhaust combination produced an electronically timed 3.85 second 0-60 run in 70F sunshine today, with the top up. Put the top and windows down and the car slowed to 3.99 seconds.
    I really didn't expect to see 3's in the outcome. I would have been pleased with 4.0 to 4.2.

    Props to Cobb in concert with Soul for these results.
    (Sorry that I didn't capture baseline data.)
    2013 Boxster S, PDK, Sport Chrono, Cobb 93 tune, Soul Valvetronic exhaust, Schnell rear lower support bar, Schnell 7mm & 15mm spacers, Porsche center radiator, ... rear view camera may be next, or headers, yeah headers, that's the ticket.

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    Re: 981 BS mods and results

    That PDK is a hell of a drug... A MT would probably be half a second slower... lol
    2015 Cayman GTS
    Guards, 6MT, PSE, PTV, X73 SS, Carrera wheels, Bose, red dials, sport tailpipes, heated/cooled seats
    Fabspeed sport headers, BMC filters, Cobb Stage 2 tune, Numeric shifter

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    Re: 981 BS mods and results

    Not sure how you measured it but these cars don't really do sub-4 to 60. I've had a 4.2 to 62 mph but that was with 370 HP (race headers, pro tune - a lot quicker than what I measured with Cobb stage 1)
    and warmed up Cup 2 tires for the launch control to make the most of...

    https://www.youtube.com/watch?v=6kr-LE-sZbc
    2015 Cayman GTS
    2008 Audi RS4
    https://www.youtube.com/user/JCviggen1

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    Re: 981 BS mods and results

    Quote Originally Posted by JCviggen View Post
    Not sure how you measured it but these cars don't really do sub-4 to 60. .....
    The Accessport has a 0-60 timer built in, I used that with hot R-888's. YMMV, I can only report what I read.
    2013 Boxster S, PDK, Sport Chrono, Cobb 93 tune, Soul Valvetronic exhaust, Schnell rear lower support bar, Schnell 7mm & 15mm spacers, Porsche center radiator, ... rear view camera may be next, or headers, yeah headers, that's the ticket.

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    Re: 981 BS mods and results

    Quote Originally Posted by DFW View Post
    The Accessport has a 0-60 timer built in, I used that with hot R-888's. YMMV, I can only report what I read.
    Oh I see, yeah that one isn't accurate...a few years ago when I was testing I found the speed that the ECU "sees" to be a little weird. Like the OBD speed even runs ahead of the digital speedometer (more and more the faster you go) and it's quite optimistic. I can see how you would get a few tenths ahead that way.
    2015 Cayman GTS
    2008 Audi RS4
    https://www.youtube.com/user/JCviggen1

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    Re: 981 BS mods and results

    Quote Originally Posted by JCviggen View Post
    Oh I see, yeah that one isn't accurate....... I can see how you would get a few tenths ahead that way.
    Okay, so let's say that "a few" is 3 tenths (as a couple is 2 and several is 4) ... if the actual time is 4.1 to 4.2, I'm very happy with the money that I spent.
    And as proof to me, I beat my previous personal best at COTA this weekend by 5 seconds +, despite sub-prime tires.
    2013 Boxster S, PDK, Sport Chrono, Cobb 93 tune, Soul Valvetronic exhaust, Schnell rear lower support bar, Schnell 7mm & 15mm spacers, Porsche center radiator, ... rear view camera may be next, or headers, yeah headers, that's the ticket.

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    Re: 981 BS mods and results

    I wasn't going to comment,but since JC did....

    My PDK Cayman X51 3.8 with dyno'ed 372 HP has only done 0-60 MPH in 4.0 seconds as measured by a VBOX Sport. You cannot trust the car's on-board data, only a GPS-based speed measuring tool is sufficient and in GPS tools, most sample at 10 times per second. The VBOX Sport samples at 20 times per second, resulting in accurate measurements to 1/20th of a second.

    One reason the car's data can't be trusted is the tire settings in the instrument panel and those actually on the car are not a perfect match. The other reason is the lag in transmitting the data over the car's internal data buses. Finally, the factory anticipates some data when accelerating hard and actual values don't quite match.

    Tread wear can affect car on-board data up to 0.09 seconds, and tire air pressure as well. GPS removes all these variables.

    V6
    Last edited by Voyager6; 03-18-2019 at 07:22 AM.

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    Re: 981 BS mods and results

    Quote Originally Posted by DFW View Post
    The Cobb tune & Soul exhaust combination produced an electronically timed 3.85 second 0-60 run in 70F sunshine today, with the top up. Put the top and windows down and the car slowed to 3.99 seconds.
    Was that a Launch Control run?
    2014 Boxster S - Racing Yellow, Sport Chrono, PASM, PTV, PDK, 3rd radiator, Cobb Stage 1 tune (Pagid RSL29's & Nitto NT-01's on the track)

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    Quote Originally Posted by DFW View Post
    Quote Originally Posted by JCviggen View Post
    Oh I see, yeah that one isn't accurate....... I can see how you would get a few tenths ahead that way.
    Okay, so let's say that "a few" is 3 tenths (as a couple is 2 and several is 4) ... if the actual time is 4.1 to 4.2, I'm very happy with the money that I spent.
    And as proof to me, I beat my previous personal best at COTA this weekend by 5 seconds +, despite sub-prime tires.
    As JC stated, 0 to 60 times from the accessport are highly inaccurate. The slightest amount of tire slippage on start or gearshift will cause the values to be completely wrong and very optimistic. I can pull GT3 0 to 60 times using my access port under the right conditions.

    Mathematically it would take at least 400 HP to produce the times you have posted, however with that being said I am with you in the fact that there’s no denying the fun factor in there is definitely a performance gain that can be felt and enjoyed, and at the end of the day that’s all that matters to me!

    It’s crazy to think that even the four second and change times that these cars are able to achieve right off the dealer lot were super car values just a few years ago.
    Last edited by ICNU; 03-18-2019 at 08:28 PM.

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    Re: 981 BS mods and results

    Quote Originally Posted by DFW View Post
    Okay, so let's say that "a few" is 3 tenths (as a couple is 2 and several is 4) ... if the actual time is 4.1 to 4.2, I'm very happy with the money that I spent.
    And as proof to me, I beat my previous personal best at COTA this weekend by 5 seconds +, despite sub-prime tires.
    DFW,

    Where your Accessport is useful is in comparative before/after results. A better after number relative to before number is useful information.

    V6

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    Re: 981 BS mods and results

    It's been many decades since I've been into drag racing, but one thing I discovered is that new, unmodified cars could have a half second difference in 1/4 mile times. This would be for the same model, same tires, same driver, and no more than a few hundred mile difference on the odometers. When my 981S was about six months old, I was able to get a best time of 4.3 in 0-60 and 12.7 in the 1/4. That was my best time after many passes, experimenting with different launch rpms. Replacing the OEM tires with slick should easily reduce those times by a couple of tenths.

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    Re: 981 BS mods and results

    Quote Originally Posted by Voyager6 View Post
    DFW,

    Where your Accessport is useful is in comparative before/after results. A better after number relative to before number is useful information.

    V6
    You're 100% correct and I'm ashamed (shame may be a bit strong) that I didn't gather baseline (pre-Cobb Accessport data). If I have time this weekend, I will delete the Cobb tune and run the same road as a post mod reversion test.
    2013 Boxster S, PDK, Sport Chrono, Cobb 93 tune, Soul Valvetronic exhaust, Schnell rear lower support bar, Schnell 7mm & 15mm spacers, Porsche center radiator, ... rear view camera may be next, or headers, yeah headers, that's the ticket.

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    Re: 981 BS mods and results

    Quote Originally Posted by DFW View Post
    You're 100% correct and I'm ashamed (shame may be a bit strong) that I didn't gather baseline (pre-Cobb Accessport data). If I have time this weekend, I will delete the Cobb tune and run the same road as a post mod reversion test.
    No need for shame, just post your results with the stock factory tune and all will be forgiven. I'm interested to see what A-to-B gains you observe just from software alone, but you'll probably want to run the Cobb tune runs again too (on the same day, same road, same conditions, etc.) for the most accurate comparison so that the effects of temperature, tire wear, how much fuel was in tank, etc. can be ruled out.
    2015 Porsche Boxster GTS
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