Dundon "Making the 718 GT4 Faster"
11-02-2020, 08:31 PM
#76
Burning Brakes
Maybe retest both cars on the same day together, and see what happens?
Any pictures of the parts on the car? Is there a need for some heat shielding around the cat which gets hotter than a GPF?
Any pictures of the parts on the car? Is there a need for some heat shielding around the cat which gets hotter than a GPF?
Last edited by lovetoturn; 11-02-2020 at 08:33 PM.
11-02-2020, 10:10 PM
#77
Rennlist Member
. The OPF sensors are just differential pressure, so when the ECU senses pressure drop across the OPF it will know to do a cleaning cycle. We're working on a solution for the 991.3 GT3RS and Speedster (and soon to be 992 GT3). That ECU adds an EGT sensor.
This is honestly why we only worry with WHP on our own dyno. We know how it was controlled, we keep the cars in rolling road mode with a PIWIS so the car knows it's on a dyno (no all wheel drive dynos driving the front wheels etc...), we monitor the Intake Air Temps, atmospheric pressure etc... And as important we have a library of Porsche GT cars run on the same dyno under similarly controlled conditions going all the way back to the 996 GT3. It is interesting to see the SAE standards change over the years and how a 444hp 997.2 GT3RS and a 468 hp 991.1 GT3 both make the same power on our dyno...
Once the development is finished, I agree that getting 1/4mile traps or 60-130 is a good indicator of the power, just have to get a lot of them as there is definitely some technique required to make them consistent.
This is honestly why we only worry with WHP on our own dyno. We know how it was controlled, we keep the cars in rolling road mode with a PIWIS so the car knows it's on a dyno (no all wheel drive dynos driving the front wheels etc...), we monitor the Intake Air Temps, atmospheric pressure etc... And as important we have a library of Porsche GT cars run on the same dyno under similarly controlled conditions going all the way back to the 996 GT3. It is interesting to see the SAE standards change over the years and how a 444hp 997.2 GT3RS and a 468 hp 991.1 GT3 both make the same power on our dyno...
Once the development is finished, I agree that getting 1/4mile traps or 60-130 is a good indicator of the power, just have to get a lot of them as there is definitely some technique required to make them consistent.
11-02-2020, 11:01 PM
#78
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
11-03-2020, 12:30 AM
#80
Rennlist Member
SAE changes their certification requirements for OEM's to say what the power of an engine is. For a while it was sea level elevation for example, now it may be higher elevation where a NA engine will make less power but at sea level It makes more. We showing the engine making more than the "accepted" 15% drive train loss (which is kind of bull...). Hence the reason we compare them against one another using the WHP and wLBFT measurements we have on our dyno.
11-03-2020, 12:58 PM
#81
Banned
SAE changes their certification requirements for OEM's to say what the power of an engine is. For a while it was sea level elevation for example, now it may be higher elevation where a NA engine will make less power but at sea level It makes more. We showing the engine making more than the "accepted" 15% drive train loss (which is kind of bull...). Hence the reason we compare them against one another using the WHP and wLBFT measurements we have on our dyno
We control things tightly and doing on the same car is ideal as there is car to car variation as well. There isn't as the Cat is the same distance from the tire as our 991 GT3/GT3RS street header setup and there have been exactly ZERO issues...
Yes possible but the rpm range is pretty restricted...
We control things tightly and doing on the same car is ideal as there is car to car variation as well. There isn't as the Cat is the same distance from the tire as our 991 GT3/GT3RS street header setup and there have been exactly ZERO issues...
Yes possible but the rpm range is pretty restricted...
11-03-2020, 01:29 PM
#82
we just need a 100-200 time now.
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11-05-2020, 10:24 PM
#85
11-09-2020, 09:25 PM
#86
Deleted. Wrong guys. My bad.
Thanks Renn.
Thanks Renn.
Last edited by rooster17; 11-09-2020 at 09:35 PM.
The following users liked this post:
Rennolazine (11-09-2020)
11-09-2020, 09:33 PM
#87
Rennlist Member
Wrong guys 
11-09-2020, 09:40 PM
#88
Rennlist Member
^ Awesome driving! He could have passed them all with a Spec Boxster, too.
11-18-2020, 11:16 PM
#90
Are there additional gains to be had with a different muffler? Is that in the works?
How does the sound level compare to your 991 GT3 street headers paired with OE center muffler? Similar sound volume? I assume the 718 muffler reduces volume more than the 991 center muffler since the 991 OE setup also relies on side mufflers to do some work whereas the 718 doesn't have a true side muffler.
How does the sound level compare to your 991 GT3 street headers paired with OE center muffler? Similar sound volume? I assume the 718 muffler reduces volume more than the 991 center muffler since the 991 OE setup also relies on side mufflers to do some work whereas the 718 doesn't have a true side muffler.