Upgrade $8k DUNDON 93mm plenum throttle body and air filter box?
08-03-2022, 08:31 AM
#106
This is correct. 991.1 GT3, 991.2 GT3 and 991.2 GT3RS do not require a tune. All adapt wonderfully on their own. This is due to porsche using a manifold pressure based load measurement and accommodating ram air in the calibration.
The 991.1 GT3RS needs a tune only because it gets confused on cold start idle, and thinks with the throttle being more closed than stock that there is a manifold leak.
We have 100’s of these intake kits in the world making power, faster 100-200/60-130 times and almost all of them do not have a tune….
If you’d like a tune that’s awesome, there’s a little more to get with it, more so on the 991.2 Gt3 and Touring as they were detuned from the factory…
The 991.1 GT3RS needs a tune only because it gets confused on cold start idle, and thinks with the throttle being more closed than stock that there is a manifold leak.
We have 100’s of these intake kits in the world making power, faster 100-200/60-130 times and almost all of them do not have a tune….
If you’d like a tune that’s awesome, there’s a little more to get with it, more so on the 991.2 Gt3 and Touring as they were detuned from the factory…
10-11-2022, 10:05 AM
#107
Same setup.
I'm following this question. I just installed the complete D3 power package on my 991.2 3RS which includes plenum, throttle, intake, headers and exhaust. I've had no issues with codes, engine idle or anything. It is taking a little bit for the car to adapt as you will initially feel some flat spots in the throttle and rpm range but every time I drive it, it gets better. I am interested if others are doing a tune with the 991.2 and what advantage that brings.
Last edited by Gbachi; 10-11-2022 at 10:06 AM.
10-11-2022, 11:29 AM
#108
Originally Posted by Gbachi
Hey, I have done identical setup on my 991.2 GT3RS. And I have ECU tune. The car with Dundon exhaust runs 100-200 @ 7.55-7.75 For some reason, however once I install the complete D3 intake/throttle/filter Package, it runs 1 sec slower. We have reinstalled it several times. Struggling to understand whats the reason. Jamie is very responsive, but we werent able to resolve this one. Did you measure the improvement in your 100-200 (or 60-120/130mph) kph times?
10-11-2022, 02:24 PM
#109
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Something must be off based on my seat of the pants experience. I put 1,000 miles on my car two weeks ago, and the big difference I noticed (seat of the pants and feedback from guys I drive with a lot) is that my .2 with the whole power package is simply faster coming out of corners than it used to be. If I had been asked where I really noticed the additional power, I would have said 50-120MPH. Hopefully Jamie can help get you sorted out. Wish I had something more concrete to share with you. (no tune on my car).
10-15-2022, 10:15 PM
#110
This is a fantastic thread. I watched the Obsessed Garage video visit to Dundon, which was also a great watch.
Jamie, specifically asking about the 991.2 GT3 6MT, for example a 2018 model:
1) Do the air intakes make a noticeable ‘ram air’ effect? How much pressure difference is seen compared with the Touring model? I do know that the air box is different between the two models, perhaps to account for the lack of air scoops in the Touring model?
2) What is the limiting factor in the 991.2 GT3 6MT winged model’s intake/exhaust system?
Jamie, specifically asking about the 991.2 GT3 6MT, for example a 2018 model:
1) Do the air intakes make a noticeable ‘ram air’ effect? How much pressure difference is seen compared with the Touring model? I do know that the air box is different between the two models, perhaps to account for the lack of air scoops in the Touring model?
2) What is the limiting factor in the 991.2 GT3 6MT winged model’s intake/exhaust system?
10-18-2022, 10:30 PM
#111
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This is a fantastic thread. I watched the Obsessed Garage video visit to Dundon, which was also a great watch.
Jamie, specifically asking about the 991.2 GT3 6MT, for example a 2018 model:
1) Do the air intakes make a noticeable ‘ram air’ effect? How much pressure difference is seen compared with the Touring model? I do know that the air box is different between the two models, perhaps to account for the lack of air scoops in the Touring model?
2) What is the limiting factor in the 991.2 GT3 6MT winged model’s intake/exhaust system?
Jamie, specifically asking about the 991.2 GT3 6MT, for example a 2018 model:
1) Do the air intakes make a noticeable ‘ram air’ effect? How much pressure difference is seen compared with the Touring model? I do know that the air box is different between the two models, perhaps to account for the lack of air scoops in the Touring model?
2) What is the limiting factor in the 991.2 GT3 6MT winged model’s intake/exhaust system?
Making the filter area as large as possible to keep the air slow (everytime it has to speed up it loses pressure) is one key. Making the opening large and bends smooth is another.
To answer your question the 991.2 does have good Ram air from the scoops.
Sucking the air out with a good header design and allowing the pressure to build over the intake valve is key to power in any NA engine.
The D3 kit and a tune get the 991.2 GT3 very close to the D3 RS numbers. The 991.2 GT3 is the same engine as the RS but different tunes, so there is something to be gained there.
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
09-11-2023, 10:17 PM
#114
I posted data somewhere with 60-100mph and 60-130mph runs before the Dundon Intake upgrade and after, my car equipped with the Dundon Quiet muffler and the Dundon headers.
Where the car gains are truly noticeable are from 6000rpm to 9000rpm. Normal driving with the new intake would not change, and the intake noise from the side entries is reduced a bit. But a high RPMs the thing performs amazingly well.
When I tested, I benchmarked against my 991.1 Turbo S that had a lot of upgrades, pushing anywhere from 640hp to over 700hp depending on which tune I was running. On the 640Hp tune (93 octane off the shelve Cobb + Inconel headers + Inconel Muffler + No Cats + IPD TB + IPD Y-pipe + IC), the GT3RS from a roll (running a Vbox and a draggy) would beat the Turbo S from 60-100, and only the 60-130 will the Turbo S get ahead by very little. I would run these tests from 30mph in 2nd gear and commit to full throttle, then extract the data at my office to compare. Same roads and same days.
Without doubt, the best performance upgrade to make power in a 991 GT3 is the whole intake/exhaust Dundon system. No ECU tune needed, no Check Engine Lights, awesome sound, and vastly better acceleration. At my local track (PBIR) I had no problems walking away in straight line from modified C7-Z06, AMG GTR, Nissan GTR at the back straight.
If there were tens of thousands of 991 GT3s out there, Dundon could offset the R&D costs into more production units and set the price lower. The Dundon upgrades are worth every penny, I see a lot of modifications that carry a similar price tag and add little (wheels + paint correction + paint protection as an example).
Maybe, have Jamie setup a Group By once a year around the holidays for these awesome parts.
Where the car gains are truly noticeable are from 6000rpm to 9000rpm. Normal driving with the new intake would not change, and the intake noise from the side entries is reduced a bit. But a high RPMs the thing performs amazingly well.
When I tested, I benchmarked against my 991.1 Turbo S that had a lot of upgrades, pushing anywhere from 640hp to over 700hp depending on which tune I was running. On the 640Hp tune (93 octane off the shelve Cobb + Inconel headers + Inconel Muffler + No Cats + IPD TB + IPD Y-pipe + IC), the GT3RS from a roll (running a Vbox and a draggy) would beat the Turbo S from 60-100, and only the 60-130 will the Turbo S get ahead by very little. I would run these tests from 30mph in 2nd gear and commit to full throttle, then extract the data at my office to compare. Same roads and same days.
Without doubt, the best performance upgrade to make power in a 991 GT3 is the whole intake/exhaust Dundon system. No ECU tune needed, no Check Engine Lights, awesome sound, and vastly better acceleration. At my local track (PBIR) I had no problems walking away in straight line from modified C7-Z06, AMG GTR, Nissan GTR at the back straight.
If there were tens of thousands of 991 GT3s out there, Dundon could offset the R&D costs into more production units and set the price lower. The Dundon upgrades are worth every penny, I see a lot of modifications that carry a similar price tag and add little (wheels + paint correction + paint protection as an example).
Maybe, have Jamie setup a Group By once a year around the holidays for these awesome parts.
Thank you
09-19-2023, 12:48 PM
#115
09-19-2023, 12:57 PM
#116
Jamie I know you already replied in detail but two more questions
- Did you ever measure on the dyno or on street or track the AFR / lambda 02 values between a 991.2 GT3 RS stock and one fitted with the Dundon complete air intake kit and no tune ? Would they be exactle the same or could it be any leaner in some conditions ?
- Is the intake noise much different with the Dundon intake but stock exhaust fitted or similar to stock ?
Thanks
- Did you ever measure on the dyno or on street or track the AFR / lambda 02 values between a 991.2 GT3 RS stock and one fitted with the Dundon complete air intake kit and no tune ? Would they be exactle the same or could it be any leaner in some conditions ?
- Is the intake noise much different with the Dundon intake but stock exhaust fitted or similar to stock ?
Thanks
09-23-2023, 05:12 AM
#117
