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I can only post what I see with the tools I have available. I don't have a "PORSCHE" measuring stick to use for comparison purposes. I use a Dyna Pack Dyno, so I can build a data base of baseline for HP and TQ from some of the best cars Porsche has produced in stock form. From there we can compare to Factory stated numbers and extrapolate a comparison.
I prefer to build a data base of stock Benchmark cars like the 2019 991.2 GT3RS that I have attached below to compare my modified cars against. The GT3 RS did exactly what the factory claimed for HP at 520 but the TQ is a bit higher on MY MEASURING STICK, so that's what I go with.
I'll compare the 4.5L Spyder to the 991.2 GT3RS on MY dyno tool and show the results as found for comparative purposes. Comparison of this data to any other data outside this control set is useless.
Below is the 991.2 GT3RS and below that is the 4.5L Spyder my Dog Tony was singing to this morning.
Still having a hard time swallowing the idea of 100 lb-ft per liter from an NA motor. I have been very curious for some time about what were the limits of NA torque production, and about 90 lb-ft/lier is the absolute maximum I could find anywhere for the theoretical limit, prior to this posting. Is there some breakthrough engine design tech here?
Still having a hard time swallowing the idea of 100 lb-ft per liter from an NA motor. I have been very curious for some time about what were the limits of NA torque production, and about 90 lb-ft/lier is the absolute maximum I could find anywhere for the theoretical limit, prior to this posting. Is there some breakthrough engine design tech here?
Still having a hard time swallowing the idea of 100 lb-ft per liter from an NA motor. I have been very curious for some time about what were the limits of NA torque production, and about 90 lb-ft/lier is the absolute maximum I could find anywhere for the theoretical limit, prior to this posting. Is there some breakthrough engine design tech here?
Are you factoring in the use of 98 octane (93 pump + can of octane boost)?
All I know is that a 3rd gear pull in one of these, from a very slow roll, starting at the bottom of a 6%+ hill, felt faster than a 1st gear pull on a flat, in my stock 981.
All I know is that a 3rd gear pull in one of these, from a very slow roll, starting at the bottom of a 6%+ hill, felt faster than a 1st gear pull on a flat, in my stock 981.
Are you factoring in the use of 98 octane (93 pump + can of octane boost)?
All I know is that a 3rd gear pull in one of these, from a very slow roll, starting at the bottom of a 6%+ hill, felt faster than a 1st gear pull on a flat, in my stock 981.
Wait, what! How did I miss that this engine requires 98 Octane fuel?
Originally Posted by Rick DeMan
The 718 4.5L cars run on 93 Pump gas as well as the 981 4.5L cars.
Here is the thing...
If you run track days, extended heavy throttle street use, drag racing your friends, Instagram burnouts, redline running or general Tom Foolery, It needs some high quality higher octane fuel to keep it happy and safe.
Rick, so which is it then, referencing the graphs above is this on 93 Octane pump gas or a boosted fuel? Further, what is your definition of high quality higher octane fuel, what should the sticker inside the fuel filler door read for your 4.5l engine?
Wait, what! How did I miss that this engine requires 98 Octane fuel?
Rick, so which is it then, referencing the graphs above is this on 93 Octane pump gas or a boosted fuel? Further, what is your definition of high quality higher octane fuel, what should the sticker inside the fuel filler door read for your 4.5l engine?
This 718 Spyder is running on 93 east coast fuel!!
Please don't confuse the results/comments/info from 981 cars to the 718. They are completely different in the care, feeding and performance personalities.
ALL 718 cars are tuned on 93 east coast octane. West coast cars are tuned for 91
The 981 cars are tuned for 93 east coast fuel with boostane. They can be run on 93, but for any of the conditions stated above they need more octane. We have a tune to run the 91/93 by itself for the west coast guys.
Switching tunes for different octane has proven to be a bad idea, as good as you all say you will be about it, it never works out that way.
__________________
2016 GT4-R
Rick DeMan
DeMan Motorsport
Upper Nyack, NY
845 727 3070
Porsche Sales & Service
Porsche Race services and parts www.DeManMotorsport.com
This 718 Spyder is running on 93 east coast fuel!!
Please don't confuse the results/comments/info from 981 cars to the 718. They are completely different in the care, feeding and performance personalities.
ALL 718 cars are tuned on 93 east coast octane. West coast cars are tuned for 91
The 981 cars are tuned for 93 east coast fuel with boostane. They can be run on 93, but for any of the conditions stated above they need more octane. We have a tune to run the 91/93 by itself for the west coast guys.
Switching tunes for different octane has proven to be a bad idea, as good as you all say you will be about it, it never works out that way.
Thanks Rick, with so many posts here and in the owners thread it is much better for me (us) to ask you for these requirements instead of accepting or deciphering second hand information.
Here in Western Canada, Chevron carries 94 octane (all I run even now) so for me the 718 Spyder 93 octane numbers are impressive and sustainable.
This 718 Spyder is running on 93 east coast fuel!!
Please don't confuse the results/comments/info from 981 cars to the 718. They are completely different in the care, feeding and performance personalities.
ALL 718 cars are tuned on 93 east coast octane. West coast cars are tuned for 91
The 981 cars are tuned for 93 east coast fuel with boostane. They can be run on 93, but for any of the conditions stated above they need more octane. We have a tune to run the 91/93 by itself for the west coast guys.
Switching tunes for different octane has proven to be a bad idea, as good as you all say you will be about it, it never works out that way.
Whats the difference between the 718 and 981 engines that necessitates the use of octane booster on the 981 engines?
Whats the difference between the 718 and 981 engines that necessitates the use of octane booster on the 981 engines?
I'm guessing it may not be so much about the engine but the ECU. 981 has the old Siemens SDI and the Bosch MG1 in the 982 in my testing has been a lot more adaptive on its own.
01-29-2022, 04:58 PM
with so many posts here and in the owners thread it is much better for me (us) to ask you for these requirements instead of accepting or deciphering second hand information. 
