spg993tt

sorry if this has been dealt with elsewher,e i couldnt find it readily...
is there a simple list someone has of the main differences between the 2014 vs 2015 vs 2016 991.1 cups?
many of the 2014/2015s ive seen have shifttec paddles.
i see many upgraded, was it only to megaline base on the gt3 cup requirements....??
are they generally considered about the same?
what were the upgrades that PMNA required imsa spec cars to go through?

thoughts on year vs the other years? any good advice is appreciated.
what are the approximate hours one can expect to get out of the motor? out of the trans? what are the approximate rebuild costs for those motors and transmissions?
other new surprising maintenance costs that one wouldnt normally incur on lets say 997 cups?

Viperbob1

You asked for about 10 pages of responses in one post... Will add a couple when I get time in am.

Viperbob1

Some issues with 2014:
Alternator and Bracket. $6K mod. Not enough power.
Front struts. Too small diameter. BENDS EASY. $2300 each
Differential - Issues Breaking
Some people have had issues with with the Shifter and others been fine. If it aint broke...

93 FireHawk 968

Thanks for the insights Bob.

tkerrmd

Well I don’t have the list so I went with a 2016

Tranny rebuild can go 20-30k
Motor 30-50k

BUT rebuild for IMSA has to be PMNA to be sealed other shops ie Autometrics can do as good a job for much less if you are club racing

Probably can get close to 100 hours out of Car if club racing

For IMSA I think tranny and gear box are recommended to do earlier

Also longer you wait for rebuild the most it will cost ie needing a crank or not

Good luck!!

Viperbob1

Remember the engines through '16 are just 997 Gen2s effectively. They do not have the longevity of a 996 motor and depends who is driving. For most 100-150 hours anymore is not uncommon (although most go 100ish). Need to just watch motor health numbers.

On tranny, Porsche calls for 50-60 hours. This is mostly due to the diff. In general there will be very little wrong with a box having 100 hours.

Remember Motorsports maintenance is based upon no failures and limited info. When not driven at 10-10s by other that PRO drivers squeezing 110% out of it, you can in many cases get 2x+ the Porsche recommended time intervals. There are 996 motors out there with 200 plus hours as strong today as they were years ago.

Nizer

As I recall:

2015 over 2014
Shiftec to Megaline shifter change
ECU reflash
Fuel tank pick-up
Larger alternator
Ring & Pinion change
Stronger front dampers - early cars were bending rods on curbing

Don't recall any significant changes for 2016 over 2015.

Edit: didn't see Bob's list when I posted.

Viperbob1

U got a couple I forgot. In addition, there are a number of bulletins that you should adhere to and make changes as described. In some cases, Porsche even still pays for the new part (ie Brake Bar).

FLA997

991.1 2014 onward bulletins (subject only - not links):



PA10_0148_03_2014_Tech_Info_GT3_Cup_Code-Pin_en

PA10_0151_02_2014_Tech_Info_GT3_Cup_Mounting_pre-silencers_en

PA10_0152_01_2014_Tech_Info_GT3_Cup_fixation_trailing_arm_brackets_en

PA10_0159_01_2014_Tech_Info_GT3_Cup_Wishbone_en

PA10_0167_08_2014_Tech_Info_GT3_Cup_Front-axle-damper_en

PA10_0169_10_2014_Tech_Info_GT3_Cup_Engine-thermostat_en

PA10_0171_01_2015_Tech_Info_GT3_Cup_Wheel-Bearing_en

PA10_0172_02_2015_Tech_Info_GT3_Cup_Special-Parts_v2_en

PA10_0173_03_2015_Tech_Info_GT3_Cup_Alternator-clutch-pulley_en

PA10_0174_04_2015_Tech_Info_GT3_Cup_Rear-Window-Fixation_en

PA10_0178_05_2015_Tech_Info_GT3_Cup_Thermostat_en

PA10_0179_06_2015_Tech_Info_GT3_Cup_IPS_en

PA10_0180_07_2015_Tech_Info_GT3_Cup_Cosworth-Toolset-Firmware_en

PA10_0181_08_2015_Tech_Info_GT3_Cup_Drive-Shaft_Boots_en

PA10_0183_09_2015_Tech_Info_GT3_Cup_Joint-Flange_en

PA10_0185_10_2015_Tech_Info_GT3_Cup_Fire-extinguisher-lines_en

PA10_0187_11_2015_Tech_Info_GT3_Cup_Filter-Cable_de

PA10_0188_12_2015_Tech_Info_GT3_Cup_Runtime-Steering-Rack_en

PA10_0205_01_2016_Tech_Info_GT3_Cup_Installation_additional_retaining_br acket_for_fire_extinguisher_en

PA10_0238_03_2016_Tech_Info_GT3_Cup_Alternator_en

PA10_0239_04_2016_Tech_Info_GT3_Cup_Reinforcement_plate_heat_exchanger_e n

PA10_0240_05_2016_Tech_Info_GT3_Cup_Brake_Master_Cylinder_en

PA10_0241_06_2016_Tech_Info_GT3-Cup_Master_Cylinder_Pushrod_Guide_Pin_en

PA10_0245_08_2016_Tech_Info_GT3-Cup_Fly_Wheel_V2_en

PA10_0247_09_2016_Tech_Info_GT3-Tub-991-I-and-II_en

PA10_0247_911_GT3_Cup_Modification_Instruction_Body-Shell_991-I-and-II_en

PA10_0248_10_2016_Tech_Info_GT3-Cup_Marshall_Switch_Turn_Lock_en

PA10_0249_07_2016_Tech_Info_GT3-Cup_Alternator_en

PA10_0269_12_2016_Tech_Info_GT3_Cup_Roll_Cage_Padding_en

PA10_0270_13_2016_Tech_Info_GT3_Cup_Roll_Cage_Padding_en

PA10_0271_01_2017_Tech_Info_GT3_Cup_Master_Cylinder_Pushrod_en

93 FireHawk 968

At the risk of sounding quite naive, does Porsche provide the parts noted in the bulletins?

Viperbob1

Most of the time NO they all cost. Usually things like "when you pull transmission, replace flywheel with GT America one". And they are stupid cheap (bs)... There are some things they replace like balance bar, electronic noise filter, and some other stuff that they are good about replacing. There is sort of a recall on a certain number of Cosworth Dash and IPS units right now. Bad embedded SD cards. They have to replace and this is free. All in all to stay current though, it is a fair amount of $$$$.

pold9000

hi
where you can download the tech infos/mods? if you own a car is porsche forced to give you the infos? i heard a team have to renew their permission to download relevant data every month?

are the obove subjects all ever posted tech mods for the 991?

bye
wolfgang

@viperbob - thanks for the info for purging the compressor of the shiftec unit - mine had same water inside, how is this handled on the megaline units?

Viperbob1

Wolgang - same way, Have to remove the compressor(easy 2 nuts, the main line and an electrical connection) and then you shake it around let it sit upside down and shake some more. Here in humid florida it fills up quick.

FLA997

You can register for PMRSI, the form is attached below (for North America). You will then get access to all the service/technical bulletins for a car you own.

I seem to get an email from Porsche every year requesting I confirm that I still own "X" car to maintain PMRSI access.

Porsche and "forced to give"...that's funny.

Red Bear

Maybe I missed it but did not see parts listed for the rear wing support kit...maybe not posted yet? 17 forward is updated within the chassis. Do the math on all the updates and a new car every season is the way to go!!!