Light Weight Battery for .2 GT3??? - Rennlist - Porsche Discussion Forums

991 GT3 GT3RS and 911R
Sponsored by:

Light Weight Battery for .2 GT3???

Reply

Old 04-11-2018, 09:49 AM
  #1  
texascarlover
Addict
Rennlist Member
Thread Starter
 
Join Date: Apr 2017
Location: Texas
Posts: 401
Default Light Weight Battery for .2 GT3???

Has anyone done this <10lbs battery conversion?

https://rennlist.com/forums/gt2-and-...r-the-gt3.html

Love to hear more.... reliable?.... issues?..... etc...
texascarlover is offline  
Reply With Quote
Old 04-11-2018, 09:58 AM
  #2  
911therapy
Addict
Rennlist Member
 
Join Date: Sep 2015
Location: Little Rock, Arkansas
Posts: 90
Default

I did it on my 991.1 GT3. Went with the Voltphreaks VP6. Weighs right around 6-7 lbs. Works beautifully. I drive the car at least every two weeks so I do not even leave it on a trickle charger. Plus, it has the cutoff point, so it always has one start in it. Very impressed.
911therapy is offline  
Reply With Quote
Old 04-11-2018, 10:06 AM
  #3  
texascarlover
Addict
Rennlist Member
Thread Starter
 
Join Date: Apr 2017
Location: Texas
Posts: 401
Default

Originally Posted by 911therapy View Post
I did it on my 991.1 GT3. Went with the Voltphreaks VP6. Weighs right around 6-7 lbs. Works beautifully. I drive the car at least every two weeks so I do not even leave it on a trickle charger. Plus, it has the cutoff point, so it always has one start in it. Very impressed.

Thank you - good to hear - 40 lbs weight savings is pretty substantial. Voltphreaks websites says the following

Almost all car alternators maintain 14V to 14.6V to properly charge the car's battery, and this is what the Voltphreaks battery expects. Some Porsche GT's undercharge their lead-acid batteries, and this is not compatible with the more efficient lithium batteries. Below 13V, a lead-acid battery will be partially charged, but a lithium battery will be barely charged. If you have a Porsche GT2 or GT3 (or if you suspect your car's voltage may be incompatible), measure the voltage with engine on (so alternator is active) first to insure compatibility. Voltage at idle should be around 14-14.6V.

I assume the .1 and .2 are fine bc they charge at 14.6v?? Checking bc my .2 hasn’t arrived yet so don’t know for sure. Thank you.
texascarlover is offline  
Reply With Quote
Old 04-11-2018, 10:14 AM
  #4  
911therapy
Addict
Rennlist Member
 
Join Date: Sep 2015
Location: Little Rock, Arkansas
Posts: 90
Default

My 2015 GT3 alternator charged right in the 14.5 range. It was spot on. I think there was only a few 991 GT3's that had the lower-than-normal alternator charge. No way to know for sure until yours arrives, but I would be fairly certain that a new 991.2 GT3 will at least charge at 14V
911therapy is offline  
Reply With Quote
Old 04-11-2018, 10:33 AM
  #5  
texascarlover
Addict
Rennlist Member
Thread Starter
 
Join Date: Apr 2017
Location: Texas
Posts: 401
Default

Originally Posted by 911therapy View Post
My 2015 GT3 alternator charged right in the 14.5 range. It was spot on. I think there was only a few 991 GT3's that had the lower-than-normal alternator charge. No way to know for sure until yours arrives, but I would be fairly certain that a new 991.2 GT3 will at least charge at 14V
Super. Did you lower the front end to compensate for the 40lbs weight savings?
texascarlover is offline  
Reply With Quote
Old 04-11-2018, 10:59 AM
  #6  
qbix
User
 
qbix's Avatar
 
Join Date: Mar 2014
Posts: 634
Default

Originally Posted by texascarlover View Post
Super. Did you lower the front end to compensate for the 40lbs weight savings?
I compensate before and after dinner.
qbix is offline  
Reply With Quote
Old 04-11-2018, 11:43 AM
  #7  
FourT6and2
User
 
FourT6and2's Avatar
 
Join Date: Jan 2018
Location: San Francisco
Posts: 462
Default

Is it really a good idea to remove weight from the front of a GT3 since most of the weight is in the rear?
FourT6and2 is offline  
Reply With Quote
Old 04-11-2018, 12:25 PM
  #8  
BCMgunner
User
 
Join Date: Jan 2015
Location: San Antonio
Posts: 159
Default

I may do this to counter all the wine in the frunk returning from Fredericksburg/Hill Country.
BCMgunner is offline  
Reply With Quote
Old 04-11-2018, 12:32 PM
  #9  
texascarlover
Addict
Rennlist Member
Thread Starter
 
Join Date: Apr 2017
Location: Texas
Posts: 401
Default

Originally Posted by FourT6and2 View Post
Is it really a good idea to remove weight from the front of a GT3 since most of the weight is in the rear?
Depends if you have the larger fuel tank or not I suppose. In general removing 40lbs is a good thing. Thats half a sack of concrete the car is no longer lugging around. If you do the exhaust 15-20lbs comes off the back too (depending on the exhaust) but combined 55-60 lbs is super.
texascarlover is offline  
Reply With Quote
Old 04-11-2018, 01:19 PM
  #10  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,351
Default

This would be a great mod in conjunction with an exhaust. Anyone know how exactly much the OEM 991 gt3 battery weighs?

Last edited by drdonger; 04-11-2018 at 01:45 PM.
drdonger is offline  
Reply With Quote
Old 04-11-2018, 01:39 PM
  #11  
LoloM
User
 
LoloM's Avatar
 
Join Date: Apr 2016
Posts: 14
Default

Do you guys know why there is no OEM option for the lithium battery in the .2 GT3 / RS and GT2 RS ?
LoloM is offline  
Reply With Quote
Old 04-11-2018, 01:43 PM
  #12  
usctrojanGT3
Addict
Rennlist Member
 
usctrojanGT3's Avatar
 
Join Date: Feb 2013
Posts: 8,495
Default

Originally Posted by FourT6and2 View Post
Is it really a good idea to remove weight from the front of a GT3 since most of the weight is in the rear?
Originally Posted by drdonger View Post
This would be a great mod in conjunction with exhaust.
Yup, remove those side muffler paperweights at the same time and now you've dropped 80lbs off the car.
usctrojanGT3 is offline  
Reply With Quote
Old 04-11-2018, 02:11 PM
  #13  
Jimmy-D
Super User
 
Jimmy-D's Avatar
 
Join Date: Mar 2014
Location: Midwest
Posts: 8,126
Default

I did a write up on this about 2 years ago, on this forum, after a long exhaustive search for the all-around best if you want to try to find it.

The Braille is the best and plug and play. The Voltphreaks you needed to build a bracket to properly hold it in place unless they have developed one. The Braille also is better for those in colder weather areas like the Midwest and NE. I think the Braille was only like 3 lbs heavier than the Voltpheaks which is negligible
Jimmy-D is online now  
Reply With Quote
Old 04-11-2018, 02:13 PM
  #14  
Jimmy-D
Super User
 
Jimmy-D's Avatar
 
Join Date: Mar 2014
Location: Midwest
Posts: 8,126
Default

Originally Posted by drdonger View Post
This would be a great mod in conjunction with an exhaust. Anyone know how exactly much the OEM 991 gt3 battery weighs?
I think 35-40lbs. I recall my Braille was a 25 lbs savings which is significant if you ever picked up a 25 lbs weight at the gym
Jimmy-D is online now  
Reply With Quote
Old 04-11-2018, 02:54 PM
  #15  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,351
Default

Originally Posted by Jimmy-D View Post
I think 35-40lbs. I recall my Braille was a 25 lbs savings which is significant if you ever picked up a 25 lbs weight at the gym
Voltphreaks developed a bracket that is 2.4 lbs. With the bracket you are looking at 8 lbs total. Thats a 35-40lb weight saving over stock.
drdonger is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: