DIY: Voltphreaks Lithium Battery installation into M3 E92

italyix a écrit

Donc je viens d'acheter le VPH-900 aussi, Tony à voltphreaks était assez gentil pour inclure les connecteurs SAE et jr. Appel d'offres gratuit. La batterie devrait être là dans quelques semaines, puis elle sera installée avec les autres goodies que j'ai prévus pour cet été.

Stock batterie 60lb, VPH 900 >10lb. Ceci avec le toit de la CF que j'ai prévu devrait raser une bonne 100lb hors de la voiture (avoir un toit ouvrant malheureusement).

Tony et en fait Braille ont également dit que la voiture pouvait rester assise jusqu'à deux semaines et n'avoir aucun problème. Ce qui m'a vendu sur l'unité voltphreaks était la coupure automatique qu'il a intégrée et la possibilité de couper la batterie, je prévois de ne pas conduire la voiture pendant un certain temps. Pas besoin de déconnecter le terminal négatif.

Si je peux me permettre, qu'est-ce qui vous fait basculer vers le VPH900 par rapport au VPR-S40 ? Merci.

e92zero wrote  

italyix wrote

So I just bought the VPH-900 as well, Tony at voltphreaks was nice enough to include the SAE connectors and jr. tender in for free. Battery should be here in a few weeks, then it will get installed along with the other goodies I have planned for this summer.

Stock battery 60lb, VPH 900 >10lb. This along with the CF roof I have planned should shave a good 100lb off the car (have moonroof unfortunately).

Tony and actually Braille as well said the car can sit for up to two weeks and have no problems. What sold me on the voltphreaks unit was the automatic shutoff it has built in and the ability to turn the battery off I plan not to drive the car for a while. No need to disconnect the negative terminal.

If I may ask, what swing you to the VPH900 over the VPR-S40? Thanks.

e92zero wrote

^thanks for the reply. Please keep us updated on how the battery perform. I might eventually go this route when it's time to replace my battery. Still on the oem battery at 77k miles, 4 yrs running. I am assuming installation doesn't require resetting of the battery registry?

kitw wrote

Just curious - anyone looked into the new Ballistic performance batteries?

https://www.pegasusautoracing.com/group.asp?GroupID=BALLISTICAR

Seems a lot more reasonable for even more weight savings.

brownb_2 wrote

20kg is a lot of weight saving, but you lose so much battery capacity.
you went from 85AH to 33AH
thats a huge difference

yes okay if you just have a track car then good work. but hopeless for a daily driver. i would be scared to leave the radio on for half an hour while cleaning your car or something

THE TECH wrote

Not worth the hassle unless it's a track only car. Otherwise, your car will dead without a trickle charger. If weight was a real concern, you wouldn't have purchased an E93.

italyix wrote

I daily mine and have had zero issues thus far. And yes, shedding 53lbs is ALOT of weight.

brownb_2 wrote

true it is a lot of weight.

but for like 4 times the price is it worth it?

you could save as much weight by not filling your tank all the way up haha

italyix wrote

I did it in conjunction with the CF roof, Volks wheels, BBK and coilovers among the other things weighing less than OEM.

I would say for a DD don't bother, the wight savings are not worth it. For a dual purpose weekend warrior, yes.

I also just bought the Akra Evo (used) and this should net me an additional 50 lbs off the car, putting me below 3500 lbs total without driver. When I got the car corner balanced the weight was 3540 with a 1/4 tank of gas. The weight off can be felt, its like driving the car on an empty tank.

The last weight mod I need to do it seats, then I am done. Further weight savings can be had by stripping the car, but I like the interior too much plus I use the rear seats.

Obioban wrote  

Awesome.

I'm doing cf roof next week, and my next weight project will be a LiOn battery. Should push me under 3150 lbs with full interior still .

Still deciding on brand-- so many choices these days!

335_MI6 wrote

Sorry to bump this thread up but question for the people that installed it. Did you guys have to reregister the battery a different way then normal?

rantarM3 wrote

There's a thread where a poster affirmed that he registered the battery with a different rating than the stock battery (90 ah agm - stock v. 40 ah agm - voltp battery, I believe).