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And yes, the mini boosters you can keep in the car DO work, but have one die on you once..
On reserve this starts faster than the lead acid I replaced, weighs like 12lbs too. In normal mode (not from standby) the motor spins 30% faster than it previously did..im very happy.
Next time they have a sale...hit it. Like i said, likely the last battery this chassis will ever need.
We're direct with them too, install them from time to time in custom builds. I'm putting one in my Cobra, only 8lbs, pretty sweet.
The problem with my 928 race car is removing weight off the rearmost part of the car is counterproductive.
We're direct with them too, install them from time to time in custom builds. I'm putting one in my Cobra, only 8lbs, pretty sweet.
The problem with my 928 race car is removing weight off the rearmost part of the car is counterproductive.
.....Weight is weight, regardless of where it comes from.
If it is gone, you no longer have to accelerate it, stop it, or corner with it.
I'm going to guess that you are not running the spare tire, the tool kit, the air pump, the rear carpet pieces, probably the rear seats, anyway....
In a 928 race car, hopefully the suspension is evolved enough to adjust for weight removed from the rear.
Additionally, in a 928 race car, you are going to need a transmission oil cooler (once one is beyond the rookie stage), which adds weight back into the rear of the car, when done correctly.
.....Weight is weight, regardless of where it comes from.
If it is gone, you no longer have to accelerate it, stop it, or corner with it.
I'm going to guess that you are not running the spare tire, the tool kit, the air pump, the rear carpet pieces, probably the rear seats, anyway.
And in a 928 race car, hopefully the suspension is evolved enough to adjust for weight removed from the rear.
Additionally, in a 928 race car, you are going to need a transmission oil cooler (once one is beyond the rookie stage), which adds weight in the rear.
Weight balance is just as important as overall weight. Go ahead, take 500lbs off the tail of a 928 and nothing from the front and tell me how well it handles. Ever driven a Dodge Challenger? This is why Twin Turbo Todd is drawing up plans to move the engine back a few inches, his car is already close to being under 3,000lbs but the nose is still too heavy even with all the accessories (including the starter) moved to the rear.
I have a set of corner scales, so I probably know a bit more about the weight balance of my car than you do. Yes there's still weight to be removed from all over, the fact remains just removing weight from the rear of a 928 isn't necessarily a benefit.
As for trans cooler, we're well beyond rookie stage.
Here is version 1 and version 2 Jim and Todd put together. Todd and I are now working on version 3 incorporating some ideas he came up with for his car.
The second 928 pictured here is the one where Todd installed a 2.75 R&P into an S4 manual transmission. We're also talking about duplicating that for my car. That's definitely not a modification for rookies.
Weight balance is just as important as overall weight. Go ahead, take 500lbs off the tail of a 928 and nothing from the front and tell me how well it handles. Ever driven a Dodge Challenger? This is why Twin Turbo Todd is drawing up plans to move the engine back a few inches, his car is already close to being under 3,000lbs but the nose is still too heavy even with all the accessories (including the starter) moved to the rear.
I have a set of corner scales, so I probably know a bit more about the weight balance of my car than you do. Yes there's still weight to be removed from all over, the fact remains just removing weight from the rear of a 928 isn't necessarily a benefit.
As for trans cooler, we're well beyond rookie stage.
Here is version 1 and version 2 Jim and Todd put together. Todd and I are now working on version 3 incorporating some ideas he came up with for his car.
The second 928 pictured here is the one where Todd installed a 2.75 R&P into an S4 manual transmission. We're also talking about duplicating that for my car. That's definitely not a modification for rookies.
Well, we're not talking about taking 500lbs off the back of a 928, here.
Are we?
Be logical, if you possibly can....
I'm betting that you aren't running the spare tire, the tool kit, the rear seats, etc.
Heck, you've ever removed the emergency brakes!
I hate to tell you, but 20 more pounds, from a battery change, isn't going to radically upset the current weight balance....
BTW, in terms of weight balance, it would be far more intelligent to run the actual oil cooler in the rear of the car, than running lines to a forward cooler.
Adds weight back to the rear, instead of moving it to the front.
If you need some pictures of how to do this stuff, let me know.
Well, we're not talking about taking 500lbs off the back of a 928, here.
Are we?
Be logical, if you possibly can....
I'm betting that you aren't running the spare tire, the tool kit, the rear seats, etc.
Heck, you've ever removed the emergency brakes!
I hate to tell you, but 20 more pounds, from a battery change, isn't going to radically upset the current weight balance....
I'm simply reading what you typed:
".....Weight is weight, regardless of where it comes from. If it is gone, you no longer have to accelerate it, stop it, or corner with it."
That's false, and you know it.
Yes all of those things are removed from the rear of my car, which is part of the problem since the *** is already too light. Removing another 20lbs from the rearmost spot is far more critical than say removing 20lbs from right behind the center line. Maybe these subtle changes are not critical to you, when you're working with a team that's used to building championship winning cars, they get picky about such things. Anything worth doing is worth doing the best you possibly can. It ain't fast, easy, or cheap. Then again, neither is Motec and that's going on this car too.
Originally Posted by GregBBRD
BTW, in terms of weight balance, it would be far more intelligent to run the actual oil cooler in the rear of the car, than running lines to a forward cooler.
Adds weight back to the rear, instead of moving it to the front.
If you need some pictures of how to do this stuff, let me know.
Thanks for the offer, but the red car already has the coolers in the rear and the black car....hence "version 3"
If I let Todd go wild, he has the plans in his head to move the clutch, starter, and alternator to the rear of my car. We'll see.
I'm simply reading what you typed:
".....Weight is weight, regardless of where it comes from. If it is gone, you no longer have to accelerate it, stop it, or corner with it."
That's false, and you know it.
.
Try real hard. (The logic thing.)
If the weight is gone....it's gone.
It's no longer there to accelerate, stop, or corner.
I seem to get 6-8 years out of ever LA battery I stick in my 928s, for roughly $200 each now that new battery would have to last 18 years to be truly worth it to me.
But that is just my opinion on the ROI for myself. If yours sit that emergency start function would be worth it
I seem to get 6-8 years out of ever LA battery I stick in my 928s, for roughly $200 each now that new battery would have to last 18 years to be truly worth it to me.
But that is just my opinion on the ROI for myself. If yours sit that emergency start function would be worth it
This assumes the costs of each technology remain stable..they are not, and they are in an inverse relationship. Plus lead acid is a GROWING industry as well, just not for cars.
The demand for effective energy mass storage is growing...and low cost lead acid ones 2.1v cell at a time, is growing.
AND the commodity price for lead in 2000 was $450/T, today it is...~$2100/T
Also..lithium/etc materials are finally entering a growth period in recycling technologies and cost effectiveness..which is good for the bottom of the storage density cell market
At todays costs, the lifetime cost per energy unit of lead acid, is higher. It costs 1/3 of the initial purchase price, but on paper will need to be replaced 6 times...and10yrs ago the LiIon battery cost 5x more too.
This math is confusing me; and I think it’s because we don’t have a stated denominator. What is y?
LA Battery: $200 ÷ y = $ annual cost
Lithium Battery: $900 ÷ y = $ annual cost
The Antigravity page has 5 year car warranty, so I assume y = 5(?) In that case, LA = $40 and Lithium = $180. Before someone says a LA battery won’t last 5 years, I can only say I’ve never had a battery in any vehicle (to include lawnmower) last <5 years. And I don’t do anything special – no battery tender, etc. Harshest of German winters and central Texas heat – last 928 battery was 9 years. But maybe I’m an outlier.
07-20-2023, 09:55 PM
Antigravity battery...winner.
