I ran a 4.5 at carpet wars all winter and never dumped whilst gunning it all the way. You'll never use as much power in a buggy... I ran my 4.5 in 6-cell at worksop once and had to back the timing down a lot to be able to drive it... Ran it the week after at the Petit RC race and people were asking me what cells I had that's how quick the car was... They never realised I had a 4.5...
If I'm not mistaken the actual rules state that you can run 5 cells but you need to have the 6th in the car, meaning you're not gaining anything weight wise. A cell is roughly 68g and we've found it to make quite a difference in TC and I believe in buggy it would also. So trying it following the actual rules won't mean anything, since you'll not have any of the benefits of running at lower weight.
I'm not saying it's the way forward, I'm saying it won't be as hard on cells as in TC where we dump a pack with our 3.5s and other silly winds...
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