Will a system bring down my HP and MPG??

[2loudisjustright]

wont reduce hp other than the alternator(s) may lug your engine more. MPG yes that will suffer.

how much worse on the MPG we talking? i mean i thought 9-10 was bad enough, if i put it in will it drop below 7-8?

if you are getting 10mpg then you probably have a huge ass diesel engine or something, so i doubt you will see any difference at all in hp or mpg. For instance my truck that gets 13mpg empty get 11-12 even when pulling 10,000lbs of scrap iron.

Lol no diesel, just a 5.7 350 chevy smallblock. But the mileage is so bad because its old, pulls a 5500lb car, and everyone seems to want to race my ass like they have an F1.......

A 5500 pound car? What ya got in that thing? A 1500 pound lead bar? lol

I had a similar weight system in my 65 impala back when i had the 327 in it. I never really even noticed a difference at all in hp or mpg. I wasnt running much wattage back then, so i dont know how the pull on the alternator will affect it tho.

[LT.Smoke]

It should not affect your horsepower but your MPG will suffer if you add alot of weight

[Dwn4BassAlan]

It should not affect your horsepower but your MPG will suffer if you add alot of weight

yea thats I figured, I was only going to add about 100lb and at this point its not a huge difference so I thing I might be able to pull some other unnecessary things out to try to lighten up

[Dwn4BassAlan]

haha my paint alone is almost 30lbs. theres 18 coats and the rally stripes

[OrionStang]

Here's an example for you using my car and a friend with same car, engine, rear gear, everything. I did some mods and ended up gaining ~40rwhp. I had a 300lb system, and when we raced (at the track), we had almost identical 1/4mile times. So, adding 300lbs was like losing 40 hp. You don't actually "lose" power, but the added weight will make it slower.

[2loudisjustright]

haha my paint alone is almost 30lbs. theres 18 coats and the rally stripes

Reallly???

Pull your car on some scales. I think you will be surprized.

[BassJunkie]

With 50-100lbs extra it would be just like having a small hooker in your trunk.

this may not be the same for u (as i drive a 2000 cavlier with a 2.2) but i only lose city mpg...overall responsiveness is the same (maybe a little better) as stock....but i have a 280 amp alt, a D3400 under the hood, 1/0 everywhere, a pair of sony's in the trunk (ran out of cash, will be upgrading sometime lol) and a DC2k in my car, my highway mpg is still just as good as stock, cant be too noticable when ur car has about 3 times the power mine does

What kinda gas mileage are you getting? With around 5-600lbs of equipment and a 270xp i'm still able to pull 27mpg highway.

[01ExSport]

I've heard for every 3 amps, it's roughly a 1 HP loss. May be some mumbo jumbo, though.

[matt14]

Its a 71 chevelle, dont worry about gas mileage.Ive had people ask me what kind of mileage i get out of my 2006 yukon, and i tell them that its a SUV and diddnt buy it for gas mileage, but to be able to take my family anywhere in it comfortably ( and I averaged 16 .6mpg before rims...13.3 after. but i dont give a shit, i like the way it looks) . With a old school, its kinda the same thing. Yea it would be nice to get some dent mileage out of it, but when its all said and done, its a 40year old car tank with a V8. If it were me, id do it the way i want it. Throw some beat in there, and do some other things to make it quick, and make it the way you want it with no worry of mileage and such.

[baaudio]

High amperage alternators will suck up hp because they take more effort to spin. The weight and extra strain on alt with cost you mpg. Prolly not too much honestly. I have close to 300 lbs added to my explorer with same mpg