Will a system bring down my HP and MPG??

[Dwn4BassAlan]

So I was wondering if anyone knows if installing a system would bring down my HP/MPG. Someone told me that it brought down the HP in his '65 mustang a considerable amount. It doesnt make sense to me how you could lose HP? But the MPG thing seemed plausible, becuase I know running the A/C is a MPG killer I figured this might do it too? I'm only running about 2000W RMS and maybe about 90-100lbs? its a chevy 350 in a '71 chevelle.

If anyone knows if that a load of crap or not that would really help me out, because I really want to put my system in but not at the expense of a lot of power and mileage.

[MIKE-2U]

Well it will bring down your mpg because your alternator will put more pull on your engine to produce more eletrical. Also the weight of your system will slow your car down. Now as for how much ? really depends on the equipment

[Jessica]

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

Your engine makes the same hp, just less gets to the flywheel cause its turning alts.

Edited April 8, 2012 by strangeduck

[littlebuck1919]

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

[Dwn4BassAlan]

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?

[Delinquincy]

gas mileage for sure as far as hp idk i would say it depends on alot of little things

[Jessica]

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.

[Dwn4BassAlan]

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.......

[Jessica]

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.......

Like i said, it probably makes a bit of hp and torque, torque is what you need to turn alt(s). I doubt you will really even notice. You may at the strip though. every 100lbs = 10hp or something

[EclipseChris]

Don't forget the simple fact that the system is going to weigh a certain amount. In theory (in the racing world) every 7 lbs is equal to 1 hp. Having a system in a car is like having passengers in the car all the time.