lol 
are turbos bad on gas milage?
On The Tree
Joined: Feb 2002
Posts: 178
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From: Ann Arbor, MI
I can tell you that if its tuned decently and you drive it conservatively gas mileage is about stock.
on the way to the n vs s event, I filled up and jumped straight on the xway, ran till almost empty and filled up, got 27.4 mpg. 3850# car, and 3.73's (6 speed). at stock weight and 3.42's I bet I would see almost 30.
BUT in everyday driving, I can bring that average down to 19-22 mpg, from tank to tank. 40% city driving. so I know that when I lean into it, those 42#ers are pouring in the fuel. city mileage is probably 13-15?
cant wait till the 60's go in......
on the way to the n vs s event, I filled up and jumped straight on the xway, ran till almost empty and filled up, got 27.4 mpg. 3850# car, and 3.73's (6 speed). at stock weight and 3.42's I bet I would see almost 30.
BUT in everyday driving, I can bring that average down to 19-22 mpg, from tank to tank. 40% city driving. so I know that when I lean into it, those 42#ers are pouring in the fuel. city mileage is probably 13-15?
cant wait till the 60's go in......
If you're talking about high power motors, seems like a turbo motor would get better mpg than a na motor with the same hp because it would have better volumetric efficiency. The cam on the na car makes it less efficient especially at lower revs and that's where you'd be checking mpg.
Last edited by Silver02; Aug 13, 2005 at 02:27 PM.
Originally Posted by bradyb
Most of the STS kits at 5 PSI get 10-20% better gas mileage just because it makes your motor more effecient.
Pure BS....the crap is deep in here
BTW, turbos don't give you better gas mileage
on a petro motor.....lol LS1 Tech Stories
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Originally Posted by JZ 97 SS 1500
BTW, now don't confuse this with a Diesel.
interesting stuff.
huh. I did a 300 mile trip over the weekend. 20% in town driving the rest on teh highway at 80mph. 24mpg.. two WOT's on the on ramp.. the gas mileage might not be "better" but it is pretty damn good.
SSU'S Vice Mod
Joined: Jul 2004
Posts: 2,391
Likes: 0
From: Hazard Co. Maryland
Originally Posted by smokinHawk
been trying to educate my self with desiels and its strange how there different they are to gasoline engines as the more fuel you put in the more power you get, not really related to the more air you put in, though the air controls the black smoke. and the more fuel you put in and when you inject it the hotter the EGT's get, whereby the air cools the egts. Almost like the roles of air and fuel are reversed.
interesting stuff.
interesting stuff.
Diesels are throttled by fuel, not air like a gas motor. Add to that that they work off of auto ignition (basically they are designed to detonate) and that's why you can put nitrous, propane, and 50+ #s of boost to them. Obviously the more fuel you put to the diesel the hotter it will burn (up with the optimum ignition temps) that's why turbos are used with them, as it allows the more fuel to be added, since it still is an air pump. Turbos were basically used to control soot emmissions from diesels but boy have they caught on with the peformance aftermarket. As far as turbocharging tech. for diesels they are lightyears ahead of gasoline and other "spark" lit fuels.
EDIT: Most of the injectors run at fuel pressures in excess of 24k psi. Fuel pumps have flow rates that probably compair to Fuel motors (in terms of rail pressues). I don't know if you caught HotRod yest this month, but they have a great article in there about Diesel performance. Also, clean diesel and bio diesel will probably earmark future transportation, and if the performance industry can find ways to make awsome diesel performance cars / trucks, I'm game!
Last edited by sb427f-car; Aug 16, 2005 at 09:28 AM.
Wow, how did this turn into a diesel discussion?
As stated above, a turbo increases the efficiency of the engine. When an engine is operating at or near peak efficiency, you may see an improvement in the mileage noted. OEM's are looking more and more at turbos for this reason. It also allows them to make the same power out of a smaller engine, thus improving fuel economy. Less fuel needed in a smaller motor.
If your turbo/motor (at lower boosts 5-8psi) are set up correctly, you should see similar mileage as you had N/A. Now that will not be the case for those with a race set-up (higher boosts over 8psi). Those setups will require higher flow injectors which common sense will tell you requires more fuel and that will probably bring your MPG down some.
As stated above, a turbo increases the efficiency of the engine. When an engine is operating at or near peak efficiency, you may see an improvement in the mileage noted. OEM's are looking more and more at turbos for this reason. It also allows them to make the same power out of a smaller engine, thus improving fuel economy. Less fuel needed in a smaller motor.
If your turbo/motor (at lower boosts 5-8psi) are set up correctly, you should see similar mileage as you had N/A. Now that will not be the case for those with a race set-up (higher boosts over 8psi). Those setups will require higher flow injectors which common sense will tell you requires more fuel and that will probably bring your MPG down some.
SSU'S Vice Mod
Joined: Jul 2004
Posts: 2,391
Likes: 0
From: Hazard Co. Maryland
Originally Posted by smokinHawk
i think my next car is going to be a VW golf TDI
Honestly smokin...i was seriously thinking about if this T/A deal falls through (finally looking her over on saturday), saving money for another year and trading the malibu on a low miles TDI jetta or golf. 46 MPG is better than ~30 even though diesel is a bit more expensive than regular unleaded.
Originally Posted by sb427f-car
Honestly smokin...i was seriously thinking about if this T/A deal falls through (finally looking her over on saturday), saving money for another year and trading the malibu on a low miles TDI jetta or golf. 46 MPG is better than ~30 even though diesel is a bit more expensive than regular unleaded.