And there it is. Supercharged V8s more efficient than the Prius. Learn something every day.

That the fast and furious edition?

 

10PSI on the T70 on a stock 5.0?

 

oh look. more turbo goodness. want every little detail about this so you can google it and try to find a typo?

 

Chevy also spends a ton of money perfecting a classic engine. The added power allows for taller gears the give better gas mile on the highway but thats ONLY on the highway.

 

i have a video of it somewhere

it made 225whp and 240wtq

 

exactly...

the engine is more efficient at low rpms... allowing it to cruise at a lower rpm... go up hills at a lower rpm... accelerate at a lower rpm... saving gas...

and to answer dumbass's question... the s/c will make the engine more efficient... less throttle to accelerate... less throttle to climb hills... no shifting down... etc...

 

Omg what have I done lolthe car I sold to buy the jeep was a 01 poetic gtp with a gen 5 supercharger 3.0 pulley intercooleda gtp with the same modding as I had but a turbo runs more efficiently. Turbo has no parasitic loss

 

Actually with extra high gearing the V8s have little acceleration in the lower gears. If you try to accelerate up a hill, youll end up use more gas fighting the high gear than if you shifted to a lower gear. And as soon as your on the gas it starts eating fuel.

AND BTW fuel used is proportional to the air goin in. Forced induction makes of for a lack of displacement by cramping more air in that a larger motor would would suck in on its own but the fuel requirements are the same. Think A/F ratio.

 

$5,000 was the cheapest turbo and supercharger kit i found on the net for a xj

 

http://www.4wheeloffroad.com/techart...kit/index.html

 

Being that the XJ has such a low compression ratio from the factory its actually a really good canidate for boost. Compression wise its safe into the teens, not sure if the internals can take that much though.

The effect a turbo has on a engine goes into the volumetric efficiency of the engine. As was commented before about the Corvette getting great MPG, its compression is like 11:1 makin if quite efficient. An engine like that cant take more than maybe 5 psi and that might even be pushing it. But take and engine like the XJ thats under 9:1 and you can added nearly 20 psi before its too much for the fuel.

Most people adding a turbo want power and will therefore decrease the compression and efficiency so the can throw more boost at the engine and make tons of power that couldnt be made without it.

 

thanks genius... compressed air burns cleaner and more fully than uncompressed air (over normal air pressure ~14.7 at sea level)

i have a new truck... i know all about it... even if you shift down to go up a hill its still a lower rpm compared to what a smaller engine would have to do.

like 2k instead of 3-4k...

 

pretty much all true...

depending on what year corvette they have different compression ratios...

ls1: 10.25:1
ls6: 10.5:1
ls2: 10.9:1

a lot of people run more than 5psi on these engines so its not really true. although what you said is correct that you can basically make more power with boost pressure than you can with compression. so with a lower compression you can run more boost, and achieve a greater efficiency and make more power than you would with higher compression and lower boost.

a lot of it depends on what pistons are in the motor, if they are cast aluminum or HE pistons, high comp and high boost is destroy them pretty fast esp if you aren't really careful. i've seen people run 11:1 with 10-15psi on premium fuel with forged aluminum pistons without any problems... a lot of it depends on timing too...

 

WHAT!?! First of AIR DOESNT BURN! Oxygen allows a fuel o burn though.

If you have a truck you should know it has pretty low gearing for towing and what not thats why it cant go 200 mph, like a Vette! Gears sole purpose is to reduce the force needed to move something. This is why any vehickle has them, the lower gears are easier to move in. Obviously you think you know more than you do. I only studied engine and gearing systems in college, but I dont hae a clue as to what Im talking about.

Low RPM will use less gas but if your too too low for your gearing theyre will be to much resistance to efficiently use the gas you are buring.

 

you guys are ridiculous. I didnt waste my life reading this whole thread, because it started to get dumb on the first page, and is even worse on the last one, so it couldnt have been too good in the middle.

As far as the OPs question turbo and sc kits can be found for the 4.0 online.

as far as the ranting, boost can most def get better mileage, but its all in the tuning. try googling turbo prius. the problem isnt the boost, its the fact that once you have the power, you dont want to drive it the same way as before. if it takes 100 hp to overcome the restrictions to dirve on the interstate, then once u turbo a car, you can make that 100 hp much easier, at a lower rpm, using less fuel. that and most all cars are rich to begin with, so tuning and little boost makes up for that.