Official SN Power Adder Poll

[philmiup]

I vote for Rice power STICKERS!!!!!!!!!!

 

[BlackFox5.0]

I have a centrifical, but wish I had a Turbo (single) or Kenne Bell.

 

[malik641]

your statment "turbo.....doesnt rob the engine of any power" is incorrect. Of course a turbo takes energy from the engine to turn it. A supercharger takes it directly from the crankshaft via the belt-drive. The turbo acts as a significant restriction in the exhaust stream -- each time the pistons come up on the exhaust stroke they have to push harder than they normally would to overcome that restriction. As with the supercharger - the loss is worth it as you can net a power gain. But the turbo creates parasitic loss as well. Just to set the record straight.

About the exhaust: In theory, a turbocharger is more efficient because it is using the "wasted" energy in the exhaust stream for its power source. On the other hand, a turbocharger causes some amount of back pressure in the exhaust system and tends to provide less boost until the engine is running at higher RPMs.

About parasitic loss: Superchargers have parasitic loss just like turbos do....Turbochargers live off exhuast; Superchargers live off the belt.

And the part about the pistons pushing harder than they normally would to get through the restriction: NOT after certain rpms....plus there are ways to rid lag.

 

[Michael Yount]

I see several pieces differently malik - turbos' peak boost/rpm relationships and resulting engine torque/power curves are a function of how the exhaust and compressor turbines are sized - along with the other engine components of course - heads/cams. Most oem turbo systems (Mercedes new V-12 and VW/Audi 1.8 motors off the top of my head) produce prodigious boost at VERY low rpm - those engines all have peak torque figures at 1800-1900 rpm. Sized to do so, turbos can produce significant boost at very low rpm - similar to positive displacement superchargers in that regard.

With regard to system backpressures - they typically increase with increasing rpm and increasing exhaust flow.

 

[5spd GT]

If I had the money...it would be a Dart block (with all the goodies) with a nice Turbo setup...

 

[malik641]

With regard to system backpressures - they typically increase with increasing rpm and increasing exhaust flow.

That doesn't necessarily mean that the power loss increases during higher pressure due to the higher revs, right? Or does one exceed the other?

 

[PACETTR]

85SS - there is no Santa Claus - your statement "turbo.....doesnt rob the engine of any power" is incorrect. Of course a turbo takes energy from the engine to turn it. A supercharger takes it directly from the crankshaft via the belt-drive. The turbo acts as a significant restriction in the exhaust stream -- each time the pistons come up on the exhaust stroke they have to push harder than they normally would to overcome that restriction. That's where the parasitic loss occurs. As with the supercharger - the loss is worth it as you can net a power gain. But the turbo creates parasitic loss as well. Just to set the record straight.

While a turbo does act as a restriction in the exhaust stream, it still has a much greater efficiency than a s/c. The exhaust gases are "spent" energy. A turbocharger takes advantage of this "waste" and turns it into power. Conversely, a supercharger relies on the engine's horsepower via a belt, much the same way as a smog/power steering pump, A/C compressor, etc. Of course there is a "net power gain" or no one would use them, but there is a reason sanctioning bodies put much greater restrictions on turbo cars.
Check out nmraracing.com...

13: WEIGHT BREAKS/ENGINE COMBINATIONS
PRO 5.0
Base Weights:

ENGINE POWER ADDER MAX CI BASE WEIGHT
4.6L & 5.4L/302/351 Nitrous Oxide 480 2200
4.6L & 5.4L/302/351 Supercharged 480 2650
4.6L & 5.4L/302/351 Turbocharged (94.0 mm) 480 2600
4.6L & 5.4L/302/351 Turbocharged (96.5 mm) 480 2800
4.6L & 5.4L/302/351 Turbocharged (98.0 mm) 480 2950

Just to set the record straight..

 

[Michael Yount]

Don't think we ever said one wasn't more efficient than another (and there are almost LIMITLESS ways to define efficiency in this context); just that you don't get something for nothing - not even with a turbo.

 

[PACETTR]

Some good info from Hot Rod...

"Supercharger" is a generic term for any forced-induction compressor that is driven by a belt, gears, or a turbine. The turbine-driven version is known as a turbocharger, and it has the potential to be the most efficient power-adder for an internal-combustion engine on the planet. An internal-combustion engine is notoriously inefficient: Only about one-third of the energy released during combustion actually drives the crank. Of the remaining two-thirds, one-third goes into the cooling system, and one-third goes out the exhaust as heat. In fact, a 200hp engine dumps the equivalent of about 70 hp of raw heat straight out the tailpipe! However, a turbo's turbine-wheel is driven by the engine's own exhaust gases as they exit the motor, so some of the heat that normally goes to waste is now used to power a compressor that pumps more air into the engine.

Although a turbo's position in the exhaust stream does restrict exhaust flow potential to some extent, the pumping losses are much less than the parasitic drag induced by a conventional supercharger's belt or gears. In a typical gasoline-fueled engine, it's common to see 30 out of every 100 hp added by a beltdriven supercharger being wasted turning the drive pulleys and belts; this compares to about 5-10 hp per every 100 suffered as pumping losses by a typical well-designed turbo installation. Considered as a system, the turbo setup has less heat buildup than an old-style Roots blower, and its smaller size compared to a centrifugal supercharger permits higher compressor-wheel rotational speeds and more radical blade-tip curvature that collectively translate into greater pumping efficiency.

 

[Look Its Aaron]

I would prefer a turbocharged 331.

 

[Musclecarfan88]

I plan on running nitrous just because its cheap and easy. but i love blowers stickin out of the hood!

 

[willys1]

SC sound the meanest,and the boost is rite there all the time Nitrous is the cheapest big HP you can buy!! But there's something about a big turbo that gives you a woody every time you drive it Remember those 1987 GN's? With just the addition of a bigger turbo unit those things are in the 11's all day

 

[Kevins89notch5.0]

I would prefer a turbo, but my bank account and knowledge pushed me towards a vortech.

 

[FiveLtrRiceEatr]

i prefer the centrifical supercharger, yes turbos are more effienct. But cost way to much and I was leaning towards a turbo, i talked to pro 5.0 racers and other classes of racers and they turned me towards cent. superchargers because they are cheaper and they have been designed and redesigned for mustangs

 

[nito88stang]

Roots for the TQ

Centi for the price

 

[Dark Knight]

come on...

I'm going with 557 cubes, torque and HP all the time, then a 200 shot fogger for MORE power..

 

[bluevenom867]

come on...

I'm going with 557 cubes, torque and HP all the time, then a 200 shot fogger for MORE power..

Totaly agree..

 

[PoonRacing]

Sold my Vortech T-trim over this summer, going to T-72 setup, and say good bye to the belt poping-off problems.

 

[RydeOn]

Turbo all the way. My Cobra told me not to cut any holes in her tho, so I had to buy a blower.

 

[donsbad68]

gotta go with cubic inches in a bottle.