Turbo / NA

[dkstz]

What are the differences in a race track, between a car turbocharged and a supercharged. Suppose they're the same car, same model, same HP but one is turbo and the other NA. What's the feeling of driving at high speeds?
thnks

 

[GameBoyFX]

umm, usually it depends on the car, but the Turbo(vs NA) one would be faster o_O


(also, do u mean turbo and Super, or turbo and N/A?)

 

[Drifting Thunda]

With roots and screw type superchargers the torque curve is higher down low and the feeling of torque is instantaneous as you press the throttle because the supercharger RPMs are controlled by engine RPMs, so it's basically always trying to pull air in whether you apply throttle or not provided you are at some engine speed. The effect of the instant boost with throttle is the "torque on demand" effect that many NA and supercharged cars enjoy. The centrifugal supercharger is more like a turbo in design, but is still controlled by engine RPMs. The torque on demand effect of the centrifugal blower (supercharger) is much less than that of the roots or screw superchargers, but the centrifugal is generally capable of producing more peak boost for race cars. Just a side note, the screw-type blower is superior to the roots type in basically every way.

A turbo car is more variable usually because of the very different effects of different turbo sizes. Even so, it's always going to feel some turbo lag immediately after you press the throttle as the exhaust gasses create pressure to spool up the turbo. It's my understanding that generally a turbo can make more peak horsepower than a blower if it's big enough, but the bigger the turbo, the more lag there is generally, so there is a trade-off. Sometimes twin turbo cars use one small turbo and one big turbo also. The small one is to provide more boost while the big one would still be spooling, this is to negate turbo lag, but the end result still has a con since the smaller turbo only gets in the way, so to speak, once the larger turbo has spooled. This is just what I've come to understand but if I'm wrong about anything just correct me.

A naturally aspirated car has no turbo lag nor does it devote some of it's energy to powering a supercharger. The NA car relies more on the base dynamic compression ratios to make power. Not necessarily a bad thing.

 

[Vee_8]

if i wer racin id have the N/A car for controllability round the twisty bits, but if it wer just for fun turbo delivery mid bend defo puts a smile on ya face hehe!

 

[Famine]

if i wer racin id have the N/A car for controllability round the twisty bits, but if it wer just for fun turbo delivery mid bend defo puts a smile on ya face hehe!

*consults Rosetta Stone*

Vee_8. You are English. Please try your hardest to communicate IN English. We have a large number of non-English speakers who use this site who would quite like to be able to read everything. If a point is worth taking the time to type, it's worth taking the time to type properly so that the most number of people possible can read it.

And you aren't limited to 150 characters at GTP, unlike a mobile phone.

 

[Vee_8]

Sorry! bad habit

 

[Famine]

That's fine. You won't be burned at the stake for it (well, not by me - I'm not a member of the moderation team).


You WILL on the other hand be burned at the stake for being Lancastrian. Die, heretic! Die!

 

[Vee_8]

That's fine. You won't be burned at the stake for it (well, not by me - I'm not a member of the moderation team).


You WILL on the other hand be burned at the stake for being Lancastrian. Die, heretic! Die!

Guilty as charged! But ya have to admit, Red roses are sooo much nicer than White!

 

[TheCracker]

A similarly powerful N/A car would probably be more flexible than a turbo on a race circuit, the turbo car would have a narrower 'power band'. This would be the case if the cars in question were both road spec cars - if they were both highly tuned race cars the difference would be less. A heavily tuned race engine would probably have race cams, this would give you a sudden peak in power high-up in the rev range, with very little below - not unsimilar to a turbo engine.

Count me in on the white-rose side of this latest War of the Roses - especially when the the opposition is from Ossie!

 

[skip0110]

A naturally aspirated car has no turbo lag nor does it devote some of it's energy to powering a supercharger. The NA car relies more on the base dynamic compression ratios to make power. Not necessarily a bad thing.

I understand the computation of static compression ratio--what is a dynamic compression ratio and how is it different? Thanks in advance.

 

[Drifting Thunda]

I understand the computation of static compression ratio--what is a dynamic compression ratio and how is it different? Thanks in advance.

Here's a little info... http://www.hotrod.com/tipstricks/34219/index5.html