on/off supercharger?

[greasemonkey]

if you're looking for a more efficient way to drive a forced induction car it's called a turbo-charger. foot on the floor=full boost; light foot=zero to very little boost. if you drive with a light foot you get better mileage than the same engine N/A because you're able to keep the engine revs way lower.

friend of mine figured out that his tacoma with the TRD supercharger payed for itself in fuel cost over the same engine N/A in about 50,000 miles. if a turbo is more efficient than a centrifugal supercharger(which they are) then it's even more better.

[DanO]

Originally Posted by greasemonkey

if you're looking for a more efficient way to drive a forced induction car it's called a turbo-charger. foot on the floor=full boost; light foot=zero to very little boost. if you drive with a light foot you get better mileage than the same engine N/A because you're able to keep the engine revs way lower.

friend of mine figured out that his tacoma with the TRD supercharger payed for itself in fuel cost over the same engine N/A in about 50,000 miles. if a turbo is more efficient than a centrifugal supercharger(which they are) then it's even more better.

Just wait a short while.. 70%+ efficiencies are going to be very attainible with a supercharger... that is turbo territory. MOVE OVER TURBO cause turbo lag will no longer be required to have an efficient forced induction system!

[greasemonkey]

turbo lag is only experienced when the turbo is setup incorrectly or not being used in its' intended range (i.e. is setup more for a high rpm/high load condition). a correctly setup turbo for performance street use will be slightly faster and easier on the short block.

I mean, the 58mm inlet compressor on my truck has almost a second of lag but it's also pumping 42psi into my 5.9L. It's going to take a lot more effort to do that with a S/C. and that's only going up to 2700 rpm. way bigger range to cover with a 6 or 7k redline, that's especially when a turbo comes out ahead as they can cover a considerably larger rpm range.

dang, I don't mean to be all negative about S/C's, I think they're great, I just like turbos a lot better the more info and experience I get with them.

[Bishopjay]

OKOKOK.

What's WOT. stand for.

And what exactly is turbo lag?

Srrry for the ignorance :smt090 But im a painter not a mechanic

[DanO]

Originally Posted by greasemonkey

turbo lag is only experienced when the turbo is setup incorrectly or not being used in its' intended range (i.e. is setup more for a high rpm/high load condition). a correctly setup turbo for performance street use will be slightly faster and easier on the short block.

I mean, the 58mm inlet compressor on my truck has almost a second of lag but it's also pumping 42psi into my 5.9L. It's going to take a lot more effort to do that with a S/C. and that's only going up to 2700 rpm. way bigger range to cover with a 6 or 7k redline, that's especially when a turbo comes out ahead as they can cover a considerably larger rpm range.

dang, I don't mean to be all negative about S/C's, I think they're great, I just like turbos a lot better the more info and experience I get with them.

Well your right and your wrong. Turbo lag is inherent in the design of ALL turbo systems. The degree to which lag is seen depends on many factors. The efficiency of turbo systems is GREAT.. however you always have the tradeoff of minimal lag or power. Lag is the reason you see small turbos on production vehicles . I could go into this for a while.. but i am biased.. ;) I will give turbos the thumbs up for anything over a 2.8 pressure ratio(26psi) because positive displacement SC will not be able to hit that and there is nothing in the market that can do that besides a turbo.

Another thing is that you only have knowledge of the current superchargers.. most of which only do 14 psi (2.0PR)

I will agree that there is nothing that will touch 42psi in the form of a supercharger but turbo's make your throttle unpredictable in the high HP cars.. No throttle modulation untill its very high in the rpm band.

And for the other request

WOT= Wide Open Throttle (means its floored)

Turbo lag = the time it takes from application of WOT to the point that full boost is achieved.. basically a delay between when you want to go and when the car is actually going!

[greasemonkey]

I forgot to mention the boost threshhold, which is often incorrectly called lag(what I did for a long time). Boost threshhold is when the rpm/cfm is sufficient to begin to spool the compressor. So a race setup will not have 'lag' but a higher boost threshhold (yeah, it'll technically have more rotating mass to spool up but there will also be more exhaust pushing it so the difference in actual lag will be near negligent).

lag is only considered when the system is in or above its boost threshhold and is the time it takes for the compressor to supercharge the air from when the proper amount of exhaust gas hits the turbine wheel; so lag is from an incorrect setup.

the beauty of running less than 14psi with a turbo is that it takes very little effort to spool that compressor which means you can get away with a little larger exhaust housing so there's not as much restriction at higher rpm but it'll still spool NOW!

manufacturers set the boost threshhold low because a majority of the turbo'd cars are just daily driven(at least here in the states anyway), puts around town and a high boost threshhold will be annoying and not as practical. and it's easier on the drivetrain and mileage to have low rpm power vs. mid-range/high rpm optimization...dang the bean counters!

[Bishopjay]

When I floor my tuarus it takes like 3 seconds before it really acts. Is there somthing wrong with that

Can you put a turbo in a taurus

[j0n]

Originally Posted by DanO

And for the other request

WOT= Wide Open Throttle (means its floored)

Turbo lag = the time it takes from application of WOT to the point that full boost is achieved.. basically a delay between when you want to go and when the car is actually going!

[Admin]

Originally Posted by 4 cam tbird

They are way ahead of you. The Lightnings and Cobras already recirculate the boost under normal driving conditions so it runs normally. Then when you punch it so the vacuum drops it stops doing that and builds boost normally.

That's great and all, but Ford and Chrysler still need to find a better way to get good gas mileage out of their cars. New Camaro is going to get 30+ miles on the highway. The Challenger and Cobra is going to get low 20 something... Not good at all, especially when you're like me and wanting to get 2 cars. I'm looking at gas mileage and all that, people who say they aren't are nuts, because premium isn't going to be cheap in the future!!!!

[Bishopjay]

Originally Posted by SLP LS1

That's great and all, but Ford and Chrysler still need to find a better way to get good gas mileage out of their cars. New Camaro is going to get 30+ miles on the highway. The Challenger and Cobra is going to get low 20 something... Not good at all, especially when you're like me and wanting to get 2 cars. I'm looking at gas mileage and all that, people who say they aren't are nuts, because premium isn't going to be cheap in the future!!!!

That's true but when people complain about fuel mileage there not saying give me a car with 30-60 mpg there saying lower the got damn gas prices.

Example: In 2001 there where mass protest around D.C about global warming and gas prices. 2002 Fuel economy cars came out and the protest went down about the cars but not gas.There are over 20 styles of fuel economy cars out and lest than 27% are being sold. And the Ford F-150 (a fucking gas gusseling truck) is America's number 1 selling truck and Escalade is the # 1 selling vehicle so do you think people care about gas mileage as much as they say they do. You say your self economy is bad but your gonna get a Mustang(get a black one).

No matter what people say they do somthing else.Simple American ways