rccthitman

what turbo will give me the most horsepower and torque on my 00' a4 1.8t???

Audi2ptzero

The GT28/T28 size is about where the tq/hp levels will be equal. Once you start to move into the GT30's and higher the hp will go up while tq will go up much slower.

A400

If you mean peak, and not area under curve I dont know, there are plenty of others who pursue that dream. Area under curve, I have some ideas for very hi output cars but the turbo will be the least of your expenses if you are wanting what I know about (~ 500hp). If you are looking at that type of level I can help you, I dont know much about the smaller stuff (do a direct mail to me if you want the big hp info). But I will tell you this, the fastest cars always have the most area under the curve, not the tallest peak. And a car that has square output (400hpx400lb. ft) will always be faster than a 450hp x 350 lb tq. This has been my experience anyway. Flat curves are hot peaked curves are not.
Rod

Audi2ptzero

Area under the curve only matters if you play in that part of the power band.

A400

When you play on the level we play on you wind it as long as you get power, and unless you have installed a solid cam lately your playing field is up 2 8100 rpm like mine. I stand beside my observation as do a lot of others. For us the area under the curve (and when my car is accelerating it is only below 4500 rpm once - in 1st gear) is from 4-4500 to 8krpms. I would rather have a car that pulled 350hp/tq from 4500 to 8000 than a car peaked at 420 and only maintained a higher level for 5-600 rpms. And you also know that torque is what accelerates the car.
Rod

Jamez

"And you also know that torque is what accelerates the car."

-> this is wrong.
Assume two equal 3000lb cars, one makes 100mph at 10000rpm, other makes 100mph at 5000rpm,
the first make 250tq@10k, other 500tq@5k.
Both cars will accelrate equally strong at this point cause power is equal ! Power accelrates the car!

A 12000rpm car does not need a square tq/power curve, as long as it has wide enough powerband that is useful... (250tq @ 6-12k rpm is just as good as 500tq @ 3-6k )

Jamez.

A400

Find an Audi that winds to 12krpm and I agree

Audi2ptzero

and makes more hp then tq.

If you put your 2 cars that were at equal weight, the one with more tq will be a little quicker in the 1/8 mile but the higher hp car will make up for it in the top end.

When I drag race I am never below 4500/5000 rpms once I launch, I only take my car to 7800 rpms at this point and have a 2.8 gear box with the taller gears.

Jamez

but the Tq then of course makes the HP, so its pretty much same **** different wrapping

And of course I know we wont see a 12k rpm 20valve 4cyl haha

I think we agreed

a_o_smith

depends on where you want the number...id look at tq/hp curves and see what best fits your needs