500hp turbos- part 2

[Rocco]

Billet wheels are stronger at least,right?

[driftin jo]

you will never get a old style 20vt il5 to breathe as well as a new engine, its the engine thats holding up the turbo

Sorry but that statement is complete nonsense,
with head work the old i5 can easily out flow a modern
engine. If you dont believe me have a look at JP's build
thread and see the VE curve.

[popdemonic]

Most gain of the billet wheel would be psychological, it sure looks good.

oh yes Thomas ,that definitely gained over 100hp with its look lol.
Personally i never expected any gains on hp that much with the
blink blink wheel but the stock has been bitten some dust and
has some slightly chips on the fins that was the good time
to replace it with billet's but it's great to see it spools up little
earlier than stock wheel.

[Thuppu]

oh yes Thomas ,that definitely gained over 100hp with its look lol.
Personally i never expected any gains on hp that much with the
blink blink wheel but the stock has been bitten some dust and
has some slightly chips on the fins that was the good time
to replace it with billet's but it's great to see it spools up little
earlier than stock wheel.

Pop, sure there is usually a small gain in spoolup because the stronger billet wheel is machined thinner than a cast wheel so it's lighter. Depends of the design/layout, usually they also give a little better flow than the stock wheel.

[Quattronaut]

Read here Quattronaut
http://www.s2forum.com/forum/showthr...=47037&page=17

Uuuhmphhh...hm. Let me come back again to that idea with the running hampster inside the comp wheel

Maybe because was done in winter time and near 0 degrees outside?...98 octanes

May play a role. But does not explain Dmitry´s contradictory statements. Whatever...not to be commented by me.
But as told- for me it is a real good charger, but not for really more than 500 hp.

Using E85 is perfectly normal fuel in countries who has it available. I wouldn't consider it as "dope" like NOS.

I live in germany; here it is less available. I even don´t think, that motors are constructed for it- but since I am not really much into it, I might be wrong here. The reason, why I prefer the discussion here based on "normal" fuels is, that this is available and known everywhere, and everyone knows the results when using it. It´s only about comparability- now one can really tell you exactly what will be the difference between 95oktan super and E85 on the same motor. Especially when it is tuned.

[Quattronaut]

Guys- at the threads beginning DIESEL DES suggested two lists- one with turbos that need modified motors, one on stock motors for 500hp. I for myself would have problems in defining them, ´cause so much can be done on a motor, so many ways to improve...

Considering the difference between DD cars driven in town and traffic, and track or race/ drag cars, I would suggest one list with turbos that can reach upt to around 500hp with best possible lag and spool behaviour, and another list for those who wanna run off limits and say "I wanna clearly brake the 500 limit, doesn´t matter if there is no power below 4500rpm". Thoughts?

[driftin jo]

Guys- at the threads beginning DIESEL DES suggested two lists- one with turbos that need modified motors, one on stock motors for 500hp. I for myself would have problems in defining them, ´cause so much can be done on a motor, so many ways to improve...

Considering the difference between DD cars driven in town and traffic, and track or race/ drag cars, I would suggest one list with turbos that can reach upt to around 500hp with best possible lag and spool behaviour, and another list for those who wanna run off limits and say "I wanna clearly brake the 500 limit, doesn´t matter if there is no power below 4500rpm". Thoughts?

My thoughts are that all engines need to be modified for 500hp with a minimum of rods being upgraded and compression dropped for regular pump fuel, so the whole premise is flawed.

[repo]

Most gain of the billet wheel would be psychological, it sure looks good.

I beg to differ here. Although You admit it Yourself in later post, at least partly, but I'll rephrase anyways:

Billet wheels are lighter, this is true. The cone in the middle of compressor wheel is significantly smaller in modern billet wheel designs than in the cast opponents of same dimensions. Hence they have more flow area, and obviously more flow capacity. IOW if cast and billet wheels same dimensions, billet wheel has longer blades.

[vti2]

Guys ist all in the tune. Yesterday i Drived an S4 with a GT3582 on E85, the Car made 637hp on Dino, it has 1 bar at 3000 rpm's, 2 bar at 4000 rpm's and fullboost 2,3 bar at 4300 rpm's. Go like Crazy. The Car has 8,0:1 Compression Ratio, upgradet rods, a PK EM, 4" Exhaust 2 bosch Pumps and 1000cc injectors.
Ist ist Running on a Vems.
On E85 you can reduce lag pushing the Timing to higher Levels. On 102 Pump Gas you can only go to 22 degrees Timings advance on E85 we arme Running 30 degrees advance without Problems. That Makes a Big diference on spool and HP.

[popdemonic]

yes, Im running 31 advance timing on E85.throttle response is far way faster w/o knock.

[Audiboys4]

Audi RS2 : Garrett GT3076 AR82, 4" antisurge
Wagner RS2 EVO KK flange,
8,5CR
750cc EV14/Bosch 044 pump
3" Miltek exhaust without cat
mildly ported head with original cams
Original IC and Airfilterbox
Autronic SM4 PnP

[Thuppu]

The PDF's doesn't work.

[Audiboys4]

Changed it

[Rocco]

Changed it

Only 453HP at the flywheel?
Or is this at the wheels?

Because is a GT30R, right?

[Audiboys4]

On the wheels......