I dont smoke nothing, but I do have some jello.

any way whats you saying can handle like 30psi of boost about 400hp maybe more. I'm talking about like 8psi of boost. CAN you nitro the existing engine, this one, YES. safe max nitro is 30%.
then atmosphitick presure is 14.7 psi. then it can handle around 5 psi safely. thats be 30%. then 130hp becomes 169hp.
thast a diference between a V6 and I5.

the 10:1 can handle 5 psi, wouldn't you say. no big modes requrie.
whats you said is about serious where the engine is pushed to max.

math::::
temp raize @ 8psi.
T1=70F+460=530R
P1=14.5psia
P2=8psi + 14.5psia=22.5psia
T2=530R x (22.5psia/14.5psia)^0.283
T2=600.1729R=~600R
T2=600R-460=140F
temperature rise of +70F <<ideal

lets asume that turbo runs at 70% eficiency
then 70F/0.7=100F
then inlet temp be 170F

presure ratio be only 1.55

okey we got that, then
flow:::::: engine displacment is 2.3 L at 3000RPM be 100CFM if the engien works at 80% eficiency. so lets see at 6000RPM it be 200CFM thats for NA engine
then
the density of air would be 1.35 @ 70% eficiency
then
100CFM x 1.35 = 135CFM
200CFM x 1.35 = 270CFM
now lets choose a turbo.
lb/min = 14.4718 cfm
then 135CFM/14.4178=9.36lb/min @ 3000RPM
then 270CFM/14.4178=18.73lb/min @ 6000RMP

the GT2554R goes right there, but on the minimum
the GT2560R is much better, almost in the center of the eficiency %70-73
the GT2860R is there but slightly sucks
the GT2252 is there also but pushish the limits and its higher that 70% eficiency

I would go with GT2560R its medium size. but others like GT2252 will also be good.

also the KKK line can be used but Garrett is much more likly to be found easierly

 

Nice, numbers and formulas![sm=smiley32.gif] Which book or magazine did you copy it from? AND you only have half of the equation figured out.

Now how about you do some strengths of materials calculations and figure out how long the engine is going to last especially on a hot summer day? How much psi does a stock cast piston can handle versus a forged piston? What is the temperature of the exhaust valve and the temperature when it starts to "tulip"?

So far what I have mentioned is not running 30psi of boost but what factory turbo models from Japan and Europe come with and that is running 0.5 to 1 bar of boost. The components that I have mentioned so far are pretty much standard items that just about every major automaker uses. To run 30psi of boost on a 2.22 Audi motor requires quite a lot more modifications.

Can you hook up a just leaf blower and get a few more ponies, sure you can! Will it be reliable and last, hell no!

 

this formulas are for calculating turbo sizing.
any way, you say the stock compresion is too high. well yes it is.

the exaust temperature is only defined majorly by the ignition and the A/F ratio. to advanced ignition can couse detonation and colder exaust, to retarded ignition couses low internal presure and higher exaust temperature. the exaust should be below 1300F thats 700C and higher that 1000F thats 540C
it can be simply tuned with piggy back.
the 7.8:1 compresion holds 1.4 bars stock thats 21psi on audi 200 and 5000 models dont know about the S4
the 8:1 campresion ration is suficient enough to hold 30 psi with forged internals with the fuel premium.

Consider this, the V6 with a PES supercharger without intercooling can pull 8psi thats 50% increase of real power

 

The difference between PES, Paxton, or other aftermarket forced air induction kits are that they are designed for easy installation and limited or average use. Where they fall short as opposed to fully developed OEM unit is long term reliability. You can take a factory Turbo and run full throttle for at least 24 hours non stop and have no serious internal problems with today's turbo motors. I think that both SAAB and Subaru ran long term tests to prove the reliability of their turbo models. I have even heard of one manufacturer doing a full throttle 24/7 test without a breakdown. I am not sure if any of the kit makers can make the same claim. And by no means are these kits cheap!

 

cool, tnx offramp for the info.

PS usualy I give options, and alternatives. No offense.

 

what about a 1992 100S with an AAH 2.8L 12V with 10.3:1 compression, how much boost could it hold safely?

 

about 8 or 9 psi, ends up to area around 300HP.
Thats what I will do but will start from 3 or 2 psi move up to 5 then check 8 and 10 psi and move back to 5 psi.
also I will sell as a kit, the replicas. thats gona come soon during summer of 2007 couse I seriously scruided up unm summer 2006 so, it should be soon.