Re: What you smoking? Was RE:S4

[Michael Williams <urquattro@surfree.com>]

ScottyCBoy@aol.com decided to speak these words:

>What is major power?  To get a Honda to put out 350 hp you need to stuff it 
>with 30PSI of boost, of course with that kind of power you need a custom 
>head 
>high po bottom end pieces a turbo and a load of $$$$$.  A 5000T engine will 
>yield ~240-250 Hp with a chip change and a trunk full of intercoolers.  An S 
>4 engine will crank out 300 hp with a simple chip replacement, and 350 is a 
>turbo change away.  If you want more than 500 horsepower buy a supercharged 
>mustang or camaro and don't drive it in the rain. 


Look, i never said that honda was all that great either for performance, 
although the NSX is REALLY nice.  They have the same problem, the stroke 
lengths in their cars is very long.  But also, they have no torque 
either...look at the torque peaks for the type R cars and the new Si 
civic coupe.  7000+ rpm torque peaks at maybe 120lbs?  thats insane...

But my point is that because there isnt all that much efficiency in the 
audi engines, especially the I5's, to get a decent amount of power, IE 
say the IMSA engines, with 720hp, they needed to put in 3.0 bar of boost. 
 Look at Ned's engine, 3.0 bar of boost.

If i were to pour a ton of money into the I5, which i probably will in 
the future, i would focus my entire project on increasing the efficiency 
of the engine, bore it out a bit, maybe to 2.5 or maybe a bit more, keep 
the cr around 7-8 and then run about 1.2-1.5 bar of boost.  A friend of 
mine is designing a 4ktq race car, with a 20v and this is what he is 
doing.  He wont even tell me what he is doing, its pretty top secret, but 
i can tell you that when i do a 20v in my car, i will get his help.

Im not saying that audi engines are crap, in fact i love them, but at the 
same time the 10v I5 has alot of problems that are limiting.  For 
example, the intake, exhaust, and turbo on the same side of the engine?  
Jesus, talk about a heat sink for the intake charge.  that is why the 20v 
is so superior, with the cross flow head, it allows the turbo and exhaust 
to be on one side and the intake to be on the other.  That was a major 
advance in the design and makes the engine much better.  But one of my 
biggest pet peeves about the engines, is that they have a cast iron 
block.  For the most part its ok, but it is horrible for heat transfer 
capability and that is very limiting as far as obtaining the highest 
possible horse power.  An aluminum block is simply able to transmit that 
heat much better and that in turn allows for more power potential.  
Weight isnt even all THAT much different, maybe 100-200 lbs, but not HUGE 
like some would think....

The head has many restrictions and the ports are SO small that they 
really dont allow all that much air to flow by.  Plus there is the whole 
fact that the engine is hanging so far out in front of the front 
wheels...we all know that is not all that great for handling neutrality.

I personally like the 20v engine alot, and do think it has alot of 
potential, and i realize that there isnt really any way to fit a hugely 
bored out engine lengthwise inline in the front of a car without going 
crazy....

I was just originally expressing my dissapointment in the fact that audi 
changed the S4 engine for more stroke, less boost, and higher static 
CR...it just turns it more into a family car than a true sports car...

Thats all....

later...

Michael Sheridan Williams
ICQ# 11740998
1983 UrQuattro, MC--1.8 BAR, borla, 16x7.5 OZ Mito's w/ SP8000's, K&N
1985 4000S Quattro miles, Koni Yellows/Coilover (2B), strut brace, Sport 
8000 Tires, K&N
http://members.aol.com/daserde2