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View Full Version : 1994 Z28 vs 2004 WRX STi


Aaron
03-09-2004, 12:53 PM
Well I met a guy with a new STi, stock. I decided I'd try my luck. Well I got beat. It wasn't as bad as I was expecting though, we did a roll on from 20 to 85 and he only had a car length. At sea level we would ahev been side by side. Then we raced off the line :oops: :oops: :oops: :oops: He had 2 car lenghs on me by the time I got out of first :oops: :oops: :oops: :oops: He owned me. Then we went to a parking lot and he did some AWD burnouts, it was AWESOME!!! It just sun in a circle. Mine looked better thought :wink:

RWD+Posi+Torque=FUN ALL DAY LONG
jeremy
03-09-2004, 01:03 PM
At sea level we would ahev been side by side.


wouldn't both cars be affected by the altitude in the same way??
TeeJay3800
03-09-2004, 02:22 PM
wouldn't both cars be affected by the altitude in the same way??
No, the STi is turbocharged. Which means the Z28 would be affected my the altitude much more.
jeremy
03-09-2004, 02:24 PM
wouldn't both cars be affected by the altitude in the same way??
No, the STi is turbocharged. Which means the Z28 would be affected my the altitude much more.

I didn't know that ....never had a turbo...
Flyby736
03-09-2004, 02:35 PM
hows that work? Either way both cars are packing the same air in the intake. The Z28 just doesnt have the power adder to pack in more. The Z28 would have the more dense sea level air and the STi would have the sea level air plus the density added by the turbo.
TeeJay3800
03-09-2004, 02:42 PM
The STi would be effected by increased altitude much less than the Z28. The turbo compressing intake air compensates for the less-dense air of the higher altitude.

Its hard to explain and I don't feel like typing right now......
Maybe someone else can explain.......
loominaz34
03-09-2004, 03:03 PM
Because of the pressure of the exhaust having to correspond with the boost, it doesn't matter how thin the air is, it always gets close to the same amount of pressure out and therefore, pressure back in. Sorry my explaining skills suck.

simply: Pressurized exhaust out=pressure turbo exerts on engine.
exhaust pressure remains constant--- so also does the boost.
TGPilot
03-09-2004, 03:35 PM
No, the STi is turbocharged. Which means the Z28 would be affected my the altitude much more.

Here is an article why that is true... http://www.turbodriven.com/en/turbofacts/advantages.asp


Because of the pressure of the exhaust having to correspond with the boost, it doesn't matter how thin the air is, it always gets close to the same amount of pressure out and therefore, pressure back in. Sorry my explaining skills suck.

Pressure rates are one thing...the lack of Oxygen is another. At 6000' above sea level we are only at 18.5-19% Oxygen and 81% Nitrogen. At Sea-level the Oxygen is 21% with 79% Nitrogen. You will still be affected with a turbo at high altitude, but not as much as a N/A car because the turbo is cramming air...an N/A car is just sucking the air.

Moral of the story...lower Oxygen levels=less power on either a N/A or Turbo'd car! :wink: 8)
TeeJay3800
03-09-2004, 03:56 PM
Thanks, Kenny. That's a well-written and informative article.
Flyby736
03-09-2004, 06:19 PM
Im not denying that it would be better at higher altitudes to have a turbo, but decreasing the altitude wouldnt have any advantages from an N/A car to a turbo...
loominaz34
03-09-2004, 06:34 PM
I believe that is the most confusing statement not written by me i;ve ever read.
TurboSedan
03-09-2004, 07:25 PM
Because of the pressure of the exhaust having to correspond with the boost, it doesn't matter how thin the air is, it always gets close to the same amount of pressure out and therefore, pressure back in. Sorry my explaining skills suck.

simply: Pressurized exhaust out=pressure turbo exerts on engine.
exhaust pressure remains constant--- so also does the boost.

it's not just air pressure. it's also the density of the air. when i drive my GTS @ 4500ft, it's ALOT quicker than when i'm driving @ 7200ft. i may be getting 12psi at either altitude, but the car doesn't have the same amount of power at either altitude. higher altitude will make a turbocharged car slower. it's not just my GTS either; every one of my brother's turbo dodges is like that.
EurosportZ34
03-10-2004, 03:17 PM
Ahhhhhh....reading all that makes my head hurt! :gone2far:
loominaz34
03-10-2004, 03:35 PM
I was not aware that the oxygen concentration in our atmosphere changed at altitude. I stand corrected.
cutlsp
03-13-2004, 01:45 AM
man why do you think airplanes have to be pressurized? the high you go the less air there is its that simple. oh and i don't know about this sea level stuff i think a little above sea level is better for the cars that salty air can make them rust real fast :roll:
cutlsp
03-13-2004, 01:45 AM
man why do you think airplanes have to be pressurized? the high you go the less air there is its that simple. oh and i don't know about this sea level stuff i think a little above sea level is better for the cars that salty air can make them rust real fast :roll:
Aaron
03-16-2004, 10:45 AM
A turbo car will lose power going up in altitude, just not nearly as much. Have you ever driven the same 3.4L at sea level and at 7000ft??? It is awful. I literally can barely chirp them a few times into 2nd up here, but in El Paso, TX, I had to let off the gas into 2nd gerar cuz I was just redlineing 2nd going 35 :lol: