How come?

[bluev6]

I really dont get it. How does a turbo charger like shane's make his car go faster with 7 psi than a car thats supercharged thats running 7psi?
I mean isnt 7 psi, 7psi, no matter how you get that amount of boost.
Im confuzed [img]graemlins/crybaby.gif[/img] :(

[ReodDai]

Nope 7psi is 7psi but depends on how early it occurs and how long it is maintained. Would depend on the setup.
Not to mention the other mods the car has, the driver, the track and many other things that don't revolve around the forced induction components.

[ November 03, 2003: Message edited by: ReodDai ]</p>

[Shirl]

Also, it's intercooled boost. That probably adds another 50 horse or so.

[Silver98Maro]

Turbochargers are more efficient than Superchargers, superchargers use horsepower to power itself.

Or if that's not the case, someone please shut me up. :D

[lord_gufi]

depends on what super charger it is, some take more to turn than others, most of the ones on the v6's can be turned with your hand.. imagine how much hp your hand creates... Not a legitamate amount to say its much less efficient than a TC.

7 psi is NOT 7 psi. 22 psi from a stock t-25 on a DSM will get you pretty much nothing other than Hot air at really low CFM rate, however a t-4 with a nice size wheel will get you 22 psi and probably blow most engines from the amount of air it flows.

Shanes gotta nice setup, every thing is based on Compression ratio, Flow of the turbo/super, and the intercooler.

the l67 has a lower compression ratio and that makes the combustion alot different.

shane has a higher compression ratio making every thing give him much more power, however his tuning ability is cut some what short and needs to be correct because he wont have as much room to make mistakes. Its not a HUGE difference in tuning but its there if you know what I mean.

[ November 03, 2003: Message edited by: lord_gufi ]</p>

[Tiago]

cause turbos just plain ownzjoo

[Wicked 3800 V6]

Word. Ownzjoo. Specially when you can launch.

[Lord_Verminaard]

It's all about torque. They way torque hits on a turbo car cannot be matched by anything else, except for maybe nitrous. If you look at a dyno plot of a turbo car (use a VW 1.8T for example, since it's very easy to see) (link- scroll to bottom to see dyno plot) The dark blue line is torque- The torque shoots up to max right around the same point boost is maxed. That torque stays mostly flat throughout the duration of the engine's powerband. All of that area under the torque curve is pure GO POWER! [img]smile.gif[/img] Supers slowly build boost throughout the RPM range and make max power around the same time max horsepower of the engine is made. Supers can be extremely fast in the 1/4 mile, but most of us dont have the capacity to build a super to that capacity. The powerdyne is a great street setup but you would need a charger putting out around 15 psi to equal the amount of "area" under the torque curve that a turbo with 7 psi can do.

Brendan
2000 Camaro L36 M49

[Shane]

<blockquote>quote:</font><hr>Originally posted by Tiago:
cause turbos just plain ownzjoo<hr></blockquote>


you forgot Auto turbos just plain ownzjoo :D


as for the tuning....i have pretty much everything to tune my car at home so it is pretty accurate.....i have a Wideband setup, Autotap, MAFT+......all i need is a dyno in my garage [img]smile.gif[/img]

[njspder]

a turbo also will have a bti mroe trap speed with teh same amount of boost because thre is no parasitic drag on teh motor. for a super to turn the motor itself has to turn it. as you increase teh speed of teh blower it creates more and more resistance(just think about those old excercise bikes that were just big fans, the faster you tried to peddle the harder it got to turn) where as a turbo is using the "waste" that is in teh exhaust stream to create teh boost. other than a bit of an exhuast restraiction the turbo does not use any power to produce boost.
it is more a matter of efficiancy than actually being capable of producing more cyl pressure internally.

later
tim

[Mikael]

This thread should just end here, since there has only been one hit on the dartboard, about a mile from the bullseye.


It has to do with efficiency. Put an F3R on your V6 at 7psi, it'll make more hp/tq than any car on this forum.

[bobrules]

It's not boost, its CFM of airflow. Same thing as an intercooler, you want a combination of efficiency and flow.

[Tiago]

<blockquote>quote:</font><hr>Originally posted by Mikael:
This thread should just end here, since there has only been one hit on the dartboard, about a mile from the bullseye.


It has to do with efficiency. Put an F3R on your V6 at 7psi, it'll make more hp/tq than any car on this forum.<hr></blockquote>

lol, agrivated?


This topic has actually been explained many times in detail in past threads, do a search.

[Tiago]

just to recap real quick a post I just recently read about a guy that had a built small block and went from a hefty centrifugal blower to a nice turbo... back to back dynoing here is what he found:


"the boost curve on teh blower was pretty linear, but the turbo just came on real smooth and early on, which made the car feel insanely faster. Although it only gained 150 or so rwhp/tq going to the turbo from the supercharger at peak power, what really impressed me was the rest of hte curve [img]graemlins/evilgrin.gif[/img] Everywhere else on the curve gains were in the 300+ rwhp/tq range. I was extremely impressed with this. This is due to the turbo reaching full boost at much lower rpms then the blower ever could. This yielded a much stronger power curve, and the tq is crazy :eek: "

[xjarayax]

i think on these boards we can just stick with the turbos just plain ownsj00 answer.