To Turbo Or Supercharged That The ????

[ZahirAbr]

Hey guys, got a problem deciding what to do, im torn between 2 lovers, what do you guys suggest, turbo or supercharging my M3, my mission in this life and after is to run everyone who wants to take me on, good advise would be apreciated, thanks

[ILiveToRide]

Are you just one of those who race straight line, go turbo. More effiecient.
If you care about driving, supercharger.
If you really really care about driving, you do neither and spend the money on chassis/tires/brakes etc.

[Rick'sm3]

A supercharger is definatly more reliable on m3s, you can get 40%-50% of an increase on your horsepower from a good supercharger, also they always seem to be cheaper and have less lag which can give you that extra edge when street racing. Also a turbo requires a lot of work and keep up but still looks really cool and sounds even cooler, i heard that out of a turbo at the same price of a supercharger, which is a good $5000 easy, you can only get 30%-40% hp increase. Plus turbo lag pisses everyone off.
But good luck you'll be happy with either.

[abradic]

My cousin has the AA SC kit. If you want an M3 that feels stock, but very fast then get that. The SC is fast off the line, but man you really notice the difference up top. From 80 mph on that thing just goes. Never drove a TC M3, but I have seen some vids. Holy cow, talk about power. It seems like once it's spooled, it's gone and the spedo on the vids went from 60-150 mph in no time flat. I don't think turbo lag will be that bad with an M3 because it has decent low end torque and revs up pretty quick. The EVO's and STI's are small 4 bangers so the lag is unbearable with them. The M3 seems to have torque throughout the range, and once spooled up with the turbo, man, look out.

[Highboosted]

Lag is from a poorly setup system....and overrated at that. Turbo design has come a long way from that laggy 80's. The term "turbo lag" is only spoken by those who don't own turbo vehicles.

If you have less boost at any RPM with a turbo vs a centrifugal supercharger of equal power production, then whoever built and tuned your turbo setup should be shot.....in the groin.....then in the head.

I have an 8:1 motor, so off boost power is non-existant, but even then I don't have any lag, because I chose my A/R and compressor sizes carefully. I create a tad over 300 lb/ft of torque at 3K RPM, have full boost (pump gas-15 psi) at 2,500 RPM, and can actually create boost at 1,500 RPM.

Back to the lag thing, there are different things that are confused and therefore are called "lag" by turbo newbies. Transient response time, boost threshold, and wheel inertia are just some. Once you get to know them, you realize that its you who is causing the mythical "lag", not the turbo.

The you begin to realize that boost is opposite of what you want. You realize that turbos and superchargers do not create boost, only your engine's lack of the ability to flow as much as the device creates boost.




Sorry for the rant, but I just might be a little biased....so the only advice I can give is do your homework, and you will be happy.

[fire4adrymouth]

good stuff... Im slowly leaning towards a twin screw, or centr. SC custom setup. keep the info comin guys.

[ryno20005]

Originally Posted by ILiveToRide

Are you just one of those who race straight line, go turbo. More effiecient.
If you care about driving, supercharger.
If you really really care about driving, you do neither and spend the money on chassis/tires/brakes etc.

you would want to reinforce the suspension anyway, to handle the initial stress

[Rick'sm3]

i really here a twin screw is good, if youve ever heard one it sounds like an rc car but i love it because people that dont know much about cars will think your car is shotty and try to race, go with twin screw i here good things

[Rick'sm3]

i really here a twin screw is good, if youve ever heard one it sounds like an rc car but i love it because people that dont know much about cars will think your car is shotty and try to race, go with twin screw i here good things

[SaLto]

Taking a rotary is good but, he delivers more power in low rpm range, and the torqe amount is good, but what to doo when the pointer goes ower 3,5-4k rpm, because the rotarys are not build for high rpm range???

[Highboosted]

Roots and screws are just fine above 6K RPMS, just ask any Kenne Bell or 03+ Cobra owner. The faster you spin it, the more boost.

[SaLto]

U were right but onley for the Whipple Twinscrew, Roots, i dont think so!!

Look at this:

http://www.coloradocobras.com/whippl...son-chart.html

http://www.superchargersonline.com/content.asp?ID=76

[Highboosted]

http://www.timskelton.com/lightning/...ost_curves.htm

Actual numbers, not opinions.

yea, roots looses some efficiency at high RPM, but it does boost just fine up there.

[ZahirAbr]

hey thanks for da info, being new at the game cud u pls tell me what a
AA SC Kit is?
Thanx

[hms94gsr]

lol...AA SC=Active Autowerke supercharger go to there site http://www.aatuning.comi myself am looking to get the AA twin screw kit for my M3.