*cough*

 

Whats up with you and the "rofl" food today?

 

what are you talking about?

 

Roots = Boost in Manifold
Twin Screw = Boost in case

 

Thank you Onyxd.

 

lag between shifts? sounds like they cant drive or its called shifting. have you ever driven a turbocharged car? full boost before you shift, shift, full boost after you shift. no lag. unless your running like a t70 on a d series civic. or unless you dont know how to race and short shift like crazy. the turbos on both those vehicles build boost down low. very low lag to get to boost. they build those cars more for everyday drivability, not all out performance. so they have low lag times.

now either supercharger is a good choice. both create boost within themselves and create less heat then a roots. the centrifugal does react like a turbo which has a spool time. it creates the least amount of heat out of all the superchargers. it is also the most effecient. likes others have said, their are pros and cons to both so you have to weed through what is best for you.

personally, i would go with a centrifugal. if the vortech website was up, i would show you the supercharger i was going to get for the saturn im building, till i decided to completely convert it to something else. its a BIG centrifugal that flows an ungodly amount of air that is big in size, but smaller then all that compare to it.

 

They should have went with a Novi2000 head unit. THAT would be cool

 

An internal compression forced induction system setup to put out 15psi will put out 15psi assuming something does not go haywire with it. Doesn't matter what you change on the engine, the compressor is set to output 15psi. A roots that is spun to put out 15psi on your current setup will put out a different psi if you change something on your engine that makes it breath better or worse.

 

Ok so I am going to post some videos of PROCHARGER setup that speedmafia apperently has on his. and tell me theres no sound of the procahrger.

http://youtube.com/watch?v=WfMGDZbfZzo
http://youtube.com/watch?v=yzDcydqtdWc
http://youtube.com/watch?v=EgtbnbnJlzE


As far as my concerned I am tired of roll racing i want traction off the line for once. Also as i have said before there will be a point were YOU CANT update the whipple you would have to go to a different sc and that will require hood modifications plate modifications and dont forget the snout modifications. The procharger setup will allow for you to go from the c1 to the c2 or more power.

Yes dont get me wrong the roots is nice to have but I am tired of not having options. If i buy something I want to know i wont be just limited to one option and thats it. With the procharger i would have atleast 3 options c1, c2, or back to stock sc for whatever reason i would want. Also If i remember correctly chevy or speed said you can upgrade past the c2 to a monster blower.

ooo ya chevy check your pms/emails

 

Exactly. Exhaust mods will lessen the boost seen on the gauge but that doesn't mean you're not getting 15Psi from the blower.

A 1.6L whipple is PLENTY for our engines. It will blow up a stock internal car and should be used with a low compression engine that can take 18-20psi. It will also kill a procharged car from 1000-4000rpm in power production.

 

That isn't quite right. Both would loose manifold pressure if the engine was made more efficient. The difference is the volumetric efficiency and the amount of "carryback". Lower psi the roots is more efficient.

Example: A roots blower spinning at 16,000rpm on motor "A" moves 600 CFM at 10psi and creates a temperature increase of 10*/psi. Now spinning at the same speed, but on a more restrictive motor "B", makes 15psi moves 530 CFM and creates a temperature change of 14*/psi.

Because there is no internal compression, the air pressurized in the manifold is constantly trying to force its way back into the housing. The air that does make it back in is called "carryback". The "carryback" is heated air that is going to be forced into the manifold again and heated a second time, it also makes less room for fresh air to come in. Higher pressure = more "carryback". More "caryback" = higher temperature change and less CFM the blower can bring in .

If a twin-screw spinning 16,000rpm on motor "A" moves 600CFM at 10psi and creates a temperature increase of 8*/psi. On motor "B" spinning at the same speed, makes 17psi moves 600CFM and creates a temperature change of 8*/psi.

Because the internal compression of the twin screw is higher than the manifold pressure, the air cannot force its way back into the housing. This lets every turn be as much fresh air as the rotors can move and the air only being heated once. Once the manifold pressure exceeds the internal compression, the twin screw starts to suffer like the roots does.

 

Prochargers do not have a "whine" as you so delicately put it as composed to a roots style supercharger..

However it does have a very unique sound to it, and it sounds bitchin nonetheless.

 

To me it sounds similar to a jet. Probably more like a scaled rc jet but oh well haha.

 

A sexy jet at that.

 

i personally love the sound of the procharger at idle and under WOT....at idle it is loud for sure and yes people next to you in traffic will know you have something done for sure...

Also to really wake up the ProCharger a free flowing exhaust and head is the way to go because it loves to flow CFM...

i try not to get caught up in the "PSI" game...well that car makes 20psi or this car make 18psi...etc if this cobalt puts down 300+WHP at 12psi heck that is fine and dandy to me...

it will be like the guys that run around her all upset with there Kenny Bell Cobra's at 18psi and get walked on by a ProCharged Corvette with 12psi...looking seeing there faces when you say "oh i am running 12psi" LOL

But all in all it all boils down to Cost, Performance, and Reliability...and we are aiming for all 3!

But keep up the opinions love all the different ideas and thoughts being shared here!

 

Corvette = 3100lbs
Cobra = 3800lbs

Corvette also has better aero.

So people think they're gonna make 350whp with the procharger on stock internals? Place your bets. One will be blown up within 3 days.

 

How so? He was comparing a KB cobra to a procharged Corvette. It's exactly as he stated but there are other figures to take into consideration.

 

He was gloating because the corvette needed less psi to beat the cobra. If they were of equal weight the corvette would get owned.

 

totally not what he said.. it was just about the PSI, least thats how everyone else took it.... why must you insist on making everything a fight?

he was just saying that you will need less PSI on a blower that more efficient as well as pushes more CFM

 

Well i have hear allot of guys say...you make instant power under 3K rpm...well i dont know about guys but i never race under 3K rpm...if i am launching out of the whole i am well over 3K and if i am running from a roll i launch over 3K so if you want to say Twin Screw will be better for under 3k power then hey i am cool with that while you are trying to hook the tires i will be gone....

i really hate guys who lose a race and make the excuse "i couldnt hook up" well sorry thats not my problem!

So that is why i perfer a procharger or even a little lag from a Turbo over a roots or Twinscrew...you can keep your Tq Monster blower and keep breaking parts and smoking clutches and tires...that doesnt win races, traction and power control does...

Also on that same note...i am a huge Nitrous fan been running fogger shots since 1988 and we had the same problem just like roots or Twinscrew SC instant power = no tractions even at high mph rolls...then the progressive system came out from NOS...made life allot easier!

so i guess i look at the situation of the race...you can still achieve great 60foot times with a procharger....this is from a mustang of course but it launches pretty hard on sticky's
http://youtube.com/watch?v=HutVZ0RsnV8

i just say its best to see what makes the power if and when the TwinScrew comes out and Chevy has his Setup done here real shortly

 

i want the procharger

 

i can't wait to get my procharger...kev you get my email the other day?

 

Unfortunately the Cobalt's really can't launch like that because of horrible wheels hop. And for my case I like to have that instant power whenever I want not for racing, but for daily driving. I like pressing the gas and actually moving without having to downshift.

 

I guess will see real soon! I would like to see a race like that. (twinscrew vs procharged cobalts) but im pretty sure I know hows going to win.

 

wheel hop FTL.. i get wheel hop on my stock 2.4.... it's gehy.. i'm pretty sure my motor mounts are shot to helll