I know how turbo's work, and I am a little familiar with the jackson racing supercharger. but the vortech units confuse me. the jackson racing sc gets 8psi at like 1500rpm and holds it till redline. but the max psi is 8, maybe 10 with the upgrade kit. but the vortech units offer a trim on the compressor that is with in the center island of efficiency ( on a compressor map) and put out up to 30psi. does this mean that since it is belt driven it gets full boost at the 1500 or 2000 rpms or does it start low and build to 30psi depending on rpms? also this would mean that if 5krpms meant 20psi then you wouldn't need wot like on a turbo cause the sc is rpm dependant where the turbo is load/throttle position and rpm dependant. am I on the right track or way off in left field?

please shed some light or a link to more info ( I have already read their website)

thanks

 

thats pretty much the idea, a centrufigal sc is RPM dependent...meaning the faster its spun, the more boost it produces(pretty similar to a turbo actually) I have no idea why this is not the case with roots style blowers...but for some reason its instant with roots type(jr sc, or eaton)

 

yeah vortech style blowers, can actually make boost at partial throttle, low speeds, and at very low rpms.

they rate them in "trim" in a very similar way to a turbo, along with sized pullies to get a HP rating.

they can add different wheels in them just like a turbo.


some blowers like powerdyne's and such have a gear reduction system that can get a blower to spin outrageous RPMs.

the only downfall to blowers are they usually fall off before redline, they stay hot, and they require power to make power.

but i do like them, because they are pretty efficient, sound cool, and make power fast

 

I have a turbo setup right now but my car is a daily driver and on the street I don't feel any power increase unless I put my foot in it and then it has a little lag. If the vortech units work the way I think then even if I just give it %50 throttle while I'm at 4krpms then I will feel the power as opposed to a turbo that needs at least %75 throttle. also a 1.6 ltr needs an extreemly small turbine and a big compressor to make high boost, for the track it's great but for the street the response isn't there. I wouldn't do it for a jrsc but a vortech with 20-25psi......I am strongly thinking about it, also the aftercooler will be a must on it. and I will definately get an oil cooler to help out with the heat.

if anyone else has more to add, please do.

thanks

 

"if you have lag son, you aint driving it right" no, but seriously, if you have bad lag then your turbo isnt sized right for your engine, personally my boost is instant(assuming I'm in the right gear to use it) I would seriously think about using a different sized turbo for daily driving

 

how would it lag when all your waiting for is rpm and not rpm+spinning the turbine? the rate at which the rpm increases may not be instant but rpm increase is a lot faster than turbo lag. as for the size it is a t3/t4 .48hot .60cold 57 trim. it is the same size that others have used and isn't too big for street use. I really can't get too much smaller on the hot side and any smaller on the cold side and I won't get 20psi

 

.48/.60 IS too big for street use for a 1.6L-1.8L engine, regardless of what you may have been told, a .42/.48 would be much better sized for your engine, providing much better response, as far as getting 20psi...no a t25 will not produce 20psi...but you yourself said this is for street driving...15psi is easily attainable on it, good throttle response...as far as centrufigal superchargers, it takes time to build RPM just as much as it does to build load, unless your launching at 5k RPMs and staying above that the whole time you will have lag with a centrufigal sc anyway, if you look at the cars they used .48/.60 turbos on stock you'll notice one thing...they are all larger than 2.0L, why? they didnt want turbo lag, I personally drive in the 4k-6k RPM range most of the time when driving agressively...therefore...no turbo lag, if I'm out of that range I do a little thing called downshifting....bam, instant boost

 

well you may have just saved me a bundle on the centrifugal system. I normally stay within the same rpm range when driving as well, just nat neccessarily with full throttle, I also haven't downshifted for fear of popping it at too high of an rpm with a stock tranny and drive train, with the clutch at unknown condition. once I run a built motor/ and tranny then I don't think I'll worry about it as much. I also think some of the lag I felt may be caused my the lack of compression in the cylinders at the time ( 130 was my highest). but since I was reibuilding the motor I thought I would look into the centrifugal sc. from the sounds of it though I would be better off staying with the turbo setup, and maybe after the rebuild see if the lag is still as bad ( if it is then I may step the turbo down a notch), but I am also stepping up the displacement to a 1.8 so that may rid of some lag.

thanks fo the info,