a very loose description that probably shouldn't be listened to:

roots= low end
turbo = mid range
centrifugal = top end

 

That's funny Dave. I like that. Don't listen to me but let me post it anyways!

 

hahahaha..it's like about everythign i post then :D

 

i'd use a centrigfugal on a chevy 350. they've got enough low end by themselves.

 

it is said that an estimated 10% engine life decrease occurs with use of a turbo.

any guestimations on a supercharger's decrease in engine life rotarygod? (as far as a percentage)

and i still continually hear everyone say turbocharger is faster low end, no no supercharger is faster low end. but if you (rotary god) say that low end power is sacrificed with a supercharger due to its strain on the drivetrain, then are you implying that it IS slower on the low end? if so, i'll believe you and stick to my gut, which is telling me to turbocharge anyway. but i do like the fact that superchargers are supposidly more reliable and durable... meaning i have less fear that i'd be blowing my money. *i'm not rich, i just want speed, and i'm not going to make the wrong decision*

on a last note, i just figure there would be JUST as fast a lowend speed response on a smaller turbo like the greddy. seems like it would spool up faster than a larger turbo. ALSO, ONE last question. if you alter the psi on any turbo, does it in any way affect the spool time?

P.S. if anyone can find me 0-60 estimates for the turbo and supercharger and the quartermile that'd be helpful. or top speeds for either too. (saw once that the greddy turbokit supposidly takes it to 5.3 on 0-60 and roughly mid 13's on the quartermile.)

 

and axial flow = ? (seems like it would follow the stock feel, but really pick up in the mid-upper range)

 

Thank you Therm8 I hate being left out. However this discusion is a lot broader then those few lines. I have, and Rotarygod has writen on this extensivly elseware. There is no such rule that says what runs and what ruins an installation. It all depends on the engineering and adaption plus of course the tuning.
Lets not run this guy down the wrong path with to general of theory.
No one here is going to give or be able to give you pat answers, there is always the exception that ruins any strict statment. Allow me to indulge myself and recomend you read my thread on the axial flow supercharger. In there you will find arguments from everyone on all sides but you will get very good information from qualified people such as Turbine_pwr, rotarygod not to mention myself. There are references to books and articals, It's a lot of reading but you are asking for a big education.

I admit there are some off topics in there but it's a small price to pay for the answers you will get to the big question. In the end you will not have the solid one word answer you seek, but then again you can't find the meaning of life unless you clime a big mountain and ask a very old man.

The best you can do is wait about 10 years and go back and put together all the different combos that were built in a decade, drive them all and decide for your self. Then get Scotty to beam you back into this year.

 

*mulls* I think I'm realizing the true nature of this beautiful self-induced educational misery I'm about to start putting myself through. Your brains are certainly carving the right ideas in my head... so, I really do appreciate the help guys.

I'm going to be miserable until I get past my 50k warranty and buy my kit. No doubt I'm feeling in the turbo club thus far....but this is only at the beginning of my research.... Honestly, I'm thinking I'd rather just buy a nearly worthless beater car for 400-500 bucks and just take each part a piece one at a time and put it back together. Kinda looking at it like a college class. I'd really like to understand an engine and a car entirely before I even get into this turbo thing... I mean, I want to know everything about cars. Any suggestions on an ideal car to learn on that might be old enough to buy right now that's got *no doubt* 150K+ on it?

 

Go find a first or second generation RX-7 that needs a rebuild. They're pretty cheap and taking a 13B apart and putting it back together would be a great way to learn the way of the Wankel. They're lots of non-turbo 7's with >150K miles on the clock. Go look at the for sale section over at rx7club.com for numerous examples. Just stay the heck out the lounge.

 

muchos gracias

 

oh, btw, even though i want to learn about my rotary,... i also think it may be prudent to start on a more conventionally set up, yet simple car. perhaps an old car with a 4cyl or a 6cyl. agree?

 

There is no engine simpler to learn than a rotary. A conventional poston engine is far and away more complicated and still won't teach you anything about rotaries.