stretch-d

Well, 25 years of experience holds quite a bit of water in my opinion. I'll take his word for it unless you can prove that he's wrong.
Also, why would anyone want to over-complicate an already complex subject. The equations and guidelines found in that book provide a usefull reference for people getting started. The answers to the questions that most of the people on this site ask are in that book. To steer people away from this resource in an injustice to the aquisition of knowledge on this subject.
Besides, the calculating side of turbo system design is to get the designer in the ballpark of where he wants to be. Real world testing & trial & error are what goes the distance.
Somehow, even though Garrett hasn't released all the info on their turbo's design...People are putting together great turbo systems.
Let the people decide.

sean88accord

Alot of turbo systems just straight out suck. thats the plain truth of it all.

Also corky bells 25 yrs of experience mean nothing to a guy with a 1.6L vtec engine with a VE capablity per liter hes never seen.

then again engine design and cylinder head design have changed oh 100 fold over the last decaded and theres been a revolution in head flow.

Also never mind the fact that the new GT series garret turbos look really promising for the future ( if there prices come down) becuase they are low restriction turbine housings.

the thing is and Yet again you dance around this peice of commons sense i keep bringing up. You want to run the largest turbine housing you possiably can on your engine and still get the turbo to spool up and behave properly. Theres only one way to do that. Punch and crunch some numbers.

If you have a big lopey cam and its got an extremly high rpm oriented grind on a b18 your not gonna put a turbine housing and wheel combo on that would only be able ot breateh to say 6000rpm when the cam and the rest of the running gear are targeted for peak HP around 7500rpm are you ?

Its this type of ( eveyrbody else does it ) ignorance thats pis's me off. IF you knwo what you need up front then you buy the right stuff the first time Youll be happier with the end product itll go faster make more HP and COST LESS TO BUILD becuase you bought the right parts the first time.

stretch-d

The dispute was not about the correct points of your post. It was about the incorrect points.

No matter what engine you have, the basic measurements of cfm, rpm, temperature and turbo size haven't changed.
If you're running a 750cc motorcycle engine or a 12 cyl. Ferrari engine, the process and calculations of turbo selection are the same.

If you have a head that flows more cfm than another, you just adjust the number in the equation accordingly. But it's the same equation. By saying that calculating procedure has changed over the last decade due to increased headflow capacity...in essence you are saying that Algebra has changed. Not true.

Question: Do you think that the people that design turbo race cars (Indy or strip) choose thier turbo's dimensions with calculations only? Do the figuring but don't assume that you're finished.

More times than not, an adjustment will be made to get it "spot on". This site is filled with people
making changes to their turbo's dimensions.

A lot of people have a difficult time with this subject for several reasons including (but not limited to); common misconceptions, inacurate info, lack of research, lack of patience and lack of funds. The result: A lot of turbo systems that just plain suck.

Why blame Corky Bell for that?

sean88accord

Im saying and to sum it up. the design of turbos,heads etc has changed over the last decade in a substial enough manner to warrant looking at the calculations to determine proper turbo size.

IF youve been following the changes in turbo design over the last 10 yrs youd be vastly aware of the fact that exducer design has changed termendously.

And again. Corky bell states that his book is a rough over view on the subject of turbo charging.

Yes with testing youll find the best turbo but if you do the correct math with modern design turbine wheel and housings then youll end up with a much beter combination of parts that makes more ouput per $ spent.


im done arguing with you. Obviously youve decided that Corky bell knows everything. Im simply suggesting to think out the aproach in a more thurough mnner. I dont have the time or nergy to sit here and discuss everybodys turbo selection. Im simply encouragin thought on the subject. the more well thought out your turbine housing selection the more power youll make per $ invested.


Just think !

stretch-d

I didn't know that we were arguing.

I thought it was just a good debate on a subject we obviously are both interested in.

I would like to wish you & everyone on this site a Merry Christmas. So no hard feelings.

I hope Santa brought everyone the turbo parts that they wanted.