Rule: If you have no lag, you have no turbo. You also have no huge torque increase to look forward to.

------

It is most unreasonable to claim that a 500 bhp street turbo car - which, given full throttle in second gear, has the ability to create tire marks in directions perhaps other than those intended - has a driveability problem.

------

[On the "laggy" 911 Turbo:] Porsche, therefore, should be credited with doing a fine job [of turbo selection]. Nissan should be credited with selling a large number of cars to a large number of people.

Rule: Never send a child to do an adult's job.

Brandon

 

I have his book. Still haven't gotten around to reading it yet.

 

Real Good Book.... Really smart character, I bought a 1c kit from him in like 1990 for my 1st gen. Made a grip of power for that time, and the car ran mid 12's on radials!

 

have you even been in a 930 porsche? boost hits very hard at 4500rpms and the car pulls like a ****, then you shift revs drop to 3000-3200, boost drops to zero, it feels like 10 seconds before you hit 4500rpms and it takes off. repeat every gear. they either selected the wrong turbo, or the wrong tranny

mike

 

the book is pretty good i guess.

I wish he went into more about reading compressor maps.

I'm stillnot quite sure how to figure out the pressure ratio of a rotary engine.

i skimmed the section.

 

pressure ratio is (14.7+Your Target Boost)/14.7 That will give you the pressure ratio for example if you were at 1 bar or 14.7 psi, your pressure ratio will be 2.0, now when you look at a compressor map figure that your peak HP requires about 10lbs of air for every 100HP, so from that you can determine which compressor wheel will be the most efficient. Hope this helps

 

My favorite quote is from his Supercharged! book:
"No one can go fast on a fuel system that is not calibrated correctly, and no fuel system in existence can be calibrated as accurately as modern electronic fuel injection. For this reason, EFI is the only fuel delivery system discussed in this book."

His supercharger book covers how to read maps in lbs/min.

That's because his math isn't exactly correct. However, the info in the previous post will get you close enough.

BTW, the cfm airflow rate equation in Corky Bell's books is for 4-stroke piston engines. In order to make it work for rotary engines and 2-stroke piston engines, you need to either remove the 0.5 from the equation, or simply double your results if that is too confusing for you.

 

Rule: Turbos make torque, and torque makes fun.

 

An unwritten corollary:

Revs make horsepower, and horsepower is fun, too.

Brandon

 

thank everyone... that just cleared everything up for me.

Time to go turbo shopping
=)

i give this thread 5 stars.

 

Hear hear! Excellent quotes indeed! My friend has that book, maybe on a rainy weekend he will lend it to me