Supercharging vs Turbocharging - Ferrari Life
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 06-24-2010, 09:57 PM Thread Starter
Administrator
Owner
Elite Member
 
Boxer's Avatar
 
Join Date: Apr 2004
Location: UK & Texas
Ferrari Life Posts: 15,131
Supercharging vs Turbocharging

Between Supercharging and Turbocharging, which is easier to retrofit to an engine?

Pros and Cons of both?
Boxer is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-25-2010, 09:44 AM
Owner
 
Brian's Avatar
 
Join Date: Jul 2005
Location: Austin Texas
Ferrari Life Posts: 1,833
Quote:
Originally Posted by Boxer View Post
Between Supercharging and Turbocharging, which is easier to retrofit to an engine?

Pros and Cons of both?


Neither are easy to do well but many do both badly. It really depends what specific car and engine combo you are talking about.
Brian is offline  
post #3 of 7 Old 06-25-2010, 10:08 AM
Owner
Elite Member
 
cribbj's Avatar
 
Join Date: Apr 2010
Location: Houston
Ferrari Life Posts: 2,196
I'm no expert, but I can give you my thoughts from an owner & tinkerer point of view.

IMO, a positive displacement (Roots or twinscrew) type supercharger is much easier to fit than a turbo, on a Vee engine, because only the intake side of the motor needs to be worked on (unless the exhaust becomes too restrictive "as a result of" the supercharger, and then needs to be enlarged). This situation tends to reverse itself on an inline motor, where both can be difficult to fit......

Turbos involve mods on both intake & exhaust, and it's often tough to find room for them and their piping. A PD supercharger in the Vee, quite often doesn't take up much more room than a stock intake system.

At the risk of being called out for generalising, superchargers (PD type) produce great low end torque, but turbo(s) produce better high end HP, because their parasitic losses are less (on a well designed system). The torque curve for a supercharged car is typically nice, flat, and fat. The torque curve for a turbo car rises with RPM & load. It's the flat, fat part that greatly increases the fun factor.

You'll lose from 8% to 10% of the gross HP driving the supercharger, but the boost is instantaneous (and very addictive), not like a turbo, which, depending on its sizing, may take awhile to spool up.

A well sized, PD type supercharger will truly make a smaller engine "feel" like its 1.5 to 2.0 times larger.

I have no experience with centrifugal superchargers, but IMO, they are little more than belt driven turbochargers.

Here's a vid of the last supercharged V8 we built:



This is a 4.0 liter, all aluminum, DOHC Lexus V8, to which we added a twinscrew supercharger and it made 498 BHP to the dyno @ 6900 with around 20 psi of supercharger boost. We kept blowing the exhaust off the motor, and the flames you see at the end of the run were the clue why we weren't making more power. On teardown, we "discovered" our cams had around 12 degrees more overlap (at the cams) than we thought, so we were afterburning a significant amount of methanol in the exhaust headers.

The next motor is nearly ready, and should do at least 600 if not 650 to the dyno, and hopefully, with less boost.

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

Maranello Skunkworks Team Member
cribbj is offline  
 
post #4 of 7 Old 06-25-2010, 03:54 PM
Owner
 
mk e's Avatar
 
Join Date: Jun 2010
Location: PA, USA
Ferrari Life Posts: 4,439
Quote:
Originally Posted by Brian View Post
Neither are easy to do well but many do both badly. It really depends what specific car and engine combo you are talking about.
+1

As a very general rule turbos work out best for roadrace type applications and PD superchargers for street, drag, autocross apps.....but there are a lot of exceptions.

I guess the question is why are you thinking of adding boost and what do you plan to do with the car?
mk e is offline  
post #5 of 7 Old 06-26-2010, 01:37 AM Thread Starter
Administrator
Owner
Elite Member
 
Boxer's Avatar
 
Join Date: Apr 2004
Location: UK & Texas
Ferrari Life Posts: 15,131
Many thanks for the insights.

Application would be for mostly street use and a bit of track time. Idea is to add bhp cost effectively without adding much weight.
Boxer is offline  
post #6 of 7 Old 06-26-2010, 03:05 AM
Owner
 
mk e's Avatar
 
Join Date: Jun 2010
Location: PA, USA
Ferrari Life Posts: 4,439
Quote:
Originally Posted by Boxer View Post
Many thanks for the insights.

Application would be for mostly street use and a bit of track time. Idea is to add bhp cost effectively without adding much weight.
What car are we talking about and how much hp are you trying to add? Custom systems can be quite expensive...like $10k - $30k depending what you do, but if there is an off the shelf option they usually start around $5k.
mk e is offline  
post #7 of 7 Old 06-27-2010, 05:10 AM Thread Starter
Administrator
Owner
Elite Member
 
Boxer's Avatar
 
Join Date: Apr 2004
Location: UK & Texas
Ferrari Life Posts: 15,131
Quote:
Originally Posted by mk e View Post
What car are we talking about and how much hp are you trying to add? Custom systems can be quite expensive...like $10k - $30k depending what you do, but if there is an off the shelf option they usually start around $5k.
Mosler MT900S

Should be able to use a fairly standard option given that the engine is a stock LS6.
Boxer is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
Copyright 2012 ONE Media, Inc.
FerrariLife is independently run with no affiliation with Ferrari SpA
Ferrari for Sale | Maserati for Sale