calculating compression ratio under boost.
#1
Member
Thread Starter
Join Date: Dec 2000
Location: official euro R hospital, AUSTRIA
Posts: 4,567
Likes: 0
Received 0 Likes
on
0 Posts
calculating compression ratio under boost.
http://www.howstuffworks.com/framed....rbo.html#turbo
on this page is a formula where you can calculate the compression ratio under boost.
When I take this formula with my datas I have a cr of 5.5psi/14.7psi + 1 x 11 = 15.1:1 compression ratio under full boost. It is not too much.
A Audi S3 has a cr of 9.5:1 and about 12psi boost. (12/14.7 + 1 x 9.5) = 17.3:1 cr!!! WTF
I know a Nissan 200 which makes 300hp to the crank (in US I think it is the 180) with 10:1 cr and 1.1BAR boost (16.17psi)
HE has a cr of 21:1 under full boost EXTREM.
NOTE: 1 BAR = 14.7psi.
All I think I can safely boost 8psi (that would be 17:1 cr) without detonation or hurting daily driveability. CORRECT?!?!
Give me your statements please!
on this page is a formula where you can calculate the compression ratio under boost.
When I take this formula with my datas I have a cr of 5.5psi/14.7psi + 1 x 11 = 15.1:1 compression ratio under full boost. It is not too much.
A Audi S3 has a cr of 9.5:1 and about 12psi boost. (12/14.7 + 1 x 9.5) = 17.3:1 cr!!! WTF
I know a Nissan 200 which makes 300hp to the crank (in US I think it is the 180) with 10:1 cr and 1.1BAR boost (16.17psi)
HE has a cr of 21:1 under full boost EXTREM.
NOTE: 1 BAR = 14.7psi.
All I think I can safely boost 8psi (that would be 17:1 cr) without detonation or hurting daily driveability. CORRECT?!?!
Give me your statements please!
#2
New User
Join Date: Nov 2000
Location: Tampa, FL, USA
Posts: 3,467
Likes: 0
Received 0 Likes
on
0 Posts
Re: calculating compression ratio under boost. (austrian ITR)
All I think I can safely boost 8psi (that would be 17:1 cr) without detonation or hurting daily driveability. CORRECT?!?!
Give me your statements please!
Give me your statements please!
But, the problem is that roots type blowers such as yours lose their effeciency fast when you raise the boost. Without an intercooler, the charge temp gets too hot, detonation occurs, and your motor goes in the toilet.
#3
Member
Thread Starter
Join Date: Dec 2000
Location: official euro R hospital, AUSTRIA
Posts: 4,567
Likes: 0
Received 0 Likes
on
0 Posts
Re: calculating compression ratio under boost. (VaporTrail)
Yes, but I´m thinking about to get the JR water-injection to cool down the air.
Thread
Thread Starter
Forum
Replies
Last Post
rsx13k
Acura RSX DC5 & Honda Civic EP3
2
05-25-2007 12:38 PM
civicqm
Forced Induction
58
05-30-2003 08:39 AM