Why is boost so low??
01-18-2002, 03:55 PM
#1
Teching In
Thread Starter
Join Date: Jan 2002
Location: Tyler, TX
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Why is boost so low?? I have noticed that the general consensus is that it is unsafe to run more than about 9 psi of boost unless you are running high octane gas. And even if you run high octane, you need a highly built motor. But if you look at cars such as a stock 3000gt VR4 they come factory running 12 psi boost. How can they run such high boost safely when we can't???
01-18-2002, 04:43 PM
#3
Re: Why is boost so low?? [quote]Originally posted by Maurer:
<strong>They come stock with forged internals and lower compression....</strong><hr></blockquote>
in a nut shell, yes
Factory built forced induction cars are made for boost. The rotating/reciprocating assemblies are built for OEM durability numbers (read 80K+ miles). The static compression ratios are in the range of 8:1/8.5:1
13 psi on an 8.5:1 motor w/ small displacement is not uncommon.
compressors are different, setups are different.
it's a common question, but it's an apples to oranges comparison.
10+ psi on a factory built NA motor w/ 10:1 static compression is asking alot. Especially for pump gas <img src="gr_stretch.gif" border="0">
The age old question lives on "How much boost you running???" <img src="images/icons/rolleyes.gif" border="0">
unless you know the setup exactly, the number is unimportant <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />
FWIW, i have a stock motor <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
<strong>They come stock with forged internals and lower compression....</strong><hr></blockquote>
in a nut shell, yes
Factory built forced induction cars are made for boost. The rotating/reciprocating assemblies are built for OEM durability numbers (read 80K+ miles). The static compression ratios are in the range of 8:1/8.5:1
13 psi on an 8.5:1 motor w/ small displacement is not uncommon.
compressors are different, setups are different.
it's a common question, but it's an apples to oranges comparison.
10+ psi on a factory built NA motor w/ 10:1 static compression is asking alot. Especially for pump gas <img src="gr_stretch.gif" border="0">
The age old question lives on "How much boost you running???" <img src="images/icons/rolleyes.gif" border="0">
unless you know the setup exactly, the number is unimportant <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />
FWIW, i have a stock motor <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
