single to4s take forever to get to boost ??
10-20-08, 09:21 AM
#16
Driver
Join Date: Dec 2007
Location: Pa
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You have to realize something here, even by changing the housings it doesn't make it really spool faster... It's an illusion.. yes you get in to boost faster, but the turbo threshold is still the same... Meaning if you where to mat the gas at 4000 and have instant boost it will still be the same with virutally any housing.
The smaller housings get you into boost faster but if you have 18-20 psi boost settings then you'll be hard pressed to get more then 10 PSI with a .58 @ 3000 RPM vs 3-7 PSI on a 1.15 ex housing. The real diffrence is the .58 ramps up faster... The 1.15 will prob say about about 7-10 psi until about 4000 where it hits like a ton of bricks... the .58 will be more smooth and ramp up gaining boost right up until 4000 RPM where it hits max boost.
I ran a .84, .58 and .70.... the only probelm with smaller housings is that you may get surging.
The smaller housings get you into boost faster but if you have 18-20 psi boost settings then you'll be hard pressed to get more then 10 PSI with a .58 @ 3000 RPM vs 3-7 PSI on a 1.15 ex housing. The real diffrence is the .58 ramps up faster... The 1.15 will prob say about about 7-10 psi until about 4000 where it hits like a ton of bricks... the .58 will be more smooth and ramp up gaining boost right up until 4000 RPM where it hits max boost.
I ran a .84, .58 and .70.... the only probelm with smaller housings is that you may get surging.
Uhhhh, what? Keep it simple man. Comparing only the exhaust housing here, a smaller will spool faster and sacrifice flow at high rpms. The exact opposite occurs as you go with a larger A/R. Boost pressure is all relative as long as the compressor wheel hasn't changed......10psi on a .58 is also 10 psi on a 1.25 housing.
10-20-08, 09:11 PM
#17
Instructor
Yes I understand, but don't get his hopes up thinking that he'll get 20 PSI by 3000 RPM because it won't happen.
The threshold of the Ptrim wheel doesn't change and he will still hit the boost threshold at 4000 RPM.
The threshold of the Ptrim wheel doesn't change and he will still hit the boost threshold at 4000 RPM.
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