S4?
03-11-03, 03:12 AM
#3
Rotary Enthusiast
Different.
The S4 has a smaller exhaust housing, .85 I think. While the S5 is 1.1.
The S5 has a twin scroll exhaust housing setup, which keeps the exhaust gasses seperate until they hit the turbine, so there is less turbulence which should aid spool up.
Obviously they use a different flange because of that. The S5 has a more rounded hot side (bigger A/R) while the S4 is flatter.
There's prolly more, but I can't think of anything at the mo.
No, wait... Another thing and quite useful too. The S5 has dual wastegate flaps that allow better boost control.
The S4 has a smaller exhaust housing, .85 I think. While the S5 is 1.1.
The S5 has a twin scroll exhaust housing setup, which keeps the exhaust gasses seperate until they hit the turbine, so there is less turbulence which should aid spool up.
Obviously they use a different flange because of that. The S5 has a more rounded hot side (bigger A/R) while the S4 is flatter.
There's prolly more, but I can't think of anything at the mo.
No, wait... Another thing and quite useful too. The S5 has dual wastegate flaps that allow better boost control.
03-11-03, 06:27 AM
#4
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Originally posted by S2-13BT
Different.
The S4 has a smaller exhaust housing, .85 I think. While the S5 is 1.1.
The S5 has a twin scroll exhaust housing setup, which keeps the exhaust gasses seperate until they hit the turbine, so there is less turbulence which should aid spool up.
Obviously they use a different flange because of that. The S5 has a more rounded hot side (bigger A/R) while the S4 is flatter.
There's prolly more, but I can't think of anything at the mo.
No, wait... Another thing and quite useful too. The S5 has dual wastegate flaps that allow better boost control.
Different.
The S4 has a smaller exhaust housing, .85 I think. While the S5 is 1.1.
The S5 has a twin scroll exhaust housing setup, which keeps the exhaust gasses seperate until they hit the turbine, so there is less turbulence which should aid spool up.
Obviously they use a different flange because of that. The S5 has a more rounded hot side (bigger A/R) while the S4 is flatter.
There's prolly more, but I can't think of anything at the mo.
No, wait... Another thing and quite useful too. The S5 has dual wastegate flaps that allow better boost control.
S5 does not..
03-12-03, 02:03 AM
#6
twin scroll exhaust housing is ment that it's a divided exhaust housing, but that isn't only on S5, my S4 has a divided housing also, just that manifold doesn't have a true divide version, but instead twin scroll.
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03-15-03, 10:38 AM
#8
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Im thinking of posting a thread on this but i dont want to be flamed...SO if someone where to intalle a S5 turbo on a S4 Tii would there have to be any mods done to anything? Im saying can someone install a s5 turbo on a s4 easily? Im thinking of performing this mod