s4 manifold or s5 manifold on n/a s4?
06-05-04, 11:24 PM
#1
boost on the way(GTU II)
Thread Starter
s4 manifold or s5 manifold on n/a s4?
which gives better power numbers on a s4 n/a motor??
-s4 ported intake manifold
or
- s5 ported intake manifold
or
-stock s5 intake manifold
tell me what you think and throw in some input to back your theory. thanks alot
jack
-s4 ported intake manifold
or
- s5 ported intake manifold
or
-stock s5 intake manifold
tell me what you think and throw in some input to back your theory. thanks alot
jack
06-05-04, 11:38 PM
#2
Former Moderator. RIP Icemark.
On a otherwise stock or lightly ported S4 motor, the S4 LIM with S5 upper (VDI) intake will provide the best increase in HP.
But on a moderate ported or heavy ported the S4 upper and lower will provide the best power.
But on a moderate ported or heavy ported the S4 upper and lower will provide the best power.
06-06-04, 12:04 AM
#3
boost on the way(GTU II)
Thread Starter
why not the s5 lower..... i know there is another port for some function that the s4 does not have but im sure that is no big deal or is it?
06-06-04, 12:23 AM
#5
Former Moderator. RIP Icemark.
The entire S5 intake manifold has been dyno proven to provide less power than the stock S4 manifold on a S4 non turbo motor.
The advantage of the S4 LIM/S5 UIM combo is that the much larger S4 LIM runners allow better flow. In fact the S5 UIM/VDI section will need to be slightly ground/ported/port matched to the S4 LIM to get reasonable flow gains.
The advantage of the S4 LIM/S5 UIM combo is that the much larger S4 LIM runners allow better flow. In fact the S5 UIM/VDI section will need to be slightly ground/ported/port matched to the S4 LIM to get reasonable flow gains.
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06-06-04, 08:56 AM
#8
boost on the way(GTU II)
Thread Starter
im gonna have to take a look at the s4 lim and compare it to my s5 lim and compare them.... but the s5 intake manifold i have is gasket port matched.
06-06-04, 09:04 AM
#9
Former Moderator. RIP Icemark.
Originally posted by bingoboy
so um, any idea if that would work for an S5 motor? the S4 LIM/S5 UIM combo i mean. my knowledge of the S4 NA when there are differences is very lacking
.
so um, any idea if that would work for an S5 motor? the S4 LIM/S5 UIM combo i mean. my knowledge of the S4 NA when there are differences is very lacking
.
The S5 motor follows a simular set up, that if you have a stock motor (or a very mild street port) the stock S5 intake system, port matched and cleaned up internally will give you the best power.
But for moderate to heavy ported S5 motors, a port matched S4 intake system will produce better power.
These are all based on testing both real world and at a dynojet up here in Northern CA, but I think you will find most of the big or better engine builders will agree.
