Upper VICS Mod for turbo cars.
maybe closer to 6K where the torque starts dropping off again.
02-10-2013, 12:38 PM
#27
I also did this. The short runners lift the power line up starting from about 6.5k. In other words you gotta make them an inch longer to lower the benefit down to about 5.5k. If you're revving up to 9k then this mod is great however for our stock redline its a bad mod because it ends up being useless and you get rid of the VICs. You end up with a rather nasty dip from 5k to about 6.5k
After experimenting with this what i think is a good idea is to cut the top of the runners here. Will post pic in a sec.
Here you go, cut the red part so you shorten the intake and lift up the power band. Dont touch the green part though since you want to keep the VICs in tact unless you plan on increasing the redline another 2k.
I gotta lower my boost to the stock level so i can do few tests (clutch slipping at current level)
After experimenting with this what i think is a good idea is to cut the top of the runners here. Will post pic in a sec.
Here you go, cut the red part so you shorten the intake and lift up the power band. Dont touch the green part though since you want to keep the VICs in tact unless you plan on increasing the redline another 2k.
I gotta lower my boost to the stock level so i can do few tests (clutch slipping at current level)
Last edited by triple88a; 02-10-2013 at 12:50 PM.
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02-10-2013, 01:13 PM
#29
Honestly no clue where to do a virtual dyno run any more. The only place here is getting too crowded while the shop next door (sound performance) wants 200 bucks per hour. Not something i can afford at the moment.
I did do 2 virtual dyno runs when i first gutted the manifold. I did 2 runs one with closed one with opened. The closed run maxed out at about 5k rpm then started going down till redline, the open run was horrible until about 6.5k rpm then spiked and hit the redline at 7k.
I did post the virtual dyno results here on the forum on one of the gutted manifold threads back when i gutted it.
I did do 2 virtual dyno runs when i first gutted the manifold. I did 2 runs one with closed one with opened. The closed run maxed out at about 5k rpm then started going down till redline, the open run was horrible until about 6.5k rpm then spiked and hit the redline at 7k.
I did post the virtual dyno results here on the forum on one of the gutted manifold threads back when i gutted it.
Last edited by triple88a; 02-10-2013 at 01:27 PM.
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02-10-2013, 02:49 PM
#30
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I can't see why the fundamental characteristics of airflow in the manifold would be significantly different whether the absolute pressure inside the manifold is 100 kPa or 200 kPa. One could argue that the density of the air will be slightly higher, but in either case the way in which the air behaves as it moves through the system should be essentially the same.
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02-10-2013, 02:56 PM
#31
I can't see why the fundamental characteristics of airflow in the manifold would be significantly different whether the absolute pressure inside the manifold is 100 kPa or 200 kPa. One could argue that the density of the air will be slightly higher, but in either case the way in which the air behaves as it moves through the system should be essentially the same.
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03-15-2014, 11:58 AM
#37
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03-15-2014, 12:00 PM
#39
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I can't see why the fundamental characteristics of airflow in the manifold would be significantly different whether the absolute pressure inside the manifold is 100 kPa or 200 kPa. One could argue that the density of the air will be .. higher, but in either case the way in which the air behaves as it moves through the system should be essentially the same.
Speed of sound temperature air formula without no barometric pressure calculator table air density of air calculation mach 1 acoustic impedance propagation air density sea level velocity ideal gas 20 degrees or 21 degrees Celsius C cold warm - sengpi
This is supported by observations that the VICS effect in % terms is the same for NA cars and the above 6 psi car.
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