VTCS manifold unpleasantness
Do you mean VICS (NB1) Bob? Very similar to the VTCS (NB2) but without the butterflies.
After playing with multiple VICS solenoid switching points, I found more torque below 5000 with a VICS than with a squaretop on our PTE engines. I don't recall the exact rpm switch points but it was something like close at idle, open around 2200, close at 6800 or something like that. Simple enough to tune on a dyno.
After playing with multiple VICS solenoid switching points, I found more torque below 5000 with a VICS than with a squaretop on our PTE engines. I don't recall the exact rpm switch points but it was something like close at idle, open around 2200, close at 6800 or something like that. Simple enough to tune on a dyno.
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I'd love to see a VICS comparison added to the chart.
I counseled someone on how to tune the VICS -- basically a dyno pull open and a dyno pull closed -- look for the crossover points. My switchover points ended up similar to OEM, but a friend of mine that did it ended up with a much lower switchover (in the 3K range IIRC). He got a super-flat and fat torque curve that fills me with jealousy. Neither of us saw the 2nd switchover point, but we may not have revved high enough.
I counseled someone on how to tune the VICS -- basically a dyno pull open and a dyno pull closed -- look for the crossover points. My switchover points ended up similar to OEM, but a friend of mine that did it ended up with a much lower switchover (in the 3K range IIRC). He got a super-flat and fat torque curve that fills me with jealousy. Neither of us saw the 2nd switchover point, but we may not have revved high enough.
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Joined: Jul 2005
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From: Anacortes, WA
Do you mean VICS (NB1) Bob? Very similar to the VTCS (NB2) but without the butterflies.
After playing with multiple VICS solenoid switching points, I found more torque below 5000 with a VICS than with a squaretop on our PTE engines. I don't recall the exact rpm switch points but it was something like close at idle, open around 2200, close at 6800 or something like that. Simple enough to tune on a dyno.
After playing with multiple VICS solenoid switching points, I found more torque below 5000 with a VICS than with a squaretop on our PTE engines. I don't recall the exact rpm switch points but it was something like close at idle, open around 2200, close at 6800 or something like that. Simple enough to tune on a dyno.
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Joined: Dec 2008
Posts: 315
Total Cats: 9
From: Ft. Lauderdale, FL
I'd argue this.
Morse: VTCS with butterflys removed, junk yard VVT, stock NB2 header, MSpro, exhaust shop special from header back, ~10" intake to headlight area.
Sauer: VICS, rebuilt VVT with shaved head, Ebay RB copy, Rev MS3, enthuza test pipe, RB mid pipe and muffler, K&N intake.
The junk yard motor sadly made more power, I really need to get back to the dyno with the Sauer engine and see if some VVT tuning will result in similar gains down low. But Morse has 4 extra hp/ftlbs from 4k to 6250, then by 7000rpm, Sauer suddenly has 9 extra hp and 6 more ft/lbs.
I've always attributed this to his VICS manifold, no?
Morse: VTCS with butterflys removed, junk yard VVT, stock NB2 header, MSpro, exhaust shop special from header back, ~10" intake to headlight area.
Sauer: VICS, rebuilt VVT with shaved head, Ebay RB copy, Rev MS3, enthuza test pipe, RB mid pipe and muffler, K&N intake.
The junk yard motor sadly made more power, I really need to get back to the dyno with the Sauer engine and see if some VVT tuning will result in similar gains down low. But Morse has 4 extra hp/ftlbs from 4k to 6250, then by 7000rpm, Sauer suddenly has 9 extra hp and 6 more ft/lbs.
I've always attributed this to his VICS manifold, no?
Last edited by MX5RACER; Apr 5, 2016 at 09:50 AM.
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Was that with the VICS switching modes at some RPM (e.g. 5600 RPM)?
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From: Ft. Lauderdale, FL
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Alas no progress on the manifold. I have John backed up with other stuff so the printer is sitting idle for a while. When Dan Howard starts in about two weeks (sales mgr), it should free me up to spend more time on R&D projects.
slacking = riding my bike
slacking = riding my bike
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From: Melissa, TX
Weather is cooling off, garage is becoming usable and I'm looking at gathering some parts to polish off the drivetrain. Intake manifold is one of them, but I'm guessing that this won't be available in the next 3-4 months.... right?
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Probably more like a year. It is an undefined, lower priority R&D project with no ETA. That said it is the primary reason we purchased our very large 3D printer so it will happen, I just do not know when.
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