VTCS manifold unpleasantness
#141
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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#142
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.
#143
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.
#145
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; 04-05-2016 at 09:50 AM.