DIYPNP + VVT + R8 Coils
#1
DIYPNP + VVT + R8 Coils
How I got VVT control and R8 Coils running using DIYPNP
VVT Control:
I used ALED (can use WLED too) output to enable 12v+ to the VVT solenoid and set a trigger like that:
Actual rpm trigger was 2000rpm.
Many dyno runs showed that the engine want the VVT enabled at very low rpm and disabled at around 5300rpm.
Works great and no real need for transitions area that are used in a "real" vvt control.
R8 Coils control (low impedance):
DIYPNP does not support low impedance coils - like the R8 for example.
In order for the DIYPNP to support them we need to add two TC4427 chips and 4 15ohm 1/8W resistors,
Use the PROTO area, use the GND next to it, feed the TC4427 with 12v+ and use IGN1 (and IGN2) as input on both inputs on each chip, the output legs are combined too and go to the correct pin on the adapter board (on 97 it's 1H and 1G)
Some pictures:
Check my blog for more details.
Elior
VVT Control:
I used ALED (can use WLED too) output to enable 12v+ to the VVT solenoid and set a trigger like that:
Actual rpm trigger was 2000rpm.
Many dyno runs showed that the engine want the VVT enabled at very low rpm and disabled at around 5300rpm.
Works great and no real need for transitions area that are used in a "real" vvt control.
R8 Coils control (low impedance):
DIYPNP does not support low impedance coils - like the R8 for example.
In order for the DIYPNP to support them we need to add two TC4427 chips and 4 15ohm 1/8W resistors,
Use the PROTO area, use the GND next to it, feed the TC4427 with 12v+ and use IGN1 (and IGN2) as input on both inputs on each chip, the output legs are combined too and go to the correct pin on the adapter board (on 97 it's 1H and 1G)
Some pictures:
Check my blog for more details.
Elior
#2
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,104
I think most people here would disagree with your assessment that VVT doesn't need "real control". My VVT maps bleed off advance across a ~2000rpm band. You are giving up power by controlling the VVT like that.
#7
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,104
There are plenty of dyno graphs showing full VVT control floating around here. I would rather have a 99-00 head with a BP5A cam than a switch-controlled VVT setup.