20V BT VVT with aftermarket cams

[86JAP]

Car - 86

motor - Black Top 20 Valve

use - daily bit of drift

problem - not so much a problem i would like to know what is involved in removing the vvt set up to run A/M cam gears? I know with the Toda gears u can keep it but just researching all the options.

Thanks in advance guys.

Sam.
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[Sam-Q]

unplug VVT solenoid, put gear on, sell VVT gear

what ECU are you running?

[Jonny Rochester]

You can simply unplug the solenoid. I have removed the solenoid myself, and I make up a little alloy bung to replace it. I can make one for you too if you like. Im just about to make a handfull of them.

[86JAP]

thank guys, its actually a mates car im referring to but always wondered myself and will need to know when i build my next 86.. anyway at the moment its running 292 degree toda cams with vvt still in operation and running a Haltech E8.

[Sam-Q]

with what lift cams?

[86JAP]

cams have 8.1mm lift

[Sam-Q]

yeah just as I figured, it's hard to get information on this subjuct but it seems that using higher than stock lift means you can't have more than 270 degrees duration, but I the limit for longer duration is probably around 8.5mm

[86JAP]

Thanks Johnny and Sam dunno what my mate is gonna do but ive pretty much decided on removing it, simply because the next motor i build will have fairly high compression and i dont want VVT to kick in at the wrong time and bend some valves lol..

[Sam-Q]

what spec cams and what C/R are you thinking of going for?

[4000GT]

This thread is all wrong... you can get high lift high duration cams on the BT 20v, I have 288 with 10.0mm lift and 12.5:1 comp. Not running the VVTi will totally destroy the mid range power, we tested this on the dyno and dropped 20WHP through much of the rev range on a stock motor. I dont understand the comment about hitting valves with VVTi "kicking in" at the wrong time and bending valves, we played around with VVTi engagement points from 1,200rpm and up and guess what, the factory has it in the optimal position, much like the intake setup... if you do run adjustable cam gears, expect to spend hours on the dyno dialing them both in for where ever you want to make peak power.