and sometimes aunt flow comes into town and you gotta ban a noob.

 

Bring the dead thread up, I know the benefits of the VICS on a stock car, but has anyone tested the power/torque with VICS on and with VICS off in boost? I use the VVT map feature on my ecu to control the VICS solenoid.

 

So that's a PWM output, which I've tried on the dyno. Unfortunately you're controlling a electrical solenoid, which responds to the PWM, but it's controlling a vacuum actuator, unlike the VVT oil control valve. So you'd want a large vacuum canister to hold vacuum in order for it to work. According to my dyno testing on a naturally aspirated, VVT equipped car, there would be a benefit, but it would be incredibly minor. After two dyno pulls back to back, we found two cross over points, the stock ~5250 point, and one at ~3500 IIRC, it's been a while. We tried "PWMing" the output, which started to show minimal benefits, but as I said ran out of vacuum. In the end, we set it back to a switched output, active above 3500 and below 5250, or whatever those two RPMs were.

On boost, I've found the VICs feature to still make small power differences, but 5hp on a 130hp engine is a much bigger deal than 5hp on a 300hp engine. I would do two dyno pulls, one with it set to 1000rpm, one at 10000rpm. Find where those two dyno's cross over, set your programmable switched output to that RPM, and forget it.

 

i was going to gun VICS but then thought about the low rpm benefits.
i'm going to follow the advice but electronically open and close, not using vacuum. we'll see how it works

even if 2 hp difference, it seems it is still worth it...

 

What do you even mean by controlling it electronically? The opening and closing times are already controlled electronically via solenoid and fully tunable with any standalone ECU.

Are you planning to run an electronic actuator?

 

If he is, that's kinda cool. crazy amount of effort for almost nothing, but cool

 

Possibly less than nothing. Isn't vics just providing additional plenum volume with the butterflies open? I don't think half open butterflies are going to effectively allow for half the volume increase. It may create some other strangeness in flow that could be beneficial though. I guess curlys findings are encouraging.

Do the thing and post the data please.

 

Once again reviving this thread. I’m about to swap a BP4W into my ‘90 Miata. I started to wonder if the VICS would be beneficial when running boost. From what I’ve read, very minimal.

 

When you tune the car on the dyno, do a before/after comparison. It's definitely useful and all it costs is a few ounces of weight to use the Mazda solenoid and a spare digital output on your megasquirt.

--Ian

 

I’m running a Beer Money Motorsports ECU and definitely plan to use it. The engine came from a running and driving car that a tree fell on. So I have everything I need down to the harness.