beancooker

Has anyone tried to bypass the vacuum actuator on the VAIS to keep the VAIS open all the time. It can be done easily with a short piece of wire. Will this add to the HP?

9DTALON

iTrader: (1)

Are you talking VAIS or the SCV valve. The VAIS is the fully electric valve on the driver side. The SCV valve is the vacuum actuator on the pass side. The SCV is a Swirl Control Valve. The idea for the SCV as I understand is to swirl the incoming air from the intake runners before it enters the intake port area. This swirling effect is supposed to increase the effeciency of the air-fuel charge to the cylinder. At higher RPM's though it is open completely and is a minimal restriction. But you could always try it out to see how it reacts. I'd be interested to know.

beancooker

The VAIS (drivers side just in front of the throttle body) which opens up at 5k RPM. But if it was open at a lower RPM would I gain any power?

ChromeSE5

iTrader: (3)

yes you can but you will have a tq penalty below 5k rpm. According to those who have done it though, it is suppose to be a screamer above 5k rpm.

Kevlo911

iTrader: (36)

I would be better to take the rod out instead of keeping it "open" at all times.

NmexMAX

iTrader: (22)

Keeping it open all the time you lose tq below 5k, and gain nothing after 5k, taking the rod out you lose tq before 5k and gain a little bit above.

beancooker

How much TQ do you lose, a lot or not enough to notice???

MaxBoost925

iTrader: (33)

not too much torque. but you definitely can notice it.

the high end power is incredible.

Progress

iTrader: (26)

I say we all take our rods out.

MaxBoost925

iTrader: (33)

sloppymax

iTrader: (8)

my dynos showed around a 10-14lb torque loss across the board til 5k where the power band is moved to. i think i made around 15lbs of torque more at redline. the hp is only slightly higher than one with a properly working vias.

xlcrew

iTrader: (17)

yeah i showed 15lb loss across the board. i don't think it's worth the loss. it screamed up top, but not enough to off set the torque loss in my books. and it was dynoed on the same day when i took it out. my HP numbers were better, but that's because it wasn't working on my first two runs.

SuperStasiu

iTrader: (3)

So what about someone running cams or nitrous wouldnt they benefit from this. What about takeing out the rod and putting in bigger injectors?

NmexMAX

iTrader: (22)

That makes no sense.


That wouldn't do anything but make it run richer (N/A of coruse)

steven88

iTrader: (28)

i wish i had a full time VIAS

NmexMAX

iTrader: (22)

Then it would eliminate the "V" in VIAS...

xlcrew

iTrader: (17)

how does that not make sense. it lost torque but gained hp. the car ran hard all the to redline from 5000 but before that it was a dog. now if i could rev my car to 7200 then i think i would keep the valve out because the car would continue to make power. but it doesn't so i'll keep it in.

NmexMAX

iTrader: (22)

If it lost 15 ft/lbs across the board then it NEVER showed a gain in hp or tq.

Across the board, to me, means over all RPM points.

sloppymax

iTrader: (8)

while you do lose torque in certain rpms, remember since horsepower and torque have a relation, that the torque is higher where the hp is higher.

Deckdout2

iTrader: (151)

That sounds made up.

NmexMAX

iTrader: (22)

Some ancient greek physicist made it up and we believe him sloppy is his predecessor, just passing the word.

Progress

iTrader: (26)

True. Especially if horsepower is higher at 5,200 RPM.

NmexMAX

iTrader: (22)

I make more torque at 1200 than I do at 7000 but @ 7000 my HP is much higher than my tq

sloppymax

iTrader: (8)

thats because you got the JDM option.

beancooker

What JDM option?

SuperStasiu

iTrader: (3)

lol

VaporHead

You guys get to 7000k RPM? at the track? I don't think mine has never reached over the red line.

beancooker

Don't know how, my redline is 6500rpm. must be a TCM mod or electronic upgrade.

sloppymax

iTrader: (8)

you are just bitter cause you dont gotz da jdm.

VaporHead-the reason NmexMAX is reving that high is because the technosquare ecu.

steven88

iTrader: (28)

i can rev my car to 6900...and i have a stock ecu

NmexMAX

iTrader: (22)

You must have the JDM option too..

Both my A's are JDM y0!

sloppymax

iTrader: (8)

speedo error ftl. ive seen my tach goes as high as 6800 on stock ecu but both vafc and obd scan said a few hairs under 6600.

NmexMAX

iTrader: (22)

The A32 tach has always been faithful to me. I have a 7200 shot but its at work

steven88

iTrader: (28)

wow, SES on both of your cars FTL

NmexMAX

iTrader: (22)

I was wondering who the 1st to notcie that was going to be