Tied Up Vris

I have my VRIS tied open but only because I don't have MS set up to control the solenoids yet. Without the VRIS operating at all (always closed) it really had no top end power. I noticed a pretty big loss of low end after I tied them opened but it works this way for now.

The best thing to do is leave the VRIS working normally, even with a turbo. You will notice a lot smoother hp and torque curve.

hm... ive had mine tied open for ever now. i always that it was better that way boosted?.
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I had mine tied open, and It seems to feel better with them working normally.


Because the car i a normal car as long as you dont hit boost.


I heard its bad tho as it can give a set of pistons a bit more psi than the rest. I dunno..


Leaving it on for now until i get msns.

VRIS are huge restriction and were designed for an NA motor. keeping them open will net a faster spool up and more power, it was proven way way back in the day.

But, they can be used to advantage, but your charting in an area that nobody has gone. And its generally not ideal for optimum power.

Gut the IM or a ZE im is the best route

Well the IM it's self isnt good for top end power in either N/A or turbo cars but I would think that the VRIS system would work well enough with a turbo and since theres no asymetrical flow path theres no chance that one cylinder will go lean over any other.


I would try a different IM than the stock DE and see if it helps at all.

The 93-97 DE IM is the only one that places the VRIS butterflys directly in the way of air flow.

With the ZE, curved neck, and G4 IM's the drivers side VRIS is placed between the plenums so open or closed theres nothing obstructing floe between the throttle body and ports.

The best thing would be a custom manifold but building one with decent characteristics is hard mostly due to hood clearance.

as soon as you hit boost at all your vales will close, as they require vac/neg pressure to work .. this cant be good, havving 1/2 the intake blocked... I gutted my ZE one...

Mr. MX6 said:

as soon as you hit boost at all your vales will close, as they require vac/neg pressure to work .. this cant be good, havving 1/2 the intake blocked... I gutted my ZE one...

Click to expand...

This time around I plan to gut the VRIS on my ze manifold as well. Just a matter of taking off the VRIS crap and then doing what exactly?

Basically you take out the vris stuff and weld/cover the holes that are left from the solenoids.

yea just a simple bolt will do.. i shaved the head off one to make it block airflow less and used some sealant. sweeet as ..