VTCS & VICS questions

[gangstagangsta]

I have a oem intake manifold that I removed the VTCS from, I read a how to and it stated the VICS was a good feature to keep so I only hogged out the lips on the runners behind the VTCS. My question is I cam across this thread http://www.mazdas247.com/forum/showthread.php?t=123744696&highlight=vcts
and was wondering if I should port the VICS like this http://www.mazdaspeedtuning.com/manifold.jpg
or leave it in and just do the PNP of the runners and emove the VTCS only?
(deadhorse) I know but I also know how awesome this forum is. Thanks for the help!!!

 

[blkspdfreak]

i keep hearing that that was a waste of time, i also wanted to do it but decided not to....

 

[Wagonbacker9]

removing VICS will do nothing buy hurt your torque curve. VTCS on the other hand is worth dumping.

 

[gangstagangsta]

removing VICS will do nothing buy hurt your torque curve. VTCS on the other hand is worth dumping.

so keep the VICS butterflys in or take them out and dont port the empty air chamber?
Thanks wagon you have been very helpful these past few weeks(burnout)

 

[Wagonbacker9]

leave the VICS butterflies in unless you see unusual wear on them. (there is a recall regarding this, mostly for P5's if I recall correctly. resolved long before the MSP.)

 

[CrazyCaker]

(there is a recall regarding this, mostly for P5's if I recall correctly. resolved long before the MSP.)

No the recall effected both sedans and P5s within a certain VIN range. The MSPs where not in the VIN range as far as I know. From what I noticed, it actually effected more sedans than P5s.

 

[Velocifero]

leave the VICS butterflies in unless you see unusual wear on them. (there is a recall regarding this, mostly for P5's if I recall correctly. resolved long before the MSP.)

No the recall effected both sedans and P5s within a certain VIN range. The MSPs where not in the VIN range as far as I know. From what I noticed, it actually effected more sedans than P5s.

Yeah, it was a vin range and the problem was screws weren't thread locked and would eventually work loose and end up in your combustion chamber. Fun times.

 

[Wagonbacker9]

No the recall effected both sedans and P5s within a certain VIN range. The MSPs where not in the VIN range as far as I know. From what I noticed, it actually effected more sedans than P5s.

good to know. I think I had that impression because it was early in the production run, and the sedans had 3 different engines... and the P5 didn't exist for the first 2 years... apparently my impression was incorrect.

 

[BOOSTR]

If you have a MazdaSpeed Proteg, it does not apply to the recall at all because the intake manifold shutter design is different and is more robust. (from protegefaq.net)

I still have mine and have no complaints with how the car pulls throughout the powerband.

 

[CrazyCaker]

It was 03's that were effected. I actually owned an LX as well at the time that was effected, but I ended up trading it in for a Mazda5 instead of getting the recall done lol.

 

[CrazyCaker]

If you have a MazdaSpeed Proteg, it does not apply to the recall at all because the intake manifold shutter design is different and is more robust. (from protegefaq.net)

You are correct. I actually forgot about that fact.

 

[dirtysouth_msp]

Been running a 626 manifold with no butterflys for a few years now with no problems.

Edit: This manifold is on my built MSP, which of course originally had the manifold with VICS & VTCS.

 

[Wagonbacker9]

626 is a single runner intake, so vics would be a complete non-issue. that is exactly why people use it.

 

[gangstagangsta]

Been running a 626 manifold with no butterflys for a few years now with no problems.

(cool)

I was more wondering about the difference in performance between leaving in the VCIS vs removing the VICS and porting the empty chamber.

alittle backround: I will be installing the SLS j/midpipe and SS AFC with this intake mani. Is it worth porting the VICS if I can tune for more air?

 

[Wagonbacker9]

there have been some reported issues with SSAFCs and unichips getting along with 626 mani's, but for all I know (the only one I have seen in person this was likely the case) it could be user or installation error.

once again, theres NO point in porting VICS... the 626 mani is a single runner mani, no secondary port = no butterfly in the port.

 

[dirtysouth_msp]

Yup, I know. Somewhat relevant though. Gotta keep those solenoids in place though or it will throw a cel. I will say that without VICS and VTCS, the car is gonna act much differently though, especially when cold.

 

[gangstagangsta]

there have been some reported issues with SSAFCs and unichips getting along with 626 mani's, but for all I know (the only one I have seen in person this was likely the case) it could be user or installation error.

once again, theres NO point in porting VICS... the 626 mani is a single runner mani, no secondary port = no butterfly in the port.

thx again wagon, i owe you a beer or to if you ever come to cali(smoke)(drunk)

 

[Wagonbacker9]

Yup, I know. Somewhat relevant though. Gotta keep those solenoids in place though or it will throw a cel. I will say that without VICS and VTCS, the car is gonna act much differently though, especially when cold.

relivant yes, but the way you stated it was confusing. a 626 intake with VICS would be something to see. lol

 

[BOOSTR]

For high boost applications, it is recommended that a large single (stage) isolated runner intake manifold be used.
(also from the protegefaq.net)

 

[Wagonbacker9]

if you're going for one big peak in your power curve... absolutely. thats literally what a single runner does.

a dual runner flattens out the curve and makes it wider... if you want a better dyno number, single runner, hands down, if you want a more drivable car, dual runner all the way.