msp intake mani vcts n vics???

[steven giampino]

if i port and polish my stock msp intake mani wud it interfere with the VCTS or VICS??? or shud i just remove the vcts n vics???i no everybodys trying to get the 626 manis but egrs and and fuel rails arent meeting up properly.....i might as well just work with what i have knowing itll fit, but just a little concern the vcts n vics will not work right and a lack of power from low or top end occurrs and works against me???anybody have any thoughts or done this b4?????

 

[JDM Sam]

go ahead and delete them.

 

[blynd_spy]

+1 on deleting
after the port and polish I wouldnt think the vtcs butterflys would fit correctly anyway

 

[orng1]

So you say get rid of both of them Sam? I still have the stock intake but I wanted that 505 manifold if I get a chance to get it. Neox has a spot that he may not need...

 

[JDM Sam]

Yes, both. I don't bother with a 626 manifold when I do something like this.
This is what i do with them.
http://www.mazdaspeedtuning.com/manifold.jpg
http://www.mazdaspeedtuning.com/manifold2.jpg

 

[StealthWyvern]

How does the car react vs having both of them installed? Pros, cons of this setup?

 

[JDM Sam]

more air flow, leaner afrs, more midrange to peak power pull. i'll have a dyno graph shortly once i retune the guys car.

Pros - everything fits properly, you retain vacuum ports, no CEL, sleeper modification, frees up a vacuum port for running an independent source to the bov and wga.

Cons - sleeper modification, labor to hog it all out takes a while.

 

[StealthWyvern]

more air flow, leaner afrs, more midrange to peak power pull. i'll have a dyno graph shortly once i retune the guys car.

Pros - everything fits properly, you retain vacuum ports, no CEL, sleeper modification
Cons - sleeper modification, labor to hog it all out takes a while.

no cold running issues?

 

[Velocifero]

I was under the impression that deleting the VICS was nul in void. I have no ground to back it just remember way back when the 626 manis first started showing up others were highly against removing the VICS. I've done several port jobs to remove the VTCS on the stockers but none on the VICS. I always wondered though. Any input on the gain there Sam. I see you have been doing what I had wanted to try a long time ago but couldn't find any backing for that.

 

[JDM Sam]

No cold start up issues. Also, another pro is it frees up a vacuum port for running an independent source to the bov and wga.

You are increasing the volume of the manifold by hogging out the entire VICS chamber. Deleting the VICS flaps alone doesn't do anything b/c it is just an empty chamber with no air flowing into it. It's just a stagnant air chamber. Instead of a chamber of air opening at 5200 RPM, hogging out the manifold you have a large volume of air all the time.

The VTCS is a emissions system to increase turbulence to improve start up emissions. Other cars have similar systems. VTCS is more of a restriction compared to the VICS.

 

[TWISFM]

^^^^ thank you very much for the info..

 

[JDM Sam]

There was a Miata in Dsport that had a similar modification done on the BP 1.8 and it gained around 25-30 hp from doing this modification, the builder dyno verified it. Car made about 500 hp to the wheels. I spoke to the builder of that Miata and he says its a worthwhile modification alternative to a sheet metal manifold. We were gonna offer the service for modification, but it was too labor intensive even on a lathe to offer it to the public. The cast aluminum is difficult to grind down. The amount of the labor would have been around $450 to complete the modification.

 

[2k3 PrO RiDa]

Can this be done to a non turbo engine or does it only work with FI?

 

[JDM Sam]

It'll work on NA cars, but I have only put it on turbo proteges. The gains from doing this will be more beneficial to turbo cars. I would get a spare manifold somewhere and try this so you can compare the 2.

 

[2k3 PrO RiDa]

I have the top half of the mani next to me and it looks identical to the pics. Looks like this should give even more gains than just porting the top part but im worried about too much air coming into the system with NA.

 

[steven giampino]

Yes, both. I don't bother with a 626 manifold when I do something like this.
This is what i do with them.
http://www.mazdaspeedtuning.com/manifold.jpg
http://www.mazdaspeedtuning.com/manifold2.jpg

thanx sam....am i going to need any supporting mods for this such as an afc or tuning since it makes the fuel run more leaner?? my msp is all stock...

 

[JDM Sam]

you should be ok. the afr will still be rich just not as pig rich as it was. a tune to get the afrs perfect will extract more power.

 

[steven giampino]

ur the best thanks for the info