Vast Intake Manifold

[p.tony]

Wanted to know if anyone is a testament to the performance factor of the ported and polished intake. Was thinking about doing it but wanted a first hand review. Thanks for your input

[sCeRaXn]

Id be interested in knowing as well. It will definitely work better than stock if it was done right, and im sure Vast would do it right. The only thing that concerns me is the fact that the stock manifold uses velocity stacks at the entrance of each port. This is great for flow, but changing the radius of velocity stacks can cause some loss of velocity which would change throttle response at lower engine speeds. It could also cause reverb inside the manifold at higher engine speeds, but i dont think you could take off enough material on the stocker to cause this...especially on the stock cams.

As i said, im sure Vast knows what theyre doing and wouldnt release a product that didnt improve power. Im still really interested in finding out how they perform.

[Boris]

how much does it cost $?

[S4 in_lowplaces]

treefiddy

[MiniRS4]

which VAST Intake Mani?

is it the OEM manifold w PnP? the gains are insignificant. there is not much you can do cept for remove the castings. this will help with flow characteristics... but almost not at all. if its the SPTurks mani, then different story.

that is all.

[generationjdm]

which VAST Intake Mani?

is it the OEM manifold w PnP? the gains are insignificant. there is not much you can do cept for remove the castings. this will help with flow characteristics... but almost not at all. if its the SPTurks mani, then different story.

that is all.

Actually theres a lot you can do to the stocker, if you look inside one you will see the bells r in horrible shape from the factory not to mention the throttle body opening is blocked about 10-15%...

[MiniRS4]

Actually theres a lot you can do to the stocker, if you look inside one you will see the bells r in horrible shape from the factory not to mention the throttle body opening is blocked about 10-15%...

like i said, you can remove the castings... even in around the bell. maybe open them up a lil. TB too... but what do you think that is going to yield?

i know itll do something. every lil bit helps. but alone, the PnP wont do much. not anything significant anyways. i say skip on the VAST Intake Mani.

on the other hand, if you want to see some gains/difference, SPTurks Mani FTW. PM me if you are interested. cheers, that is all.

[Boris]

what does the spurks manifold do different?

[revhards4]

I noticed the car to be much much smoother in acceleration...I also added the phenolic spacers so that helped also, I recommend it. The only serious benefit on the butt dyno would be the rs4 or 2.8 heads with cams and a bigger plenum like the sp turks version. But for a couple hundred bucks I can't complain

[MiniRS4]

I noticed the car to be much much smoother in acceleration...I also added the phenolic spacers so that helped also, I recommend it. The only serious benefit on the butt dyno would be the rs4 or 2.8 heads with cams and a bigger plenum like the sp turks version. But for a couple hundred bucks I can't complain

bet it wasnt the intake mani, rather the Phenolics! phenolics FTW!

[DxC]

like i said, you can remove the castings... even in around the bell. maybe open them up a lil. TB too... but what do you think that is going to yield?

i know itll do something. every lil bit helps. but alone, the PnP wont do much. not anything significant anyways. i say skip on the VAST Intake Mani.

on the other hand, if you want to see some gains/difference, SPTurks Mani FTW. PM me if you are interested. cheers, that is all.

ok if your gonna pimp the spturks mani, you gotta give us more info. ive seen the pics ... and i applaud the effort. what kind of gains are seen? any logs? what other mods are/should be done?

the thing is, these cars are boosted, so what does the extra plenum space really do? what kind of design considerations were put into it? just a 'make it bigger' approach?

im very curious about all the intake mod stuff and wish we could do more scientific testing to see the effects of rs4 cams, bigger intake manifolds, bigger bipipes, bigger inlet pipes to turbos ... data data data

[p.tony]

I posted the same question in tha A6 section of the forum. Daft the moderator gave a pretty good answer to the question posed. Check it out

[generationjdm]

ok if your gonna pimp the spturks mani, you gotta give us more info. ive seen the pics ... and i applaud the effort. what kind of gains are seen? any logs? what other mods are/should be done?

the thing is, these cars are boosted, so what does the extra plenum space really do? what kind of design considerations were put into it? just a 'make it bigger' approach?

im very curious about all the intake mod stuff and wish we could do more scientific testing to see the effects of rs4 cams, bigger intake manifolds, bigger bipipes, bigger inlet pipes to turbos ... data data data

If theres any gains I would guess they will be seen well into the 7k rpm range...

[revhards4]

Just like on the Honda B-series engines...the edelbrock intake manifolds made 30 extra wheel horsepower and held the torque better through out the entire rpm range...I can only assume that with a bigger plenum on the s4 would act in the same fashion.

[Daft]

If theres any gains I would guess they will be seen well into the 7k rpm range...

I agree with this but, this is where you'd want to have a larger turbo on your car. As we all know, the K03's demise begins at 5Krpms.....

My opinion is to keep the stock intake manifold if you have K03s. If you have more top end airflow then, you can take advantage of the intake manifold & throttle body mods.

[nizmosx]

Just like on the Honda B-series engines...the edelbrock intake manifolds made 30 extra wheel horsepower and held the torque better through out the entire rpm range...I can only assume that with a bigger plenum on the s4 would act in the same fashion.

However if the s4 manifold was built much better than the stock honda b series then the gains would yeild different results. Its kind of like saying, well the honda picked up 4whp with an open element filter but the audi lost 1whp with an open element filter. Maybe the factory airbox on the honda was a bad design compared to the factory audi airbox. Its all here-say.

[DxC]

Just like on the Honda B-series engines...the edelbrock intake manifolds made 30 extra wheel horsepower and held the torque better through out the entire rpm range...I can only assume that with a bigger plenum on the s4 would act in the same fashion.

the honda was NA right? the s4 is turbo ... air in the intake manifold is already pressurized ... so its pretty much getting shoved into the combustion chamber already ...

[MiniRS4]

ok if your gonna pimp the spturks mani, you gotta give us more info. ive seen the pics ... and i applaud the effort. what kind of gains are seen? any logs? what other mods are/should be done?

the thing is, these cars are boosted, so what does the extra plenum space really do? what kind of design considerations were put into it? just a 'make it bigger' approach?

im very curious about all the intake mod stuff and wish we could do more scientific testing to see the effects of rs4 cams, bigger intake manifolds, bigger bipipes, bigger inlet pipes to turbos ... data data data

D,

looks like you need to flip one and get on your computer and do a lil HW, lol. extra plenum- what does it do? are you serious? you obviously know what the intake mani does. what do you think will happen when you increase the volume of the plenum then? it will obviously allow for more air. (look up enlarged intake mani/plenums for other turbo cars!)

i cannot go into specifics regarding the design etc, but i can assure you that there was plenty of RnD that went into the design- few revisions. after all, you dont want it to be too big, then it will work against you.

as for logs, data, etc... im not a data/logger whore, so i dont have anything for you, but i know that others have logged, and they have seen a dramatic difference in air flow. Kurt@VAST has been logging it and cannot believe the results. i also had a special version w a larger throttle body on my KO4s and you can definitely feel the difference.

to sum up what it will do for you... on a KO4 car, after you boost, it hits hard, but then slowly tapers off. you can feel the car dying off to the redline. w the SPTurks mani you dont feel the car being choked off. rather, the tach still keeps flying. in fact if you dont pay attention, the ****** will just bounce off the limiter.

here is a vid of the SPTurks Manifold in action. granted Greg's and my car werent running quite right, but look at how out he is... whew!

SPTURKS MANIFOLD VIDEO - (3) SSP Tuned STAGE III RACE

i hope i have answered your questions. the last few things ill mention is that you'll need phenolic spacers for this mod (which i have for sale), and also that the Black Beast (SPTurks car) is for sale. PM me for both, and until next time, cheers...

that is all.

[MiniRS4]

If theres any gains I would guess they will be seen well into the 7k rpm range...

the SPT Mani provides additional air all the way through the rev band. the gains are seen well before 7k, lol. at 7k its already game over- no more to rev... what are you talking about?

anyhow... if you meant that the gains might be felt more in the high-end of the rev then you are more or less right. more air and not being choked off ='s extra powa. that is all.

[hachirokukid]

anyone got pics of this SPTurks Mani? i never seen one...

[generationjdm]

the SPT Mani provides additional air all the way through the rev band. the gains are seen well before 7k, lol. at 7k its already game over- no more to rev... what are you talking about?

anyhow... if you meant that the gains might be felt more in the high-end of the rev then you are more or less right. more air and not being choked off ='s extra powa. that is all.

Lets see the logs over the stock mani and the rs4 mani? Whats on Gregs GT car? "My guess would be that the larger plenum would benefit more upstairs as they always do" is what i said

[DxC]

hey minirs4, ur right, ill look up the role a larger plenum plays in other turbo cars. im sure theres much more info for some turbo nissans/supras so ill read up. i was just thinking that since the air in the intake mani is pressurized, there would already be more than enough air for the combustion chamber.

im skeptical for now just because there isnt much information on anything, but i really do hope that an enlarged plenum (maybe combined with 2.8 heads and rs4 cams) has a significant increase in power :)

"i cannot go into specifics regarding the design etc, but i can assure you that there was plenty of RnD that went into the design- few revisions. after all, you dont want it to be too big, then it will work against you."

can you just comment on why it will work against you if it is too big?

also do you think that if you enlarge the plenum, the throttle body size and bipipe size is not as relevant? since there is an enlarged space to "store" air ... its not as necessary to get the large diameter flow going.

this topic is heavy in CFD which i wish i knew more about. im going to hit the books and search some other forums.

what would be REALLY neat is if i could get the dimensions of 2000 s4 intake manifold, 2001.5 intake manifold, rs4 intake manifold, and SPTurks manifold so i could model them up and give it to a coworker for some CFD analysis! then we could get a better idea of whats going on

[jibberjive]

what would be REALLY neat is if i could get the dimensions of 2000 s4 intake manifold, 2001.5 intake manifold, rs4 intake manifold, and SPTurks manifold so i could model them up and give it to a coworker for some CFD analysis! then we could get a better idea of whats going on

Can anyone help him with this? Would be awesome!

[Knight_Rider]

can Anyone Help Him With This? Would Be Awesome!

Holy Friggin Throwback Batman!
Somebody Help This Man!

[JDM EJ1 95]

Just like on the Honda B-series engines...the edelbrock intake manifolds made 30 extra wheel horsepower and held the torque better through out the entire rpm range...I can only assume that with a bigger plenum on the s4 would act in the same fashion.

no intake manifold will yeild 30 whp on a Bseries (N/A)


NONE..

closest thing would be ITBs.. but even so.. not 30whp.


MAYBE 30CHP but thats still not beliveable


on a kseries. its a little diff story.

[BastardS4]

Anyone running this manifold, hows it working out?

[DxC]

good to see this thread come back from the dead.

i will have a stock 2001.5 manifold soon, so when i get it ill start messing around with it. i really really want to quantify the gains/changes in airflow / power

[WMi_S4]

what the hell is the is SPTurk mani??? I have never heard of it before......is it a custom mani that SPP does or something???

[lowered97a4]

[IMG][/IMG]

[sCeRaXn]

Is there any porting involved with that manifold, or does he just weld a box onto the bottom of it? Its really hard to tell if the runners have been ported from that pic. I can see some gains from that, but if he doesnt do anything to the ports then hes just restricting the extra airflow that he just freed up.

Any other pics of it?

[lowered97a4]

[IMG][/IMG]

[revhards4]

no intake manifold will yeild 30 whp on a Bseries (N/A)


NONE..

closest thing would be ITBs.. but even so.. not 30whp.


MAYBE 30CHP but thats still not beliveable


on a kseries. its a little diff story.

I never mentioned naturally aspirated...that manifold is almost always used on a turbo build. Made a world of a difference on my 2.0l, held torque almost all the way to redline

[BlackS4TT(Josh)]

I'm not crazy about that expanded manifold... You mentioned a lot of R&D went into it... can you tell us what R&D? Was it flow tested? Running different amounts of air to each cylinder can cause boo boos.

[RenegadeEngr]

if someone can give me an assembly in proe or solidworks I can run the CFD through Fluent

[jibberjive]

What does SPturks charge for the mani and are they still being made?

[Dan@JHM]

ive got a spturks manifold for sale btw, pm me if your interested

[DxC]

ive got a spturks manifold for sale btw, pm me if your interested

not running it on your GT car? why not?

what are you gonna run?

[Dan@JHM]

not running it on your GT car? why not?

what are you gonna run?

right now just stock but in the near future an rs4 setup.

[DxC]

if someone can give me an assembly in proe or solidworks I can run the CFD through Fluent

well it wouldnt be an assembly, as it is only 1 part ... but i am working on creating the geometry in pro/engineer now. ill make a stock version, and a couple tweaked versions... are you good with Fluent?

[Mark@AutoSpeed]

The key with any part that has air flowing through it is to use common sense, pretend you are the air and use smooth transitions. We have been modifying manifolds for a few years now and have seen good results on the GT cars. Have a look at the following pics and observe that to properly reshape the casting areas and remove ALL sharp edges, the bottom of the manifold must be removed. Then you can have full access to clean up the entire area. Without removal of the bottom, your results will be minimal at best.

Here is the stock manifold, note the casting plate has been removed. I couldn't find any profile shots which shows the abrupt angle change when the air enters the plenum.




This is a pic that someone posted earlier in this thread...

There are still many edges that are rough, sharp and gouged. the work done from the pic above does not look very clean and will create unwanted turbulence. Although probably better than stock, but if you are going this far then you should take the time and do it right.

This is a pic of our ASP design. Note how smooth the bells are around the inlets to each cylinder on our mani vs. the stock and other versions, we don't have any sharp areas as seen in the prior posted pic. Also note we smooth the entire interior, not only the bells, but side walls in between, everywhere. This is important to minimize the areas for turbulence. Also we typically smooth out the inlets and then leave the outlets at the injector port semi rough, never polished as you want some casting grain here to help promote fuel atomization. A super polished exit from the mani will only help fuel pool when cold and cause misfires and carbonization leading to the valves.


Next we did some calculations and determined we wanted to add approx. a 1" rise in the mid of the plenum. This was a good compromise to give us some extra flow volume while still allowing us to clear the after run pump/plumbing. Note the bottom of our billet scoop has been designed in CAD to determine the smoothest curve to basically allow the air to flow very smoothly, this allows for better acceleration under TIP IN and WOT transitions.





Hope this help show the main differences of stock vs. modified and help visualize why it works. The 2.7 has all in all a very good quality from the factory, but the manifold casting is just not that good. For creating 250 crank HP its fine, but more than that it needs some love