YearsOfDecay

it started life as a 1"x4"x14" block of aluminum!!!!!!!!!



A sharpie marker, a drill press, a die grinder and a belt sander later... wha-la!!

This is Comitatus's...

My next project will be s4-fd... any takers?????? (for an s4- I have to have the s4 manifold because the adapter has to be bolted to the manifold rather than using longer studs and lengthening the FD holes like the s5)

Stanello

iTrader: (1)

mmm, making an S4 one would be good too.

ddub

How much are you gonna charge for something like this? I just got done port matching my FD UIM and S5 LIM

YearsOfDecay

Port matching the manifolds without using an adapter creates a giant void space which will cause poor flow, which is why i wanted to see just how hard it would be to make one...

It wasn't that bad.. you just need access to a good press, a good air compressor and a good metal saw to cut it out. Oh.. and a lot of patience!!

I'm waiting til Comitatus gets it mounted to see if i need to widen the stud holes before i make any claims about making any more of these things

The lengthened studs and center bolt were sourced from Mcmaster-Carr. The aluminum bar stock was an E-bay buy..

I'd really like to do an s4 to fd next.. ..

But if i were to sell these, it would be 125-150 bucks.. considering the labor and materials involved.

ddub

Ah, for that price I'd just stick with port matching myself, it seems to have worked fine for a lot of people. Not sure what "giant void space" you're talking about.

91mazdarx7

looks nice so far keep us updated on the fitment i'd like to see how it turns out

iceblue

Are you saying this adapts a S5 LIM to a FD UIM?

Post the benafits and I may be interested in a S4 6pt to FD UIM

ddub

6pt? As in the n/a manifold? He's doing it for turbo LIM's.

Havoc

so how much of a flow restriction is the stock S4 UIM compaired to the FD UIM ? is it worth all the effort ?

staticguitar313

iTrader: (2)

adapters? meh . . . . . looks cool, i'm not that smitten about FD UIM's though

YearsOfDecay

I don't know if there would be any great benifits in doin an N/A to FD conversion..

You almost HAVE to do a standalone ECUY conversion

AND.. you'd have to come up with another way to mount the secondary injectors because N/A 6-ports have the secondaries mounted on the middle intake instead of the LIM as on the turbo models..

YearsOfDecay

For me... the big benifit would be in the greater amount of room under the UIM to mount my Marren Pulsation Dampers and route the SS braided Lines!!!!!

THe FD throttlebodies are better and the plenum is smaller with more direct airflow paths to the LIM.

PLUS, you can used the FD TPS with a Haltech or Microtech rather than mucking about making your own bracket and mounting the haltech TPS like I had to on my s4 manifold (what a PITA).

KEEP IN MIND... I'm not planning on making these things in any quantity.. if someone wants one.. i'll make it.. but I'm not advertising here.. I just wanted to prove that you can make them yourself, rather than paying some goon in Japan 350 bucks and then waiting three months for it to get here!!!!!

Oh yeah.. and when making a custom front mount, if you get the greddy elbow for the throttle body, it becomes MUCH easier to make the piping and still keep the PS and AC

staticguitar313

iTrader: (2)

really? might have sold me there . . .

91mazdarx7

so the FD UIM will flow better then the s5 can you tell any difference in power or anything or is it mostly for clearance issues with your aftermarket parts

YearsOfDecay

Yeah.. like I said... its a bit of labor to do it.... but I'll gladly walk anyone who wants to do it through the process.

If you already have the tools.. the aluminum will cost you about 25 bucks on E-bay.. the longer bolt and studs will cost you about 20 bucks from McMaster.. if you have to buy a die grinder... you can get a decent one for like 30 bucks... but you NEED a drill press... it would be monkeyshit to try it with a hand drill.. I guess you COULD cut out the finished adapter with a sawsall, but then you'd spend a HELL of a lot of time smoothing it out afterwards.

As for gasket matching the UIM and the LIM and then bolting them directly together..

think about the cross section of the intake runners... in order to bolt the FD UIM onto the s5 LIM.. you have to remove a a lot of material from the center runners, to the inside on the FD and to the outside on the FC so that there won'te be any overhangs or blockages.. th outer runners have to be machined too, but to a much lesser extent..

what you end up with is a big lopsided footbal looking vertical cross section to the runners at the point where the manifolds meet.. the air expands as it enters this area and then has to re-compress as it exits down into the LIM..

its like going from a 1 inch diameter tube into a 2 inch diameter tube and then back to a 1 inch tube...

that can cause allsorts of flow problems...

We all know that it works, and I don't know the extent at which the turbulence will rob horsepower...

BUT.. the whole idea of switching the FD manifold is to get better flow, and therefore, you don't want to do anything to mess up the flow and possible give up what you gained in the process.

YearsOfDecay

for ME.... its clearance Issues first and flow second.. I have a custome fuel system and I want to put a pulsation damper on both the primary AND secondary rails and feed each rail independantly... there isn't any friggin room unther the s4 or s5 maniflod to mount the Marren PD.....

There has been some discussion about flow in the s4's because the runners are so much different is size.. that you might not get that much more flow out of it..

BUT.. I'm going to make one for myself because... Dammit.. I want to try it!!!!

WonkoTheSane

iTrader: (2)

Awesome work, YearsOfDecay.. I need to make it down to york one of these days...

ddub

It's true that isn't the best, but if you did what I did and made the transition from the port to a good amount down a nice gradual, smooth slope it'll provide for a better transition. I went as deep as I could on the FC LIM and it feels perfectly smooth and not very lop-sided at all. As well with the FD I went in as far as I could reach, seems like it should work out fine.

YearsOfDecay

Yeah... good thinkin.. Sounds like you planed it out pretty well and gave it some thought before you did it..

I'm not hacking on ya.. I thought about doin that myself.. If you did it that way, it shouldn't be that bad..

Besides... who the hell is going to spend the money to flow test the way you did it and one with an adapter... not me!!!!

but ive SEEN so really BAD ones where guys just did like 1/2 inch up and down the runners... YEESH... thats gotta make one hell of a pressure drop!!!

And as for the price i would charge... I have no desire to go into business making them!!!!! TOO hot.. TOO sweaty, too itchy with aluminum shavings pokin into my bald head and too messy in the garage!!!

But... if someone doesnt want to pay the JapSpec price and wait that long... I'll do it, for the aforementioned price!!!!!

rick_tj

As a fellow machinist, nice craftsmanship there man, keep up the good work. I like.

ddub

Oh yah, I've seen it done badly before many times, that's what I was trying to avoid

Comitatus

iTrader: (7)

Looks Great, bro!

Can't wait to get it all bolted up and see how it turns out...!
I gotta clean up my mani's and I'll start snappin some pics and post them up.

iceblue

The HP drop from turbulance is a heat exchange and a lack of flow. Turbulance makes the air heat up from bouncing all around against each others moliculs.

Now I don't know exsactly how presure drop works I would like to know if someone cares to exsplain. But in a overlooked theory of it, I would see the first pressurised air pass the chamber and drop do to exspansion. After this void space is filled and presurised back up, would this mean there is no more constant presur drop? Where the drop only accurs in the firsts instance of the pressurised air passing the void space?

WonkoTheSane

iTrader: (2)

You're almost there.. the only problem is that you're thinking of it at a constant pressure. No engine that I know of runs at a constant pressure. If you have a boost gauge, you can watch as you accelerate harder, the boost goes up, release the throttle, pressure goes down.. same on an NA, except with vaccuum.. harder you accelerate, the more vacuum you get. So you're theory would hold, except that the pressure inside an engine's intake is constantly changing.

limbar85

iTrader: (21)

omg....awesome job man! now...for the people that do buy it (i may even be one sooner or later)...are u going to provide the gaskets or just let us buy it on our own?