Like the title says. Does anyone still make fd uim adapters? I saw a really nice one made from a place in Japan, but I can imagine it costs an arm and leg. I'm thinking of fabricating my own and just got a piece of 1" thick aluminum. Anyone have hood clearance problems with 1"

BTW, I saw mazdatrix selling fd throttle body spacers. I did a quick search and didn't get as much info as I was hoping. I am in the process of modifying and porting my s5 lim and fd uim and throttle body. Im going to start porting the parts and making the adapter

 

i was thinking about it, i have the FD side drawn up, it just needs the FC side, and then i need to print a plastic one, and make sure it fits...

i was gong to have one with some injectors in it, i want to add fuel in a way i can remove when its time to smog the car

 

The hardest part with that is the length of the adapter. It can be done though. I'm going to a cnc machinist tomorrow to see how hard or would be to make it. I could keep you posted. You would have to add in your own injector bungs and fuel rail mounting though.

I'm on my cell phone so I don't seed where you are from. But in ca there are so many regulations that anyone thinking of adding extra injectors and thinking about passing smog would need more than just the uim swapped to stock

 

i think mine is 1" thick? its a pretty simple part, it could be done on a drill press if needed.

the HKS T51 was CARB approved...

 

GP- you dont NEED an adapter, some porting and a tiny weld in one spot is all you need

 

I have a spare rising RPM one... but no hardware for it. PM me if you're interested.

 

I know, I saw some of the posts and pictures. One thing I was curious about was the gasket sealing surface, and flow. With the adapter you can have the full sealing of each manifold and have better flow.

I talked to my buddy that has a cnc shop and I am going to make my own cnc. There were going to be minor modifications to the fd uim( slotting the holes), I was going to use the s5 t2 bolt pattern to clamp everything down.

 

I wonder if there is a plastic one that could hold the heat and seal. My throttle body spacer for my s4 t2 manifold is plastic.
Btw, I'm thinking about making a throttle body spacer also. Anyone ever dyno it before? My only concern is clearance to mc.

 

yep, nylon is what all the OEM's use.

 

old hot rod trick was to use a wooden and later plastic spacer under the carb and now they are using them under intake manifolds of SC motors to keep them cooler

 

we can actually 3d print wood... its pretty easy to draw up the part, but then making it we're limited to steel/aluminum or ABS/acrylic. the plastics are borderline in heat capacity, and ABS doesn't like hydrocarbons, so we have to go to nylon, which is what the OEM's use, but its $$ right now.

or you could just buy some wood and a holesaw... its not the most complex part

 

I dont have any data to back up the flow, but picking up the little bit of CFM from the throttle body and UIM more than makes up for anything from the lack of adapter.

Its not like the adapter transitioned the flow, all it basically did was extend it straight anyhow

 

it works on a v8 because they gain plenum area, FC might be different

 

I like to think if it were a proven benefit EVERYONE would be doing it.
Even as a benefit for cooling im sure it only works for a short period of time before the spacer and whats bolted to both sides of it becomes the same temp

 

Well one guy on the forum and did a dyno, his peak hp number didn't change much, but torque and hp high mid range was significantly better with little to no drop in power across the powerband. Adding a throttle body spacer would increase plenum volume without purchasing a custom fabricated manifold. The best example i could think of its the 350z. That is my reasoning, but I guess nobody ever dyno ed before and after. If you could put a price on hp and torque per dollar spent on modifications, how much do you spend per hp?

 

If you make a tiny weld between the primarys then port match them (s5 to s6) you can make a MUCH smoother transition between the 2, that should flow better then the kind of angeled adapter, i did the weld, porting and then milled of the mating surfaces, cost me about 100 usd (i had a pro do the weld and the milling but did the port matching myselfe),

 

Do you have pictures? How far in did he weld to make the transition smooth? The spacer I will be making is 1" thick, and I will be porting as well

 

That's not exactly true. The intake air is cool and the insulator heat transfer rate will keep the bias towards the cold side if it is truly insulating. In other words, the incoming air sucks more heat (not necessarily a lot) than the heat the insulator is allowing to reach the aluminum (high heat transfer) intake.


As far as I know there are only a few truly oil and gas safe plastics, nylon leading the pack. There are some harder neoprene type materials out there now but the application will decide if they are usable.

There is other stuff available for those that are interested. Here is a listing for insulation material used in the molding industry to keep the heat soak through the hot half down. Of course, it can't be printed and one would need to machine it.

Press Platen Insulation

 

disregard