Hey guys,



I've heard that you can take a FD upper intake manifold and some how make it fit a lower FC intake manifold and get some extra HPs. Just wondering how to do this and how much it does? I'm rebuilding my FC and getting a jdm turbo motor. I'd like to get much done as possible to it before it goes in. I have a T4 turbo and a FMIC ready to go in. Along side a BOV, boost controller etc..



So if anyone could help me out on this that would be great.



Thanks,

Vince

www.wickedrides.ca

 

yes you can do that..FEED makes and adaptor plate but its a little pocket heavy I think aroun 350. with those upgrades don't forget fuel to match the air of that turbo..people that have done it think it gives about 10 hp.. but I haven't seen any dyno sheets of it.

 

Should hope it's more than 10 hp, you'll need an FD TB which has +5mm on each secondary throttle plate



So bigger runners and bigger throttle



You also need to do some fabbing for the throttle cable to work on the brackets (minor, as far as I remember).



After it's all said and done it's pretty damn close to the master cylinder, so space is limited

 

[quote name='Midnightdriver' date='May 5 2005, 01:48 AM']yes you can do that..FEED makes and adaptor plate but its a little pocket heavy I think aroun 350. with those upgrades don't forget fuel to match the air of that turbo..people that have done it think it gives about 10 hp.. but I haven't seen any dyno sheets of it.


[/quote]





You dont need the FEED adapter. The runners can be port matched, and some of the mounting holes need to be re-drilled.



Kahren dyno'ed a 6 port with a TII/FD intake manifold, and saw almost no gain from it.

 

I have done it and I can't comment on the hp benefits just yet, but as far as I am concerned it looks good and less problems working beneath the manifold if I need to, with the 2nd gen manifold you usually have to remove it to do anything below the manifold.



I port matched my setup and drift drilled a couple of mounting holes and VOILA.........had it done, motor runs fine, just have not driven it yet.



The performance benefits may not be readily seen in terms of hp but increased torque because of the increased length of the intake tract over the stock TII manifold. Everybody always look for more hp and nothing else. The FD TB is larger than the TII TB so there ultimately will be gains somewhere to be had be it hp or torque.

 

Got a question, which is better making the adapter or part maching the intake manifold to the lower? Or would that hurt the performance on it by port matching it?

 

The biggest thing I noticed was the difference in response. I think it made a big difference, but I also had the TB ported and went to custom 90mm piping.

 

Hmm lets go step by step.



First realize it'll be easier if you get rid of all your emissions stuff and your idle control stuff, i already got rid of mine before doing the swap so i could be wrong, but i dont think you can make FD stuff work on the FC.



Secondly, you must have an s5 lower.



Third, its better to use on a turbo'd car, on the n/a's you lose the dynamic chamber etc etc.



Fourth, on the FD UIM you'll need to center the UIM to the s5 LIM using the center hole (where the long bolt goes) and then stretch out the bolt holes accordingly on the FD UIM.



Fifth, Port match the primaries of the UIM to the LIM. But be careful when properly port matched you'll only have about 1/8" of gasket sealing surface between the IM's.



Sixth, You'll need an FD Throttle Body, FD TPS, Fd Throttle Cable, and depending on your setup some type of TB Neck piece, it's easiest to do this with an FMIC so you can get the Greddy Unit and use it. The THrottle cable you dont need, but it makes it easier. The TPS, if you're running a standalone, yuo can use the piece the Haltech uses.



Seventh, Gotta trim down your Oil Filler Neck Base, or switch to the FD Oil Filler Neck Base (i think it's $80-110, gotta call mazdatrix as they dont list it but its on their full price list). I trimmed my stock one down real low and had it welded back together, and i still have only about a 1/4" space.



Eighth, Use an S5 Gasket since it will provide the least amount of restriction between the UIM and LIM.



That's about it, and while you're at it you might as well port the FD TB, remove the UIM's Butterflies and port out that area a bit etc.



That's pretty much the whole thing, its a lot easier if you're running a standalone, dont have to worry about adapting harnesses etc.



kevin.

 

[quote name='teknics' date='May 5 2005, 03:42 PM']Hmm lets go step by step.



First realize it'll be easier if you get rid of all your emissions stuff and your idle control stuff, i already got rid of mine before doing the swap so i could be wrong, but i dont think you can make FD stuff work on the FC.





kevin.


[/quote]

I'm doing one on the stock S5 Turbo ecu along with an emanage.Has anyone tried to use the FD's BAC valve with the stock T2 ecu? I wonder if the the stock T2 BAC can be adapted to the FD upper.cheers



Technics ,very nice summary by the way

 

Thanks Teknics, now to find all the parts to do it lol. Hopefully in a couple of months I'll be able to show you guys some pics of the car. Lots of mods are happening to it. I dont even think it's going to even look like a RX when it's done lol.



Thanks,

Vince

www.wickedrides.ca