Does anyone have any info on putting a FD intake on a S4? HP gains? Thanks

 

It flows a hell of a lot better youll need an adapter plate to fit it on though. -Gabe

 

If you want to put a 3rd gen upper on a T-II lower it is nothing more complicated than a little port matching and realigning of two of the bolt holes between the upper and lower.

 

I can make an adapter plate or do some portmatching. Is there any significant gain from swapping the whole manifold or am I better off just swapping the UIM?

 

You can't use the 3rd gen LIM. Its ports enter the block at an angle (and ports in the block match that angle). The 2nd gen ports go into the block straight. It would be very difficult to make an adaptor plate that would suit the different angles. There'd be little benefit anyway, the stock one will work fine. It's easier to adapt the 3rd gen UIM to the S5 LIM than the S4 one.

 

hmmm im interested in this. so u cant make a plate??? how much do those manifolds go for??

 

what about a s5 upper and lower IM on a s4 would that give any gains???

 

Will an S5 LIM bolt onto an S4 block? Will an S4 TB bolt to a FD UIM?

 

im curious as well

 

are we talking turbo 2nd gen manifolds vs 3rd gen manifolds, or are we talking n/a 2nd gen vs 3rd gen?

 

turbo

 

fd uim on a s4/s5 lim. the s4 lim being harder (creative mounting) than a s5 lim.

if this is correct you can obivously use the fd tb, but is there a benifit in doing so? (dumb question but it will come up anyway). and another fd to s4/s5 swap the alternator. what else from the fd do you need to complete this?

luigi
fd owner looking to trade for a s5

 

For the Alternator, you only need a couple of little jumper wires, since the plug isn't the same, and a bolt and nut for the adjustable side, since the bolt hole is bigger, and the bigger bolt for the FD alternator doesn't fit the FC bracket slot. (at least mine didn't!) I made the jumpers with a male spade connector on one end and a female on the other. The side of the plug that has the black wire with a white stripe goes to the TOP connector on the FD alternator (of the 2 spade-type connectors in the area that the plug normally connects to- NOT the one with the wire that goes to the battery!)

Look on my site for more info: www.geocities.com/rx7_ragtop

 

I feel stupid now... 6 port 4 port.... ha....

 

s4 LIM, with 3rd gen UIM, Yes, it is possible. Yes there will be gains, but your better off going s5 LIM with a 3rd gen upper. S5 manifolds flow better then s4, they have larger diameter port runners. Adapting a 3rd gen upper to turbo II lower isn't that easy. The secondary ports line up fairly well and most of the bolt holes are close, but the primary ports don't line up worth a poop. Yes they can be port matched, but there will be a bulge in you intake runner due to all the material removed to make a match. Also, the 3rd gen manifolds have larger secondaries and actually smaller primaries then the turbo II manifolds. So the primary port runners will have a slight backward step in diameter unless you open it up a little. The best bet is either make an adapter so the port to port transition is smoother or do what I'm doing. 1st fill in the primary ports partially, add material were it lacks to line up with the 3rd gen upper. Fill it in with weld or aluminum braze. then re-port the entire runner to the stock diameter but offset to be able to line up the new upper. Re-surface your mating flange, now bore out the upper primaries to the same diameter as your new primaries. Port match the secondaries, go deep with the match on the LIM as the uppers are a little larger then the lowers ( this will give a nice tapering port runner). That's my take on the entire thing, its a little more involved then it sounds if you want optimum flow / performance. Doing this mod will require an after market EMS (engine management system) because the 3rd gen TPS is not compatible with the turbo II computer. Nor will the engines characteristics be close to what they were before the swap / mod leaving a stock computer's fuel maps way off.

No the throttles between 3rd gen and 2nd are completely different.

No a 3rd gen lower will not bolt to a s4, s5 block. Not even close...

Yes there are gains in using a s5 UIM and LIM manifold over a s4. And all that bolts together.

~Mike.........