Anyone ever use a S5 UIM with the S4 LIM and succeed?
 

I've got the whole S5 intake system sitting in my garage minus a fuel rail and am getting ready to adapt it to my S4 GXL. I already shaved the metal off the irons and the TB that I need to (definatly using the S4 TB with the setup) but I'd like to keep the S4 LIM.

One of the aux. port rotating shafts on the LIM is broken on the outter side on my S5 system and I'd rather use the S4 aux. port actuators so I don't have to actuate those electronically as well.

The only problem I've seen so far is that the outter two studs on the S4 LIM don't line up on the S5 LIM so I'd need to drill the S5 UIM to make them fit. I'm also not sure the runners match up but the tape meassure says they should be pretty damn close.

Thanks for any ideas!

Does the S5 Lower Intake Manifold not fit? seems like if would be a lot easier to put on of those on...

But the s4 LIM flows better :(.

yeah I have been running that set up for the last two years.

http://www.mazdamark.com/Engine4.JPG

You only need to drill one hole onthe S5 UIM (not two as you mention):
http://www.teamfc3s.org/forum/attach...&postid=169987

And then trim a little on the outside of the runner
http://www.teamfc3s.org/forum/attach...&postid=169989

Don't forget you need a S5 fuel rail or reverse the PD on the S4 main fuel rail:
http://www.teamfc3s.org/forum/attach...&postid=169986

And bend the MOP rod to fit:
http://www.teamfc3s.org/forum/attach...&postid=295836

actualy much more work to use a S5 LIM on a S4 car. You need to fill a passage.
http://homepage.mac.com/carldavis/in...s/p6230027.jpg

And it has higher volocity, but lower volumn flow.

Very cool, thanks Icemark. ;) So I should get both S5 fuel rails then? It's hard to tell from the pics, but did you use the S4 injectors with the S5 rails?

I wasnt aware you were running a carputer, sweet, we must chat on aim sometime.

Couldn't a bored out S4 UIM give you just as much power?

I don't know, I never looked into the option. Even if the diameter was increased the S4 UIM wouldn't have the VDI function which I've read creates a good deal of the added power for this modification.

I also don't feel like boring a S4 intake out when I have this perfectly fine S5 UIM sitting here in my garage that I basically got for free when I purchased my 'vert wheels. :D

I just finished putting a new mobo and processor in, I'll make a post in the interior/audio section in a couple of days when I get it running again. ;)

What if you have (will have soon actually) a banjo bolt instead?

well you need the S5 2ndary fuel rail no matter what, but of the primary rail you can either swap the PD (which is normally on the output side of the primary rail) with the banjo bolt (which is normally on the input side of the primary rail) or use a S5 primary rail.

So the swap again, the PD moves from the front of the non turbo fuel rail, to the rear, and the bolt moves from the rear to the front.

Of use a S5 rail. The draw back of the S5 rail is you can not change the PD without changing the whole fuel rail. Either way, if the PDs are original they should be replaced with new ones to prevent fires.

And to answer masao, I do not recommend the banjo bolt replacement, however if you do wish to band aid the fuel rail, you could use a banjo bolt to replace the PD and not have to swap sides... the draw back of course is the fuel injector harmonics get shot to hell.

Well, I drilled the runner out and cut the groove for the nut to fit. It goes on real well and lines up perfectly. :D The only problem I had was that I ground a little hole in the runner so I had to create a little JB Weld cap but it should be just fine.

I was comparing BAC valves as well. I don't actually have a S5 BAC valve but it looks like the S4 will bolt up and I just have to move the lines and connector. I'm not sure if there are many differences between the two but the S4 looks like it will perform the same function as it did on the S4 intake (the only difference between the BAC area being that it's split and lower on the runners.)

Yeah if you look at the BAC valve, there is a small star point screw on it where the air line feeds into the BAC. If you loosen that screw you can adjust that air line input to any angle. Of course you will have to extend the wiring for the BAC to the passengers side of the motor. On a non turbo BAC, the plug will rest against the 2ndary fuel rail, but it will fit.

This is what I did for the Vac lines... it seems the best compromise:

http://www.teamfc3s.org/forum/attach...&postid=279670

Green for fuel
Yellow for air bleeds (fuel and oil)
Dk Blue for pressureized air lines from air pump

Cool, thanks again Icemark. I don't have more then five vac. lines right now after my emissions removal so it shouldn't be too hard. :D I'm definatly going to make a catch can for the PCV after seeing how nasty the inside of those runners were. The back of the throttle plates were pretty gross too.

No. The S4 UIM is already bigger than the S5.

The main advantage is the runner length tuning that the VDI provides.

Pretty much consider the S4 LIM and S5 UIM the optimal set up for a stock or minor street ported motor, but with a major street port or larger the S4 LIM and S4 UIM would be better as the runner length becomes secondary to the amount of flow.

Becarfull grinding around where you have to drill. The s5 manifold is only so think and you can easily grind right through it. If you do you can use some JB weld to repair it.

Amen to that, i just went BACK to s4 manifolds this weekend and theres a huge difference.

Yeah, I'm keeping mine around in case I ever have to crack this engine open and port it.

Icemark, what have you found to be the best RPM to open your VDI at?

Thats the first time I've heard that. I have a neighbor whos putting in a V8 in his 91 and I was gonna swipe his uim and rotors. I have a large street port, so I guess I'll keep my uim.
So could you port out the s5 uim to give you increased flow with the better lenght runners? Or is that even doable?

Is a s5 UIM and s4 LIM good for a big port when extrude honed?

You could have a S4 LIM and S5 UIM hone and extruded, for around $500...

Yeah I know, but I'm curious to how good they are for a big port when extrude honed.

Or is the s4 combination fine?

I had been replying to the post before yours, but I know Icemark went for an extrude honed S4+S5 combo for one of his high HP NA projects. I imagine if you need good flow the S4 would be good, and if you need awesome flow, you'd have to go custom.

Yo whoops.

Must of missed that :eek: !

But he said for a big streetport s4 intakes pwn a s4+s5 intake combination. I was wondering where extrude honing would fit in.