What si the dirrerence between the s4 and s5 tb? Also can the s4 tb be put on a s5 uim? I was told before that it could but now i see sum1 in the for sale secton saying he had to modify his to make it fit. So whats the deal?

 

The S4 TB has linkage for the mechanic OMP, the S5 TB does not. The S4 TB has a narrow-range TPS, the S5 TB has both a narrow-range and full-range TPS.

 

while we're on that topic, what is the benefit of having a narrow and full range tps? more accurate fuel controll or something?

 

BUMP, many questions unanswered

 

there is some metal that needs to be removed to fit the s4 TB on the S5 UIM. check http://homepage.mac.com/carldavis/intake/mod.html and scroll down to the bottom of the page.

 

You can run a s4 tb with the tps on a s5 manifold. All you have to do is change over one stud on the manifold. I'm not running the thermowax or the double throttle so its pretty simple.

 

ANy specific info as to which bolt's?

 

im using an s5 tb on my s4, just had to put the s4 tps on and change the linkage a little to get it to work

 

The narrow-range TPS is really only used to tell the ECU whether or not the throttle is closed. The full-range TPS is used for transient fuel control (like an accelerator pump), OMP control, A/C cut control, injector kill for unflooding and some other things. Although the full-range TPS could be used to tell the ECU the throttle is closed, the much greater resolution of the narrow-range TPS allows this to be done with more accuracy.

FYI, the FD's TPS has both narrow-range and full-range sensors built into one unit, with two output wires.

 

Neat. So that above info is for the S5, one of the tps's is used to see if the throttle is closed, the other is for use of what you mentioned.

So why can't this all be done in one unit? I still don't get it..

 

 

Ok so can anyone tell em exactly what i would have to do to get the s4 TB on my s5 manifold?

 

You can't use the S4 TB on a S5, as it has no full-range TPS.

 

but that depends if u r using the s4 TB on s5 manifolds and a s4 engine, or if u are running a s5 engine.

 

Actually the manifolds and engine don't really matter. All that matters is the ECU. The S5 ECU must have a full-range TPS connected to it. If he's using the S4 ECU it'll be fine.

 

so if you use a s5 tb on a s4 engine, you'll need a s5 ecu?

edit: i can't type early in the morning

 

i have a s5 TB with an S4 engine/ecu. none of that matters, just the tps. you have to have s4 tps with s4 ecu or s5 tps with s5 ecu

 

No! The S5 ECU needs a full-range TPS. That is all that matters.

 

Ok well I have a s5 block with s4 manifolds in ym sf car right now. i want to swap in s5 port matched/polished manifolds to get the full benefit of a s5 engine. but im dont knwo what i need to do to get my s4 tb on the new manifold. I am keeping the s4 cause of the tps and the omp.

 

what? so you have.. an s5 block, s4 manifolds, s4 ecu, s4 omp, and s4 soon to be s5 manifolds?

 

yes The person who originally put the engine in (when it belonged to my friend) told us that the s5 block could be put in but we couldnt use the s5 manifolds(cause of the vdi) or front cover. This less than intelligent mechanic fucked up a few other parts of the swap. Well now that its mine I would like to put the s5 manifolds back on with a rmp controlled vdi. But I need to figure out how to put the s4 Tb on the new manifolds. Someone mentioned modifying a bolt. i guess if noone can answer Ill just figure it out when the time comes. DO you understand now?

 

not sure if its the same between N/A and TII, but on a TII the S4 TB will physically bolt onto the S5 UIM. just one of the nuts only threads on like 1 thread. I never had any problems with a vac leak or anything though when I had to do that.

oh, and since you have S4 wiring and computer(right?), yes you will need to use the S4 TPS/TB.

 

That sounds right, given that 1 TB screw on the s5 manifold is shorter than the rest and they all look equal on the s4. Well i guess ill find out when i do ti. Im still tryna fidn a writeup on boring out the TB. i see the butterfly mod on fc3spro but i cant fidn a step by step with pics for boring out the TB or porting the manifolds. The manifolds seems easy enough but I might just polish the tb and let it be with that as to not risk anything.

 

did you not follow the link i posted on the first page? it shows EXACTLY what you have to do.

 

Oh ****, i totally missed that. Me = ***

Thanks