i have decided to turbo my n/a, first to clear some things...a have done a very large amount of research an have made my decision accordingly. rebuilt s5 with really low mileage housing and irons that specked way above normal tolerances, ALL new seals and bearings,removed baffles,intake mod(full intake) etc etc.i have in my possession
s4 tii lower/upper intake, turbo, and mani and all supporting components. my intentions are to use the whole s4 t2 manifold with required modification to match ports, my findings and basis for the question is what do i do with the tps sensor(s) since the t2 has one and n/a has two?do i have to modify it to fit the turbo intake or cut and splice?this is the only thing i cant find any info on...

also just to make something clear so im not planetaraly blasted. if i would have bought a turbo motor to swap, i still would have rebuilt it from the get go and at least i dont have to do any wiring harness bull-arky.

just want a straight forward answer please.

 

Use S5 intake manifolds. Problem solved. Or swap the TPS/throttle body.

The compression of the S5 engine is higher then the S4 engine. Have fun tuning it.

 

the guru speaks!j/k sigh*i forgot about the .4 psi increases between the two.i guess timing will have to be key in tunning, i only really want to get around 200 bhp
so i figure some where around 5 to 7 psi on the snail tunning with the neo.
but ill have to try swapping throttle bodys,only problem would be position of them would be opposing each other.

 

It's a 0.3 CR difference, not psi. 9.4:1 vs. 9.7:1 rotors.

Anyway, what car is this going into? An S5 NA body? All S5s use the double plunger TPS; it's not just an NA thing. So, get an S5 TII throttle body, and bolt it to the S4 TII manifolds. You will need the S5 TII TPS as well, since the bracket is different from the S5 NA.

 

well actually ive decided to drop the whole thing cause i did a compression check and the numbers where way higher than what i was told by mazda dealer to look for. so now i need to find something else to do for more power.

 

your dealer told you not to turbo the N/A because the CR was too high?

 

^^That doesnt sound right^^, When you say you did a compression check, what did you do? and what were your numbers?

 

Are you kidding? This is the first time I've heard of anyone complaining that their compression numbers were too high. Anything around 100 psi total is great. If it's higher than that, even better. If it's lower than say 90 psi, a rebuild is near. Differences in compression ratio won't make noticeable differences in your compression test numbers.

 

puck mazda dealer!

 

That's completely ridiculous. The Mazda dealer was probably stating that the compression was too high for turbo (running the S5 N/A rotors, 99% of tuners will tell you their only good up to about 10 psi safely). High compression numbers off a test is a GOOD thing.

About your manifold question, I would recommend using the S5 N/A manifolds instead of the turbo manifolds. I believe you only have to change the AFM, boost sensor, and TPS. If you use the search function on this board, you'll find several threads about people using the stock N/A manifolds for turbo.

 

i dont know if i used the compression gauge right, but it kept on bouncing off of 200 210 psi on the gauge

 

go stand alone man.. I spent all this money trying to keep the stock ecu, and ended up throwing it in the stock pile.. safer and much easier to work with.
that way you can just use aftermarkey sensors

 

200 psi? something is def wrong.