12A NA + 89-91 TII Turbocharger
 

I'm currently collecting all the go-fast bits to bolt onto my 12A NA.

I've bought and am awaiting the delivery of

Genuine Bosch 044
Surgetank
Carter Gold 4594 72gph 6-8psi
2x550cc TII inj, 2x900cc siemens inj
450x300x76 FMIC
Recoed 89-91 TII turbocharger
Sandwhich plate for oil feed (goes under oil filter)
Sard Rising rate 1:1 FPR (from ebay?)

The engine is a rebuilt 12A NA derived from an 82 12A and a 85 12A.

I used the latest 12A rotors 9.4:1 with the lightest weight, and brandnew housings. I used the tall port sidehousings and had them extend ported, as well as the exhaust ports. The engine has clearanced rotors, as well as a 3 windowed rear stationary gear. I used 12AT apex seals, with 12A springs. Straight cut corner seals with RX-8 springs. 12A side seals and springs. RX-8 oil cages with 12A o-rings and springs.

The engine is beautiful internally and only has 3500 miles on it.

I'm using a JDM spec 12AT gearbox and 4.44 open centre diff.

What power should I expect, what boost should I run. I know the S5 turbo isn't the largest and will probably have boost drop at high rpm, will it support 14psi all the way to 8000rpm? am I better running 14psi and shifting where the boost drops, what will make the most average power, not really concerned out peak...

I have a wb02 sensor and controller on way, will be using Megasquirt ECU, not that it really changes stuff. I've allready got the CAS working in my motor, and its running fine :)

around 225rwhp... that turbo will be your restriction.

So if the compressor can only flow 225rwhp, how do I get this from it at the lowest possible rpm? and hold peak power for as long as possible?

ie what boost are you suggesting I run, i will be using whatever spring is in the turbo to start with but I've heard past 14pound isn't safe, is that the ideal setting for my car?

12at
 

Hey mate , as i guide i have a internally std unopened 12at the only mods i have is Series 4 intake manifolds 2 x 12at injectors 2 x 13bt injectors and a hiflow 12a turbo (turbo has std 12a rear housing with series 4 core front housing and wheel)
Running a MT4 computer with a 12at dizzy.

10psi
http://img92.imageshack.us/img92/994...rintout8sp.jpg

the turbo starts getting out of it's efficiency range around 12psi +... but on my 12a turbo setup i was running 16psi daily. i had a tubular long runner manifold, 3.5"dp, 3" exhaust, etc... i was more than happy for a while :)

See comparing your setup to mine on paper, my turbocharger should be larger and better suited. S5 intakes are meant to flow better. I will have full fuel and ignition control. Exhaust might be the department letting the car down, might only be using 2.5".

So 12psi on the s5 turbo is a good choice of boost?

honestly overall power between the s4 and s5 stock turbos are not very different. i often see more peak power and almost always see more torque from a well setup s4 turbo. the s5 will yield more midrange typically.

either way you'll get your 200rwhp goal no problem.

my goal is 270rwhp, but i'll be happy with 230

270..... i highly doubt you will see that from a stock s5 turbo, but a hybrid no problem! :D

exactly what i was thinking cheesemonster

some info on what a hybrid is

the turbo 2 core gets a 60 mm compressor wheel , t4 housing and custom back plate to mate the t4 components to you existing mazda center section/exhaust housing!also your wastegate
will be enlarged and wastegate door modified/enlarged to prevent unwanted boost creep. this is a direct bolt on! no fabricating nessisary.this turbo is capable of making 350 hp easily! full boost by 3,000 rpm's!




here is a pic http://www.rotaryshack.com/Products/...p?intNotice=36

another http://www.rotaryshack.com/Products/...p?intNotice=34

Ccchhhhhhhhhhhhheeeeeeeeeeeeeeeeeeeeeessssssseeeee eeeee!!!!!!!!!!!!!!!

In Australia we call "Hybrid" Turbos "Highflow's". The guy I bought my turbo off also does these. It was double the price $225USD(for a reco s5 turbo) and $450USD for the highflow variant. I'm more interested at this point in time in getting more average power between 1000-4000rpm band than getting a big kick in the backside past 3000rpm

That said I do want to push the setup to the limit!