legacycentral bbs

I wanna run 18 PSI... Im at 12 now,... my block is a rebuild... all stock... I have a WRX TD04 turbo, WRX manifold with Sti injectors and fuel rails... full exhaust.. boost and oil presure guages... I have a WRX fuel pump but am ordering a walbro and a FCD.... is there anything else I need.... when I upped the car to 12 PSi its never worked better it seems to love it... and I also plan on an Air fuel guage....

also what heads would I need if I want to run DOHC and how hard are they to get??

Intercooler
PP6
Dyno tune with wideband.....

got a FMIC... whats a PP6 and whats a wideband

perfect power 6, its a piggy back unit. and a wide band is a guage that shows you what your motors air fuel mix is thought out the power band as you drive and or tune.

how doesa piggy back work

a piggy back takes information from the sensors and changes them before sending them to the ecu. wat the ecu sees is wat the piggy back sends it. its tricking the ecu to run leaner/rich or run more/less timing and stuff like that

an I take it you have to get the piggy bakc specially tuned for your car... is my TD04 capable of 18psi

you have to tune the piggy back yes. And yes your turbo is capable of 22 psi, although its fairly out of its efficiency range. We have a few guys here in alaska that just tuned their td04's to 20+ just for the heck of it. Those suckers spool fast!

Don't get caught up in how much boost you are running. If you want to flow more air, you need a larger turbo. 14 psi out of my 30R and the same out of my buddies 16G are worlds apart.

Its all about efficiancy, and the pressure ratio's you want to push into a 2.2L w/ a TD04 are getting out of that range. It probably will taper off pretty bad near the top end.

But, larger turbos means more mods to support them and more tuning, which opens up a pretty big can of worms.

93forestpearl wrote:Don't get caught up in how much boost you are running. If you want to flow more air, you need a larger turbo. 14 psi out of my 30R and the same out of my buddies 16G are worlds apart.

Its all about efficiancy, and the pressure ratio's you want to push into a 2.2L w/ a TD04 are getting out of that range. It probably will taper off pretty bad near the top end.

But, larger turbos means more mods to support them and more tuning, which opens up a pretty big can of worms.

What Dan said couldn't be more true, and I don't think you really realize it til you see it. I have one car with the VF11 and another with a VF8. Even at the same boost level, you can tell the VF8 flows more and flows better.

I just want somthing very fast wth not taht much to fuvk with how much boost could i run withoout [piggy backl an wahts involved in pisggy back

A piggyback needed to be wired to some inputs on the ecu among other things. Not bad if you can read the wiring diagrams.


If you want a very fast car without messing with much, you need something other than a first gen legacy. Simply turning up the boost does not mean turning up the power.

piggy back = Apexi SAFC or HKS super AFR. It's either this way (cheap) or the PP6 (more$)