i am just about to tune my rx7. my mods are

re-amemiya intake filter
catback,downpipe,midpipe
apexi power fc
v-mount intercooler
walbro 255 hp
stock twins

i want aprox 300 rwhp. how much boost would i need? i much do the stock injectors hold? 13psi? 15psi?

 

The stock injectors should be fine for 300 whp. cf. http://www.rx7.com/cgi-local/3rdgencalc.cgi

However, I would not run the stock twins much beyond 13 psi.

Please search for lots more information.

 

it depends too how lean you tune it also. The injectors should be good for 300 hp and a bit more, just keep an eye on the duty cycle as you tune. does your v mount have a good air duct going to it?

The injectors aren't really dependent on a certain boost level either, a ported engine will max out the injectors at a lower psi for instance. Just the same as a larger turbo will max the injectors out at a lower psi then the stock twins.

 

thanks for your inputs,,,,, how much boost can the stock turbos hold safelty?
can i have to settings of boost, one for street and another for strip?

 

the stock turbos have 270 degree bearings in them, and generally over 14psi is a death warrent for them.

 

they arent very efficient beyond those levels anyways, so you wont gain much HP and just end up heating the air. How much boost you can run also depends on the condition of your turbos at this point. new turbos will hold up to higher boosts longer then turbo's on their way out obviously.

 

so i can imagine that with my mods and 13-14 psi i can obtain over 300 whp?......cause i have seen people with similar mods making 350 whp at this forum....eventually when my turbos get tired or me. i will eventually move to single turbo.

 

Steve Kan tuned 13.5 psi @ 300rwhp, duty cycle of 95% yikes!