Hey guys!
so got a few questions, i will start of with mod list first

car=2006 evo ix mr
ams fmic
tbe
invidia 02 housing(recirc)
uicp and licp and intake(injen)
fpred turbo
cosworth 272s
step 1 colder plugs
percision 1k injectors
walboro single fp
stock motor, valvetrain ect. 30k miles

so my questions are, im doing a retune @ 28psi pump gas with the fpred, and wondering if that is okay? im only going to be reving to 7k-7.5k, just want some insight on if this is not/is a good idea or will the stock valve springs be fine?...as of now im 383whp/349wtq @25.9psi spike and tappers to 23psi by 7.4k rpm on efi logics dyno in CT. would like as much info as possible!

 

Bump, someone has had to have done this? Stock motor? No meth just pump gas at 28psi?, just looking for 410 to 430whp

 

28 psi is fine, but the tuner will tell you what the car is really wanting. If you will be rev to 7-7.5 all the time, I suggest you get a set of springs and retainers. Not to mention you will already have the cams out and this way you get it all done at once.

Did someone suggest colder plugs?

 

Ya forgot a couple things, ikh24s are already in aswell as arp studs, and all those parts are already installed, cams ect. And I never did valve springs springs ect....is that somthing I should be worried about only reving to 7.5k and 28psi on the red?, won't see 7.5 that often not autox or drag raced, just a weekend street car mostly, if its not that big of a deal, I really want theatleast 27psi, 25 just seems to low on the red and I want over 400whp and keeping the tq below 400, so I figure 28psi spike tappering to around 26 will still be safe but A LOT better then 25ish tappering to 23, and run it for a few months like that, then over the winter build it, any imput will help, I'm very new to evo's, thanks a lot guys!

 

28 psi is kind of high for pump gas isn't it?

 

That would depend on several other factors like what octane pump gas he's using and the rest of the tune itself.

 

Oh opps, will be 93oct. Shell VPOWER If that makes a difference?

 

pump gas is still pump gas.

I would be cautious going to 28 psi on 93 octane, but I would talk to your tuner first.

--mark

 

28psi is fine if you have a good tuner and good supporting mods

 

i would be cautious pushing 28 psi on a STOCK motor, ive been told 25 is as close as you wanna get with a stock motor, but who knows now a days, so much mixed info out there, ive got 35r with all essentials at 22psi making 390 whp 376 wtq on a MUSTANG dyno, im confused on why your not breakin 400 whp now at 26psi....????

 

the stock motor can handle at least 33psi since thats what mine spiked at. I would suggest you put springs and retainers in there though

 

I just want it to spike 27 to 28 psi and tapper to 25 to 26 which is where it spikes as of now...just hate how I spike 25 and tapers to 23ish, so changing the spike to 27ish and tapering to where it spikes now @ 25ish will impact it that much? Just when it tapers now, you can almost feel the turbo drop to 23 psi, but yes I'm surprised I wasn't over 400whp as of now aswell, but it was on a mustang dyno

 

If the taper bothers you, convert to ECU controlled boost with a 3-port.

 

But wouldn't it be safer to spike 27 to 28 and then tapper to 25/26 rather then holding 27/28 to redline? Again this is on 93 pump gas, he's a good tuner and will still be safe tune! Just want over 400whp on a mustang damnit! Lmao

 

I thought you were focusing on your boost up top. It would be better to run a flat 24-25 and eliminate the spike for stock motor. My car was in the mid 440-460 whp range (DLL and VDR) on a Red/stock motor with no more than 25 psi using a flat boost curve. With a built motor now I run a 29 psi peak tapering to 24 at redline (by design with a 3-port).