hi guys

I have an evo 7 with the following mods :

-blitz catback exhaust system
-3 inch downpipe no cat
-hks racing suction pipe
-HKS Twin plate clutch
-walbro 255lph
-hks bov
-koyo radiator
-greddy intercooler and piping kit

I just orderd Apexi Power FC,ARP head bolts,and Invidia o2 outlet

whats the maximum boost i can go ?i am using 95 octane
do i need bigger injectors,colder plugs or a FPR?

I want to get the maximum horsepower from the stock turbo and stock cams
thanx in advance

 

+ I am going to buy GReddy Electronic boost controller to turn up the boost

and sorry for my bad english

 

anyone !!!!!

 

Get a wideband and a FPR...
Can go upto 1.7 bar....

 

yep 1.7 bar max until you get some fuel injectors.

 

i run 25 psi on a 20g turbo with my mods. no knock no problem

 

thanx guys
so if get bigger injectors (680s) can I run more boost or what ?
is it safe to run 1.7 with 95 octane!!!!!!!

 

95 octane is higher than we have here. There are people running 22 psi on 93 octane which is about 1.5 bar. I say you can increase to 1.6 bar safely. Btw, this is with stock injectors.

 

Where are you located? If outside the U.S., then the available 95 octane gasoline probably has a R.O.N.(Research Octane Number) rating. If so, 95 R.O.N. gasoline is equivalent to the 91 octane gasoline sold in the U.S. the U.S., the octane at the pump is derived at by adding the Motor Octane Number to the Ressearch Octane Number and then dividing by two:

M+R/2

 

I am located in Oman
which is 250 miles away from dubai .. in dubai they have 98 octane

sorry i dont know anything about what R.O.N means

 

Dude, our fuel in the gulf is some 93Octane..

If you wanna run up to 1.7bars and more, you get yourself ARP and Head Gasket (Cometic or HKS 1.2mm)

I'm going thru the same 'ordeal'.. I'm yet to tune my 50Trim setup and i'll pbly reach 2.0bars so I really didnt like the idea of having a Head Gasket change but it will sure save my engine in the future..

Wael