hi everybody i want to know what is the stock psi of evo goes,because i heard some body said is 19 psi and some body said is 14 psi so which one is true and i want to know if the stock psi is 14 how many psi can i go(is safe)
and one more thing why when i install the SBC and i turn the SBC on OFF mode (want to use in stock boost )but i thing my car is more slower than before why?is this is when using the boost controler is like that or i install wrong.
thanks for help

 

I believe spec is 1.3 bar, which equates to 19.11 psi (I may be mistaken, going from memory). But from what I have read here, there seems to be some variance in what people are actually seeing on full stock set-up.

 

After spool up, it hits about 19 psi. At around 5000 RPM, it falls to about 16.5 psi. With 93 octane, a MBC, and no fuel tuning, you can lock it at 19.5 psi across the RPM range with no worries.

Josh

 

We have Jap version Evo here in Hong Kong and the stock Evo 7 here is 14.5psi all the way. I was told the Evo 8 are the same. We have 98 octane here in Hong Kong and even higher in Japan. Is that why Japan version has 280hp at lower boost?

 

one time i get the boost up to 21.5psi in couple minute ,so did you think it will damage the engine

 

Stock is Max 19 and drops to 16, your fine dont worry lower ur SET down abit keep it at 19 20 MAX !! and you will have a fun car

 

When u turn off Your BOOST controller you going to hit only 10 psi because our wastegate is set to 10 PSI. And your not using the STOCK BOOST solenoid anymore so of course it doesnt HIT 19 like stock get it >?

 

Hey guys, is this the same boost level for an EVO2?

96 Octane gas. Currently set to .7 bar.

just got it from japan, with mystery mods, so lets play safe and assume internals are stock.

How high do you think I can go safely?

 

wtf?

 

Non-US 98 octane is actually a worse grade than our 93 octane. Our 93 is more like 103 octane for you guys, because of the different method of testing used. Therefore your 98 will be more like our 91 octane.

Josh

 

 

highwaychild: Assuming I have the ecu, injectors, how high a boost can I go with stock internals?

 

Yes non-US octane ratings are RON only, but in the US we take the average of the RON (research octane number) and the MON (motor octane number). The RON is always higher than the MON (it's a test conducted under a set low load) as it is the projected "best" octane rating (detonation prevention) number a particular fuel can yield.

Example (not real, just hypotheticals):

94 octane US (R+M/2 method) = 100 RON + 88 MON / 2

98 octane non-US (RON method) will likely be closer to 91 octane using the R+M/2 method. Example:

98 RON + 84 MON / 2 = 91 PON (pump octane number, the result of the R+M/2 method of averaging RON and MON octane ratings)

 

19psi 3500rpm, 16.24 psi 6500rpm

 

Evo 2's have big 16G turbo's and 520cc injectors stock (I think they are 520's). Look at your turbo and see if it is upgraded. If it is larger than a 16G, chances are your injectors have been upgraded. Your injectors should be yellow topped if they are stock (prety sure of that). If they are blue on top.....like a light blue, they are 450cc and you want to change them out, even on the stock turbo.

With the Evo 1-3 4G63, you can run up to around 18 PSI on the stock internals, as long as you have fuel support. Upgrade your fuel pump. If you think you have an upgraded fuel pump already, you can usually tell by turning on the car and listening for it. If you can hear it from the inside of the car, turn on the blinker and see if the sound of the "whine" changes up and down with the flash of the blinker. If it whines, you most likely have an upgraded fuel pump. After fuel pump upgrade, rework your fuel map. For a fairly stock 4G63, the APEXi S-AFC has been a well proven tool. If you have no fuel tuning hardware or are running the stock injectors, I would keep the boost set at 16 PSI. Get a mechanical boost gauge, a fuel pressure gauge, and an exhaust gas temperature gauge and mount them in the car. Boost and fuel pressure should be mounted really close to each other so you can watch them both rise and fall together. The gauges are important for tuning. Playback options are nice, but in reality, basic, reliable, mechanical gauges are good enough.

I hope this helps you out.

Josh