would it be safe if i dynoflash an stock evo for 22 psi with just an bov to hold the boost???

 

Being safe or not is not the question. 22psi is "safe," but not altogether optimal with no mods. I'd suggest 20-21psi, but 22 won't be unsafe.

 

would 22 be safe/optimal with fuel pump,mbc,dynoflash,full IC piping kit? edit: and stock bov :<

 

Again, safety is not the issue. Optimal is the question, though. I think 22psi is a little too much, but it depends on your car, your weather, your octane. If I try to run a steady 22psi, I knock and pull timing. If I set my boost so that it spikes momentarily to 22psi, but then settles in the 20-21psi range, then I'm fine. Other cars are different, though, so you'd have to log some 3rd gear pulls to know for sure...

 

wouldn't know how to do that. i'd be on 93 octane. the weather out here is currently about 55-60 degrees. we both have the same car though, for the most part. anyhow i was thinking the upper and lower IC pipes would help reduce knock but i could be wrong. i dont know much about tuning or even were to begin learning about it.

 

IC pipes won't affect this.

If you aren't doing your own tuning and don't have a logging device, then I suggest 21psi. on 93oct. Many people drive around with their boost set too high and say, "I run 23psi with no problems!!" when in fact they are knocking on the top end and pulling timing, but don't know what it feels like, because all they feel is the rush of torque at 3800rpm, which makes it seem powerful.

 

kk, i'll be sure to set it to 21 when ever i buy my mbc then. thanks warrtalon.

 

i'll have ic pipes, intake, turboback, bov so im assuming a fuel pump would be an good idea to run 22 psi with no knock?

 

What warrtalon is saying is that 23 psi may not provide the best performance. A lot of people have trouble understanding that less boost can sometimes produce more power. As the pressure goes up, so will the heat in the intake charge. The ECU may have to pull timing to reduce knock. The net effect will be less power. Dropping pressure may (although sometimes it may not) decrease the mass of the intake charge, but the gains from the extra timing more than offset this.

EDIT: typos

d

 

NO, a fuel pump won't affect knock. You will just want to get a fuel pump if you get flashed, since that will allow you to extract more power with the same setup. Without a tune and with no intention of raising boost beyond pump gas levels, you won't need a fuel pump.

 

This isn't clear either as there is are still some reports of stock vehicles providing inadequate fuel pressure at high altitudes.

d

 

IMO there have been enough documented failed/failing stock fuel pumps on modded Evos to put an aftermarket fuel pump like a Walbro 255 on the "cheap insurance" list of mods - especially for cars run at high altitude (i.e. 5000 ft or higher).

l8r)

 

like warrtalon, i set my boost to spike @22psi and settles down to 20 on 93 octane, been on the dyno and no prob at all, the car is not pulling timing or running lean after a custom reflash from jester tuning. oh yeh no fuel pump, the stock is doing a very good job, did runs back to back and the AFR was always consistant.