hi 2 all

im new here..

i own a 2005 evo8

recently i add a 3" catback, and soon it will be turbo back exhust system, just need to get the downpipe..

anyway, i want to get a bit more boost, ive been told all i need is a boost controler and a fuel pump

they told me in the local tuning shop, that greddy profec b + walbaro 255 fuel pump will do the work. 1.5bar of boost.

now to the qustions.

1. how much is the original boost in the evo 8?
2. im not sure if only a fuel pump is enough to get more fuel.. is it safe?
3. i know the best is just get a reflash for the ecu, but in israel there is no one that makes for the evo, cuz they are realy rare here... they have all for the scoobys... but the evos is new here.
4. what is the safe range of temperture on egt for the evo? around 800 degree celsius?

tnx alot

Stas.

 

19.5 psi is the stock boost. You can turn the boost up to 21psi, and still use the stock fuel pump.

 

i would go for a manual boost controller such as the hallman or forge

 

I have a AMS boost controller in perfect shape. PM me if you're interested.

 

i got some more info

that the boost in the evo goes 19.5 psi and later drops to 16

the idea of the greddy ebc so it will hold the boos with no drops... the same as i had in my privius scooby


now my bigger qustion is

if that only fuel pump is enough to give more fuel to 22.5 PSI or 1.5 bar of boost

 

you'll be fine

 

You'll be fine, i spike 24 psi and hold 22.5

 

That sounds pretty high on pump gas, you sure your gauge is accurate?

 

Yes, it spikes around 1.65 and hold 1.55 or so, im flashed also, you can spike it but not good to hold 24 psi on pump

 

I'm flashed as well and around 22psi I will run slightly lean so I have to stick around with 21psi until I get more mods and another tune. That still seems like a lot of boost on pump gas IMO, but as long as your tuner knows what he's doing...

 

dude 24 spike is fine, also the 10.5 hotside evos boost to about 21 psi -2005 and newer stock tapering, u can set it to 21-22 with boost controller , exhaust, intake and flash safely

 

yes but plz remember i dont have any option to flash the ecu,

so i ask if this boos will be safe with not any change with ecu remap just add a fuel pump


i dont know the exact model of the evo8 i know there is gsr and more

but in israel they sold in one model

evo 8 265 hp 5 spd gear box

 

TES, your stock tune is already very rich. Adding a fuel pump will just make it more rich. You HAVE to get tuned when adding these mods, otherwise you're wasting your time and money. Just get an SAFC with patch harness to remove fuel and make some real power. There is no reason to just want to randomly raise your boost. You need to raise boost with the proper mods and proper tuning to make power.

You don't need a fuel pump in this case, but if you get tuned, then add one and raise the boost to 1.5 (21.75psi not 22.5psi).

Miguel, I don't really think you run 24psi. Your trap speeds don't reflect that, and it's not safe to run that much on pump gas. You also have had many many problems with your Evos, and I wouldn't be surprised if it's from running too much boost on pump gas. Also, you don't hold 22.5psi at redline. That's just not possible on the stock turbo unless you run mega boost above 26psi. It tapers more than 1.5psi, regardless of what your boost gauge says.

 

I didnt say i hold 22 at redline, and i spike 24 psi NOT hold it.... 2nd my traps are due to the crappy 60ft times as you can see, 3rd I NEVER had a single problem with my 03 and the issues i had with the 05 head gasket and freeze plug were due to bad factory assembly simple as that, so i dont know where youre getting "many many problems" yada yada yada!

 

You can hold good boost with the stock turbo Clayton. Take a look at this 3 image shots of the same log. 1st one early on the spool, 2nd midway on the log, 3rd at pass redline. See how I can keep a flat boost line from 3000 to 8000 rpms. All you need is a good boost controller. In this run (log) I am using the rpm off-set feature in the E0-1. Never say never. I don't know how many times I have to post this. It is not the stock turbo that holds many people back on boost. It is the tune and the equipment you use to control the boost. That is why the E0-1 cost more money. I can log with it, adjust how fast the turbo spools up, how early or late the WGA opens and closes, monitor A/F's vs rpm vs boots.
This is my low boost. On hi boost I can hold 28 psi+ pass 7700 rpms. Incredible, is it not?
That is why you can have a good flat boost curve and hold boost. It is all about the electronics and the tuner, .