How well does the EVO x react to increasing the boost with out tuning? I want to install a boost controler and increase the boost a bit, but I dont want to have to go tune it just for a slight up in boost if I dont have to. I am wondering if any of you have tried this and how did the computer handle it?

Also what is the stock boost level set at and what is kind of a safe limit to go to?

I do plan on purchasing a wideband 02 and a boost gauge at the same time, so that I can watch A/F ratios but I figured I would just see if some one has tried this already.

 

I am running a Blitz controller with no tune, other upgrades include HKS Intake, Exhaust (with center pip), IC Piping, and my boost controller. I personally haven't had any problems.

 

The ECU runs on a throttle voltage versus rpm 3D boost map ..

Using EBC you can cause an 'overboost' condition that trips limp mode at part throttle ..

If your EBC is controllable for part throttle boost, use this approximate

25% throttle ~ 0.8bar
50% throttle ~ 1.3bar
75% throttle ~ 1.5bar

 

The EvoX runs pig rich especially if you increase the boost. Although you may get higher boost pressures, the increase in power wouldn't be so high since the mixture is so rich. If you have a wideband, you'll be seeing 10-10.5 AFR, if you have a wb capable of reading lower than 10, you'll probably see 9's too.

 

^ I knew it ran rich, but damn, AFR's in the 9's. Might as well just pour fuel into the cylinders.

 

So no check engine lights or any thing? do you know what your peak boost is?




Well I was planning on using just a manual boost controler. I have always used them on all my boosted cars and never really saw the need for an EBC.
This overboost condition, would that just be the computer detecting knock so it goes into that decreased power mode?


well if you turn the boost up wont that lean it out some?

 

Nope, in stock condition the ECU limits boost at part throttle, and if you bypass that by using a manual boost controller it causes problems because the ECU looks at throttle position and the signal from the MAF sensor and determins that there is a "miss match" between the two readings and goes into limp mode... nothing to do with the knock sensor.

This problem can be tunned around by ECUtech programming if you are using a manual boost controller, and after it is out of beta testing I have no doubt ECU flash will be able too as well.

This is the disadvantage of a sophisticated drive by wire setup

Keith

 

Does this mean theres no limiting at 100% throttle.?

 

There is but based on MAP pressure only at that point.

 

The ZChip does not cause an overboost code even WITH a MBC.

 

ECUFlash can do it.

 

Oh ok I understand now. so the max you could go would be

25% throttle 11.6psi 0.8bar
50% throttle 18.5psi 1.3bar
75% throttle 21.8psi 1.5bar


Now than next question, who makes a boost controler like this? I mean I am definatly no stranger to boosted cars but this is the first one the would require a boost controler like this.

 

With ECUTek or ECUFlash you can adjust those figures so it wont throw CELs at too much partial throttle boost. If you don't have either yet, the HKS EVC6 is capable of adjusting boost in accordance with throttle position & RPMs so you can control your boost within those number to prevent the CELs.

There seems to be more restrictions with the SST transmissions, you can prevent CELs by adjusting those figures on the 5MT (GSR) but you can still get CELs with the SST. The SST vehicles have a "Desired engine load map" based on RPM/Throttle position, if you go beyond those loads, you will throw a CEL. Currently ECUTek can adjust that map but with the current XML files, ECUFlash cannot. I'm sure the testers will find the address of those maps and update us with a new XML file soon

 

No check engine lights been running the current set up for the past 1800 miles no problems what so ever. Just came back from a 350 mile trip and no problems. I went up 1500 feet above sea level with 0 problems so I am willing to say that it works pretty well. Just waiting for a good few days off and I am going to try to get down to Ivey for a tune.

 

the zchip will never be in production.