I just want to make sure, if I purchase the XEDE, will I not need a boost controller to control boost ? The XEDE can control and raise boost right ? Thanks!

 

You bet it can at any RPM loadpoint you want. In fact youd need a meglo expensive >~$800.00 controller to equal it!

 

It can control boost, but only to a certain extent. I think the Xede can only do like 22 or 23lbs max, which is more then we should run anyways. So for all intents and purposes it controls boost perfectly.

 

If you need to run more boost for some odd reason, you can do so by inserting a smaller diameter restrictor in the boost line that goes between the compressor outlet on the turbo to the "T". This will increase the effective bleed of the factory boost control solenoid, resulting in a higher max boost level. At 7000rpm, however, you'll still be limited to around 17psi due to turbo flow limitations.

Cheers
shiv

 

Can this feature be adapted to an aftermarket turbo?

Check out alddave's comments:

https://www.evolutionm.net/forums/sh...&pagenumber=11

 

Absolutely. In my own Stg 2 car, the XEDE controls boost on the GT3037 all the way up to 35psi Boost response is immediate and virtually flat with no spiking, oscillation, etc,.

Shiv

 

Someone needs to help alddave out as to how to accomplish this.

 

Whoever installed the new turbo set up should have known how. It's basic wastegate control theory. To make more boost, you need more wastegate signal bleed from the boost control solenoid. But if the solenoid is already running at 100%, you need to restrict the raw wastegate pressure signal so that the solenoid bleeds a larger portion of the (now smaller) signal. This will make boost go up. My guess is that there is no restrictor in alldave's wastegate plumbing. This is a common mistake. I'll drop him a PM and reference him to this thread

Cheers
shiv

 

...Install a MBC in the line between the Turbo outlet and the respective inlet of the factory "T", without even touching the brass-restrictor pill on the factory boost-control solenoid.

In this way you can perform global adjustments of boos pressure via the MBC, and "local"/finer adjustments with the XEDE, while calibrating for maximum output in high RPMs. Also, the "scale" or granularity of PSI increments/decrements resulting from Xede operation is dramatically enhanced, due to the MBC control, plus virtuall all spikes dissapear (!?).

You easily reach 19psi in third gear, at 7000 with this setup. Works like a charm.

Happy racing!

 

Awesome. Thanks everyone for the awesome response and info! Now I have a big question!

My engine is relatively stock now except for samco intercooler and radiator hoses, Ralliart Cool thermostat, a grounding kit and an HKS super filter. Recently, I've noticed the car's RPM's jump about 800 rpms and back down roughly 200 or less then keep climbing, when dropping the pedal at the higher gears (4th and 5th) below 3k. This happens just around 3k when it gets there...
The dealer mechanic said its most likely the turbo overboosting slightly (since it is starting to free itself up.. break in etc... and the IC hoses), ECU compensating by backing it off, and then it keeps climbing. If this is the case, with a relatively stock evo engine paired with an XEDE, can I set the boost to stay at 20psi all the way to the redline ? Without overboosting or spiking etc.. ?

When installing the XEDE by itself, do you remove the brass restrictor pill ?

I'm very interested in the XEDE and just trying to get some info! THanks!

oh yea, i have 11,800miles on my evo

 

Why do so many people report "running 20lbs of boost to redline"? Can you elaborate a little bit? Is that due to overall ps output? 300 hp vs 380, as the 380 hp requires more cfm, hence less overall boost @ 7k.

 

Alot of people are just flat wrong due to boost gauge inaccuraceis, but machine tollerances and more favorable weather conditions could play a part. But you are right on the amount of Flow required especially as the VE of the engine is increased (Shiv also uses cam gears wich do add significantly to the top end and affect a "psi target" some ar trying for) Cams do the same