Used to be a thing called a boost graphic by superchips. What do ya'll think about having extra boost at low RPM (say 21-22 @ 3000 if possible) and tapering off to 18-19 by redline.

 

Sweet, but could we taper the boost to say 20 to redline?

 

I don't think they make it any mnore. I was just curious about the concept. They used to make it to avoid fuel cut on stockish DSM's. like 20 PSI @ 3000 and 15 or so at redline would allow no fuel cut on them with no other alteration of electronics.

 

Thats basically what we already have on this car..

 

I have not seen anyone report their stock EVO VIII had 22 @ 3000 and 18-19 at redline??

 

I meant the boost tapering off.. Ya know, Since I've heard that an upgraded exhaust system could mean more boost.. its possible it could peak at those levels with an aftermarket 3"..

 

Everyone says there is no boost creep in this car, so I still don't understand??

 

The boost falloff is by design.. It maxes at about 18.5 to 19psi, and drops to about 16.5 at redline (it actually drops off very rapidly which leaves a sensation of not having the "Umpf" upstairs)

 

I know all that. What I want to know (or get thoughts on) is about max boost at lower RPM's. Most say 19 is about the limit overall on better pump gas (93ish) due to knock, turbo map, whatever..........?? I realize this limit in the upper RPM's, but what about down lower. Is it possible to run low 20's for boost at 3000 and dial it back to 19 at redline??

 

You certainly can use an electronic boost controller with features that allow you to tailor boost levels by RPM.. Actually doing that would probably be the best bet... The real problem is the "Simple" gadgets to do things like that could possibly do more harm than good.. and the products designed specifically to dynamically adjust boost levels, and reduce boost spikes, etc, can be really expensive..

I actually am considering the same thing using an Electronic boost controller, the jury for me is still out on which product to go with. But for now I'm going with a Manual boost controller and maintaining stable boost across the RPM range.. My main reason for not considering keeping a manual boost controller (and this may change after I work with it for a while) Is the periodic adjustments that you may need to make depending on weather conditions. I definitely prefer the tune and forget features of using electronic controls...

With an EBC, you probably (with good gas) can dial in your boost to peak at about 20-22psi, and taper off at higher rpm's to 19psi fairly easily.. **IF** the stock boost solenoid appears to work with calibrated restrictors to generate its high boost, and low boost settings, then its just a matter of time before someone comes out with a modification for a stock component, or a replacement component that will be so stealthy that even dealers won't notice it..

Someone mentioned that the static boost without the solenoid is a little lower than with the solenoid (in energised and non-energised) I wonder if someone could measure that "Bleed" and then alter them to see if you can calibrate the high/low settings...

 

Anyone have the part # for the boost control solenoid?? I'm more than willing to try this out..

 

I wonder if the boost sol is the same one as 1G DSM's. When the PMS first came out , you were supposed to use that solenoid for complete boost control, but it never did work very well.

 

It looks to be similar or even the same as the 2G DSm..