I am just wondering, if you get an Electronic boost controler, one like the apexi AVC-R that can do the scramble in gear thing. It says it removes taper, im just wondering how well that works out, anybody try it? Also what about that AEM Tru Boost gauge/EBC in 1?

 

when you raise the boost above stock levels on the stock evo turbo(on the VIII at least), the compressor is simply too small to keep up the flow to redline.

 

not really, there were guys reaching 22 psi at redline on the stock turbo.

 

and on that control boost with stock boost control solenoid, somebody set it up that their boost actually goes up as their RPM goes up so when they hit redline they are at like 23 psi.

 

yeah, it's possible to hit 22 at redline after spiking to 24-25 at peak torque, but if your looking to run 22 psi from 3500 to redline it's not going to happen with a stock 8 turbo. mine still has a slight taper from around 22 to about 20 running a hallman MBC. if you can get factual data that says i won't get this switching to an EBC let me know as i'll definitely switch over.

 

I had a Greddy E-01 controller. It supposedly could do boost by rpm, but you could only do it in 'Auto' mode (closed loop). But to enable auto mode, you had to go through this fuzzy learning process. I tried a dozen times, but the darn thing would never learn right, thus I couldn't use that feature. Every other Evo owner I PM'd here said they couldn't get Auto mode to work right either. I gave up and sold it.

Screw the EBCs. I'm switching from MBC back to the stock solenoid as soon as I get a free weekend to play with the cals.

 

ebc's rule

 

That sounds like minor case of boost creep to me.

 

No somebody actually set it up, based on desired load, and wastegate duty cycles. for their peak psi to be at like redline.

 

I've been using the Apexi AVC-R for a few years now.. It really has features that nothing else out there has.. Honestly though, I'm not sure how many of the features most of us really use..

 

Interesting. Sounds like a nice feature.

 

I ran the original Greddy Profec-B (not the spec II) in my Eclipse and it was an excellent EBC. I remember picking that one because of reviews in a magazine that tested EBCs and their ability to hold boost, eas of use, etc. The fuzzy logic controllers, at least back then, never worked very well. The Profec-B was very easy to use and controlled boost very well. It also had two boost settings.

I am about to install the Greddy Type-S EBC on my Evo within the next few days, probably this weekend. The Type-S is just basically a re-release of the original Profec-B, with a better solenoid, etc, to be able to hold up to 43 psi. They basically re-released the original Profec-B because of the simple fact that it performed better than their fuzzy logic controllers and it was simple to use and setup.

I have a GM 3.3 Bar Map Sensor installed, too, so maybe I will do a few logs with stock boost control and a few logs with the Type-S installed to see how well it can hold boost to redline.


Eric

 

What are you using to log the GM Map sensor?

 

Currently I use the Innovate SSi4 and Logworks. Once I get enough data, I will send it off to Jack or Evo4Mad so it can be logged in the EvoScan or MitsuLogger.


Eric

 

OK, I said that I would post before and after logs of boost using the stock solenoid (no tuning) and then the Type-S, to see how well I could get the Type-S to hold boost to redline.

I should probably wait until I have both graphs, but I figured I would post the 'before' graph now. I was planning on setting up the EBC right now, but it looks like I'm off to something else today...

This is a stock car with just 3" TBE with hi-flow cat (not even tuned yet...yes, I haven't even had time to do that yet). This is a third gear pull logging boost and AFR. Hopefully, by tomorrow I will have the 'after' graph. I wonder how much the stock actuator and/or stock BOV will limit my ability to hold boost. Guess we'll see.


Eric