I am not trying to flame, just want to ask a question. Here you say testing has shown some boost taper, especially in 3rd, but then you argue it will hit 20 and stay there just a few posts later. Which is it?

 

^^^^ Not quite sure what your problem is but both quotes above say exactly the same thing.

 

No, that is not what he is saying. Al says in the 2nd quote that a normal evo will taper 1.5 to 2psi as you reach redline, but his new flash will not taper. In the first quote he admits the new flash tapers in 3rd gear, but not as much in 4th and 5th. Which is it?

 

Read these posts for your answer.
Quote:
Originally Posted by nebolic
questio? If the boost is set and controlled by the ECU how come it still tapers? Just curious cause if the ECU is controlling the boost and you tell it to boost 20psi, shouldn't it technically stay at 20psi without tapering since the ECU is wanting it to boost 20psi?

Nebo

Quote:
Originally Posted by Dynoflash
Even with MBC all evos taper boost slightly on top due to the fact that the stock turbo has a hard time holding high boost to red line

 

How Much Whp Will A Stock 03 Evo With A Mail In Flash And That Ecu Boost Controller Give You?

 

An MBC opens the waste-gate at a set pressure point, regardless of rpm. As rpm rise, there are inefficiencies in your boost system that become more noticeable, so your boost pressure drops, even though the MBC still sees the exact same pressure as before. That's why an MBC still tapers as much as 2 psi.

Only an EBC can compensate for this dynamic behaviour by emulating an MBC with a spring that becomes "stiffer" as the rpms climb, so the boost curve is truly flat. An EBC is nothing but a computer connected to an electronically actuated boost solenoid.

From the factory setup, your ECU acts as the EBC controlling the stock boost solenoid. It adjust the "spring stiffness" of the solenoid based on such factors as gas quality, weather conditions (colder air is denser), and rpm levels.

Ideally, if you can fully control the software logic in the ECU code that controls the boost solenoid, you can not only change the peak value of the boost curve, but also its shape to anything you want - taper, rise, flat, whatever.

As a result one key advantage of an EBC vs. an MBC is that you can set boost to build faster (keeping the solenoid fully closed at low rpm), without getting massive boost spikes at mid rpm, and no taper at high rpm. Typical EBC curves show a slight "overshoot" in the beginning, and then become flat about 0.5 psi lower than the peak through the remaining rpm band, all the way to redline.

 

The reflash adjustment on the MR allows the boost to hit the same peak but hld it much longer instead of falling down right away - its actually very nice on a totally stock MR

 

Sorry Al, don't mean to come off sounding like a dick. It is just that you have said two different things and I am obviously confused, hence why I am asking for clarification from you.

I am not a tuner, I don't pretend to be one and I never will be one. But I am a consumer, and as a consumer I would love to be informed about the details inherent in your products. I just want to know if you have control or CONTROL and changing out a boost pill would imply that you just have (lower cased) control.

 

I will explain it all to you in a week or two when i roll out the entire product line which will provide multiple boost pill configurations - fully mapped boost control and customized through the mail reflashes for $199 including the revised boost pill and installation instructions.

 

In order to help understand the boost control on the EVO, I would like to show you what the map looks like.

Could any of you capable of hosting pictures contact me via e-mail and I will send you screen shots of the Boost control maps.

ben@ecutek.com

Cheers !

Ben
EcuTeK North America

 

The ECU can control boost?

 

Here are the maps Ben sent - and the comments:

 

Ben - thanks for the data! With access to these types of parameters, can you control the boost curve shape (e.g. taper) by simply changing the desired boost map points?

 

I would have to try and see, I prefer to give a little less boost on top end to release stress on the engine. That causes "some" HP loss but I would rather be safe...



It is also very depending on the exhaust fitted on the car, cated or not, muffler configuration (baffle), collector,...



You can see that on the desired boost map there is a taper originally, it could be possible that the turbo (physically) might not be capable to hold that boost at high RPMs.

BTW, thanks for posting the pics Void!

Hope this clarify a bit more,

Cheers !

Ben
EcuTeK North America

 

Al, I figure, after is all said and done (mechanically) Im just gonna bring my car to you with a blank check and let you go silly. That is too much