..run it.

 

i have the hallman manual boost controller installed, along with the ecutek tune. been running fine since day 1, set at 23 psi

 

The X is slightly different from the earlier evos now ..

an MBC will cause a CEL at part throttle due to disagreement between the airflow and your TPS .. OR it will cause an overboost CEL at part throttle ..

Z chip messes with the airflow .. and this ECU calculates almost everything with the airflow signal .. here are some that uses airflow ..

ASC
SST
TPS vs TB
Boost

So if your CEL comes on .. it will be anyone of this issues ..
The ECU is no longer piggyback friendly ..

 

i have a perrin, and the ecu learned itself and made its own corrections, but a tune will correct any problems found with aftermarket parts

 

..

 

edit

 

Oh gawd, sounds like you are speaking for every single X owner here running an mbc... you're so sure of yourself.

Listen, it will not necessarily cause these problems, I did indeed have these problems when I first threw mine in, but it was the combination of the mbc and an aftermarket bov, if you run the stock bov with a mbc you will almost definitely not get this problem... now if you do, for whatever reason, ecutek software has the ability to adjust the limit value on your boost tables to eliminate this problem.

I run 25 psi with a hallman and don't have any problems, period.

Z chip, in my own opinion, is a glorified S-AFC and is junk, I wouldn't use it.

 

That might either be boost and/or fuel cut, not sure but you might want to try turning down the boost... how much boost are you running?

 

What he said is true, if you know how to read ECU maps you would know too. He's not just speaking out of assumption, it's real information within the ECU. If you don't trust us, go to my thread and grab the XML files for the USDM EvoX. Download ECUFlash and grab the hex from openecu.org and take a look at the maps that limit boost.

So far we have found that just about every MAP is linked with the MAF in some way or another. If the readings are off by a certain limit or time, it WILL throw a CEL.

 

+1 Tune + MBC.

But yeah MBC alone gives you good power so definitely install it and set it at stock boost levels like 23-24 peak.

 

Seriously .. I don't know if I should answer this .. short of sounding 'high and mighty' .. but if you think I'm wrong .. I'm fine with this .. I don't lose out .. but do remember not to ask me next time how certain aspect of the ECU works .. I' may be too sure of myself

 

Original USDM map seem to be spike to 22psi and tapering to 12-13 psi ..

Now if you set the peak to maintain 22 psi .. then the spike will be be probably 25-26 psi .. maybe higher ..

4-5psi translate to approximate 20-30 load difference .. under certain conditions you may exceed the part throttle boost threshold ..

If you're in CA .. look for bryan from GST .. he's with me in the testing and development of ECU reflash .. he'll make your car fast without the MBC .. heck stock EVEN .. hehe .. his nick here is Razorlab I think

 

Sorry for partially jacking this thread but let me try to explain the simple things about how raising the boost with an EBC or MBC will affect your ECU readings.

Here are some basic MAPs from the stock USDM EvoX


Boost Cut Delay Timer
Boost Limit
IGN Timing (Hi)
AFR (Hi)

Lets say that at 3500 RPM WOT (3rd gear) your stock Evo hits 23 psi and at 7000 RPM it falls to 15 psi. The loads you'll hit should be around 240-250 at 3500 RPM and 220-230 @ 7000 RPM. When you install a boost controller and increase boost you'll be hitting higher load cells. What does this mean?? Take a look at the AFR map, at 7000 RPM/220 load your target AFR is 9.2. If your load increases your AFR would get richer and richer. This applies to the IGN timing too, as load increases, your IGN timing will decrease.

Now look at the Boost Limit map. Left numbers are RPM and right numbers are loads. What this means is that if your load goes beyond what's listed on the map, you'll hit the boost limit and more than likely throw a CEL.

Now look at the Boost Cut Delay Timer, it says 1000ms, which is 1 second. The ECU lets your car go beyond the Boost Limit map for 1 second so even if your car spikes to 27 psi for less than a second, it wont throw a CEL. So you may hear about people that don't get CELs at 27 psi without a tune but this is more than likely just a sudden spike in boost. If it holds the boost for more than 1 second, it'll throw a CEL.

Increasing your boost without a tune may increase a little power but not by much, this is because your car will run pig rich and decrease the IGN timing. Alot of people have problems with their cars sputtering at high RPMs after installing a MBC or just an exhaust (exhaust increases boost), this is because the ECU is made to run "bad" at high boost to protect the engine.

MBCs or EBCs aren't bad, it's just that you wont get the full potential unless you get a tune.

Again, sorry for jacking

 

man so I basically doooo need a tune with a mbc
was hoping to avoid it haha.


so even if its something as small as 22-23 psi guessin you still recommend tune correct?

 

I didn't say you were wrong... just not completely right. You said that it WILL cause a cell at part throttle, that is what I was pin pointing... see what I am saying? I am not questioning your intelligence, I am just here to tell you that I no longer experience these problems and I have an mbc, but by your statement, that is impossible.