I purchased the car from a seller with an electronic boost control on the car, but I been watching it and it sure spikes really high and tapers down when you get on it (22-23 psi) on 91 oct. Little to high to me, but I want to convert it to a mbc and get rid of the ebc, so the question is are there going to be any negative consequence for doing this. I am looking to cut down the boost to 20-21 with a taper of 20. Let me know what you guy think. Btw the ebc is solder in to the wiring harness and is missing the brown plug for the oem boost solenoid

 

So, let me get this straight is it tapering down to 22-23? So,how high is it peaking at? How many PSI is it tapering?

 

If you think about what you wrote above it doesn't make much sense actually.

 

Actually, for a stock IX turbo, tapering to 23 PSI is not bad at all. Maybe this has something to do with the EBC. But, I wouldn't know about that. These IX turbos usually taper down to 19ish. Maybe yours is ported though.

 

Since you state that you are going to ditch the EBC for a MBC, I'll tell you what I would do before even installing your new MBC. Disconnect the EBC completely. Sell it in the classifieds.

Then I would set the WGA spring pressure to 18 PSI. After you've done that then I would install the new MBC and adjust the boost up from the 18 PSI spring pressure level to your peak of 21-23 PSI.

 

OK guys basically the answer I am looking for is.. if I get rid of the ebc and go to a mbc is there going to be any ill effects. 23 Psi is to much on 91 Oct in AZ..

 

No ill effects. In general a MBC is just easier to use. Also, initial setup is more straightforward on an MBC.

 

thanks for your replies... just dont wanna have a detonated 2.3 stroke motor from too much boost and knock.. Will see what happen Sat when I put my new mbc on.

 

well apparently, you can not just change out the ebc to an mbc without retuning it.

 

You should definitely get your car retuned whether or not you switch the type of boost controller. Do you have a wideband A/F ratio gauge installed on your Evo? If not, then do so. This way you can monitor and log A/F ratios.

I don't necessarily agree with the statement that you can't just change out the EBC for a MBC without a retune. In your particular case, your current EBC setup is not controlling boost where you want it to be anyway. It is over boosting. So, by installing a MBC and turning the boost level down to where you want it, you would be lowering boost to a safer level.

 

why dont you try an electronic boost control solenoid? and get it tuned by a pro

 

sdasdasdf saf grrrrrrrrrrrrrr
stupid browser lost my 50 lines MBC vas EBC comparison nooooooooooooooooooooooooooo
sorry I'm not doing it again so I'll make this quick

I seriously doubt you'll have 20psi@redline with a MBC because I have GSC s1,fpgreen73hta,18psiactuator (which is more at like 15) and the hallman pro rx tapers from 23.8@3500 to 19.43psi@7800 which is disappointing :/
For me not only do you need a strong actuator spring but you need to set-it-up really stiff to use a MBC if you hope to have some boost at redline.

The EBC on the otherside doesn't really need to have you change/tune the actuator (I could get 26psi at redline if i wanted to with the same setup that gives me a poor 19.4 with the MBC)

Switching from my avc-r to the pro rx I lost 20hp dynojet thx the boost going down @redline with the MBC. (400hp instead of my previous 420)

The MBC only advantage is between 2000 and 3500rpm on my car, it's is insanely quicker to respond than an EBC as soon as I press the pedal boost is up to 7psi and if I press slightly more it's 14psi while with the avc-r all I get for pushing slightly the pedal is 0psi and eventually it's gonna climb to 7slow down a bit and then go up to 14 if I keep pushing.

This said I'm gonna keep the MBC at least for a while because i'ts a daily car and redline power is kinda useless to me, the insta-boost and insanely fast overtaking the MBC allow are not.
The Hallman Pro RX is gonna make you smile everytime you accelerate while the EBC will give you more dyno hp and better 1/4mile acceleration, it's a question of what you want to do with your car.

p.s.
EBC have ways to tweak boost and make it more even on each gear while the MBC on lower gears you don't have much boost..that's also a problem
for 23ps in 4th I have seen 19.6psi in 2nd to give you and idea and once in 6th I had almost 25psi

to get from 0 to 23psi starting from 2000rpm the MBC spool advantage is 0,7s on my car
i'ts only 0,25s if I start from 4000rpm
and it's down to 0,125s if I start from 5000rpm
also on virtual dyno runs MBC advantage is seen only from 2000rpm up to 3500rpm after that EBC and MBC lines cross and the EBC curve becomes better as revs go higher

edit:
I used defi boost gauge, the still connected avcr display, evoscan, wideband, video analysis etc...to end up with these results