I'm about to install a Hallman MBC on my stock 03 EVO is this ok since i have nothing else done to the car yet? Will it still make an improvement? And what shoudl i set the boost levals too? Also i do have a boost gauge.. Next mods in line over the next week or so with be AEM EMS w/Wide band o2 & 3.5 Map sensor (installed and tuned by Turbo Trix), Ultimate Racing 3in Turbo back w/o cat, Dejon pipe with Airfilter since i have no MAF, 255lb Walbro pump.

 

If you're doing the intake next week, just wait. You'll have to take the stk intake snorkel out for the mbc install anyway. It's a bit of a pain in the a$$. Just let TT do it during next weeks install.

Otherwise, yes you will feel power gains if you do install it. You can set it to spike to 21psi and it will probably settle to 19psi at redline, instead of 16psi (without a MBC). You will feel the car faster with the 3 psi difference at redline. Rule of thumb is 10hp per 1psi.

 

you should get your ecu flashed or a piggyback cuz you may go lean in the upper end... but yeah right off the match 20whp gain is possible because your boost will no longer tapper or much less

 

As rich as the top end is I'll doubt he'll go so lean as to cause problems as long as he sticks to 19 psi.

 

it has nothing to do with running lean... he will have so much detination past 5000 he could damage the motor... Add some octane if you plan on raising your boost, you'll want something around 94 octane if your running around 19/20 psi

PS yes it will make a difference on a stock evo, it will make a bigger difference with a modded one but the car won't fall on its face after 5500 like it feels stock and atleast a catback with the MBC if you want to feel some major power gains

 

While looking at the docs that come with the hallman MBC, they all say you are *REQUIRED* to install a high performance exhaust prior to MBC install. The EVO exhaust is prolly better then most for stock, but not outstanding.

Anyone have a reason why I should not do a MBC with stock exhaust.

 

You might just aswell do all of the installs at once so then you dont have to keep taking things off to install new things.

 

The only reason they "require" an exhaust already be installed is because when you put the exhaust on later, your boost will spike/be higher and they don't want to be responsible if you neglect to turn the boost controller down to compensate.

 

Kinda wondered about that.

Thanks

 

Interesting read... Once I get my evo I'll through in my nsn MBC and raise the level to 18-19. This MBC has very minimal boost spike (I've seen none to date actually) so it shoudl be safe.

But in the 2004 model is it almost impossible to install the mbc with the intake in the way?

Luckily I have a few spare boost gauges laying around for setting the boost.

 

The 2004 is no different from the 2003. What are you talking about? You have to take the intake out to install a MBC.

 

YOu will hurt nothing by installing a boost controller and setting it at 20psi. The ecu is pig rich after 4500rpm's and even by raising boost you will still be very rich. The factory fuel pressure regulator is a rising rate type that will increase pressure as boost goes up. You will still need to remove fuel after raising boost to 20-21 psi.

Gil-superz

 

That was the remark that lead me to beleive it'd be easier to install the mbc without theintake in the way.

 

Understood... I ran a RRFPR for 2 years and just recently went to an engine management system. It only let me control the analog fuel and timing, but it is a great system. I plan on going EMS with the evo.

 

maybe you guys can tell me if im wrong but i heard a rumor from a birdie that said with a boost controller, every 1 psi you turn it up it gives you about a 5 hp gain... i dont know about you guys but when i put my boost gauge in and with stock boost i was peaking at 17 or so and then tappering down to about 15 to 16. Put the boost controller in turned it up to 20.5 after my ecu flash, no taper, and car pulls a hell of a lot more....