fcdorifto08

I need confirmation on boost levels on a JDM 12AT.

The motor has been rebuilt and streetported with only 10K. The fuel system and ECU are still the JDM 12AT stock components. However, there is now a FMIC and an upgraded exhaust system.

The current boost is set at the factory 6psi. I heard that since it has a FMIC I can increase the boost to 10psi safely.

Is this true? I've been looking for some expertise and/or confirmation on this.

Thanks for all the help!

FirebirdSlayer666

iTrader: (3)

You'll probably run into issues with the ECU when turning up the boost I.E. the ECU wont send enough fuel for 10psi since factory is 6

680RWHP12A

the problem your going to run into is the 12A turbo motor uses 2 720cc injectors and they @9 psi would me @ 100% duty cycle, wich means you are out of fuel..
stick with stock boost until you add more injectors..

fcdorifto08

So what should I get in order to turn up the boost safely? Standalone ECU and maybe more injectors?

What kind of ECU and injector sizes would you recommend?

yetterben

Your gonna need bigger injectors for sure your maxing them out!!!

680RWHP12A

if you want a little more boost you ould use an fmu with a 10-1 rise. what fel pump are you using?

if you go with a stand alone you can keep the injectors you have for primaries and use 1,000 cc for your secondaries. that way if you upgrade the turbo in the future you will have pleanty of injector
as far as stand alones go i would reccomend either a michrotech or a haltech

fcdorifto08

Ya, I'm looking at the Haltech E6X. Not sure about the fuel pump. I think it's the still the stock GSL-SE pump.

The reason why I asked in the first place is because I read this from the HITman's 12A Turbo set-up site:

"Standard boost level is 6psi. Due to the lack of an intercooler and the standard 2 x 800cc injectors , PLEASE limit yourself to around 9psi. If you push more standard you are certain to blow up the engine. With an intercooler you can just get around 11psi ,but I would consider 10psi a lot safer until you get more fuel into the motor."

Anybody have any input on what HITman is saying?

Jeezus

iTrader: (4)

Basically, if you boost higher than 9 you will blow; no intercooler giving you tons of hear (and might even lose power) plus the injectors running out, causing lean.

fcdorifto08

But I already have a FMIC...

That's where I'm confused, according to HITman, it sounds like I can increase the boost safely to 10psi since I have a FMIC.

yetterben

man if you want to have one good run do it! otherwise listen to rob and others who are saying DONT DO IT!!!!!

djessence

Rob has a ton of exeprience in this, why not listen to him.

As for injectors why go with wimpy 1000cc secondaries, go with something manly like 1600 cc injectors lol that way you youll never have to upgrade injectors

Jeezus

iTrader: (4)

Its not the fact that you have a FMIC, TMIC, SMIC, whatever, its your injectors. Push all the air you want, but with little fuel, expect pinging/detonation/rebuild in the future.

projecktecks

only because you have a IC unit doesnt mean you should always turn up the boost. All intercoolers make you lose some boost, usaually you want to turn it up to offset the boost loss. But, due to your lack of fuel injected to the motor, youre gonna run into issues. so yes, upgrade your injectors and get a walbro.

680RWHP12A

exactly.. thanks guys

when your out of fuel, your out of fuel.. nuff said

it dosnt matter how cool the air is if there is no fuel then your motor goes pop..

oh and they are no 800 cc injectors

they are 720cc injectors, only 2 of them

fcdorifto08

Wow it almost sounds like you're all ganging up on me LOL

I wasn't saying I was going to turn up the boost at all I just wanted confirmation cuz what I read was confusing.

But thanks anyways.

AcidAngel7477

iTrader: (16)

lol...i wanna jdm 12at but i have to settle with a turbo kit for the 12a...

:AA:

notveryhappyjack

iTrader: (4)

its easy

you want more boost.

you need bigger injectors at the very minimum. Upgrade fuel pump and regulator would be smart to.

I have 750 pri and 1000 secnd, at wot I only see 80% injector duty cycle which is perfect if you want your peices to last. On those stock 720 injectors you will be going way to high on the duty cycle and they will burn up fast and the engine will run lean, rebuild time.