running lean.

se7en · Post by **se7en** » December 13th, 2007, 1:42 pm

I am running lean.

I am wondering what I can do to fix that.

I have FMU installed, and I am still waiting on my millenia S injectors to get here.

at cruise(part throttle, I am at 11.8-12.2:1 which is great, and at idle, I am at stoich(14.7:1)

but as soon as boost comes on, it goes lean(like way lean, and off the gauge.

I am wondering, Do think the millenia S injectors will fix this? could my stock injectors just be sh!tty?

without the fmu, I can't boost over 1 psi before it goes lean.

now I am at about 2-3psi, and still lean there.

I am hopeing thast the millenia S inj. will let me boost to 7-9psi.

what do you think???

will the millenia S 's fix my prob or what?

thanks

7

EDIT : it is the worst in first and gear.
third gear will pull about 13:1 until 3-4psi, then go way too lean.
and forth gear is not bad until about 5psi.

geez, I can't wait until my injectors get here. I hope that fixes my problem.

XxantwawnxX · Post by **XxantwawnxX** » December 13th, 2007, 2:29 pm

the fmu might be overloading the small injectors...cause them to go static. wait it out man to u get soem bigger ones. or ditch the FagManagmentUnit.

MX3ak · Post by **MX3ak** » December 14th, 2007, 7:14 pm

Fuel pressure regulator should give ya litle more juice

Limegreen mx-3 · Post by **Limegreen mx-3** » December 14th, 2007, 7:42 pm

XxantwawnxX wrote: ditch the FagManagmentUnit.

i couldn't say it in any better way

because thats what they are POS FMU

im not dissing u se7en im dissing the fmu

se7en · Post by **se7en** » December 14th, 2007, 10:01 pm

I know, I know, but I just needed something to raise my fuel pressure for the time being.

I am msns soon so then I won't have to worry.

7

K8Boosted · Post by **K8Boosted** » December 15th, 2007, 12:13 am

i ran 220cc injectors with a high pressure fuel pump on my k8 and it was as close to perfect as u can get with no managment at all...

se7en · Post by **se7en** » December 15th, 2007, 12:21 am

what psi where you using when it was perfect?

RbluE_MX-6 · Post by **RbluE_MX-6** » December 15th, 2007, 5:44 pm

se7en wrote: I am msns soon so then I won't have to worry.

7

With ms all you'll need is some bigger injectors. What are your power goals? How much boost you plan on running? That'll help in determining your injector size. Still millenia s injectors are good for *some* boost.

How much did the millenia injectors cost?

se7en · Post by **se7en** » December 15th, 2007, 8:27 pm

I got them for about $140 canadian shipped.

I will only be boosting to about 10psi when I get them in the mail.

I will be keeping a close eye on the Air/fuel ratio when I do get them.

also, being that it is winter right noe, I can get away with 10psi for now.

in summer I will be only 7psi probably, unless I have race fuel and I am at the track

7

ps, how much boost are the millenia S injectors good for in the k8 do you all think?

I'd like to push over 200whp with this motor for now until it goes pop!

MazdaManiacMx3 · Post by **MazdaManiacMx3** » December 18th, 2007, 9:40 pm

All you should really need is KLDE injectors , bigger than k8 but not overkill like the millenia S's will be
Kris