busa4

its damn near impossible to figure that out. its a trial an error method as all engines require different fueling characteristics at different rpms and throttle position. if you search ebay for fmu there should be some on there that come with different ratios all in one package so you can decrease the ratio to dial it in. always start with the richest ratio and work your way down in ratio(leaner) till you get that 11.5 - 12.0 :1 afr. these will require a high flow pump as your stock pump will burn itself out pretty quickly running very high fuel pressure and it also will flow less volume at high pressure which is not good.

nickrocks

so maybee i should turn the boost down to 6psi. the factore set the wastegate at 7-8psi so i may have to research how to change that.

at 6psi boost and useing an vortech 10:1 fmu with a airtex e2000 pump.

e2000 pump is rated at 95 psi and 40 gph.

this setup with the boost lowered to 6psi should be a safer setup than maxing out all the componets.

before i order the vortech 10:1 fmu (id be able to buy adjustable pressure plates from 4:1, 6:1, 8:1, 12:1) but 10:1 seems like the best starting point.

an airtex e2000 pump.

is there anything else i should consider before spending the cash on this stuff?

id also like to do the msd btu but for now id like to think this will at least get me running without worrying about blowing it up.

nickrocks

well after talking with a friend who has some knowledge of turbos he suggested
useing a begi brand fmu.
i guess its compleatly adjustable and is good for up to a 120 psi system.

its not much more than the price of a vortech so i guess i should go this route instead.

busa4

the adjustable ones are convenient but from my experience they fail often.

nickrocks

well i need to get a plan here and the more i read the more im up in the air.
reading on another forum there a guy saying that useing ms i could wire it and be up and running in half a day.

ive sent him my number and asked him to call me but no answers yet. by the time i buy a fmu and new pump and a btu id be spending even more than the ms.

ive tried leaving my number with diyautotune.com but still havent heared back from them yet.

as i understand it it somewhat easy to do but im not much of a wiring person.

busa4

megasquirt would be a great choice. most affordable standalone on the market. it also has a built in 2.5bar map sensor for boosted applications.

im currently using the microsquirt for a motorcycle application and cant wait to get it wired up and running.

fasteddi

+1 for the MS in your situation. Personally I would't want 120psi of fuel going through my fuel lines, but my car is old.

A friend of mine showed me how to set up MS and its really easy. I was there for the install, took 3 hours then started up the car and started tuning. He was really good with a soldering iron though as the kit he got, we had to piece together.

If you can get a tested assembled one to ease your mind if you assembled the ecm right. Cost about 100 bucks IIRC.. more but If it was me, thats the route Id go.

nickrocks

theres no kit for the engine im useing so basically buying seperate parts that would all come together and make it work would be my only route at this point.

id be interested in useing the ms and the price dosent sound to bad but that leaves me wondering how to get all the right parts and what to do when i get them all.

ive sent email to diyautotune.com and tried to get ahold of megasquirt but still no call back from either.

peaple say its pretty easy but im at a loss for where to start. hopefully they will get in touch with me soon. another weekend will come and go and ill still have made zero progress.

busa4

the kit he was referring to was the megasquirt. you can purchase a megasquirt assembled for ~350.00 or you can buy it in a kit for were you put it together by soldering all the components to the motherboard for ~150.00.

Matt Cramer

I think I tried calling you earlier but I seem to have called at the wrong time. I've emailed you a list of questions about the build. I'll also send you a number to call.