How much boost?

[1996Eclipse420a]

I'm wondering on how much power can be made with a 12:1 fmu, FCD, stock injectors? I just ordered JE Pistons 8.8:1 yesterday, along with eagle rods... I plan on ordering ARP head studs early next week, along with a HG. Will I need bigger injectors to make more power? and if so, what size. I guess I should also ask how much power is safe, until MS is needed for a tune.

 

[silvreclips]

I wouldnt go over 6-8psi. Your fuel pressures are already well over 100psi. Leave boost where its at until you get MS or larger injectors

 

[1996Eclipse420a]

could someone link me to the MS product that needs to be bought? I've searched google, and found websites that sale MS stuff, but not exactly sure what's needed.

 

[KYNDL7]

MegaSquirt - Electronic Fuel Injection Computer by Bowling and Grippo ©2010

Booyah!!

 

[1996Eclipse420a]

alright, so ms2 or ms3 will do just fine? I may just order it in the kit, since I'm in Electronic Engineering at college... I have access to all the tools to assemble it.

 

[glowryder]

Just go 20PSI on stockers..
I like how no one ased what turbo your using....
In that case, push to 25.

 

[livedsm4g63]

Just go 20PSI on stockers..
I like how no one ased what turbo your using....
In that case, push to 25.

Id push it to 30. I hear fuel cut is the new fad. Nothing wakes me up better in the morning.



Just get bigger injectors please.

 

[glowryder]

How about.. Just search please... Its been covered about 50 thousand times. Your not doing something new or unique, your resicpe is pretty common, thus you have plenty of info if you wuld actuall search.. You have enuough thought to choose and purchase pistons online, i should hope you can search. We are not here to spoon feed, were here to help when you have atleast done some HW. HW would have told you you can safely run 6 psi on Stock injectors with a 16/20G. Since your going MS, resaerch would have told you, yes, youll want larger injectors. That would aslo introduce more questions, High Z/ Low Z? Board Modification? Seqential, etc.. your on the cusp of getting in deep, get used to to the search function.

 

[99 gs iowa]

around 45psi should be fine, good luck

 

[1996Eclipse420a]

First off, I know the turbo size needs to be listed. I just wanted to know how much power could be produced on stock injectors, until you needed bigger injectors/MS.

20psi on stock? no need to be sarcastic. I said power in the statement anyway, I don't care how many lbs of boost, im concerned about power.

and I'm just wanting somewhere around the range of 320 and 350hp for now.

Just go 20PSI on stockers..
I like how no one ased what turbo your using....
In that case, push to 25.

Nowhere did I ask about lbs of boost. I said power, meaning, is 250-270hp reachable before ms? and I'm wanting to do at least 350hp. so what injectors do you recommend, considering I may want room to bump up the power a little bit over time.

 

[glowryder]

Not possible on stock injectors.

Injectors size needs to be derived from your turbo size..
HP is a sales number, Torque is what moves you...PSI is giving you the power, so you should care about it..Plus your tittle says "Howmuch boost".. Kindof denotes PSI...

Stock, asuming your running a 20G, will limit you to 6 psi ( Can you push it, sure, is it suggested.. no) That will get you 210 ish give or take 10Hp. Given your setup, its hard to "tune" because there no adjustment.. so youll probably over fuel , and thus be less powerfull. So mayb 180-190.

This is bench racing anyway.. If your going MS, why bother with stockers, figure out what your Goal is, what your turbo is capable of, and buy accrdingly. Figure out if you want seqential ( probably not since it will add to the complexity) , then youll know what Impedance to get. Are you going stand alone? or piggyback.. that will also help guide you to a good decision..

MS+20g id say 550s or 6XX's That should give you enuff head room to use the turbos Effiancancy .

what are your trans and suspension mods? If your not LSD, i wouldnt bother with anything over 12 Psi.. 3rd may handle it but, youll just blow the tires off 1st 2nd and some of 3rd..Unless its a dyno queen , then carry on.

 

[1996Eclipse420a]

Thanks for the reply, and sorry for the late reply.

also, going standalone.

also, I planned on a 16g. Another question I have is a certain MS recommended over another? Like MS, MS2, or MS3? I'm sure MS3 has improved by leaps and bounds, but would MS or MS2 be just as efficient?

as for my transmission mods.... pretty much stock, besides buying one recently and having it rebuilt, because my old one that I took out locked up when I put it back together, and nobody apparently knew what was wrong... but that's how it is around here. I don't trust anyone to do work on my car, so I basically do it myself, unless it's something I'm not comfortable with. Then I send it to somebody out of town. If a LSD is highly recommended then ill invest in it.

Struts, and springs are stock. Recently bought axles, lower ball joints, and tyrods, that's about it.

Thanks for the help so far. It's easier when someone gives you all the info at once.

 

[glowryder]

At a min MS2... MS1 is dead. MS2 or MS2 extra is what youll runn for standalone.

MS3 is the best

As for LSD, id deff recomend it, it wil help you use the power vs. loosing it thru spin..
Id upgrade the motor mounts, and the suspension, as you dont want to loose power thru there either.

 

[turboglenn]

MEgasquirt, 50 trim, FMIC , custom piping and exhaust, 720 or bigger injectors (1000's are a nice balance for both E85 and pump), built engine as you descrive, ARB studs and good gasket for the head (hell felpro composite is what i run on 4g63 with 30+ psi) but anyway, get those and your boost is limited by the tune and what your engine will allow you to push, every engine is different and as others have said, "Searching woulf have saved you a lot of time" also when you make your thread title the forum automatically lists other threads that have similar topics to suggest you look there before posting,
When i need to know soimething i can't find easily in search i put a title in to starting a new thread and read the suggestions in other tabs, after that i rarely need to post.

The above combo is the cheapest and best route i've seen for a fast 420a powered car anbd i've built a few, i just rarely use MSnS because i'm a haltech dealer

 

[1996Eclipse420a]

alright, thanks guys! I plan on getting the FMIC and everything after I get the rods and pistons put in. Thanks for the suggestions on the injectors.

One last thing... Could I use a FPR, to help control the fuel pressure? considering if I did just use a 12:1 FMU to start with. If fuel pressure is going to be 100psi or more, then wouldn't it make sense to regulate the fuel pressure?

Either way, I'll definitely be getting MS in the near future.

 

[glowryder]

You will use a 1:1 FPR.

 

[grothe3297venge]

You will use a 1:1 FPR.

Not with a 12:1 FMU..At least I have never heard of using one with an FMU.

 

[turboglenn]

I would ONLY use an Adjustable fuel pressure regulator, especially with a stand alone, the FMU's are the worst band aid method to make up for not having the proper management to begin with, Just get the aeromotive or what ever import evolution has on sale (i got the aero unit and a fuel lab 818 filter to rail -6 kit with an extra SS element that i can clean and resuse since i run ethanol)

When At all possible stay away from an FMU, those and a few other band-aid boost solutions are a lot of the reason boosted 420a engines get such a bad rap for blowing up (assuming that the head gasket issue of the short tapped hole has been adressed)

Best of luck, get the build going and post up for us to ride along

 

[glowryder]

Ypu will use a 1:1 fpr. Most running standalone.. including myself. Are running a 1:1 fpr.. not sure why you would use anything else..no one said use both.. i didnt think that needed to b spelled out..

 

[grothe3297venge]

He don't have the stand alone yet, hence why he needs the FMU, and can't use the 1:1 regulator. the 1:1 fpr won't work until you have a piggyback or standalone MS or portfueler to correctly compensate fuel.

Ypu will use a 1:1 fpr. Most running standalone.. including myself. Are running a 1:1 fpr.. not sure why you would use anything else..no one said use both.. i didnt think that needed to b spelled out..

Ok I knew you would with a standalone, he was asking with an FMU, was just a little confused sorry.

 

[glowryder]

Yea, but he already has a 12:1 setup.. why would we bother talking about it if its already in? Idk maybe im lost.

 

[grothe3297venge]

I know he has that setup, he asked if he could use a FPR with a 12:1 FMU, which he cant, and you said he could use a 1:1 which kind of threw me off. That or maybe I'm just off my rocker today

 

[boosted99_420]

megasquirt is a must on the 420 but on stock injectors i wouldnt go past 10psi. up the injectors to like 660cc snf go up to 20 psi and have fun keeping pace with us 4g63 FWD guys

 

[grothe3297venge]

megasquirt is a must on the 420 but on stock injectors i wouldnt go past 10psi. up the injectors to like 660cc snf go up to 20 psi and have fun keeping pace with us 4g63 FWD guys

!! Way to post useless info to the OP (other then the MS is a must)!

 

[glowryder]

Lol.. OP- i think we answered your questions. Stock injectors are good for 6psia (safely).
To go ms like you plan, youll need a 1:1 only, and 550-1000ccthe depending on goals, trbo amd fuel.
Your goal of anything past 215hp isnt obtainable on stock injectors. Or in other words, you wont hit 300 like you want. Thread closed now?