Hi, I'm looking for information regarding the weakest components on a stock 97 turbo eclipse.We need to know the right amount of fuel/intake mods needed to maximize performance according to what the mass air flow sensor is desinged to measure. How much horse power will it measure? Is the fuel pump the weakest componet or is it the regulator or fuel rail? What is the right mods needed for the proper air/fuel ratio for the mass air flow senser to be maxed out?
For example why modify the fuel system completly if there's insufficiant air intake for it to handle or vise-versa. This will only lead to piston detonation! So I am open to any and all eduacated decisions.

As far as I know, people who run the stock ECU have be able to run it fine as long as you upgrade the fuel components...

You can do the fuel pump rewire, to make it run 14.4v to squeeze more out of your current fuel pump, or get a walbro 255, or supra fuel pump.

Also, if you are serious about HP, get DSM Link or something more serious so you don't have to run a MAF.

This is mostly a non turbo site, I will move this to the 4g63 section where it should have been posted in the first place.

In terms of fuel, generally the fuel pump is the weakest link, followed close by injectors. A fuel pump rewire, and an upgrade (190, or 250+Aftermarket Fuel Pressure Regulator) would take care of that. Fuel injectors are ussually next but would either need to be accompanied by a datalogger and S-AFC, or DSMLink. A new fuel rail is ussually reserved for extremely high horsepower applications.

In terms of horsepower you see. That depends on WAY too many variables to ever calculate accuractely.

1991 Mitsubishi Eclipse GSX - SOLD
2006 Mustang GT Convertible

did anyone mention replacing the turbo?


www.vfaq.com for tons of info on turbo DSMs.

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior

If you are going to use the stock MAF you are not going to be able to achieve more than 500hp. That is what it is rated at because that is all the air it can flow.

To achieve that you will need.

Fuel pump - Walbro 255HP
Injectors - Probably 880's to get that high
Wideband O2 sensor
SAFC & Datalogger or DSMlink for injector tuning
Bigger turbo - Probably 50 trim or bigger
New Intake Pipe
Front Mount Intercooler
Hard Piping for the intercooler
Upgraded BOV
Fuel Pressure Regulator
Boost Controller
Wastegate (if turbo is not internally gated)
3" Exhaust - Turbo Back

Those components along with a lot of tuning time or dyno time will get you near the 500hp mark if your stock engine doesn't break.

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blah, blah, blah. Fuel has really nothing to do with it. It's AIRFLOW! You could throw in a set of 1500cc injectors and the biggest fp made. Until you have a turbo capable of pulling more air through the stock maf than it can handle, that's when you have to upgrade to a blow through setup. By that time, you'll have to do a LOT more than just upgrade the fuel system.

__________________________________________________________
-Tony <--- NOT asian.
'06 Wicked White EVO IX

t88 and 1500cc injectors-instant 500hp

That's all good stuff, we're probably going to try some of the small parts to keep smog regulations easy to convert. Then we'll be maximizing the fuel system and air flow. I'll probably look into some adjustable fuel injectors, as well as rewiring the fuel pump. We'll go from there. Thanks everyone for the responses.

__________________________________________________________
-Tony <--- NOT asian.
'06 Wicked White EVO IX