Project84

I did a search, but it brings up every post about fuel and injectors but the one I want. I know I've seen it on here, but I can't find it. How do I tell the stock ECU that the secondary injectors are bigger than the stock 460s?

EndlessRPMs

first pull up the pass side footwell carpet....you take the metal plate out...you then look at it sternly, and while shaking your finger at it, yell "I UPGRADED MY DAMNED INJECTORS! DEAL WITH IT!!"

Project84

Come on now, I know I read it somewhere but I can't find it. What do you have to do for real?

Project84

Does anyone know? Or do I just get 1 smart *** answer and thats it?

jimmyv13

The easiest way is to use a piggyback fuel computer, like an S-AFC.

The best was is to get a complete EMS... Haltech, Motec, etc.

astrochild7

iTrader: (3)

look for what they call fuel computers....

Jerk_Racer

In short - you can't do it for free.

Here are some of the recently populare piggyback fuel computers.
Apex'i S-AFC
HKS S-AFR
GReddy e-Manage

There's more ways to get around this, but it costs more than a few hundred. Saying you just want to change the injector is definitely easier said than done. The tools to do it right cost money. Welcome to car tuning.

NZConvertible

You don't need to change your injectors! The 460's can flow enough fuel for over 240hp, which you won't get near without a bridgeport. I'm not sure what the limit of the NA fuel pump is, but you'll need to upgrade that long before the injectors.

Bridgeported

The cheapest ECU upgrade would be about $250-$325. That would be the stock ECU, but sent out and reprogramed with new maps. Companies like www.superchips.com do this, and usually have a few days turn around time. Good if you are doing basic bolt on upgrades and don't plan on upgrading even more in the future, b/c then you have to change the ECU all over again. (in that case, the SAFC would be good)

Jerk_Racer

Remapped ECU's are not a good idea for a car guy. Seriously, WHO can stop upgrading/changing/tinkering with stuff after one change? In theory they are the best, but piggyback stuff is great because they allow you to change settings as you change stuff. The best way to go is stand alone ECU's. ULTIMATE CONTROL!!! But that comes as a price that most don;t want to get near. Plus they require a lot of confidence in your car to start digging in there deep enough to put in a stand alone. Ultimately in a perfect world, all changes are setup on a dyno while using a wideband O2 sensor. But that doesn't happen. It's expensive and a pain to do. Such is life. So are popped engine.

Bridgeported

I agree with you 100% Jerk_Racer. I was just stating that it is another option, and can work well for some guys.
Most on the other hand (like myself) would prefer something adjustable, since like you said the tinkering never stops.
Basically when it comes to engine management - the old adage (spelling?) holds true: You get what you pay for.

Jerk_Racer

Yep. I wasn't disagreeing with you either. I just feel remapped ECU's don't work well because guys use them. If you got your girlfriend one for her Jetta 1.8t then no worries. But guys can't leave well enough alone. It's in our DNA. Places that do remapping are going agains our genetic heritage. We're guys, damnit!!! If it ain't broke, we'll break it then fix it.

jacobcartmill

iTrader: (6)

***** whut?

you cant. these ECUs are about the most worthless electronic device ever put in a position to control an entire engine...

you'd have to get some kind of fuel computer (piggy back) like an safc or e-manage.

silverrotor

iTrader: (1)

My girfriend has a 2003 Jetta 1.8T. Silver too.
Maybe I should get her one too.

Project84

Last night when I posted this, Apexi.com was down, and I went to www.rx7store.net but their explaination wasn't as in depth. I wasn't 100% sure if the S-AFC would do what I'm trying to get done.

You don't need to change your injectors! The 460's can flow enough fuel for over 240hp, which you won't get near without a bridgeport. I'm not sure what the limit of the NA fuel pump is, but you'll need to upgrade that long before the injectors.

Its not for the stock engine. The engine in the car now is stock, but this is for the one I'm building in the garage. I have a 6 port made up of turbo rotors, turbo rotor housings, and a turbo center plate, and N/A end plates. I chose all the plates with the largest ports. I originally planned on adding a supercharger, but for now it will be NOS. Maybe later on down the line I will see how difficult it will be to add the turbocharger so I can keep my fuel injection or I may still decide to go carbed and SC. Its for drag racing so I want enough fuel to keep up with all future upgrades so my immediate changes will be a walbro 255lph pump, pressure reg, and injectors. I was thinking of using the GSL-SE stock 680s for primaries, and maybe 1000cc's for secondaries, depending on the amount of NOS.

Bigretardhead

you're gonna lose some power with those turbo rotors, you know I'd think again about that supercharger

or constantly use Nitrous