For the time being I’m going to stick with the stock ecu since I just picked up a first gen to 13b swap. So I was wondering what mods I would reliably(or close to it) be able to do while keeping the stock ecu?

 

NA or Turbo?

 

I’m going to go single turbo but i’ll port the motor and probably do like fd rotors and balance the e shaft or something I don’t know it’s still in the works

 

Then you almost certainly won't end up using the stock ECU.

The stock ECU doesn't have any learning functions, and won't be able to cope with that sort of mod. People run into boost cut just installing an aftermarket exhaust. You could use an S-AFC to tune fuel or add larger injectors, but you probably want timing control with an aftermarket turbo and non-stock rotors. This means you would at least need an rTek, which is a chipped version of the stock ECU that can be tuned using a palm pilot (or emulator). But these are no longer produced, so whether you find one depends on what's available near you. Also only certain rTeks have timing control functions, so you need one of those specifically. And this is still just a chipped version of the rudimentary stock ECU.

The best option if you're not going with a bone-stock or near-stock engine is probably to go with a standalone. Others who have more experience with turbo models may have more advice for you, but given that you have internal mods planned it's likely you're already investing into this build. Going with a standalone will save you headaches later.

 

sorry for the confusion I have a fb and fc and I was referencing the fc I have a stock na s4. I was just wondering what I can do to it while I spend the time and money I need to get the fb right and then i’ll go stand alone on the fc I was already planning to go stand alone on the fb. That’s my bad I should have been more clear.

 

It's alright, I interpreted from your first post that you wanted to swap your 2nd gen 13B into your first gen and use the stock ECU, which is why I asked whether it was NA or Turbo. No big deal

As to what mods you can do to an NA FC on the stock ECU, the answer is basically any reasonable bolt on. You can do a full exhaust (though make sure you keep the 6 port system functional), intake, and emissions delete (if legal in your area to do so). I'd say only delete the emissions if you need to, if it's working fine don't mess with it. If you do alter the emissions, keep the BAC valve and thermowax system intact. The exhaust will net you a few hp and let you change the exhaust note if that's your thing. Racing Beat makes really nice parts, but they're pricey so they may slow down your FB project. I'd look for a good used exhaust near you and see what's available.

I'd advise that you don't alter the intake. The stock intake is perfectly fine and already has a duct to take cold air from the front.

Adding some sort of tuneability may get you a couple more hp from it, but all of these will run happily on the stock ECU (as long as you don't remove the BAC and thermowax).

 

You pay for insurance to keep your car legally on the road? See an aftermarket ECU as a form of insurance to keep your car on the road the same applies only difference is you make one big payment that will ultimately keep your car alive. An 80s computer being an early EFI car can't keep up.