Well to be honest you'll never need 48lb injectors unless your engine is going to be producing 350hp. And a stock 3.4 iron-head V6 won't produce this number and stay together long. I work with tuning these engines all the time in the Fiero community and lots of guys have turbocharged them (the 3.4 Camaro iron-head V6 swap used to be the most popular swap/upgrade for Fiero guys to replace their stock 2.8's with). Most struggle to get these engines to produce more than 225hp with boost unless they really give the heads a work over and run a custom turbo cam. But even then they are using forged pistons. Most people who just slap a turbo on an otherwise stock engine are only making about 200 - 225hp depending on mods, and the most boost they are running is about 7-9 psi. 5-7psi non-intercooled is what I would consider a maximum safe level to run on a stock engine. Can you run more? Perhaps, but you had better be keeping an eye on your engine's AFRs and Knock Retard while operating it under full boost otherwise you run the risk of damaging it.


If you were going to keep and use the stock distributor that came in your 3.1 (and put that in your 3.4 during the swap), the only programming we could really use in your stock 1227730 ECM would be for a Syclone/Typhoon. However, since all 3.4's were set up to run DIS (distributorless ignition systems), I would highly recommend using that over a distributor any day of the week because it is far superior, even to aftermarket distributors and ignition systems. And if you went with DIS, you could use the Turbo Grand Prix code-based programming in your stock ECM which is more capable than the Sy/Ty programming, in my opinion. However, you might find the MegaSquirt system to be more forgiving and easier to tune for boost than one of these factory systems, especially if you have a local friend who can tune the MegaSquirt.

Hope this info helps. Let me know if you have any other questions.

-ryan

* 270whp is pretty impressive out of one of these engines.* I've seen a lot of guys dump a ton of money in these engines and can never seem to get really good power numbers out of them, because of the restrictive iron heads.* They usually need to dump the iron heads altogether and go with later model aluminum heads.* Regardless, if you can do it, more power to you.* As far as what computer to use, that is up to you.* If they guy in PA has experience building these engines to make good power with the MegaSquirt, then maybe that will be your best choice.* Tuning the Sy/Ty ECM code to work on a 3.1/3.4 isn't easy in the first place, and getting it to work good on a 300hp turbocharged 3.4 probably isn't going to be a cake walk either.* I'm sure it can be done, but the question is how much time is it going to require to get it dialed in?* If the guy in PA already has a working MegaSquirt ECU tune for what you are doing, that might be the best way to go.* I can tell you I haven't tuned any 1227730/iron-head turbocharged V6 combo that made that kind of power.* Not saying I couldn't do it, but I don't have the experience so maybe it would be better to go with the MegaSquirt setup for your build.
*
-ryan