I need some guidance. I have been building a 383 from the bottom up for my 1990 Iroc and I bought the FIRST fuel injection intake assembly for my project. I'm using AFR 195cc heads and I bought a cam through COMP at their recommendation. It's a 236 intake and 242 exhaust @ .050, lobe lift is .3470 and .3600 respectively, with a 112 lobe separation. I was told today that it is too big of a cam to tune and work with the speed density ECM.

I've been a mechanic on private jets for 14 years, so I'm not computer illiterate, but I am a newborn baby when it comes to automotive fuel injection programming. Can someone explain why it's not feasable? Has anyone else used a similar setup with results? And can anyone point me in a good direction for assistance or a different/better ECM and harness that will work? Money is not a super big object, I'd like to get away without modifying or hacking things up tremendously (within reason). I've been looking at the FAST retro fit setup that First fuel injection sells but I don't know anything about it really.

 

It will work fine once tuned. I've run alot bigger on 730's

 

Yeah, I don't think I'm really reinventing the wheel or anything. My plan originally was to have someone make me a custom chip to get me started. And then tune from there

 

You probably can handle it yourself. Basic changes to get a "startup" bin is fairly easy to do. A good wideband o2 will be a great help. Once you can get it to fire to get an air fuel reading, its fairly easy to make fuel adjustments from there

I would set rpm for idle, smooth out the timing table and give it alot more advance at the idle areas to get it to start. Big cams seem to need abit more advance to idle and start. Set the injector and engine cyl size.

 

I'm running a slightly smaller cam in my 305 duration wise with more lift and overlap, you'll be fine.

This is what I run, stick with the stock harness;

http://dynamicefi.com/EBL_P4_Flash.php

 

Ok, that's reassuring. Thanks for the insight guys. I'll do my research

 

I ran a 242.254 .550.585 110lsa cam on that ecm in a 383. Didn't have any power brakes, but the car ran fine.