I don't disagree with you, Joe. Neither my 363 nor my 331, both with a high-end stand-alone system (big stuff 3), smell clean the way a catted car does. I don't think tuning is going to solve his problem, but if his AFR is out of whack, it can definitely make things worse. I suppose the stock computer is not going to be far off on timing. I have no idea on AFR, though. So, I wouldn't know if he's experiencing the exact same thing as I am without being there. But as he started asking about systems, I made a recommendation.
You know,
@stussy2870 , if you want the ability to tune for other reasons, then go ahead as it serves a dual-purpose. However, if you're just doing it to get the smell to go away, then you can tune your idle just by adjusting timing and fuel pressure yourself. If you can't get the smell to go away at idle doing that, then you won't be able to do it with a computer, either. Air (TB set screw) will affect idle stability and speed, check TPS (should be under 1V at idle or it's telling the computer that you're not idling), ensure correct fuel pressure (39 psi, I think) before you start, and loosen the distributor bolt a bit so it spins with pressure but not on its own (need a timing light first). You might even consider locking timing out by pulling the spout so you have exact control over that, too. Then, try leaning it out and see if there's any improvement before messing with timing. That way you'd at least be able to see what you can achieve with tuning before you spend a grand on equipment.
I checked to see if you'd mentioned having an AFPR before and caught the thread where you talked about removing it because of significant fuel pressure issues. I think we need to stop debating what computer you should install and deal with that issue, first. I'd say leave the AFPR on there until you know it's bad. You've got a schrader valve fuel pressure gauge on the way, anyways. So, when you put it on there and check out your fuel pressure, you might end up finding the real issue right there. If you really are running 90psi, as stated in the other thread, then that would obviously cause a huge problem. I'm not sure a stock pump would even move fuel at that pressure, in any case I know they'd be in trouble and unable to move much volume. So, I suspect a completely wrong gauge. Plus you mentioned the car running fine at 90 and then stumbling at 70. Well, those are just crazy pressures, and it should not be stumbling in the slightest if it were really at 70, but it would be pig rich. What size injectors are you running? 19s would effectively be 26 lbs at that pressure.
