I've done a lot of small mods to my engine (I/H/E, straight pipes, SOS Stage I ECU, SOS Big Bore throttle body, SOS tuned intake manifold) and my last two dyno sessions have shown an ever-increasing lean condition that I feel is robbing my car of some hosepower and possibly creating a dangerous situation. It's apparent that the problem is somewhere in the fuel delivery, since Chris (SOS) says that they did not modify any of the fuel maps from OEM on the Stage I ECU.
I tested the fuel pressure with a gauge borrowed from Chris, and there is plenty of fuel pressure. I changed the fuel filter for good measure and changed out the spark plugs to NGK Iridiums. Finally, I've been running BG44K through the fuel system in an attempt to clean the injectors and hopefully fix the problem. However, I got an idea recently and I think I'm about to act upon it. I figured that I would post here to see what others think, and see if someone else has actually done the same thing before.
With all of my supporting mods, my car should be putting out greater than NA2 horsepower. Since there is about 15% greater fuel flow from the NA2 injectors, why not install them in a modded NA1 car? I've read the threads here that say the NA2 injectors are backward-compatible with the NA1 motor......so why can't I find any threads where someone else has actually done this? Wouldn't this be a better solution than having to worry about having pristine clean NA1 injectors that (best case) are approaching 100% of their flow capacity? Can anyone think of a reason not to put NA2 injectors on a slightly modded NA1 car?
Anyways, I now own a set of NA2 injectors and plan on installing them in the next few days. Just looking here for input beforehand just in case there is something I haven't thought of. Barring any unforeseen roadblocks, I'm going to dyno the car on the 15th and see if I get any improvements to the A/F and horsepower.
Thanks!
Chuck
I tested the fuel pressure with a gauge borrowed from Chris, and there is plenty of fuel pressure. I changed the fuel filter for good measure and changed out the spark plugs to NGK Iridiums. Finally, I've been running BG44K through the fuel system in an attempt to clean the injectors and hopefully fix the problem. However, I got an idea recently and I think I'm about to act upon it. I figured that I would post here to see what others think, and see if someone else has actually done the same thing before.
With all of my supporting mods, my car should be putting out greater than NA2 horsepower. Since there is about 15% greater fuel flow from the NA2 injectors, why not install them in a modded NA1 car? I've read the threads here that say the NA2 injectors are backward-compatible with the NA1 motor......so why can't I find any threads where someone else has actually done this? Wouldn't this be a better solution than having to worry about having pristine clean NA1 injectors that (best case) are approaching 100% of their flow capacity? Can anyone think of a reason not to put NA2 injectors on a slightly modded NA1 car?
Anyways, I now own a set of NA2 injectors and plan on installing them in the next few days. Just looking here for input beforehand just in case there is something I haven't thought of. Barring any unforeseen roadblocks, I'm going to dyno the car on the 15th and see if I get any improvements to the A/F and horsepower.
Thanks!
Chuck