s14 cams in s13...

[nightsauce]

Ok, so I have a rebuilt ka with s14 cams. I'm running this setup in my s13 with an s13 ECU and I'm getting detonation above 3k. I was wondering if maybe because the cams were a bit different that the ECU is dumping less fuel at a certain RPMs. If someone has the stock maps for both the s13 and the s14 ka's that would help.

[compactfean]

only way those cams could cause detonation is if you are running lean. The larger s13 cams will give you more power and may richen your afr a little, maybe. (larger cams make you run a tad richer but s13 and s14 aren't that much of a difference). The other thing you should check is base timing and afr (with a wideband) to see if there are other issues. What are you monitoring knock with?

[nightsauce]

I'm not monitoring the knock with anything but my ear. I hear a marble sound only above 3k. I recently went to get my car inspected and during the high idle test (at roughly 3k) my ka was outputting gas at 120ppm which is way under the accepted 220. I can only assume that the higher the RPMs the less fuel. I'll pick up a wideband if anything but I'm trying to figure this out before hand.

You got me thinking now it may be my fuel pump or fpr.

[compactfean]

120ppm hc? If so hc is a result of incomplete combustion, usually caused by 2 things. One would be ignition related failure such as spark plugs, cap, rotor,wires. The other way usually results in high co or nox along with high hc which would be a lean or rich misfire. If you have high co and hc is good this is a result of a rich fuel mixture. A lean mixture usually will result in high nox gases and sometimes a slight increase in hc. With that being said, if your car passed all the limits there are no indicators of running lean ...or rich. I would get a consult cable or take it to someone who can scan and monitor obd1 and check to see excactly when its knocking (if it is) and what the rest of your engine is doing to cause this.

[nightsauce]

I was running really rich at idle. Installed my NGK plugs/wires, new cap n rotor too. The car seems a bit more responsive and idling better. The valvetrain noise is still there only around 3500rpms tho. Before and after that it is fine. I'm wondering if the valve shims/clearances are off. I'm going to go again this weekend for inspection to see how my car does this time.

[compactfean]

What do you mean by "rich" at idle? If it is just rich at idle ive got some pointers. What were your numbers?

[nightsauce]

My numbers were

IDLE
HC ppm : 448 / 220
CO% : 3:28 / 1.20
CO2% : 9.8
O2% : 4.6

High IDLE
HC ppm: 141/220
CO% : 0.49/1.20
CO2% : 14.0
O2% : 1.4

Im in line for inspection now. Gonna see how I do after the new parts

[compactfean]

Yeah def running rich at idle but with hc and co up like that......thats what my numbers look like running no cat. You could be having issues with your air injection as well. What is your fuel pressure at?

[nightsauce]

Car failed again. Numbers came out worse, and this time it failed high idle as well.

I was wondering if my cat was bad or needed changing. The only thing used in the entire system is the cat, injectors, fuel pump and fpr. Idk what my fuel pressure is. Timing is where it should be. It's odd because the car is running the best it ever has. Getting 350 highway miles a tank (roughly 25-26mpg)

[compactfean]

First 2 things I would check is fuel pressure and coolant temp sensor. Those are going to effect idle air fuel ratios. Your definately running rich because ive got 740cc injectors and run better numbers than that with no cat. I dont think your o2 is bad because your numbers are decent up top. I would address the running rich issue before replacing the cat. Also you can wire up the air injection to be on through the whole test (if its even working).

[nightsauce]

My o2 sensor is new. I ordered the coolant temp sender/sensor but they sent me both s14 ones. Air injection system? New to me.

[compactfean]

under the air box is the air pump, it pumps air into your exhaust to help complete combustion.