done12many2

iTrader: (33)

Well, let me start off by saying that gutting the cats was one hell of an experience. Some friends and I got the car up on a lift and had absolutely no problem with the removal of the cats. As a matter of fact, we removed all of the nuts from the bottom of the car and did not have to go through the top with a 3 foot extension like most people I have read of. The real work came when it was time to gut the cats themselves. After a good, bit we were able to get the material packed into them thoroughly removed. I could not believe how much stuff we removed! We bolted them back on and went for a test run and right away I noticed a big difference. I love the sound and there is no raspiness anywhere throughout the powerband. Total time with three people was 2 1/2 hours.

Today I went to go have it tuned again and I discovered that there was quite a bit of gain. The best I did before after tuning was 240.0 HP and 229.9 TQ, which was about two weeks ago. Today I hit 255.2 HP and 242.4 after gutting the cats and retuning. I knew that my butt dyno was telling me that there was definitely an improvement. The combination of gutted cats and the Injen exhaust is loud but very good sounding. Just may be a bit much for some people. One last note. I did not throught any CELs at all.

PhoenixINX

Interesting.

I might recommend you get the TS reflash, as the variable in our ECU will begin to change the tune you just plugged into your SAFC.

With the reflash, they can decline the effective of the variable, and not allow the car to "tune" itself.

Just some FYI.

Not bad for what you have, watch that AF as it's starting to creap high... time for a plenum and headers!

www.crawfordz.com

done12many2

iTrader: (33)

If it does change, how long will it take? It didn't change any between the 27th of July and the 13 of August, just over two weeks. You are right, I will definitely will be getting those headers and a plenum!

PhoenixINX

Typically it change with a matter of a few start-ups and runs.

I personally would like to see your car on a dyno again. Are you running an AF so you can compare then to now?

done12many2

iTrader: (33)

Okay. I will post my results. On the first one, I had my SAFC II installed but absolutely no adjustment had been made at all. You'll notice that shortly after 5500, the AF started dropping off and ended up around 11.7 at 6200 +. The pull that it is comparted to on the sheet is after the leaning. Just about 13.8 across. The second graph will show the best results that day with a 13.8 AF. Both of these were done on 27 July. On 13 August, you can see that it was still well into the 13's. We actually ended up richening the AF around 6000 which resulted in better power up top.

done12many2

iTrader: (33)

#2

Refer to my original post to see the AF two weeks later. I do not believe that the ECU is adjusting or negating any changes that we make to the AF.

slocivic2003

car sounds great,cant wait to see it run. later jason

PhoenixINX

Nice examples...

Though why is he richening it up THAT much up top?

It hasn't caused you to make any power. More so, why was the run aborted at 6100-6200 rpm????

I would attribute those gains more to the cats, than the AFC btw.

Jason@Performance

iTrader: (11)

ive gutted the cats on my previous cars... but this car, so much eaiser to jus tput on test pipes

redls1

Ive put test pipes,y pipe and 3" exhaust back. Quite loud and I have a slight rasp that I dont like but I will live with. Wife said its too loud. I said you dont have to drive it.

done12many2

iTrader: (33)

On the graph where you see the two runs compared, the first run in the blue is before any tuning was done at all. The red indicates the pull that was done after the leaning out of the AF. The reason why he stopped at 6100 to 6200 rpms is because he was being extremely cautious when he thought he heard some det. Turned out not to be the case at all, but I am glad he reacted the way he did by immediately aborting the pull. Anyways, you can see that my Z was running extremely rich at the top end before any tuning (blue) and running pretty consistant at around 13.8 afterwards. On the graph that is right below this one (242 HP and 229 TQ) you can see the AF all the way to 6500 at around 13.8 to 13.9. On yesterdays tuning, we richened it up a bit after 5300 rpms to around 13.4 and it resulted in a bit more power up top.

I absolutely agree that I can attribute most of my gains from this last dyno/tuning to the gutted cats themselves, but I know that the tuning helped a bit as well. My first couple of pulls yesterday without any retuning showed that the gutted cats themselves netted about 7 HP. After the tuning, the total gain was 13 over my highest pull without the gutted cats two weeks ago. I think that the gutted cats really allowed the Injen exhaust and intake to really come together for a good increase in power.

What would you recommend first? The plenum or headers? I am leaning towards the plenum myself.

jjellyneck

What would you recommend first? The plenum or headers? I am leaning towards the plenum myself. [/B][/QUOTE]

I'd go with the plenum first because it's cheaper and you can do the install yourself in an hour or so. Gains should be nice.