Why are my plugs all different colours?

[IBLOWN]

Yes that is correct but I pulled one years ago that was very corroded and never sent a code, you should also look at getting the same size velocity stacks, even on a stock Busa the exhaust temps are varied between 1-4 and 2-3 when running stock stacks[/QUOTE

I always wondered why the 2 centre stacks were longer? Surely theres a good reason?

[IBLOWN]

Well... I just went and checked the fuel pressure.

46-47PSI.

Hmmm.

[Professor]

No o2 sensors.

Was it orginally equipped with an o2 sensor?

[IBLOWN]

Was it orginally equipped with an o2 sensor?

No, its a GenI Australian. It would be nice if it had o2 sensors though.

[IBLOWN]

Ive got no-idea what went wrong.

I went ahead and got a PC5 and a dyno tune.

What a difference lol! So much smoother, noticable power and snappyness. Money well spent. A bit better on fuel too lol.

Looking at the map in the PC it was exactly what i thought. Rich as hell in the lower RPM's from idle to about 4000RPM. In some places it was 24% rich!!! Up high was ok. It was all over the place, every couple of RPM was completely different.

Havent pulled my plugs out to check colour yet. Probably wont anyway. Its tuned now, too bad, they can stay like that now...