Originally posted by Profoxcg
eveyone's car at the track today where pretty clean, no oil on the pipes or body where the pipe comes out. however mine has a lot of oil and dirt and oil residue. I was wondring, this could be because the car is too rich correct? because i am runing 25% fuel which has much less oil than 20%.
since i want to tune my engine, how do i know how to set the low end needle?
thanks
I am sorry for asking to many questions, its just that after being at the track today I realized all these things, and the guys out there are busy alot of the time. 
The lack of residue can be from many factors. Caster %age in the oil and many things. Don't worry about it. Tune the motor firstly by sound and how fast it is. Then if you like you can check the temps. Different fuels give off differnt amount of visible exhaust trail and leave different amounts of residue. Dont tune by "looking for a smoke trail" as some people advise.