timing

What is a safe number on timing with a Brad 5 motor 12.7 comp
40-45 lbs of boost
What is a good number on egts and where does it start to get dangerous
What is a typical A/f ratio with an O2 sensor
Any input is greatly app. as this is all new to me

 

Your actually gonna run that much compression w/45#??!! Let me know how that works!

 

26* should be fine. 1150 Degrees but read the plug and decide for certain on the cylinder temps. That much boost is common in promod with that compression ratio....nothing alarming about that. Good Luck.

 

Thanks for the info,it is a pro mod with twin turbos.Im going to run efi
with o/2 and egt feedback.Id love to know a target air/fuel ratio if anyone
knows.Thanks a bunch!

 

With alky you should be in the + side of 6.1 to 1 Air to fuel ratio.

Always run rich at start of tuning process.


Jeff

 

a/f

4.0 4.5

Sean

 

Sean has got it right on the money.

thanks
Jeff

 

Scratch my response....I was speaking from a blown aspect.

 

Thanks for the input,we need all the info we can get at this point.