themealonwheels

iTrader: (20)

I'm a novice when it comes to tuning, so please bear with me... Back in July, I got a dyno tune of my 02 Z28 with a 383 LS6 and was very pleased with the driving manners of the car. Since then, I've done a lot of parts swapping on the intake/exhaust sides. I swapped from a Typhoon intake to a FAST, swapped throttle bodies, swapped my Pacesetter LTs and ORY to TSP versions, changed the catback from Flowmaster to Magnaflow, I even changed my PCV configuration from stock to an LS6 valley cover with a catch can and truck PCV valve.

I also added a wideband Autometer AFR gauge to the intermediate pipe, since I intend on adding nitrous and want to keep an eye on the A/F. I know that putting the sensor on the intermediate pipe is less than optimal since it reads a bit leaner, but it's reading REALLY lean at idle, between 16 and 17. I don't know where it was before my modifications after the tune in July, I only recently connected the gauge. I do know the dyno tune had it at ~12.8-12.9 through the entire RPM range on the pulls.

I have a dyno day scheduled in the beginning of April about 10 miles away, mostly highway. Is it safe to drive up there? Any input is appreciated, guys!

Old Geezer

iTrader: (3)

Lean at idle.... What does it read at low speed driving?
Your WB may be giving you bogus readings with headers, and the location of the sensor...

themealonwheels

iTrader: (20)

I sure hope it's false! I've only driven it maybe a mile total and it was at least a week ago, I may try again and see about getting video. But if it does turn out to be real, would you drive it to the tune?

kenp

iTrader: (9)

That's probably where you were idling all along. You just didn't know it because you didn't have the wideband prior to your parts swaps. Anyhow, it isn't going to harm your engine to show idle a bit lean on the WB @ idle & low RPMs.

SS SLP2

iTrader: (8)

I think you will be ok for little drive as is, I would not do any hard pulls on the engine, just take it easy
just my .02s, Johnny

themealonwheels

iTrader: (20)

Thanks for the input, guys. That was my school of thought, especially with forged internals and a mild highway trip, just wanted a little feedback. I'll be interested to see what the difference is in the A/F reading once the car is optimized for the new breathing parts...

Frans96SS

iTrader: (15)

The fast will cause it to run lean. Are we the ones tuning it?

themealonwheels

iTrader: (20)

Hey Fran! Yes, you guys are the ones tuning it... I'm excited!