My wifes 01' (A4) was on the dyno a few weeks ago and the only thing it has is a TSP lid and Grantelli meter, everything else is stock. Well the a/f was a flatline 13:1 but I noticed like above 4500rpms or so I can hear a slight pinging. What can I do to stop this. I'm sure it's robbing some hp because of it. I thinking timing. Anyone? Thanks. -Mark

 

Put the stock MAF back on.

 

Does she run mid-grade??
Stock MAF as well.

 

Is that the reason? I thought since the a/f was flat and not high then how would the maf be the culprit? Thanks. -Mark

 

13:1 is good, but if nothing is done you would think the car would run fatter than that. My stock Z was in the 11 range at the top of the pull when it was stock.

 

Nope. 93 all the time. Everybody is saying that it's the MAF. I'll give that a shot. Wouldn't timing cause detanation before a lean mixture? Thanks. -Mark

 

Thats one thing the aftermarket MAF does is jack up the timing some...

 

I swear by the stock MAF

 

Carl, get back to TR. How does the meter raise timing? I'm cornfused.

-Mark

 

How positive are you it was detonation? Hook up a scan tool like autotap or any other type of reader to make sure you are getting ineeded getting knock. Just switch back to the stock MAF either way. My car came with a Granateli MAF, and it went bad, so I replaced with it with another Granateli. I saw the way and changed it to a stock one a couple of weeks later.

 

That MAF is ... "less than great" .. IMHO.

Put the stock meter back on.