ever heard of drilling a hole in the headers for dyno tune?

[SStatus]

I'm getting a dyno tune next week and the guy i talked to said they regularly drill a hole in one of the headers to insert the sensor or whatever. He said this is to get the most accurate reading. Hes said its a 75 dollar charge and then they weld the hole closed when they are done. is this complete BS or do people do this?

[Ed Blown Vert]

He is talking about adding a wideband sensor before the cats. Yes that is accurate. But most don't do it. And just stick the sensor in the tailpipe.

If he still wants to do it, don't have him weld it back up. Have him install a bung and cap it off. This way if you ever want to run a wideband you can.

[ss~zoso~ss]

good idea about the bung

[ninobrn99]

75 is far too much. it should be about 10 bucks for the bung(if that) and 20-30 to weld it in. depending on the shop. Id suggest you have a muffler shop do it for ya, then take it to him so they dont overcharge you. That or if he's tuning just WOT, then he can use your narrowband bung and place the sensor in there. much easier since he isnt using them to tune just be sure to unplug and seal the narrowband if he doesn so it doesnt get exposed to fresh air while reading. could throw it off later.

[GA Country Boy]

He is talking about adding a wideband sensor before the cats. Yes that is accurate. But most don't do it. And just stick the sensor in the tailpipe.

If he still wants to do it, don't have him weld it back up. Have him install a bung and cap it off. This way if you ever want to run a wideband you can.

Ed I find myself agreeing with you all the time! I'm just wondering WHERE he would put ONE. I think if he's going to do that he may as well do it in both headers and then you could add dual sensors down the road. If you put a wide band in ONE header wouldn't you be tuning that bank and assuming the other bank is exactly the same when it may in fact be richer or leaner. I think that's a good argument for the tailpipe method because you're reading a mix of both banks.

[ninobrn99]

then put it in the Y pipe where they both merge so you're getting a more accurate afr since you're both banks are mixed.

[GA Country Boy]

then put it in the Y pipe where they both merge so you're getting a more accurate afr since you're both banks are mixed.

That makes sense. Of course we're just speculating where they should put it, but have no control over where they will put it.