wideband at end of exhaust is this inaccuarate

[bob123131]

Last time i got my car dyno tuned my injector percentages are basically at stock which i know could be right with a minimal size turbo, but my question is, when they put the wideband in the end of the exhaust pipe since i dont have one is that accuarate. Could tiny unknown exhaust leaks greatly through off my tune? Basically I planned to get my car tuned one more time and then no serious mods for two summers or so and i would rather not bUy a wideband right now if the dyno companies is just as accuarate. With only an safc2 though and no real data logging ability im nervous this could be detremental to my engine. Oppinions?

 

[1fast93tsi]

I believe the closer the better. I would think it would throw it off some.

 

[kronus]

If they dyno used a WB at the tail pipe to tune, I would say you'd be safe. Technically your AFR shouldn't be affected by length of exhaust (assuming you have no leaks), unlike your EGT. However, I see that you have a SAFC and no WB? And no logger? Definitely invest in a WB before you even start to mess with the SAFC. Also get some way to log so you can watch your knock. A dyno tune should be safe, and as long as you haven't made any changes to the variables they tuned with, you ought to be fine.

 

[bob123131]

yea i don't plan to mess with the tuning at all really. I just did an oem rebuild and untill i can afford to upgrade the turbo and do full internals im not going to be modding so once i get a good tune i will be fine.
So basically i will be fine for now with my current tune from the shop as long as i dont mod or adjust boost etc? Thanks for the help, guess im buying those HID'S on the vendor announcement.

 

[crimsondragon]

The reading from the front of the exhaust to the back should be the same throughout unless you have an exhaust leak.