hoTTub

What APR told you about the A/F ratios is ABSOLUTELY true! When you are using a tailpipe sniffer, it is very innacurate for *real* a/f ratios for tuning or analyzing. The only true way to get a reading is to drill a hole in the downpipe and weld a bung (no Beavis jokes) for an O2 sensor that is similar to the stock but is much more sensitive and samples more often....

Anyone looking for real #'s or one off tuning MUST get one of these bungs welded in, there are a few places that have dynos that will not even put your car on unless you have this done.

So relax, your A/F ratios are probably not as bad as you think.

Larrytt

hehe . . . he said bung! lol

economisTTwo

thanks for the info, sean -- any other ways to get an accurate air/fuel reading?

Rennen

...that really explains a lot!

hoTTub

even a A/F ratio gauge is only as accurate as the o2 sensor it is getting the reading from....A/F is good for full throttle rich/lean reading but not for *EXACT* ratios. As far as I know, the only way to get true readings are by the way I mentioned.

Rave'nGTi

very $$$$ last time I checked they were close to 1300 a piece?I can look it up if anyone is interetsted

MichaelTT

Any idea of a %age of variation between the 'bung' and 'up the tail pipe' scenarios?

Rave'nGTi

we are going to bring my boyfriends Nova down to be dyno'd here within the month....

His car is fitted with speed-pro fuel injection with a wide band O2 mounted in the correct location. We can hook up the laptop and monitor the A/F ratio off the wide band and compare it to the tailpipe reading taken by the sniffer for you guys.

Chaka

Can't you just hook up a lap top with a VAG tool and have someone meter it when driving?

MichaelTT

Sounds good...