running a blacktop 02 on a redtop!!

[nujabe]

my problem is im getting really bad gas mileage.. like 50 miles on half a tank
wich is really driving me crazy its
i have a redtop sr with gt2860rs, 550cc injectors, red top power fc, tomei 256 cams.. nothing crazy in short.
couple months ago i traded a friend turbo elbows. the one that came with my redtop. i never noticed if mine was fat type or skinny but this one seems to be a fat type.. my main question does it even matter fat or skinny also when my car was tuned it was tuned on the fat that in currently in the car ! should i swap it for the a skinny type or does it even matter. i think the 02 thats currently in my car may be done. any help on why i maybe getting such bad gas millage will help !!

[fliprayzin240sx]

You can try turning off the o2 input into the PFC and see if that helps. If you turn it off (basically just running off the tune) and your mileage gets slightly better, then your o2 is done. If you have a redtop, you should have had a skinny one. You can always buy another skinny one and get a fitting to use it on the fat o2 sensor elbow that you have now.

[nujabe]

thanks man !! one more question should i just bite the bullet and buy a sr20 skinny from frs sport or can i use the 280zx. ?

[fliprayzin240sx]

Look in the FAQ just to make sure but I'm pretty sure 91-93 Sentra SR20 o2 sensors are the same as the skinny redtop sensors.

[KiLLeR2001]

'87 300zx turbo oxygen sensor is the skinny one.