MIGHTYMOUSE

iTrader: (59)

how do the guys with race only cars deal with this? constantly swapping in new sensors or always splitting with some unleaded to keep them alive? i imagine they do not last long at all under say 116 octane. whats the word?

Thanks.

Pro Stock John

iTrader: (34)

Leaded gas will lacquer up 02 sensors rapidly, I would show "sluggish/slow response" codes within a few miles of putting it in.

Phate

iTrader: (2)

There was a post a few months ago about some new NGK o2 sensors that lasted a lot longer using leaded gas, might not be a bad idea to find it and bring it to the top.

Scott

MIGHTYMOUSE

iTrader: (59)

so without these ngk sensors people just ran sensors through the car? thats terribly expensive.

Phate

iTrader: (2)

Yeah, I am pretty sure that is what people have been doing.

Personally, I tune for 101 octane unleaded for my race programs...If I want more octane then that then I toss in a little Xylene or Toulene.

I think that a lot of the guys that run leaded gas eventually move to FAST or DFI and run without o2 sensors everywhere but the dyno.

MIGHTYMOUSE

iTrader: (59)

i have 100 unleaded here that has worked fine for me in the past.. i was thinking for an all out application

BIGBOS

I'm going to tune my car on 93 octane, but most likely throw in 100 when it goes to the track or if I'm going to have an aggressive night w/it...

Just to be on the safe side....

2001CamaroGuy

iTrader: (6)

100 unleaded and/or some Xylene or Toulene works for me.....

I found out that leaded kills O2s the hard way......

now I would probubly shoot someone if they put leaded in my car.....

smokinHawk

iTrader: (48)

they are Densos not NGKs, NGKs make plugs.
And no there not that expensive.
do a search in this section, Prostock John and I have a topic about them.

Pro Stock John

iTrader: (34)

You plan to run 12 or 15 lbs of boost on pump gas? I thought you wanted to go fast.

I never tried the Densos, but the price was fairly cheap.

I went to a FAST system since I am going to run straight C16 (VP 117 for FI motors) for a while on the car.

MIGHTYMOUSE

iTrader: (59)

do the widebands last on race gas?

BIGBOS

Well the car wasn't having any Air fuel problems when it was hitting higher than 12psi, that was with 93 in the tank.....

It was before when my fuel wasnt keeping up, but now that problem is solved....

Phate

iTrader: (2)

Nope, the wideband o2s will foul out as well on leaded gas...and they are much more expensive to replace.

People usually tune at the dyno with the wideband in the car and then pull it out and run without them everywhere else.

I know a guy with a car that races in the local PSCA series out here in CA and he changes the wideband after every 10-15 passes.

Scott

Pro Stock John

iTrader: (34)

My friends with FAST systems and widebands are not pulling them out Scott, why is that?

Louis

iTrader: (7)

The leaded fuel will, Over time, ruin the WB on the Dynojet.

As far as FAST widebands, and standalone widebands, Im not sure. Call FAST, or a WB manufacturer to find out for sure

Louis

FASST

Another alternative for high octane is to visit your local airport. Their gas is 100+ (I think most use 101) and it is unleaded.

While you're there you can race a plane or two down the runway

Colonel

FASST, Av-gas is NOT unleaded. It is low-lead...which is to say, still quite leaded. Also, your mixture will be thrown off because it has a very low specific gravity.

About the WB O2 sensors. It is true that they will eventually foul from leaded fuel but they will last a long while...especially if the car is a track only car (and if it isn't, then why do you need that much octane!) Ask a dyno operator about WBs and leaded fuel.

I think alot of you may not know what kind of unleaded fuels are available. Check out VPs website at www.vpracingfuels.com You'll notice that unleaded goes all the way up to 106 motor octane. 106 motor octane will carry you a long way. It's ALOT better than AV-gas!

Phate

iTrader: (2)

Not sure John. I have a WB o2 setup and after about 25 passes (15 track 10 dyno runs) in my buddies mustang the o2 sensor is junk.

The guy that I was referring to who changes them after 10-15 passes is running low 8s @ 176 with a SBF and a big turbo.

I guess your mileage may very, but most of the big dogs that I have seen pull the o2s after tuning sessions and race without them.