Race gas and O2 sensor questions

[TURBOPOWERED68]

Race gas and O2 sensor questions
i have a heated O2 sensor
When using race gas
Do I need a deferent type of O2 sensor?
Should I replace the O2 sensor when I am done with race gas?
Which type of race gas should I use to maximize performance?

 

[jasjamz]

FWIW i use a denso 02 sensor with race fuel. It works alot better than the bosch and GM units that have used. I use 110 octane leaded fuel and don't have any knock issues. Your timing and boost will play a major part in your octane requirement. Do a search on the diffrent brands to get more feedback, but I am sticking with Denso.

 

[Clark6]

the heated o2 sensor from poston is the one you want i think thats the one required (allowed rather) for race gas usage.

or if you dont mind taking it out you could always by a cheap $20 bosh unit from autozone for the track and when your done put your ac delco back in after all the race gas is burned out.

I think the higher the octane the less lifetime of the sensor. 100oct may be ok 110 is med. c-16 it wont last that long.

with my heated 02 i put c-16 in it all the time at the track and left it in and it hasnt went bad yet i still have it hanging on the back wall just in case. if i go to the track again i may put it in & keep the ac delco for my alky inj.(street).

 

[bison]

No very active narrow band sensor will last long with leaded fuel. Bosch are the most active. Denso the least. Denso get very very lazy before throwing a code. Id use 104 unleaded if you want to have long sensor life. The wideband sensors available do very well with leaded fuel. Ive run at least 75 gallons of non diluted 110-115 leaded over the wideband in my car. A narrow band wont even take one tank full before becoming lazy .

 

[TURBOPOWERED68]

Bare with me guys I have never prepped a TR for a race at the track.
Just to be clear
I am currently using a heated O2 sensor.

Should I put a regular (single wire) O2 sensor to use with the race gas?
I don't have a problem with changing the sensor if it's the best thing to do.

 

[Clark6]

like i said i think the heated 02 sensor IS what you want thats what i ran all the time for the race gas or actually i just left it in no changing, those sensors are a little more expensive but they're a little tougher i use to put 5 gallons (cheaper then) i use 4 now.. in at the track of c-16 112 etc. and made about 4,5 passes. the heated should be fine.

swapping out to the one wire is just an option if you felt like doing that only. so as not to take a chance on the other sensor, id leave the heated in though. I only went to the one wire because i have alky now. and i keep a one wire in the trunk as a spare. but if i go to the track again this fall im going to use the heated and swap and put my single AC delco wire in for the street.

 

[TURBOPOWERED68]

like i said i think the heated 02 sensor IS what you want thats what i ran all the time for the race gas or actually i just left it in no changing, those sensors are a little more expensive but they're a little tougher i use to put 5 gallons (cheaper then) i use 4 now.. in at the track of c-16 112 etc. and made about 4,5 passes. the heated should be fine.

swapping out to the one wire is just an option if you felt like doing that only. so as not to take a chance on the other sensor, id leave the heated in though. I only went to the one wire because i have alky now. and i keep a one wire in the trunk as a spare. but if i go to the track again this fall im going to use the heated and swap and put my single AC delco wire in for the street.

Thanks for the advice.
I will use a heated sensor.
But for paranoid reasons I will use one with the race gas on the track and use another one the rest of the time on the street with 93.

I am currently using a caspers heated sensor wiring harness, Do you know the part# for the 4 wire heated O2 sensor?

Also does using leaded fuel hurt any part of the fuel system? Injectors, fuel pump or fuel pressure reg.
thanks again for your help.

 

[XLR8]

The heated O2 should last longer than a non-heated with race gas. The only downside I noticed with race gas - other than going through O2's - was the price.

 

[TURBOPOWERED68]

The heated O2 should last longer than a non-heated with race gas. The only downside I noticed with race gas - other than going through O2's - was the price.

This is only for some grudge matches that I have coming up in two weeks.
Eventually I will follow the herd and go with an ALKY kit.

 

[Clark6]

Thanks for the advice.
I will use a heated sensor.
But for paranoid reasons I will use one with the race gas on the track and use another one the rest of the time on the street with 93.

I am currently using a caspers heated sensor wiring harness, Do you know the part# for the 4 wire heated O2 sensor?

Also does using leaded fuel hurt any part of the fuel system? Injectors, fuel pump or fuel pressure reg.
thanks again for your help.

I couldnt find it in postons however thats where i bought mine from.

but Kirbanperformance has them $108 part #6688 comes as a kit if you already have the heated kit you MAY can buy the sensor for it only i know poston carried it awhile back you could call them and see and get the # off their site. check with the other venders like fullthrottle and Cotton also they may have them too.

race gas only messes up the catalyctic converter over a long period of time as from what ive heard i dont know i d h 1.

 

[Eticket]

I think you'll just have to keep and eye on your o2 readings (and how your car is running) after a track day. Many guys have different results no matter what O2 they're using. I've observed that the Denso guys actually seem to be changing O2's more than most - that's only what I've observed.

My car, with stock engine, was driven very regularly... even daily driven for a long time - and raced once a month almost every month for a couple of years. I used a GM (or Bosch Ford maybe) with a Caspers O2 sensor kit. Ran 114 race fuel and then when done racing would drain as much as possible and mix back in 93 pump gas. I remember replacing the O2 about once per year (like only 2 times during this period)... both times.. it was "just because" and not that I really saw bad/lazy readings.

Two things that really help: driving the car enough with pump gas after racing and letting the o2 heat up before startup- why it was designed that way. Last, I was running water/alky on the street, which really realy helps to keep things clean. (it may be the single biggest reason why I never had o2 problems)

on the race gas side.. 114 (I think) is sufficient for most. 116-118 is kind of overkill, especially for most guys that run <25psi. at those levels, the engines just aren't burning everything in the cylinder at efficiently.

Take this as just another suggestion.

 

[breiter]

I run 110 leaded at the track and usually 110 mixed half and half with 93 on the street. Heated 4-wired 02. 25/26 degrees on 110 and 22/23 on the mixed. Rarely ever have knock. 1000 miles and 30 passes w/o 02 failure but I am sure it is coming.