air fuel ratio?

nomad · 10-28-2013, 11:13 PM

Quote:

Originally Posted by 1320racer

I've been tuning my bracket cars and others, sbc and bbc for nearly 25 years and I never used an air/fuel gauge or wide band and my current bracket car runs well in the 8's. Jet for best MPH and a richer not leaner is best for consistency.

An O2 sensor is not the end all. It's just one tool in your tool box. I use an O2 with my data recorder but, at the end of the day I'm still checking plugs and jetting for MPH.

Belvedere II · 11-07-2013, 05:48 PM

My narrow band sensor setup was pretty useless for actual numbers but did indicate I was running out of gas on the top end when it happened and got me to pull the tank and fix the pickup. That problem was pretty easy to diagnose though without the meter. More recently I installed a wideband Innovate setup and found my carb leaning out at a certain point. I thought the problem was being on the edge of a timing advance limit when street driving, but with the sensor watched the A/F run from 11's and 12's to 15 then 16 then 17:1 as the car started bucking during that part of pedal travel. Searched online to find this was a common problem with Demon carbs and that replacing the HSAB's fixed it. I stripped a couple of helicoils from the Demon this year and put my old Thermoquad on to finish the year, really slick to see how a street oriented carb runs compared to a race design. I think it'll be a more useful tool with the capability to record and review exactly what the A/F is doing during a race, but haven't gotten those pieces yet.

TDCRACING · 11-12-2013, 02:51 PM

Well since then I've gotten a wide band AEM gauge and seem to have some luck with it raised my primary jets 2 sizes and rears 3 sizes but having a little tough time watching the gauge during passes. But had to end the year with a bad transmission. So well see what the new year brings.

HandOverFist · 11-13-2013, 01:45 PM

Quote:

Originally Posted by TDCRACING

Well since then I've gotten a wide band AEM gauge and seem to have some luck with it raised my primary jets 2 sizes and rears 3 sizes but having a little tough time watching the gauge during passes. But had to end the year with a bad transmission. So well see what the new year brings.

Install a GoPro camera in the cockpit for runs down the track focused on the afr gauge/tach.

Mytcar34 · 01-06-2014, 08:33 PM

I use a innovate data logger you cant beat it for info. if your a/f ratio goes south you know exactly when plus it can be used to monitor tire slippage, rpm etc . Works on every thing from stock eliminator. street car, bracket.racing. I would not even consider running nitros without one.

11-07-2013, 05:48 PM	#2
Belvedere II Junior Member Join Date: Dec 2010 Posts: 6 Likes: 0 Liked 0 Times in 0 Posts	Re: air fuel ratio? My narrow band sensor setup was pretty useless for actual numbers but did indicate I was running out of gas on the top end when it happened and got me to pull the tank and fix the pickup. That problem was pretty easy to diagnose though without the meter. More recently I installed a wideband Innovate setup and found my carb leaning out at a certain point. I thought the problem was being on the edge of a timing advance limit when street driving, but with the sensor watched the A/F run from 11's and 12's to 15 then 16 then 17:1 as the car started bucking during that part of pedal travel. Searched online to find this was a common problem with Demon carbs and that replacing the HSAB's fixed it. I stripped a couple of helicoils from the Demon this year and put my old Thermoquad on to finish the year, really slick to see how a street oriented carb runs compared to a race design. I think it'll be a more useful tool with the capability to record and review exactly what the A/F is doing during a race, but haven't gotten those pieces yet.

11-12-2013, 02:51 PM	#3
TDCRACING Junior Member Join Date: Nov 2011 Location: Pemberton N.J. Posts: 21 Likes: 0 Liked 0 Times in 0 Posts	Re: air fuel ratio? Well since then I've gotten a wide band AEM gauge and seem to have some luck with it raised my primary jets 2 sizes and rears 3 sizes but having a little tough time watching the gauge during passes. But had to end the year with a bad transmission. So well see what the new year brings.

01-06-2014, 08:33 PM	#5
Mytcar34 Junior Member Join Date: Nov 2013 Posts: 11 Likes: 0 Liked 0 Times in 0 Posts	Re: air fuel ratio? I use a innovate data logger you cant beat it for info. if your a/f ratio goes south you know exactly when plus it can be used to monitor tire slippage, rpm etc . Works on every thing from stock eliminator. street car, bracket.racing. I would not even consider running nitros without one.