Don Terrill’s Speed-Talk

What's the best air-fuel ratio monitor for leaded race fuel for a bracket race type car? I would love to keep the price under $400.

408 Nova wrote:What's the best air-fuel ratio monitor for leaded race fuel for a bracket race type car? I would love to keep the price under $400.

I have found the NTK sensors seem to last longer than the Bosch

NGK AFX powerdex

coolchevy wrote:NGK AFX powerdex

Yep.

Will lead affect the NGK any?

408 Nova wrote:Will lead affect the NGK any?

All of them are affected by leaded fuel. The NGK seems to last the longest.

AFX for sure.

I use an Innovate LM-2 and I'm satisfied with it.
Records to an SD card. Will also record RPM thru a run (with the optional RPM cable). Displays on a graph so you can see your fuel curve through a run.
Nice to be able to review (and save) the run afterwards - not trying to watch it as you go down the track.
Uses a Bosch sensor. Innovate literature says ~25 hours run time on leaded fuel. (a lifetime in drag racing).
I run Avgas 100 low lead ~ 100 runs on my sensor - haven't killed it yet.

Appreciate everybody giving me advice.

How much ET and speed has anyone ever tuned out of your cars using an air-fuel ratio monitor? Are they worth it?

What features make the NGK the preferable system to use, as compared to AEM, Innovate, etc? I'm really new to A/F monitors, so please enlighten me.

Innovate LC-1 here, too. You can data log and I have the analog meter mounted inside. It's a little bit easier to see trends rather than trying to read and decipher digits on the fly.

408 Nova wrote:Appreciate everybody giving me advice.

How much ET and speed has anyone ever tuned out of your cars using an air-fuel ratio monitor? Are they worth it?

Roots blown BBC
Reading spark plugs is a black art to me.
Before I had one, I always thought I was rich -- nope, AFR said I was lean, gave it a bunch more fuel, picked up 2 tenths.
Best tuning tool I have.

I've always liked the AEM ones. I use them on several cars. Great features including multi channel / multi sensor for more accuracy in FI systems, triggering options, and so forth. Their newest failsafe style system is nice too and adds in some automated protection if that is of use in your application. Their stuff is very accurate and has never let me down.

http://www.aemelectronics.com/wideband- ... ystems-15/

cuslog wrote:

408 Nova wrote:Appreciate everybody giving me advice.

How much ET and speed has anyone ever tuned out of your cars using an air-fuel ratio monitor? Are they worth it?

Roots blown BBC
Reading spark plugs is a black art to me.
Before I had one, I always thought I was rich -- nope, AFR said I was lean, gave it a bunch more fuel, picked up 2 tenths.
Best tuning tool I have.

I am at a loss on reading plugs also.

No matter what jetting change I make on my carb, the ETs stay the same. I was at the drag strip the other day and was going to put an 88 in the secondaries. My son was helping me, and, unbeknownst to me, he handed me a 98 on accident. The speed and ET didn't change. I didn't notice the mistake until the next jet change.

I bought the Daytona Sensors WEGO III single channel air-fuel ratio monitor with data logging.

I am very curious to see where my air-fuel ratio stands. I'm hoping to pick up at least a tenth!

408 Nova wrote:

cuslog wrote:

408 Nova wrote:Appreciate everybody giving me advice.

How much ET and speed has anyone ever tuned out of your cars using an air-fuel ratio monitor? Are they worth it?

Roots blown BBC
Reading spark plugs is a black art to me.
Before I had one, I always thought I was rich -- nope, AFR said I was lean, gave it a bunch more fuel, picked up 2 tenths.
Best tuning tool I have.

I am at a loss on reading plugs also.

No matter what jetting change I make on my carb, the ETs stay the same. I was at the drag strip the other day and was going to put an 88 in the secondaries. My son was helping me, and, unbeknownst to me, he handed me a 98 on accident. The speed and ET didn't change. I didn't notice the mistake until the next jet change.

I bought the Daytona Sensors WEGO III single channel air-fuel ratio monitor with data logging.

I am very curious to see where my air-fuel ratio stands. I'm hoping to pick up at least a tenth!

When you make big changes in fuel tune up and see no change in performance it can be telling you there is an underlying issue/restriction. Jetting unresponsive for example? I'd insure my pump, filter, lines, etc are supplying sufficient fuel to the carb. My 2 cents.