Car gearing and weight effect on tuning

[JETFAST]

How many have sent a "spec'd" converter back for a re-stall because it's to " tight " and not loose enough? 2-3 times? Tried 2-3 different companies, and still cannot get a converter "loose enough" to work for the combination, to find a different companies spec'd converter does the same thing, or even act the same way...to tight? I see this scenario repeated over, and over. All the while using the converter as the excuse...being to tight...for the reason why their car is so slooooow.

Lot's of critics like to blame the converter guy, for their lack of tuning knowledge, when it comes to dialing in their combination. Usually the tune up is wrong...carb(s), EFI, ignition, cam timing, fuel system, gearing, trans fluid pressure, viscosity, ect. Most cases the converter is not the problem, it's usually the "loose nut" behind the steering wheel.

You can tune a converter to slip more, and you can tune a converter to slip less, without even removing the converter from the car. Most have a hard time understanding such possibilities.

Some like working on their cars, others like to race them.

[HarrysTaxi2]

[GTO Geoff]

Leaner jetting in the loose c'ter?

[JETFAST]

The higher the load the more fuel required to make torque. A loose converter with low torque multiplication is not going to burn much fuel, or make very much torque, just slip more, and burn less fuel in the process.

[Right hand drive]

A hypothetical.

You hook a trailer to your car and cruise down the hi way. Hi way speed with cars gearing engine revs at 2500. Let’s say it takes 100ft/lb to maintain that speed. It’s a manual so no torque slip to consider. To maintain that rpm the throttle is open 10 degrees. You get to your destination, load the trailer up with whatever, sand gravel, new race car. On the return trip on the hi way with the extra load it takes 200ft/lb to maintain the 2500rpm for hi-way speed. The throttle is now rotated further open. With the empty trailer the engine needed very little fuel and air regulated by the throttle to produce 100ft/lb and it does that at 15:1 AFR. On the return trip the throttle will be open more because it needs a greater volume of fuel and air to produce 200ft/lb so the throttle is open further.

Can the fuel be 15:1 AFR on the return trip or does it have to be richer than that now load has been added?

[JETFAST]

Go hook up the trailer, and find out. That motor is only going to complain, if something is wrong.

[Right hand drive]

[HarrysTaxi2]

[Right hand drive]

[JETFAST]

I am at the track…somewhere… damn near every weekend. Going rounds In Ardmore OK right now. Where you two fools at today? I tune around people like y’all all the time. Not much either of you could tell me, that I do not already know. I typically learn something new everyday…including this last round. Keep hypothetically guessing for yourselves. Makes no difference in either of you spectacles…kicking rocks….. hypothetically speculating ….for your own lack of schooling and knowledge.