Help with a converter

[hardtimes]

If your converter flashes 5200 with a 4.33 gear and you swapped to a 4.71 how much would that tighten the converter up.

[Mark Yacavone]

Originally Posted by hardtimes

If your converter flashes 5200 with a 4.33 gear and you swapped to a 4.71 how much would that tighten the converter up.

Technically zero. Static flash stall would be the same, but I know what you mean.

It MAY act a bit tighter off the line, but how much? Some ..maybe

Anybody that tells you more specifically than that is just guessing.

[Adger Smith]

What Mark is saying is converters react to load. Static is always static, but at the initial car move the load on the converter is different due to the gear multiplication. It is more apparent with gear changes in the tranny than rear gear changes. Too many variables to guess. That is what data logging and testing is for. If you change the gear and don't pick up it might not be the gear ratio that doesn't work. It might be the converter doesn't like the less load of the steeper gear. Talk to "Your" converter guy. He should know how your converter is built and should be able to give you a SWAG....

[hardtimes]

Let we ask another question. If you have a converter and it is to loose for your combo, and your put the right converter in.
Would your 60ft pick up or slow down.

[Mark Yacavone]

Originally Posted by hardtimes

Let we ask another question. If you have a converter and it is to loose for your combo, and your put the right converter in.
Would your 60ft pick up or slow down.

If by the right converter , you mean it flashes right around peak torque, then yes, it should pick up some ET.
That is with everything else being up to snuff...Suspension, carburetion, etc.

[Jim Bailey]

Hardtimes: exactly why I quit worrying about 60' times years ago. ....My car will 60' like crazy when the convertors too loose. I set my cars up using 330' times. - JB -

[ATI Performance Products]

Originally Posted by hardtimes

If your converter flashes 5200 with a 4.33 gear and you swapped to a 4.71 how much would that tighten the converter up.

We have found in our own testing with the Challenger that each rear gear ratio change is roughly 150 rpm, when all else remains equal. So you could be as much as 300 tighter.

I changed converters in the same day on back to back runs. The quicker one showed nothing gained in the 60ft. It was all down track. In fact the car pitch rotated less off the line and showed less Gforce on the Racepak on launch. Food for thought. The race is not to the 60ft😃