Converters And STR

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Aug 27, 2010 | 09:42 AM

Tyler_PinkertonZ28

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From: Lugoff, SC

Converters And STR

I have yet another converter question:

When it comes to STR is it better to have a higher or lower number? I know that the higher the STR the higher the amount of torque is, but is that necessarily the best for a street car? The reason I ask is I am stuck between two converters both of which are 3600 stalls but one has a STR of 1.86 while the other has a STR of 2.5.

Aug 27, 2010 | 06:45 PM

skat

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From: Keystone Heights FL

I have a 2.16 STR. Mods and power in sig. I love mine but wish I had went a little mote aggressive.

Aug 27, 2010 | 06:56 PM

Tyler_PinkertonZ28

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From: Lugoff, SC

How does it feel on the road? Does it take a lot of gas to get moving?

Aug 27, 2010 | 07:02 PM

Jays_SSZ28

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A high STR is going to require more RPM to get the car moving while driving the car normally. A low STR is going to move the car with less RPM.

Aug 27, 2010 | 07:08 PM

Tyler_PinkertonZ28

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From: Lugoff, SC

ok, so the lower is better as far as getting the car to move, but the higher is better as far as the amount of torque on the ground. Do I have that right?

Aug 27, 2010 | 07:26 PM

Jays_SSZ28

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Quote:

Originally Posted by Tyler_PinkertonZ28

ok, so the lower is better as far as getting the car to move, but the higher is better as far as the amount of torque on the ground. Do I have that right?

Yes, with a high STR it'll blow the tires off easier but it might get old street driving at a higher rpm at a low mph.

There might be more to it. My converter builder told me about pump (impellar) fin exit angle and stator blade count and fin angle.

The way I understand it the stator has the most effect on STR and converter feel as far as tight or loose, and pump fin exit angle will fine tune that feel. I may be wrong on this but I watched him restall my converter with a different stator and pump with a positive fin angle and it went from too loose to just right.

If you're into cutting open junk converters you can use this chart to get a better idea of whats what. http://www.sonnax.info/announcements/STALLCHART.pdf