SS4200 efficiency?

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Jun 29, 2004 | 11:53 PM

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From: NW Indiana

SS4200 efficiency?

does anyone know what percent efficiency the SS4200 has from 5000-7000rpms?

thanks

Jun 30, 2004 | 07:58 AM

JNorris

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From: Montgomery, AL

Though I am no expert I would estimate efficiency to be between 80%-90% from 5000-5500, and 85%-90% between 5500-6000, and greater than 90% above 6000. This will also be dependent (to a small degree) on your rear gear selection. The numerically lower the gear the less efficient any converter will be.

Jun 30, 2004 | 08:03 AM

Ragtop 99

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if you plan to spin to 7000 rpm, I would get a PT4000 or 4200. Yes it will be looser, but it will be very efficent in that range.

Jun 30, 2004 | 11:39 AM

Colonel

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From: Troy, AL

Mike tells me that 4200 is as far as he wanted to push the SS line for efficiency reasons. It would be the perfect converter if you REALLY *needed* the extra 200 RPM SE over the 4000 converter (otherwise go with the 4000) but still needed that extra degree of streetability over the PT.

Me? Once I go further than the SS4000, in terms of streetability, I say to heck with it and get a PT4600 and a set of 4.10+ gears with slicks. If it's to be street driven on a daily basis, the SS4000 is as good as it gets, IMO (just speaking from *my* preferences.)

Jun 30, 2004 | 11:42 AM

Colonel

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From: Troy, AL

JNorris, brings out some good points we should all keep in mind when discussing converters, efficiency is in large part dependent on what RPM we're talking about and is influenced somewhat by HP, weight, and gearing.

Yank rates their efficiencies at 6000 RPM I believe.

Jun 30, 2004 | 12:55 PM

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From: NW Indiana

thanks for replys guys. I already have this converter and was trying to figure out what rpms I was going to be running with my new gear/tire combo and I want to try and keep it below 7000 at the traps if its all possible.

As for this converter overall, I absolutely love its street manners and its pretty good at the track too.

But, every once in a while I still do miss my old PT4400.

so for my rpm range calculations will I be good with figuring in about 6-7% slip from 6500-7000? BTW I'll be using a 4.30 gear w/ a 27" tire

thanks,

Jun 30, 2004 | 02:11 PM

Colonel

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From: Troy, AL

Yes, 6-7% would be a safe guess at those RPMs.

You could lock the converter at high RPMs in 3rd to give yourself more breathing room. That's what I'd do.