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A dewitts should handle your set-up easy. 68* and no A/C running? It's easy to suggest more cooling such as an external cooler for the transmission would offload some of the heat or a separate engine oil cooler.

If your highway temps come down after a WOT blast from 60 - 100 mph, then you have adequate cooling capacity. I think you have an install problem. First I would verify the fans are wired correctly. Make sure the fans are both running at full speed; you could have a blown fuse, relay, melted wire, or other issue and only be running one fan. Next verify that air from both is flowing the proper way. Go out with a sheet of paper and slide it next to the radiator while the fans are running and see how the air pushes/pulls the paper. If one is out of phase, or both are reversed, you won't get any real cooling. This is easy to miss because the fans look like they are working, but in reality are fighting each other. Finally check for any blockage or anything restricting airflow.
 

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It is easy to blame it on the higher stall, but there are blower cars out there with a 3000 stall and no problems. I do agree they all have external coolers. No doubt it contributes but IIRC the A6 uses lock up starting in 3rd gear. The extra rear gear actually reduces the amount of slip required on launch too. Did your tuner change any of the lock-up settings? If they are MPH trigger, with your gearing you may not be locking up as much as you should under light throttle conditions.

Just curious, have you measured your stall speed with the blower? A converter rated for 3200 behind an NA motor should stall much higher with the big bump in torque from your blower. Stock stall doesn't hurt as much on an eforce since it is PD and makes a lot of torque down low. The launch won't be as easy to modulate as with the 3200, but you will still be fast off the line with your gearing and torque.

You are the only one I've heard run 4.10s with an A6. That's a lot of gear.
 
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