Need a few tips(4wd launch, etc) - Ford Powerstroke Diesel Forum
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Old 05-20-2009, 06:17 AM
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Need a few tips(4wd launch, etc)

Ok guys...

A buddy and I went and scoped out a local drag strip lastnight. It's a decent strip, and only maybe 35 minutes away.

I want to maybe run my F250, make a pass or 2, and just see how it does. I know Blaine, the previous owner, ran it at the Indy Diesel Nationals, but he said it was sweltering hot there, and thought just cooler air temp MIGHT knock a little time off.

Questions..
1. Its got the ttb suspension with Dana 50. The truck has 4.10 gears. Should I consider running it in 4wd for a better launch? I will make my first pass in 2wd a little light on the pedal, and see how it hooks first. The truck is on 285's. But.. if I cant hook well, would the Dana 50 be ok in 4hi?

2. What RPM should I try launching at? The truck is an auto. It has a QSSB turbo on it, should I focus on boost or RPM's during the launch?

3. The truck has "traction bars" on it. What I mean is that it has the tubing that can drop down and allow only about an inch of rear suspension travel. Should I drop those down and use only 1" of travel, or not bother and leave them up and out of the way?

4. After a run, should I leave the truck running, to cool the turbo down before I shut it off? I've heard alot of people talk about doing this with turbo engines, but I wasn't sure.

5. I've read threads that say not to expose the turbo to temps over 1200F for very long. I'm not real sure what temps I might reach at full fuel, but for a few quarter mile passes, about what temp might be ok to hit during the run?
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Old 05-20-2009, 06:23 AM
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This is what I would do. 1st run launch in 2wd. Then the 2nd run launch in 4wd.

Which ever gives you the best run is the way to go.
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Old 05-20-2009, 06:33 AM
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Ok but do you think the Dana 50 will be ok with that?
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Old 05-20-2009, 06:35 AM
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Quote:
Originally Posted by Freddie View Post
Ok but do you think the Dana 50 will be ok with that?
Yes as long as you don't turn in 4wd you will be fine. After the launch you can shift out of 4hi back to 2wd. The hubs and the driveshaft will still be turning because the hubs will stay locked in. But the t-case will go back to 2wd. You should do this before you reach 50mph.
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Old 05-20-2009, 06:37 AM
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Ok, keep in mind I have a manual transfer case. I know I'm not supposed to shift into 4wd on the fly, but is it ok to shift out of 4wd on the fly? I dont know if I can reach down to the floor to do that while driving......
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