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Need some drag racing advice

 
Old 02-07-2019, 12:41 PM
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The ecoboost trucks are different. They build boost so they're hilariously faster off the line when you stall them up.
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Old 02-08-2019, 02:55 AM
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Originally Posted by w00t692 View Post
The ecoboost trucks are different. They build boost so they're hilariously faster off the line when you stall them up.
Thanks that's what I thought but wasn't sure how high of rpm do you launch your Eco Boost truck at?
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Old 02-08-2019, 09:12 PM
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Originally Posted by Threeper88 View Post
So not having raced trucks before, curious about something.

Launching in 4 high and the front not disengaging till after your run,... would this not be pretty hard on your 4wd system?

Was always under the belief 4wd should not be used over 45-55 mph and these drag runs are finishing around 100 mph on dry pavement.
As long as you are going straight, and your tires are about the same size, it's a non issue. When launching in 4WD, you are splitting the torque 50% each way, probably easier on most parts imo. The harm you could do would be shifting in or out of 4WD at full power. The launch is by far the hardest on the truck, after you are out of 1st, torque drops off by 30% or so, and is pretty much a total non issue.
Nowhere near as much torque going through the diffs in 4 high, even with a nitrous launch, as there is full throttle in 4 WD Low.
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Old 02-08-2019, 09:28 PM
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The diffs are a none issue, very robust especially in 4wd where the torque is halved. Same with the trans, the 6r80 was bullet proof and the 10r80 isn't far behind. For me the biggest fear is grenading the transfer case. Every time I launch in 4HI, I'm listening for two things....the sound of a rod punching a hole in my block and the sound of my transfer case littering the ground with its guts. A close third would be the sound of a u-joint shattering like glass.

Fortunately there are plenty of trail blazers who've run into the low 10's with a near stock driveline without too much fuss. Has anyone broken a transfer case in a drag racing setting?
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Old 02-08-2019, 09:32 PM
  #35  
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Originally Posted by BadCon View Post
The diffs are a none issue, very robust especially in 4wd where the torque is halved. Same with the trans, the 6r80 was bullet proof and the 10r80 isn't far behind. For me the biggest fear is grenading the transfer case. Every time I launch in 4HI, I'm listening for two things....the sound of a rod punching a hole in my block and the sound of my transfer case littering the ground with its guts. A close third would be the sound of a u-joint shattering like glass.

Fortunately there are plenty of trail blazers who've run into the low 10's with a near stock driveline without too much fuss. Has anyone broken a transfer case in a drag racing setting?
Weight plays a role here also
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Old 02-09-2019, 12:17 PM
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Originally Posted by BadCon View Post
The diffs are a none issue, very robust especially in 4wd where the torque is halved. Same with the trans, the 6r80 was bullet proof and the 10r80 isn't far behind. For me the biggest fear is grenading the transfer case. Every time I launch in 4HI, I'm listening for two things....the sound of a rod punching a hole in my block and the sound of my transfer case littering the ground with its guts. A close third would be the sound of a u-joint shattering like glass.

Fortunately there are plenty of trail blazers who've run into the low 10's with a near stock driveline without too much fuss. Has anyone broken a transfer case in a drag racing setting?
Most supercharger guys don't have to worry, I have probably 1000 nitrous launches (which have glorious bottom end torque lol) with a 100- 125 shot, literally have put over 300lbs of nitrous through it, (lots and lots of stoplight launches, it's addictive barking all 4 tires and leaving 4 lines 100 ft long (and as of this point, no breakage, no noises. Approximately 20 150 shot launches and half a dozen 200 shot launches. I use a controller, but essentially a 1/2 second ramp just to allow the converter to flash. These trucks are very stout.
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