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Stock. Read post 1-3 for details.
DT Headers Dyno Result Thread (3 Viewers)
- Thread starter RobRed
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Stock. Read post 1-3 for details.
Really? So you don't ever use 4L?
2500-4000 is a totally reasonable and usable range in the lower gearing, and WOT is not at all uncommon on climbs and at altitude. There are apparently some real and accessible torque gains to be had offroad as well if the data are accurate.
Don't be mesmerized by the peak numbers. Sure 12 ft/lbs improvement at ~ 32-3300 rpms is good but look at the difference a 3k! It's probably very close to double that with a 20+ ft/lb gain at the wheels. That's nothing to sneeze at for a stock ~ 300 ft/lbs at the engine. The torque is pretty flat from 3-4k now as opposed to falling off steadily from 3.3k on the stock curve. Also look at the bump around 4200, that looks to be a 25 ft/lb gain there. You can easily run steady at +4k in 4H/2nd on long climbs up steep passes.
Granted though this is for a 2000 without VVT or a 5sp so as always YMMV. Would be interesting to see some comparos across years. Perhaps more people will be encouraged or if DT sells enough sets they'll do their own. Always prefer to see non-sponsored dynos though.
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It's extremely rare that I would be at WOT on the trail. Just not my type of driving. And the few times I've had it all the way down it's been with severe ATRAC intervention which is retarding the throttle anyway. Spent last weekend in the 5-7,000 ft range and even on inclines steep enough that the truck slid back down under braking I was at partial throttle in 4L with 35's.
Where I do, however, find myself at WOT is back on the highway to/from the trail where I'm trying to maintain speed or merge. There it's a numbers game and the expanded torque curve is welcome.
If you're into bashing through mud pits or blasting through snow drifts then I agree that full power would be required. It's also a good way to damage a rig. Again, not my style. Flame suit on.
I rarely ever see close to 4000 RPMs on the trail in 4LO.
I'm not talking about bashing around, catching air or anything like that but I know of a few climbs where starting out 2nd low, if I don't floor it on the approach (and topping 4k RPMs in the process) that the truck will bog and just run out of guts before running out of traction.
Then when you've lost momentum and traction and try to do a hill start is where you break trucks. Or roll them backing down. I'd rather make the crest the first time. Just sayin'
Then when you've lost momentum and traction and try to do a hill start is where you break trucks. Or roll them backing down. I'd rather make the crest the first time. Just sayin'
Again, it's not about the "peak" power and torque, it's really about the increases across the curves. That should be a nice little improvement for driving up hills at speed or towing.
Great info!! Thanks for making this happen. I have my set, just need to find the time to put them in. My passenger side cat needs to be replaced, so going to do the headers plus exhaust upgrade VERY soon.
says who?
No s***
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wildsmith
SILVER Star
I don't have DT headers but this thread is still interesting to get an idea what sort of numbers the pacemakers I have might be giving me so thanks 
I changed the whole exhaust at the same time as fitting headers so maybe I picked up a bit more torque but it's quite noticeable at low throttle settings pulling up some hills that the torque converter is less likely to be unlocked to keep the momentum up and thrashing it to overtake gives sharper performance.
I changed the whole exhaust at the same time as fitting headers so maybe I picked up a bit more torque but it's quite noticeable at low throttle settings pulling up some hills that the torque converter is less likely to be unlocked to keep the momentum up and thrashing it to overtake gives sharper performance.Just had mine installed at DT this morning. SWEET! very happy with the added boost and butt dyno results. The headers made up for all the acceleration that I lost with the upgrade to 285/75-16 tires and then some. The guys at DT were/are awesome. I spoke to them about doing a Cat-Back for us 100 owners and he said if we can get 25 commitments / deposits that they will do it. I volunteered my 100 for the design / test fit. Don't have too many details yet, but I will pull this together and start a seperate thread. It will be after the SEMA show that they start on the build.
Thanks again for doing this Dyno thread. Hopefully, I can pay the MUD community back by making a Cat-Back group buy happen.
Thanks again for doing this Dyno thread. Hopefully, I can pay the MUD community back by making a Cat-Back group buy happen.
re_guderian
SILVER Star
Just wanted to say that this thread, and getting data to validate the benefit of the headers is awesome. I'm not sure they're in my immediate future, but good to know that some testing is going on. Keep up the good work!!!
CappyKD - get on it. For starters it should naturally cost less than the Borla system from years back but also contain the same DT quality we've come to love.
I am on it. Contacting Nick today to discuss.
Figures, 6 weeks after I got my Borla installed you guys set up a group buy.
How do you like the Borla? Any extra power or just a wonderful and throaty sound?
Borla is weak, too quiet
