How much of an advantage is Open Driveline?

How much weight would it take to even out.

  • Total voters
    44
JerrodGlover

JerrodGlover

Pulling God
Joined
Jun 18, 2006
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2,122
Just looking to see what others think on this. What do you think would even the playing field between a truck with open driveline ie, Drop Box, Reverser, and Rockwell over a OEM driveline truck. Lets assume that both trucks would be in a 3.0 turbo class.
 
400lbs about the make up the trans weight difference, to many variables in the rear end weights a sheet metal one will be lighter, but a non sheet metal one will be same weight or more the main difference is the hitch set ups
 
Why does it matter if the rules dont allow it any way?



I'd say you better just build a 2.6 truck.bif
 
I would say the best advantage is the lack of breakage so much cheaper in the long run
 
I have been told a oem drive line truck needs 100-200 hp more,to compete with a open drive line truck??trans and transfer robs more hp then, drop box and reverser??????? better gearing with a rock well??? I guess it could add up.My $.02 is 3.0 and bigger=open driveline.400 lbs should level it up
 
Besides cost gear ratio changes is what I'v seen with the gas guys b nice to change 1 point in the pits
 
I don't beleave that about the rockwellif any it should take a small amount of more HP.

Dale
 
Fair would be to drop the weight on every truck to keep the oem stuff from breaking and the more hp open drive line trucks would spin more.

Like said though when you get it figured out with a profab box you can change your ratio by 1/2 a point in about 3 minutes. So reading the track and knowing your truck will make a big advantage.
 
I vote no need for weight difference, no need to penalize those with a heavy driveline just because we have no rules on the 2.6 class and its come to the point where the 2.8 class is pointless. Get the rules back how they were a few years ago and this all goes away.
 
I think if its 3.0 you can't penalize the open driveline trucks. After all it is their class. Now if you were to allow open drivelines in a 2.8 with a penalty then maybe. I also think that EVERY oem driveline truck has to agree to it. Or at least a very large majority of them. Cause that is their class. I don't know but my opinion is the gearing choices aren't much if any of an advantage. Its more of a durability thing for them. I think the only reason they go to them is to keep from breaking over and over.
 
2Tone12V said:
I think if its 3.0 you can't penalize the open driveline trucks. After all it is their class. Now if you were to allow open drivelines in a 2.8 with a penalty then maybe. I also think that EVERY oem driveline truck has to agree to it. Or at least a very large majority of them. Cause that is their class. I don't know but my opinion is the gearing choices aren't much if any of an advantage. Its more of a durability thing for them. I think the only reason they go to them is to keep from breaking over and over.
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Agreed! Just by putting open driveline under a truck doesnt make it go down the track any better then a OEM truck. Where the difference lies is under the hood. If you took a motor that wouldnt bust a OEM driveline and put it an an open truck there wouldnt be any difference in footage but the other way around taking a hot open motor and putting it back the stock driveline would result in carnage. Its also got to do alot with setup and how rears, ect. are attached to the frame vs running springs and how they attach to everything, so by putting a 106 under it does it make it perform better, no, does all the things needed to fab a 106 under a truck help it, yes. can you do that same thing to an D80, yes. Other then weight the reverser is 1:1, does it make it go down the track any better then a NV4500 in 4 gear which is 1:1, No. Same for a dropbox other then being able to change gears slightly it doesnt fisically make the truck go down the track any better. But 99% of the open driveline trucks have been engineered for one thing and thats to go 300' the best way they can. The OEM drive line trucks are still designed to run up and down the road but we are using them in an application they were not completely made for, until you can get under them and cut and weld pieces that make them more suited for what we do with them they are still hindered by the the stock attachment points as well as motor $.02
 
Aren't you still spinning the gears and all inside the transmission, even if your not using all of them? That does eat HP.
 
True but not as much as an auto, but so does power steering, fan, alternators, ac even if its not on it still drag on the belt which takes power. I forget what they say % you loose through the driveline.
 
We have been talking about this at our club. Right now we have a 3.2 twin charger/unlimited single but stock drivetrain and some want to take it back to a 3.0 single. Then many want to be able to add big drive train parts as they break. This is mainly because we don't have alot of manual tranny trucks around here and most up to last year were still street driven.. Instead of spending money to rebuilding the auto trans we want to be able to up grade to a drop box or big rear end. We have been hearing that there is around 20 feet in in the drop box reverser. There is talk about making the open driveline trucks pull at 7500 and stock at 8000. The problem I see with that is the stock drive lines have more weight and will be a lot more likely to break so most trucks will end up switching to open. Then when do you switch the class to 8000 for everyone. This is our club to grow into a open 3.0 class and have a 2.6 class for the guys that don't want to grow.
 
I think in the ITPA's situation is that not all of their current 2.8 truck are going to or want to go to open drive line. But if they put in the rule to allow them.

Basicaly, they are seeing if there is a need to handicap the trucks that throw the open driveline behind their 2.8 motor.


I realy dont see a problem with it, basicaly due to the MASSIVE breakage these guys are seeing each week. Plus this would allow them to throw different turbo setups on their truck and run in more classes or bigger classes if they want. I think its the way they should go, and would make for a more entertaining pulling season!!!!
 
DISTURBED said:
Agreed! Just by putting open driveline under a truck doesnt make it go down the track any better then a OEM truck. Where the difference lies is under the hood. If you took a motor that wouldnt bust a OEM driveline and put it an an open truck there wouldnt be any difference in footage but the other way around taking a hot open motor and putting it back the stock driveline would result in carnage. Its also got to do alot with setup and how rears, ect. are attached to the frame vs running springs and how they attach to everything, so by putting a 106 under it does it make it perform better, no, does all the things needed to fab a 106 under a truck help it, yes. can you do that same thing to an D80, yes. Other then weight the reverser is 1:1, does it make it go down the track any better then a NV4500 in 4 gear which is 1:1, No. Same for a dropbox other then being able to change gears slightly it doesnt fisically make the truck go down the track any better. But 99% of the open driveline trucks have been engineered for one thing and thats to go 300' the best way they can. The OEM drive line trucks are still designed to run up and down the road but we are using them in an application they were not completely made for, until you can get under them and cut and weld pieces that make them more suited for what we do with them they are still hindered by the the stock attachment points as well as motor $.02
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Well said Anthony and Jeremy.I think no one should be penalized.

Dale
 
lubeowner said:
We have been talking about this at our club. Right now we have a 3.2 twin charger/unlimited single but stock drivetrain and some want to take it back to a 3.0 single. Then many want to be able to add big drive train parts as they break. This is mainly because we don't have alot of manual tranny trucks around here and most up to last year were still street driven.. Instead of spending money to rebuilding the auto trans we want to be able to up grade to a drop box or big rear end. We have been hearing that there is around 20 feet in in the drop box reverser. There is talk about making the open driveline trucks pull at 7500 and stock at 8000. The problem I see with that is the stock drive lines have more weight and will be a lot more likely to break so most trucks will end up switching to open. Then when do you switch the class to 8000 for everyone. This is our club to grow into a open 3.0 class and have a 2.6 class for the guys that don't want to grow.
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NOT TRUE... You save MAYBE, AT MOST 5% horsepower in a drop box reverser...on a 3.0 single conservatively making 900rwhp on stock driveline, that would be 945rwhp on an open drive truck..... 45 hp does not make up 20 feet, 5-10 feet is because of the drop box, the other 10-15 foot difference has to do with the hitches that the clubs run on the 3.0 open driveline trucks. A pulling style hitch attached forward of the axle makes a huge difference, we have a gas truck that pulled well in the "stock" class, but in the "Altered Stock" class (which we were comparable on power with some), we did not finish near some of the equal powered trucks, usually 10-20 feet. The only difference was the way the hitches were built.$.02 Once again, these gassers were all manual tranny trucks. Automatic will cost you an extra 2% on top of a manual.

My yellow truck dynoed 948rwhp uncorrected on a superflow dyno with my twins this last spring, i think it was approx. 978 corrected, that was through an Allison, with power steering, and with A/C on the truck.....stuffing it all through the stock intercooler...:rockwoot: I have rewelded the intercooler 3 times due to leakage!LOL

Now if I put that motor in an open driveline truck, with a pulling style hitch, with an air to water intercooler, and got rid of all the accessories........My truck would gain 20+feet conservatively speeking....probably closer to 40 feet!
 
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