Cummins V/S Duramax

[KOUNTERSC]

I got a power edge ez via ups today. While I was installing it, a buddy of mine with a chevy duramax saw my hood up and stopped to rag me on my suspected problems. He helped me install it and wanted to see what the difference was. We never raced before because I knew I would lose. We went down the road to a black-top road that nobody travels. This road is marked all over the place by the motorcycle riders that want to see how far they can ride a wheely. We found a spot that looked to be marked off as a quarter of a mile (2. 5 on the oldometer) and lined up. He said since I had the advantage with the module, He would start first, and when I saw him move it was on. I saw his back bumber right away on the start. I picked up a little distance along the way. At what we think was the quarter mile mark, I was at his front wheel well opening.

I lost the race. When I asked him how fast he was going at the end, we were about the same, just a hair under 90 mph.



He has a Chevy 2500HD extended cab 2WD duramax with 3. 73 and auto transmission and I have a Dodge 2500 extended cab 2WD cummins with 3. 54 and auto transmission.



Ant't no telling who will be ragging me tommorrow over this.

 

[Barry]

Don't let him see you drop in the 275s... ... ... . I bet if you would do a little work on the trannie that would solve the problem.

 

[Archive]

I am helping to install a set of DD3s for a guy tomorrow morning. He is removing a good set of 275s... if you are interested, I am sure he would make ya a good deal. I have seen the used ones go for 175-200 dollars. Post if you are interested and I will show him your post.

 

[EMDDIESEL]

You have to do a rematch, do you have the 4" exhaust yet?, i ahve an EZ and that and i clobbered a Jetta on the highway.

 

[jwdeeming]

Rerun the race, only this time with an EVEN start. Any drag racer will tell you most races are won or lost on the starting line. Using his movement as the green light is a HUGE disadvantage to you, particularly in a turbocharged engine. You want that tubo as far into boost mode as possible before you ever start off the line.



Go practice your launch somewhere for awhile and then race him with an "even" start. That should level the playing field nicely.



Speaking for my "almost stock" truck, the best launch is to let off the brake as the tachometer is flying through about 1600 to 1700 RPM. At that time the the boost is approaching 10psi and will quickly fly up to 20 and give you the best seat-of-the-pants feeling (provided you don't lose traction and boil the tires).



That truck-length hole-shot off the line can be the end of the race 1/4 mile down the road. My wife beats me every time in her V-10 2500 because of that line launch that my stock diesel can't match.



Have fun!

JimD

 

[catoiler]

Can you say NOS he he

 

[work2muchplay2little]

Try going on the count of three; each of you counting with your hand held up for each other to see. Best way I know outside of another person, or better yet go to the dragstrip and get those official times.

 

[Steve M]

What could be better? You both have great trucks! The local drag strip is your best bet. For a small fee and a helmet, you can run in the fan participation class and get real ETs for both trucks. Don't indulge in the water burnouts. Your transmission will suffer. Even the Allison will file for divorce if mistreated. Only 5 seconds of stall spd burnout can cook your transmission fluid. So said the transmission mechanic while he was rebuilding my C-4 in my 302 powered '71 Comet GT.

I used to run in fan participation and ended up working in the ET shack at the end of the strip. It was alot of fun.

 

[Barry]

I have been thinking about your situation. Your truck came with 235 HP. Assuming they are 90% correct that would yield 212 HP. The EZ is touted as 65 HP and assuming they are 90% correct that would yield 59 HP. The total(and I think this is optimistic) should be 271 HP. The Dmax is suppose to be 300 HP and with a much lighter engine and body. The Dmax is a quick wind short stroke engine hooked to what is suppose to be the finest OEM auto trans available. All in all, I'd say your little Come-a-long made an outstanding showing. To me, the real test is to go hook them both to the same loads and head for the Miss. or Sunshine bridge and see which one gets to the top first.

 

[Sky]

I was just going to say the same thing. Try 2 tests:



1. Try a speed from about 45-50.



2. Hook up some wieght and pull a grade. Make sure your trucks and the load weight the same.

 

[HC]

Compare your $$$ spent to date.

 

[chrgr446]

Try this , get a 15' length of chain and tie the trailer hitches together in two wheel drive keep your rpm around 1700-1800 you will hold him back , and as your tires blaze wack the throttle and laugh as you pull him backwards.

 

[Gary - K7GLD]

Quote:



"Try this , get a 15' length of chain and tie the trailer hitches together... "





UH - OHHhh - yet another who confuses TRACTION for power...



SO, in the above scenario, ONE guy places 500 lbs. of cement over his rear axle - who wins NOW? Is it because of the "extra power" the concrete provided? IF so, maybe *I* should start an aftermarket "performance" business selling "power enhancing" cement blocks!

 

[chrgr446]

OK so make the weights equall, remember torque is what moves things. If weights and traction are equall ( you should both be on the same surface right?) the torque of the modified Cummins should win out. Aren't we just a little sarcastic with the concrete block thing? I suppose you've never even been involved in a truck pull, it's an awesome sight and sound! PS I don't confuse traction with power, after 22 years of building, tuning, and racing (see signature) I think I know the difference.

 

[Gary - K7GLD]

quote:



"PS I don't confuse traction with power, after 22 years of building, tuning, and racing (see signature) I think I know the difference. "





UMMMmm - then you should ALSO know that hooking 2 powerfull trucks back-to-back, and applying throttle will do LITTLE more than result in LOTS of wheelspin and tire smoke = "proving" absolutely NOTHING!



There's precious little comparison, using the law of physics, between a SINGLE power source pulling a fixed load, and 2 OPPOSING forces pulling in OPPOSITE directions - and even in tractor pulls, the win is obtained far more on the basis of momentum and TRACTION than it is on power alone! Get an object MOVING, maintain TRACTION, and you can accomplish a lot - but gobs of power, either a SINGLE source against a load, or 2 power sources against each other, and without proper TRACTION, all you end up with is wasted motion - and usually worthless SMOKE.



It's in the physics books - back-to-back demonstrations may LOOK impressive, but prove LITTLE about "comparisons" of available POWER!

 

[chrgr446]

So two duallys on the same street, very close in weight, same tire size,and rear gear ratio, both with lots of tire smoke(and ruts in the street), but one manages to pull the other 15' backwards,only proves better traction?

Power has nothing to do with it?

How about a Geo tracker vs a Cummins, the tracker probably could not spin the tires(good traction) but the Cummins would spin and pull (kind of an exteme example). Not trying to have a ******* contest here but, I still think power has something to do with being able to pull a load, whether stationary or against another movable object.

 

[Gary - K7GLD]

quote:



"I still think power has something to do with being able to pull a load, whether stationary or against another movable object. "



I wouldn't disagree a bit!



What I *DO* disagree with, is the quaint notion held in some small towns by folks named "Billy Bob", that the best way to PROVE power is to hook 2 trucks back-to-back and see which one can pull the other one backwards - especially when BOTH are wildly spinning their tires!



All things being equal, I can pretty much guarantee you the truck spinning his wheels the MOST (more wasted power!) will ALSO be the one getting drug BACKWARDS! Not particularly because of LESS power, but because of less TRACTION, or ability to get the power to the pavement!



Can we at least agree that there ARE better, more ACCURATE ways to demonstrate power than the above examples?

 

[chrgr446]

YES there are MUCH better ways to prove how much power, not too many better than the good old drag strip, the clocks don't lie. But it's still pretty cool to see two modified diesels duking it out, tires blazing, black smoke beltching, eyes watering, rubber flying, neighbors calling the cops with thier cordless phones, cops driving by through a fog of tire smoke, and not stopping. Oh, sorry I got carried away, it's all in good (clean?) fun, anyway.

Look, it was a Powerstroke, he called me out, what was I supposed to do let all my Mopar friends down?(good thing I had better traction!)



Speaking of traction, look at the MPH figures on my signature for the Charger, compare them to the ET and you will see I am well aware of what lack of traction does to ET's. With those MPH #s if the car was hooking it would run very close to the 10's. I just don't want to cage and tub an original R/T, so I just go and run what it runs, and have fun!!!!!!!

 

[jstyer]

Advantage???

I have been thinking about your situation. Your truck came with 235 HP. Assuming they are 90% correct that would yield 212 HP. The EZ is touted as 65 HP and assuming they are 90% correct that would yield 59 HP. The total(and I think this is optimistic) should be 271 HP. The Dmax is suppose to be 300 HP and with a much lighter engine and body. The Dmax is a quick wind short stroke engine hooked to what is suppose to be the finest OEM auto trans available.

Next time don't let him bulls**t you about the EZ being the advantage based on the math above. If anything, based on this, he should have given you the head start and had to catch you. Heads up at the strip is the way to prove who is "better".