Author Topic: Doubles. (Read 3013 times)

skipnrocks · « **on:** Feb 05, 2008, 09:28:50 PM »

Alright Iknow yotes are not know for much power and my question is about driveline effeciency. I know you can loose quite a percent of your motors output as you gothrough the d-train. So for you guys that run duals on your dd do you notice any power/fuel effeciency changes by having the extra case.....

Yes i am aware that they are an offroad comottie (spell) and offroad they are the bomb. I am mainly curious about the guys that still drive on the road?

Thanks

ninja turtle · « **Reply #1 on:** Feb 05, 2008, 09:35:35 PM »

my buddys running a pumped 22re and when he went duals he said it felt like he lost about 20 hp. his words are that it lost its "snap".

edit: i talked to him last night, he said more like 5hp but he cant light'em up like he used too.

Rockcrawlintoy · « **Reply #2 on:** Feb 05, 2008, 09:36:32 PM »

i couldnt tell much of a difference

46&2 · « **Reply #3 on:** Feb 05, 2008, 09:38:25 PM »

I have not noticed any change in gas mileage or power since going duals. The only problem I have is at about 75 MPH i get a slight driveline vibration because of the shorter shaft and angle. that is the only downside I have noticed. Have only had them in about 3 months. I will have to do another gas mileage test to see if it changed anything. Powerwise it feels the same though

skipnrocks · « **Reply #4 on:** Feb 05, 2008, 09:45:45 PM »

Cool thanks guys! It would be cool to see a dyno on it! Starting at the plain motor, then adding stock d-train and then doubles.

94MtnYote · « **Reply #5 on:** Feb 05, 2008, 10:23:59 PM »

Good idea,

wish I woulda dyno'd before I put the header on

skipnrocks · « **Reply #6 on:** Feb 05, 2008, 10:25:23 PM »

Does marlin have a dyno?

kneedownnate · « **Reply #7 on:** Feb 05, 2008, 11:09:06 PM »

Nope, but there's supposed to be a good shop in fresno with a well set up dyno.

Hammerhead · « **Reply #8 on:** Feb 05, 2008, 11:41:49 PM »

Didn't notice a difference...

lilbuddy · « **Reply #9 on:** Feb 05, 2008, 11:42:38 PM »

When I did it in my 81 I noticed a good difference and when I did it in my 86 i only noticed a slight difference.

SLIVER · « **Reply #10 on:** Feb 06, 2008, 07:21:08 AM »

My tired 4runner had 52 hp before duals( just a guess), Now with duals it has an even 50 hp.
No matter what there are still just 4 tiny squirrels powering my machine.

))--SLIVER-->

79coyotefrg · « **Reply #11 on:** Feb 06, 2008, 09:32:27 AM »

i noticed no difference at all, if the gear boxes are really cold, like when i had to go get my brother in Minnesota, then yea it seems to lose some but after everything was warm again it ran just as strong as it always had

88_Pathy · « **Reply #12 on:** Feb 06, 2008, 09:35:28 AM »

There is a dyno shop right around the corner from Marlin though.

bigarms23 · « **Reply #13 on:** Feb 06, 2008, 12:36:41 PM »

at first i noticed that it wasent my duals robbing power it was in fact a too high set of ring and pinion gears once fix didnt notice i am running the v6 engine though

jimbo74 · « **Reply #14 on:** Feb 06, 2008, 12:52:47 PM »

Quote from: SLIVER on Feb 06, 2008, 07:21:08 AM

My tired 4runner had 52 hp before duals( just a guess), Now with duals it has an even 50 hp.
No matter what there are still just 4 tiny squirrels powering my machine.

))--SLIVER-->

where did you get these numbers? i honestly dont think you have 50 hp..... my lawnmower has 5hp.....

Duffil · « **Reply #15 on:** Feb 06, 2008, 01:14:44 PM »

When I went duals it *seemed* to lose a little bit of power, but it wasn't bad. I still have the same mileage.

skipnrocks · « **Reply #16 on:** Feb 06, 2008, 02:59:55 PM »

Sounds like not too much of a differance then, maybe depending on the tiredness of the motor. Thats cool especailly for those that are using it as more than a trail truck.

SLIVER · « **Reply #17 on:** Feb 06, 2008, 03:00:25 PM »

Quote from: jimbo74 on Feb 06, 2008, 12:52:47 PM

where did you get these numbers? i honestly dont think you have 50 hp..... my lawnmower has 5hp.....

I made them up from my very own imagination, i'm sure that i'm way off. Either way, like I said the squirrel thing.

))--SLIVER-->

Doof · « **Reply #18 on:** Feb 06, 2008, 03:06:08 PM »

i didnt notice anything... been running the duels for a few weeks now. but nothing major...

Duffil · « **Reply #19 on:** Feb 06, 2008, 07:05:46 PM »

Quote from: skipnrocks on Feb 06, 2008, 02:59:55 PM

Sounds like not too much of a differance then, maybe depending on the tiredness of the motor. Thats cool especailly for those that are using it as more than a trail truck.

yes on both notes. I DD mine, but I can't remember which engine was in it when I did duals.

kiyul4130 · « **Reply #20 on:** Feb 06, 2008, 08:03:48 PM »

normally i could answer this question but either half the junk put in my truck is not mine, then it is, and inbetween all that the trucks broken so much i havent been able to tell yet. i would assume you wouldnt be able to tell because the crawl box is in high just like the back case. its basically neutral not doing anything.

Duffil · « **Reply #21 on:** Feb 06, 2008, 08:08:37 PM »

Quote from: kiyul4130 on Feb 06, 2008, 08:03:48 PM

normally i could answer this question but either half the junk put in my truck is not mine, then it is, and inbetween all that the trucks broken so much i havent been able to tell yet. i would assume you wouldnt be able to tell because the crawl box is in high just like the back case. its basically neutral not doing anything.

that was my reasoning as well...it should be no more than parasitic loss. But I swear you can feel a difference. Maybe it's all mental. the thing to do would be to have an unbiased driver (read: honda guy) drive it before and after.

BLACKDOG · « **Reply #22 on:** Feb 08, 2008, 12:56:26 PM »

Quote from: no-idea on Feb 05, 2008, 09:35:35 PM

his words are that it lost its "snap".

thats a good description

Not that the 3.0 has much "snap" to begin with, but I didn't notice much, just a little loss of the "snap" Still cruises fine.

Fearofrunner · « **Reply #23 on:** Feb 08, 2008, 01:42:03 PM »

X2 on no noticed power loss and silvers squirrls... they keep on running in there though

94MtnYote · « **Reply #24 on:** Feb 08, 2008, 03:41:33 PM »

How much weight do duals typically add to a truck?

DTB · « **Reply #25 on:** Feb 08, 2008, 03:47:18 PM »

Quote from: toyoduh! on Feb 08, 2008, 03:41:33 PM

How much weight do duals typically add to a truck?

I know a case weighs about 75 pounds

skipnrocks · « **Reply #26 on:** Feb 08, 2008, 04:35:04 PM »

isnt the doubler only part of a case or is that only with the 203/205 box?

Birfailed · « **Reply #27 on:** Feb 08, 2008, 07:48:00 PM »

goin duals might add 25 pounds, maybe. but just think when your pulled up next to a fullsize diesel, throw both cases in low and 4.10 gears you'll blow him away off the line. I did this with 5.29's and I redlined too quick to grab third and by then the dudes turbo was spooled up. But I got the holeshot for the first 30 feet!

DeadlyPeace · « **Reply #28 on:** Feb 08, 2008, 09:50:15 PM »

I've been running duals w/ a 22R for about 5 years now in my DD and I have never noticed a difference in power loss. Well other then very first time I tried to drive my truck after installing it. But I then I realized I had the dual case in low.

skipnrocks · « **Reply #29 on:** Feb 09, 2008, 07:24:03 AM »

Quote from: Birfailed on Feb 08, 2008, 07:48:00 PM

. but just think when your pulled up next to a fullsize diesel, throw both cases in low and 4.10 gears you'll blow him away off the line.

LOL till you hit your top speed of 7mph LOL

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