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  #31  
Old 02-16-2010, 05:51 PM
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What post?

Something to consider about increasing the MPG's.

I would say yes if you cruise around the max torque RPM, with modern speeds most of us are already well past the max torque while driving.

Moving the max torque down lower, not really going to help the MPG that much would be my guess.
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  #32  
Old 02-16-2010, 08:38 PM
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good point Dave.

my average speed range when working the truck (that's all the time,or i take the t-bird out) is 40-45.
40=1156 in OD
45=1300 in OD
(.71 OD gear/3.55's with 29.3" tall sneaks for a 3.84 actual ratio)

anyone with stock sneaks with 3.55's would be even lower of course at these speeds.

so say an IDI with 3.55 and stock sneaks of 31.7" tall,in order to hit your max torque at 1400 rpm with a stock cam,you would have to be going about 55 mph.
the E40D shifts into 4th going easy at 40ish mph.so between 40-55 with a stock cam,while running empty,your missing out on some power/economy.where this cam would have you right about where you would want to be using less fuel.

many actually go larger tires than 235's.for those with 3.55 gear sets,this really lowers the rpms even more of course.
lets say someone with the same setup goes with 285/75/16 (an 32.8" tall tire)
you need to be going a solid 55 before you hit the stock IDI max torque band at 1400 rpm.

while loaded,its easy to get there already of course and well passed.
tho if claims of 12% power both hp/trq are accurate,its going to be much easier to get ya going up there over stock too.

tho when heading back to pick up another load,your empty,and can stay comfortably in the max power band with the aftermarket cam.

anyone with a lift/35" and 3.55's of course (a horrible combo,but done nonetheless,because people don't understand how it changes the actual ratios.) would really see an increase i bet.they're cruising at 60 before they're where they should be.

i wounder if it just wouldn't help everyone out,in that,it would help you to more easily get up to speed using less fuel in the first place.
i bet it would bring up everyone's city MPG (regardless of any "typical" drive-line combo.)
more so,for those with turbo's.if the turbo spools up quicker/sooner,while taking off,that's more air in,and a better burn which would require less fuel to take off.it's the starting out,getting the beast going that's the big economy killer of course,as we all know,if you can go a solid 55 for hours,the economy sky rockets.
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  #33  
Old 02-16-2010, 09:30 PM
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ok.the fuel economy is already way above the gas jobs in the IDI power range.
most of us want to talk power.

keep an eye on my math please.
lets see what we have here.

so a stock N/A 7.3L is:

185 HP @ 3,000 RPM
360 lb-ft. @ 1,400 RPM

now,lets use the claims of 12% increase for the cam provided from type4.

12% of 185 = 22.2 HP increase. so this brings us up to 207.2 HP
12% of 360 = 43.2 lb-ft increase. so this brings our torque up to 403.2 lb-ft.
ok.so we also know the claim of about 200 rpm sooner.

so this would bring us to:

207.2 HP @ 2,800 RPM
403.2 lb-ft. @ 1,200 RPM

from stock:
185 HP @ 3,000 RPM
360 lb-ft. @ 1,400 RPM

pretty impressive mod.
now,add a turbo and an open exhaust to this foundation.

these are not numbers you can compare to a dyno tho.these are both at the flywheel comparisons.
so when someone does do a dyno pull,expect to see lower numbers of course,but hopefully the same or heck,even half these gains would be worth a couple hundred bucks imho.

to help put this cam in perspective;
this cam would approximately double the torque difference between the stock 6.9 and 7.3 IDI.


hows my math guys?


typefour,
i bet you find yourself staying in 4th gear more often with this cam?
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  #34  
Old 02-16-2010, 10:13 PM
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I can hover around 1500 RPM at about 60 MPH with my truck if its empty, but it doesn't have much left over for pulling or steeper hills (or both). If I don't have to haul anything, there is no rain or wind and I am in a patient mood, I've passed 20 MPG like that rather easily but empty runs are very rare.

I was able to take on a 5-6% grade at that speed and RPM with just barely enough torque to hold steady without EGTs not reaching 700 or any visible exhaust smoke so there was no lugging. Turbo boost was a mere 2 PSI.

Reasonable performance but put hook a trailer up to the truck or drive into a headwind and the fun ends. Then I have to reach down for the OD off switch and let it spool up. Also quite fun I should add

Now if I bump the speed up to 70 or even 80, the turbo can start spooling a little better and depending on the load and grade, I can leave it in high gear even with the trailer attached.

80 MPH.....did I just admit to that?

As to weather lower geared trucks can benefit from more low end torque. The plot of the dyno pull should give a good indicator to how useful it could be. I am not doubting Russ's claims that his truck pulls very well, but for those of us that aren't close enough to go for a spin with him, that would be the best alternative to make their own judgment for what sort of gain can be expected. From what I read, the torque range and turbo boost does start rolling in a little sooner, but it doesn't exactly kill the top end either compared to stock. Increasing the lift of the intake should have some rather nice improvements across the board I would think. But I'm still quite new to camshaft theory, so bear with my if i'm off the wall.
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  #35  
Old 02-16-2010, 10:18 PM
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i volunteer to do some testing.lol
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  #36  
Old 02-16-2010, 10:22 PM
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Quote:
Originally Posted by rupejosh View Post
i volunteer to do some testing.lol

Good, start with getting a rearwheel HP/Torque baseline. Then post your results and send your money and cam out. Finally we are getting somewhere. It's so nice of you Rupe to volunteer your time and money even in these trying times. I like these Moderators more and more everyday.
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  #37  
Old 02-16-2010, 10:40 PM
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i ahve actually been thinking about doing something like this in all reality i would like to find a motor that just needs rebuilt and take my time and rebuild it the way i want to but i only have my truck and one motor as of right now.i watch craigslist for free trucks and stuff all the time.
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  #38  
Old 02-16-2010, 11:01 PM
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Quote:
Originally Posted by rupejosh View Post
i ahve actually been thinking about doing something like this in all reality i would like to find a motor that just needs rebuilt and take my time and rebuild it the way i want to but i only have my truck and one motor as of right now.i watch craigslist for free trucks and stuff all the time.
I'm playin with ya but seriously if both the cam and pump were dynoed before and after on the same engine (using the same dyno) and it proved a respectable amount of torque increase I'm sure the guys that done the turbo and injectors would probably go for these too. I would more than likely, I'm already considering it.
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  #39  
Old 02-16-2010, 11:14 PM
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Hmmm just a few weeks ago i started looking for a different cam for the 92 7.3 and then look what pops up! MAN I LOVE THIS SITE ! Anyway the old truck in the avatar has/had the same issues,5:14 rear end 3000rpm max,and only 40 hp (now 65hp)top speed 45 mphV.S. modern highway speeds overcame all that.So now it's the 7.3's turn. 4:10's 3000+ rpm and 185hp.got me to thinking same problem just a little different motor, tranny and gearing.Haved learned alot from all of you and thanks.the 7.3 needs more hp/torque but for my app. with the 4:10's thats a little higher up on the rpm scale.so i need a cam that will do that plus other engine mods.next is the tranny talked to mikes in Ark.thats only 3300+ away. and with a few other tweeks pulling 14k shouldn't be to big of a deal.but you can't just build power and not beef up all the other things that go with it.just my 2 cents
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Old 02-17-2010, 12:27 AM
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[QUOTE=FORDF250HDXLT
typefour,
i bet you find yourself staying in 4th gear more often with this cam?[/QUOTE]

Well fifth actually, I haul this setup, and can get 12 mpg if I keep my foot out of it. about 15k total.
Fully empty with some tools and stuff in the bed and a fuel tank in it 130 gallon. We came back from Gerlach NV and got a solid 19 with the cruise set at 70. Oh the wife was driving that stretch . The problem is if I dont set the cruise I dont let anyone pass me because they see a big truck and just HAVE TO get around it
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218/461 on the dyno. after 80k miles, wanted to make sure she was broke in.
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  #41  
Old 02-17-2010, 02:03 AM
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good looking rig russ....what gears are you running and are you just running the zf5 od, or do you have a gv as well?
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Old 02-18-2010, 01:13 AM
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Just the trans and 355.s Oh, thanks
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218/461 on the dyno. after 80k miles, wanted to make sure she was broke in.
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  #43  
Old 02-18-2010, 11:32 AM
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Originally Posted by typefour View Post
Well fifth actually, I haul this setup, and can get 12 mpg if I keep my foot out of it. about 15k total.
Fully empty with some tools and stuff in the bed and a fuel tank in it 130 gallon. We came back from Gerlach NV and got a solid 19 with the cruise set at 70. Oh the wife was driving that stretch . The problem is if I dont set the cruise I dont let anyone pass me because they see a big truck and just HAVE TO get around it
I miss my Lance. Thanks for the reminder lol. Those supports look like the ones mine had. Always good to get the heart rate up mounting and dismounting when it's windy.
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  #44  
Old 05-17-2010, 03:43 AM
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I really like the sound of this cam. And its ground from a factory cam? Im wondering how much more it would cost to have a cam ground from scratch, and how much more capable it would be. Personally i would definately be interested in a "high end" horsepower cam, but this is a start.
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Old 06-09-2010, 12:47 AM
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this just in.a report from OB with the cam.

Quote:
Originally Posted by aaron1976 View Post
I finished installing a camshaft from Russ, Type4 and although I have a few bugs to work out I thought I would post a report on what I have noticed.

Torque and lower egt's. That is what I have noticed and even with lifters that don't like being on a new cam, I have more torque. My lifters are making a lot of noise and if I rev over 2500 rpms, I lose 2 cylinders as the lifters seem to collapse until I let the rpms drop down to 1500 or so.

The new lifters are ordered and I am not going to drive the truck again until I change them out and I can't wait. I drove down to Logan, Ut yesterday and there are plenty of climbs to test the cam out on. I have an ATS non wg turbo and the turbo comes in about 300 rpms sooner. Even if I drop out of the turbo boost the engine just keeps making torque. Before, if I let it drop below 2100 rpms (out of the turbo's operating range) the engine would fall on it's face and I would have to down shift. Not so now. the turbo makes 4 psi or so at 1700 rpms and that makes a lot of difference.

The egt's are about 150 lower too so that is always a good thing.

The horse power is down right now but that is due to the lifters and probably needing to be timed again. My injectors are at about 300k so I think they will make a big difference too and even with the lifters rattling along I can tell a very noticeable difference in the torque and torque band.

So that plan is to get the new lifters and pushrods in and replace my injectors. Then I will have it timed and see what it will do. I really think I will like it. It seems to love the 8 and 9 percent grades now. I can't wait to get it all buttoned up and do some towing.

I will post the progess and results as things progress.
the cam lobes are different,thus no longer matching the ware on his current lifters.new lifters should always be installed with a cam swap so they ware in together.
(this is why,for example if one needs to pull the lifters,you need to store them so they go back in each hole they came from.his old ones never had a chance to start with.)
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Old 06-09-2010, 12:47 AM
 
 
 
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