Lmackattack

Maybe. Not as many low bridges so beam trailers are cheaper?

Here is what I have to offer tonight.. Starting from the top.. Rays superliner ! LT MACK Tommy's ex Greco B81 My first job in trucking. Kanzler R model. Its a Ex paulmbo truck Convoy to a truck show,al,Tom,me and johns f model. Kanzler yard Alan smith superliner, v8 powered UPS Cain trucking r model Mark mead rs700l Rat Mack.. sand.bmp

Few things here.. Power divider when "in" sends power to both axels giving you 2 axels with power at all times. When it's "out" only your rear axel has power. There is a little more to it concerning how the diff is set up and how that power is put to the road. Mack had both an automatic power divider and manual air operated power divider...both have there good and bad points. Manual let's you lock it in full time untill you unlock it. Good for when you think you may need it, bad for when you didn't think you needed it and get stuck because you didn't lock in. Macks automatic power divider will kick in and out as it sees needed. The down side was you never knew when it was in our out you normaly got thru the mud but if you got stuck sometimes it would disengage and you can't do anything about it....it was a great system tho... There is also a diff lock so that you can lock the diff in that axel, 100% of power is sent to both sides of that axel when it's in. When the diff lock was used with a power divider you had a solid live axel and power to the forward axel as well giving you power to 3 corners. Some trucks used in off road have 2 diff locks and a power divider giving you equal power to all 4 corners. This is great untill one wheel gets to much traction and you snap an axel,diff,driveline,.etc... So for the most part a a power divider and a diff lock is all you need so that theirs always one wheel that can slip and avoid drive line damage... Hope you can follow that..

I know the smell.. It's half burnt fuel. does it do this when engine temp is warm? Or Just after start up?

I think I remember your truck al.. Did you run with a rs700l that was black,orange and yellow 6 wheeler? think there was also a white gmc 6 wheeler that all ran with each other...

That's the same info I had heard. I had these codes put in 3-4 years ago. And it ran fine with no restriction issues....Then i did the other mods last year and have noticed the issue... I'm at about 5.4mpg all day everyday. We run hard tho and at this job mpg was never a concern. Hell back when we were sponsored by texaco havoline the rule was we coukd only fill up at a texaco or shell truck station. So the game all 5 of us truckers played on the way to and from the racetrack was who could rack up the most expensive fuel bill. Lol..... Not saying we ran at 2100rpm all day but we would run hard and suck those tanks dry and see how much we could put in me.. .part of the texaco sponsorship was that texaco covered all fuel and oil expense. That went on for almost 10 years. Hell just last week i stopped at a local gas station in fl....I put $1200 in the truck and gen tanks at one filling.. The lady behind me was in awe....lol

If I recall 2100 was max under load and the dash said to never exceed 2300. Even with the maxidynes we ran them flat foot on the hi-ways 61.5 MPH all day,every day

so looking at this again with the correct trans info but not knowing your exact RPM of the tire(a quick google search did not find info)... I got 44.5MPH here is my math... 2100x60 =126000 Rear ratio 8.24 x 498 tireRPM x .69 final =2831 2831 / 126000 = 44.5MPH again....if you can find your exact tire Rev per mile I can get it closer. but you will only gain/louse 2-3mph depending on your exact tire.

you are correct, that will help speed things up for you. I also used .78 as the overdrive in my math wich was incorrect... here is copy from www.macktrucksrus TRQ-72 TRQ-720 TRQ-7210 TRQ-7220 5HS - 0.85 0.66 0.69 0.70 5D - 1.00 0.78 0.84 0.84 5LS - 1.18 0.91 1.00 1.01 5LL - 2.52 1.95 2.12 2.13 4HS - 1.38 0.85 0.83 0.84 4D - 1.62 1.00 1.00 1.00 4LS - 1.91 1.17 1.19 1.20 4LL - 4.08 2.50 2.53 2.53 3HS - 2.22 1.49 1.45 1.47 3D - 2.60 1.79 1.75 1.76 3LS - 3.07 2.06 2.10 2.10 3LL - 6.56 4.39 4.44 4.44 2HS - 3.68 2.65 2.59 2.61 2D - 4.32 3.12 3.12 3.13 2LS - 5.09 3.66 3.73 3.74 2LL - 10.88 7.82 7.91 7.92 1HS - 6.42 4.62 4.51 4.55 1D - 7.53 5.45 5.45 5.45 1LS - 8.88 6.39 6.51 6.52 1LL - 18.96 13.63 13.78 13.80

Engine RPM x 60 / (Axle Ratio x Tire Revolutions per Mile x Transmission Ratio) = Top Road Speed (MPH) 2100RPM x 60 = 12600 Rear ratio 8.24 x Tire RPM 498 x trans final drive.78 = 3200.7456 12600 / 3200 = 39.375MPH max 2100 RPM 8.24 rear ratio I took a standard 11r22.5 tire size with 498 Revs per mile (your tire RPM may vary?) think that trans is .78 overdrive? hope this helps

codes in all 6 holes are 6999 no real smoke just a little puff after a quick shift. little more hase in the mountian thin air.. Trent

About 35- 40mph

Minimal You will need the charge cooler,tip turbine set up. That will help the most with hp gain... Possible that timing and pump specs will need to be bumped up.

I'm trying to keep it all stock looking.....it is a company truck and they know im a diesel nut.... I could mount external cleaners but then would have to cut the hood. I was hoping I could just find a larger filter housing and put in a larger filter. Keep it all under hood. I have not ran without the filter but see that the intake tube is 6" I figure it has to be the filter restriction air. Only other thing it could be is a rubber 90 deg bend that routes air into the turbo inlet. It gets a little smaller thru the bend. My egt are fine. Never go above 1100 they hold right at 1000 after a mile into a hard pull. Egt will creep to 1050 if the revs drop past 1550 and if it lugs down to 1300 I might touch 1100 where I either back out of it or shift. I normaly stay in the pull at 1700 and down shift when rpms fall to 1500.

I just park in front of those signs and then go to sleep..

Have the same issue with my rear rear... I have 34k rears so think its more to do with stress in that area... Mine cracked right thru one of the bolt holes near the back drverside. Had to grind it flat to help it seal better...

Have you found a less restrictive filter? If any moisture is in the air and the weather is cool I'm in the red with restriction. Dry weather it's 3/4 to the red....before the mods it never went past 1/4 mark even with an old filter...

Problem is the turbo is pulling in more air than the filter can Handel. I need a bigger filter/housing or some way to let it breath better. I have not had it on a dyno. Stock it's a 550hp 5ek model. I would think it might be near 575hp with the simple mods. But the way it pulls hills now....I find I run down them slower and go up them faster lol....

The mechanical will pull better easy to maintain. Electronic better on fuel. I would take a mechanical all day long.

I bumped up the fuel pressure, added ram air inlet scoop, and had someone put in hot injector codes on my 3406E. Now my air restriction gauge measures to 3/4 restriction even with a new filter. The filter is under hood with the air inlet on the driver side cowl. Cowl has ram air scoop. What are some options to let this thing breath better. Any filter options. For reference I can pull mt eagle on I24 in TN at 55-58 mph with 72,000 lb gross weight. not bad! Lol...

Good to know.. I remember when paulmbo was a big trucking outfit. Seams they down sized big time with the scandle. They seamed like the biggest outfit here in the 80's now it's rare to see them out in full fleet on the road.

Oh and I think its safe to open this thread up to any and all pics of Chicagoland MACK's thanks for keeping this thread going Al. Glad Brian has joined the ranks as well! Trent

HOW DID I MISS THESE....? never have seen these before and I have been in many of their yards. Those are some of the largest Macks left here in Chicago.... if they are still around? those look awsome. might still be more common sight out east as but I have never seen any this big in and around Chicagoland

Yea...the dumbing down of America... Forgetting how to exit your truck that you drive each day....that's like saying I can't go to work because I might forget how to get home.

I count 4 or 5 steps to get in that cab...awesome!