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cruise rpm/unhijacking thread
Glove box rpo sticker says i have 4.10's and there seems to be some disagreement on if i really do so here are some pics as promised. Suburban was a 2500 2wd and the truck got 19 mpg, the 1 ton has been doing 11-12 on my 30 mile each way interstate commute which is kind of frustrating. Engine came out of the suburban rolled one bay over and was bolted right back down in the 1 ton. Also included a pic of the 1 tons motor showing the brand new injection pump they installed trying to make it start with a spun rod bearing and 7 fried glow plugs. They also installed a new pmd/relocator, ops, glow plug relay and ignition switch harness. This was all done at a big diesel shop beware who is wrenching on your truck or you will end up selling it to someone like me for cheap and i'll build er :D
https://cimg1.ibsrv.net/gimg/www.die...e55b31e407.jpg https://cimg2.ibsrv.net/gimg/www.die...25a19ca401.jpg Cruise set on 75 mph boost gauge. https://cimg3.ibsrv.net/gimg/www.die...6c1898233e.jpg https://cimg4.ibsrv.net/gimg/www.die...c157feb844.jpg https://cimg5.ibsrv.net/gimg/www.die...eedd85e070.jpg This motor is going on a stand and getting refreshed for a spare, have a spare 4l80e now too :D https://cimg6.ibsrv.net/gimg/www.die...b1fa1b9827.jpg The suburbans motor has head studs, egt/trans/boost gauges, heath tune in a new pcm, relocated pmd, new ops, new oil cooler line fittings, hd water pump w/ dual t-stats, turbo master, 4 inch exhaust w/muffler, aftermarket high volume lift pump, no leaks, new thermostats and 250k miles and that all went into the new truck. Havent swapped over the g80 center section yet but thats definitely in the near future. https://cimg5.ibsrv.net/gimg/www.die...c930bfef2c.jpg His n Hers |
Nice set..
RPO-Ratio- R/P GT4 3.73 (41/11) GT5 4.10 (41/10) HC4 4.56 (41/9) HC7 5.13 (41/8) Look for a tag on the diff cover, should be @ 7oclock position IIRC.. |
its raining, i'll try to pull it in the shop later and slide under it. i need to service my diff's and repair my egt gauge anyways.
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Hate to say it but those are the same rpms mine ran with the wrong alt pulley. Went to a JY and pulled a alt and swaped pulley's, dropped 300rpm at 65 and almost 500 at 75.
Otherwise that's typical mpg for a truck with Heath tune and turbo master. |
same alt i had in the suburban, didnt even unbolt it. Oh yea he got super defensive when i told him how many mpg's i get, told me i must have a bad injection pump :nope:
can see the accessories still bolted to the engine in the pic up above lol Oh i went out and looked, the tag is gone off the diff too. |
19mpg empty, normal for me. Yep, the nay sayers question my math too.
My RPM is 2500 at 75mph.. Measure the alt pulley, I'll measure mine at first light and report back. |
Originally Posted by HeavyChevy95
(Post 1111307)
19mpg empty, normal for me. Yep, the nay sayers question my math too.
My RPM is 2500 at 75mph.. Measure the alt pulley, I'll measure mine at first light and report back. Mine gets 16mpg and weighs 10k. Not saying it's not possible just that most don't. My k1500 got 23mpg on a regular basis. |
about 2 3/8 by tape measure. idle speed 550. full throttle upshits right at 3500. Monday i'll plug my scanner in and compare displayed rpm to transmission iss and see how much variance there is. i also need to just mark the tires and driveshaft and run it around and do the math. To me it seems more like it has a 4.56 gear in it but the glove box says 4.10 so i suspect it has the wrong glove box in it. Damn 20 year old trucks. How are you guys getting 16-19mpg? im only doing 11-12. Been thinking i should probably check pump timing/adjust as necessary and see if that might be out of spec but it runs great so i doubt there is much to be gained back there. New air filter, 4 inch exhaust, new fuel filter, no fuel leaks, programmer, new tires, properly functioning turbo, trans works perfect, no brakes dragging, only extra weight beyond the fifth wheel hitch, proper operating temp, new fluid in t-case and diffs, and i use cruise all the way to work and do very little in town driving. Im burning through a full tank within 400 miles.
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Originally Posted by Josh Haynes
(Post 1111312)
about 2 3/8 by tape measure. idle speed 550. full throttle upshits right at 3500. Monday i'll plug my scanner in and compare displayed rpm to transmission iss and see how much variance there is. i also need to just mark the tires and driveshaft and run it around and do the math. To me it seems more like it has a 4.56 gear in it but the glove box says 4.10 so i suspect it has the wrong glove box in it. Damn 20 year old trucks. How are you guys getting 16-19mpg? im only doing 11-12. Been thinking i should probably check pump timing/adjust as necessary and see if that might be out of spec but it runs great so i doubt there is much to be gained back there. New air filter, 4 inch exhaust, new fuel filter, no fuel leaks, programmer, new tires, properly functioning turbo, trans works perfect, no brakes dragging, only extra weight beyond the fifth wheel hitch, proper operating temp, new fluid in t-case and diffs, and i use cruise all the way to work and do very little in town driving. Im burning through a full tank within 400 miles.
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ha, maybe i should slow down a bit :w2:
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slightly off topic, im going to be looking for some more power out of this thing soon. Truck pulling season is right around the corner and i intend to run this thing for a full season if i can manage it. Going for stock diesel ;) Never done it with this truck before but its going to need the rear end locked up and im pondering a air locker in the front. Daily driver, fifth wheel hauler, boat puller, sled puller... mmm diesel...
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1 Attachment(s)
Originally Posted by Tanman_2006
(Post 1111310)
That in a one ton dually 4x4?
Mine gets 16mpg and weighs 10k. Not saying it's not possible just that most don't. My k1500 got 23mpg on a regular basis. I think she's @ 7800 or 8800lbs empty, been years since she saw a scale or that Ive seen my feet for that matter. :jump: j/k Take a video with audio, post it on youtube... let us hear this screamliner..
Originally Posted by Josh Haynes
(Post 1111312)
about 2 3/8 by tape measure. idle speed 550. full throttle upshits right at 3500. Monday i'll plug my scanner in and compare displayed rpm to transmission iss and see how much variance there is. i also need to just mark the tires and driveshaft and run it around and do the math. To me it seems more like it has a 4.56 gear in it but the glove box says 4.10 so i suspect it has the wrong glove box in it. Damn 20 year old trucks. How are you guys getting 16-19mpg? im only doing 11-12. Been thinking i should probably check pump timing/adjust as necessary and see if that might be out of spec but it runs great so i doubt there is much to be gained back there. New air filter, 4 inch exhaust, new fuel filter, no fuel leaks, programmer, new tires, properly functioning turbo, trans works perfect, no brakes dragging, only extra weight beyond the fifth wheel hitch, proper operating temp, new fluid in t-case and diffs, and i use cruise all the way to work and do very little in town driving. Im burning through a full tank within 400 miles.
If my trans didnt shift till 3500RPMs, it would toss the driveshaft out the side or who knows what but somethings likely gonna break.... From a dead stop and punch it to the floor and hold on.. Once it manages to get traction and speeds off, around 3000rpms the trans shifts firmly.... All four tires duallies sound off with a loud chirp in 2nd and scratches at 3rd. Discovered that right after installing the DE 4" Exhaust.. Top to bottom of the on-ramp to the interstate is hardly 1/8th mile, Im already rolling at 80mph before I get to the merging area.. People usually get over, truck sounds like hells fury from behind when sticking your foot in that get up and go.. PCM monitors engine RPM via the CPS. The alt only supplies the I/P tachometer.. If you have a scan tool, you can compare the I/P with the PCM reading.. 550.1 miles per 27.0 gallons= aves 20mpg and some change... Thats running 75mph from pump to pump, haulin' ass up-n-down the interstate with just us and our luggage. Hauling or towing heavy depends alot on aerodynamics and terrain more so than overall wt.. My 24' enclosed cargo trailer aka the tool shack was like towing a 12-15,000lb brick, on flat ground doing 55-60mph, that rolling billboard still squeeked out 15ish mpg.. Climbing the mountains,12ish mpg.. Seriously.... I'd expect far more mpg from my diesel on a bad day than any of my bigblocks on a good day under the same driving conditions.. All Im sayin.. We've done this mpg thing a many times when we used to keep tract of mileage too... As for the truck sled pullin, IMO thats really bad idea if this is your daily driver.. Even going 4X4 offroad'n on wekends is risky. If I had a dollar ever time Ive had to pick up employees on monday who tore there pooh up out- drag racing, puddle jumpin', dune dasher, ditch diving, muckin' it up at the mudpit, WTFE often after a few to many brews and goated to act a fool, aka lets get stupid people... Dont be that guy.. Thats why I didnt buy 4WD, I knew Id have to find its outter-limits then use that as an excuse to 'beef' s'it up so that I can go out and try to break it again the next weekend then thrash about attempting to patch up the carnage, self inflicted most often. That was the point of us buying a new 'diesel' work truck. Free'd me up to repair other company trucks, or tinker with my hotrods and other toys, or jump in daddies truck and take a road trip to WTFE..... Who would have imagined the 6.5 work truck, admittedly a contractors cadillac would quickly became the entire families favorite road trip vehicle, most comfortable ride with the 800-1000lbs of tools stowed securely under the tanue cover. It was certainly alot 'sportier' than the wives minivan or the daughters Breeze.. Then it was routinely commandeered for grocery shopping to runs to the mall. Now I have to ask if I can use my own s'it.. 'magine that.... :rocking: |
our alts are the same size, i was going belt surface to belt surface not outside to outside. Its not my only truck, its just my favorite for commuting. I still have a 6.5 powered s10 i can drive :yeah:. For some context here im a master ase tech at a transmission shop with a near masters certification from gm. I have a parts truck and a spare 6.5 with a spare 4l80e. Last year i ran a season of figure 8 racing at two local tracks and came in third for the season. Before that i drag raced for a number of years and dailyed that car just to rub it in. I ask allot from my vehicles but they get allot in return. Its going to be sled pulling, thats not part of this debate :c:
Also these trucks are programmed to shift at 3800 under full throttle, not 3000 you should get that checked out. My point on shift speed and idle speed was that it is reading close and maybe even low at minimum and maximum, i have reason to suspect it is close in the middle too. But like i said i will be comparing tach reading to scan tool readings on monday for some more information. |
http:// https://youtu.be/ghCoGXG7jKU
My a team turbo and spool valve mounted on another truck for dyno purposes. Sounds like a big block with glass packs and a banshee howl out the exhaust. An a team equipped truck with a 22-2400 rpm tripple disk converter sounds like a stock car racing diesel. Ears will bleed! |
that link didnt work for me. We have been putting some of those triple disk convertors in dodge tranny's lately and with the pressure turned up the convertor can come on harder than a shift, pretty impressive stuff. Not sure i would want my truck to sound like anything that has glass packs. :w2:
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Originally Posted by Josh Haynes
(Post 1111349)
that link didnt work for me. We have been putting some of those triple disk convertors in dodge tranny's lately and with the pressure turned up the convertor can come on harder than a shift, pretty impressive stuff. Not sure i would want my truck to sound like anything that has glass packs. :w2:
It's deep but has a good rumble. |
scan tool verified my tach is right on all the way to redline. Went through and built my own "feed the beast" i had no idea how much high rpm power i was losing through that tiny hose. :jump: Im going to need to order up their fitting for the top of the ip but everything else was stuff i already had at work. Even with the stock inlet fitting it is still a huge difference, its still building boost at redline instead of losing it.
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Not doubting you but is your speed GPS checked?
You might have 4.56's but that is a little low for 4.56's and high for 4.10's but tire sizes could cause that to vary. Smallest to largest common dually tires: 225/75 r16 (bout 29") 215/85 r16 (same height as 245/75) 235/85 r16 (same height as 265/75) 255/85 r16 (same height as 285/75) |
cruise set on 75. gps read 74.4 this morning. 225/75r16 tires.
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https://cimg3.ibsrv.net/gimg/www.die...d12fc38d0c.jpg
https://cimg4.ibsrv.net/gimg/www.die...3202ab94a8.jpg cruise on, flat ground, taken within moments of eachother. |
Sure your TCC is locked up 100%, zero slippage?
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yup
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With your 29" tires that's actually pretty close to 4.56's.
Is it 4x4? Never seen a 4x4 with factory 4.56's, I had to swap them into my 93. |
Yea its 4wd.
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4.56's come up to 2700 rpm at 75 with those tires.
Mine runs at 2500 but I have 33's |
its showing like 2900 or something so its really close. tires could be a little shorter than spec of something. :tu:
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They are 29" unloaded, they might roll out to more like 28".
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