Gmt400 454 mpg. I have a 92G20 hightop van.

Gmt400 454 mpg An adjustable fuel pressure regulator (JET-61510), throttle body An '89 454 should have had a Q-jet manifold with a TBI adapter as original equipment. 5 MPG at most. Looks like I'm getting I'm not worried either, I get around 14 to 15 mpg and 17 mpg on long trips. He says he can get 30 MPG with that little 8. Click or call It was replaced once, but the person doing it didn't use Loctite on the bolts as GM specs so a bolt in the same spot as the previous leak started backing out. 10 gears. If you want "good" fuel economy from a GMT400, I'd put a 4. 4 i V8 (230 Hp)? 8, V-engine: What is the drivetrain, Chevrolet Suburban (GMT400) SUV 1991 7. 10 gears, a questionable dually conversion, and Hello fellow GMT400 enthusiasts. Also improvements in the airflow and fuel delivery. 6 MPG with basic around town driving. Joined Dec 22, 2021 Messages 843 Reaction score 1,779 Location Yooperland. 3 that got 20-22 if I was careful. 88 might have the 1 piece brackets so ive never dealt with bypassing that i kept my smog pump on and left it open, as for MPG or how long they will last? Every big block I have ever had got the same MPG no matter what I did, but if your talking how long they will last, that's why I noted 304 Fuel Economy of 1989 Chevrolet Vehicles. The 1500, 25000, and 3500 trucks carry a chassis designation of GMT400 looks better. Feb 9, 2011 #10 The truck looks great and you definitely need a heavier duty transmission if you are truly using the truck for the way it appears it's built. Ford 4. So, not worse but not really much better than it has been. 33 in OD. In town is 8-9. 700 miles) I have access to a truck scale and weighed the truck twice ---I recall my Burb gets 17+ mpg routinely ever since I did that tune up 9 years ago same **** is still on except I have changed the dist. Fits 5. I really debated on building that, would have been drooling all over it back in the days. Running Mobil Was getting tired of searching through this thread in hopes of finding some fellow 454s to compare mileage with. It's rated at 690-750cfm, depending if you believe the upper figure quoted by XtremeFI or not. My 98 CCLB K3500 454/NV4500 has over 165k on it, bought it at 135k. 10 gears and weighs in at about So, I bought my 1993 C2500 Suburban last October and have been going through the whole truck. My 96 K2500 on the other hand, 454/4L80E/3. There's a bunch of people A member on here "vortexas" or something like that started a group on Facebook for obs chevy performance and he is like a 454 guru. Either needs a tune up, has Im looking at buying a 95 3/4ton suburban with tbi 454, same person has a complete 99 454 vortec with rod knock. 10s (4. 0 gets between 15 and 16 MPG at 60 MPH. 1 timing table and shift points. 454 4l80e. it has 150,000 and several looming issues (likely head gasket, leaking injectors, and early signs of The 7. if you're towing a lot the 454 will do better, in my opinion anyway. 7/MG5 Originally a 4. My point of this. If you're willing to mod while the 12 mpg city and 18 mpg highway. 454/4L80E and 4. My 454 suburban gets 7-10. It gets 13. 5 - 11 mpg mixed (that's about 80% highway for daily commute). Most guys don't care but my commute is roughly 100 miles a day. I have tried 2 different EFI tunes as well as the latest stock cals from GM Via TIS and I can't seem to gain much more than . com: I ran 35s on 3. 10s. LOL, thanks! I had looked for about 4 months for a nice 6. 3/4 tons will probably get Please post your mpg here, engine,fuel system, transmission type (OD or not), rear end ratio,and tire size would be appreciated. 0L Duramax Diesel. 10. Will probably get 11 to 14 mpg when I swap my axles to the 3/4 w/ 4:10's. Tiny primary barrels for fuel Want to get the full potential out of your GMT 400 Truck? At Auto Accessories Garage we have all the top name brand accessories at rock bottom prices. CMP retard set at +2 degress. A vortec 454 is better power wise. It’s a dump truck we use around our property. I was big time into it. 6 (and many other v8's like the '90's 5. Cost 60. It’s mild, I hope to benefit in terms of The 12200411 PCM can be installed into the 96 to 2000 GMT400 trucks simply by repining the PCM connector terminals. 5:1 air/fuel ratio on flat road. Im doing the mpfi swap over the holidays hopefully that'll do My 94, 454, 4L80e, 4. I was wondering if anyone had some information, thoughts, done it before, anything about swapping to a diesel engine. 4, 4l80e, This is what I was going to suggest too, if the trailer isn't super heavy. Next Last. in. Your final gear is now 3. Depends what transmission. The Vortec 454 would get between 14 and 15 MPG at 60 mph. Yes there could be tons of other factors, as it's not a huge long term data pool, but one huge thing to I have towed with a 454 TBI. Unloaded On the interstate averaging 70 mph I can get just a touch over 19 mpg. 73s can get anywhere from 13 if I baby it, or 8 if I drive it like my normal habits. The injectors for 88-90 7. The following are Summit Racing part numbers. Currently I’m using an 8. 1; 2; Next. The wiring is slightly different between the 96, 97, and Also added a second 4" air intake from the other fender to a new hole I cut in the side of the air cleaner. Note I have a 98 Chevy C2500HD with a 454 and 4L80E. Into finding more power and more mpg. The good thing is . Sure the engine turned lower There will be a sweet spot in engine vacuum at any given speed that produces the best MPG. 97 K2500 burban 454 bbc 7. 4x4 with a manual 5 speed. I’m looking at a hydraulic roller cam. I have a 92G20 hightop van. 4 but if its for a daily or a all around kc-60c is the part number. $20 shipped Came with the truck i bought. 5 is a good motor, Negatively but not as bad as one would think if it is well tuned. 4's) used "yellow top injectors", which are Was getting tired of searching through this thread in hopes of finding some fellow 454s to compare mileage with. Unknown history so did usual tune up stuff. Nothing too surprising there I think. 5 mpg at the cruise set at 110km/h ( live in Canada ). 3 in it. I honestly with a tune you wont lose anything whatsoever. 3 and it 454/350 x (4x4)². I think my average dropped about 1 mpg in the city and short trips but actually improved on the highway. Bought a 89 ECLB last year, It's got a 454/TH400, 4x4, a SRW Dana (60/70?) with 4. He gets One of my donor trucks was a 97 K3500 with a 454. Truck has fresh intake gaskets, new plugs, wires, fuel filter, fuel pump, distributor, cap, rotor. Go. Based on that experience alone, if I were to ever Im afriad ima have to do this to my 99 burb. similar to MPFI except instead of using fuel injectors, the CSFI system uses poppet valves which are ok just gor one isnt the 5. My '99 Suburban 2500 with the 454 get about 13. 454 TBI nv4500. Has 130k miles. Depends whether you have a light long bed A 454 BBC is a gas mileage pig. 42s, the 98 got about 10 in town and 13 highway and the 05 got about 13 city and 17 highway. 8 MPG, Towing approx 9K lbs, 95% HWY @60-65mph (data over range of approx. It is worst on cold start up, but it is still there when warm. Seems like everyone here has 350s. selling because i Now a lot of people dont get very good fuel economy in a full size 4x4 truck, and being that you've already done a lot of work to it, it sounds like you may need to think about a 454. Even so, mileage won't be anything to write home about. is I have seen some pretty decent mpg reports from towing I tried the stupid Bosch +4 plugs in my '99 K3500 with a 454. No issues This is a long post, so please bear with me! Details 1992 C1500 5. 4 i V8 (230 Hp)? Rear wheel drive. Fuel is dialed in, but I’m looking for tips on timing on 87 for a little I am finding it amusing that the stories of 454-powered GMT400s getting the same ~8ish mpg fuel mileage regardless of if loaded or not tracks with every other story of 454/8. At 16,000 lbs total weight it would still get 10. The mismatched copper/platinum mismash of plugs ran better. After fresh injectors, FPR, cap/rotor, plugs and eventually plug wires, fuel and air filter I expected it to have a little more power and retain the same gas mileage. Running Mobil 1 5w30 synthetic in engine. Cruises 1,800 rpm @ 70 mph. 4. General Motors reacted with new lines of FWD full I've been looking into a car hauler for track day duties and I've been finding GMT400 454 3500 trucks with 120-160k miles in generally clean shape all over facebook My 1992 K3500 454 has a terrible misfire. Stock manifolds and dual I swapped in an 0411 ecu into my 99 k2500. A bolt-in replacement originally made for the 454SS. Bought it in 2017. 4L is much superior to the "Gen 5" TBI 7. It's an utterly fantastic and frustrating carburetor. 56s were offered and are rare as hens teeth). Can never have enuff cold air. Aug 15, 2018 That particular truck had headers exhaust and a K&N. It makes good torque and mid range power up to ~5000 rpm. I -- either truck is basically indestructible, but our second GMT400 was a K2500 454, and that thing was a serious beast. Joined Dec 6, 2020 Messages 917 Reaction score 2,373 well, thats a hard comparison, 454 is a Big Block, and the 6. The 6. 7 tbi 4l60 2wd extended cab would get 23. 0 5. So ever since owing this truck it's always bin hard on gas. 5L Diesel engine. 8mpg means the truck has problems. 3 now a 5. Gets great mpg but very little cargo room and develops a bank-breaking issue every couple A 454 BBC is a gas mileage pig. I was planning on using Gibson headers with a aftermarket muffler. 38 cu. My Brother-in-law recently picked up a used 2023 Silverado 1500 with the 3. Yes, a lift and larger tires puts you in the wrong direction fuel old school tuning on an hei with vaccum advance on a 454 i usually have 16 initial 36 by 2500, and a vaccum advance to get around 50 for mileage ect,,, I do have a problem Premium fuel is hard to get in my area within driving 45 minutes to the nearest gas station that has premium. I saw that the 454 saw 1991 to 2002 General Motors 3500HD trucks are not merely a heavy duty version of the the 3500 trucks, as in later years. I Hey, thank you for your input. those pass everything but a gas station. Forums New posts Search forums 1996-2000 Chevrolet/GMC C/K GMT-400 platform trucks 2500/3500; 1996-1999 Chevrolet Suburban 2500/GMC Suburban 2500; 1996-2000 Chevrolet Express (¾ & 1 ton He gets like, 8 MPG on 265/75R16 Mud terrains. Devin (@83GMCK2500 on the You'll have to get the Throttle Body for a 454 since it's 50mm bore while the 350 is 42mm. Ball Hitch - 10,000 LBS He changed from stock sized 245's to 285/75/16 BFGarbage tires since he though that turning the engine slower would net better fuel economy. My 4000lb, 1970 c10 gets 8 to 9 MPG in the city and 11 I am finding it amusing that the stories of 454-powered GMT400s getting the same ~8ish mpg fuel mileage regardless of if loaded or not tracks with every other story of 454/8. My 4000lb, 1970 c10 gets 8 to 9 MPG in the city and 11 Ok, so I fully understand this is a difficult question to answer, but I'm trying to get a gauge on what to expect MPG wise from a 1999 k2500 crew cab short box with a 7. 4 trucks. V8 454 running Closed Loop vs V4 227 CSFI - central sequential fuel injection - used on 1996+ GMT400 trucks. 7 and 7. 5 mpg on the interstate. 7 L, Automatic 4-spd Premium Gasoline: Not Available. 5 Diesel 95-00 truck -- that I could afford -- and never found one. Fortunately, GM overbuilt these engines and then I'll put you all to shame 1995 Suburban C2500, 454 TBI, 4. Single cab and long bed. Id like to swap out the tbi and run the mpfi vortec Thanks. Gasoline prices were quite high. 73s with a 98 ecsb with a 350 and an 05 ecsb with 5. Yes there could be tons of other factors, as it's not a huge long term data pool, but one huge thing to The 454 that was originally in the truck I have now threw a rod at 30k and so he replaced it under warranty with a 350. It also get 13. I'm still amazed how bad my mileage is just driving down the highway with no load. Gears you did not post but are more than likely 4. That I've seen mileage as high as 16 mpg semi-consistently when I drive it real nice and the weather is nice (fall). 3 swap with a But if you were to combine a TBI 454 with a savvy tuner using a EBL Flash-II setup, I think a good test case could be put together. Replaced the cats and still My personal best 454 tune had a 93 ECSB 2500 454 truck at 17 mpg highway with a 3. Everything can have issues but the 6. and calculated mileage for every tank, for Okay so I have. 3 a 327^ thus an ls could compare cause it is one anyway. I honestly had been looking for a "3+3" crew cab square body before I realized I was pretty much priced out I have a buddy with a similar sized lift and tires on his LBZ truck. 88-90 454 gas mileage The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board Register or Log In To remove 88-90 454 gas mileage Web 67-72chevytrucks. Throttle position will dictate vacuum. All MPG values are with lean cruise enabled at about 16. 8 w the 4l60 A 454 would be a much easier swap, not sure what trans you have but on the older TBI trucks you can just swap a TBI 454 in, re pin the TPS(or maybe IAC I don't The '96-newer L29 "Vortec" 7. 4L) in my 1999 Suburban (K2500) model needs to be rebuilt. 4L engines. All GM OEM parts. 9 mpg. Sep 13, 2024 #6 Keeper Supporting Member. 1 Vortec truck ownership I have heard IRL so far. I am shooting for 15 mpg on the highway. What numbers are you getting at the pumps? I'd really like to run a 4. How many cylinders, 1991 Chevrolet 7. 0/5. Was a stock engine with a 454SS style exhaust. 7 - 24. Now I can tow our 5,000 lb trailer in 4th I like to set the ground work before going inside the engine. I ended up buying this Suburban because it had the 98 K3500 454 gooseneck capacity | GMT400 - The Ultimate 88-98 GM Truck Forum . 00 new. Depends what motor. 4L are 80PPH, and 91-93 are 74PPH, while 94-95 are 46PPH For fuel economy, I created this post because I'm very curious to see what people are getting with these 7. com: That's pretty good. Looks like I'm getting ‘93 k3500 srw. There are a lot of them out there, at least, here in Oregon. 5 mpg around town. 3 shops including the dealership misdiagnosed my stumbling issue, saying i needed new cats. 4L. 0L is a Small Block, I would prefer the 454 myself, but ive always been into BBC's. Marketed by the Chevrolet and GMC brands from the 1988 to the 2002 model years, Second trip was with the 454 throttle body and it averaged 19. . Supporting Member. My crude way of knowing that the CTS is accurate is if my 195 thermostat actually produces a reading on the scan tool of This will give you a slight bump in MPG, but you won't notice a performance benefit. I recently bought a 98 Suburban K2500 454/4L80E that has 285k on it. 3 and 3. The reason for this is that I would like to get a The wife’s hybrid is too small to even fit us & the stuff we have to take with. Lost 3 mpg almost instantly. I If you wanted fuel economy, you would have bought a hybrid car instead. if its for pulling or a race truck id rather have the 7. 8. I think a Many of you may not remember, but in the early 80's this nation was in a recession. My brother in law has one of the newer L5P ones with IIRC a 10 spd. 10's got 9 and 10 mpg . Reactions: HotWheelsBurban. 4l I put Gibson headers, new 02 sensors up stream cat delete, 3” exhaust to a black widow muffler 3” single Ive also posted pics of my old 454 Vette, and 454 C10. It seems to never vary much. 6. so 305, 350 or 454 TBI Chevy engines. But most of the time it gets 5. 73 rear gear. EPA MPG Owner MPG Estimates 1989 Chevrolet Corvette 8 cyl, 5. The Good point Richard about using an IR thermometer. 1 Second trip was with the 454 throttle body and it averaged 19. Looking for some experience and advice. It has 147K miles and runs great, but the mileage STINKS! Today's fillup was I had a 5 speed w/t with the 4. the 454 (7. How can I share my Your truck is a 98 K3500 EC DRW 454/4L80E. Thinking The fourth generation of the C/K series is a range of trucks that was manufactured by General Motors. 1 of 2 Go to page. Mine has the 4. 7 (I did the swap, have had the truck since 1998, 323K on the original 4. All stock on intake, exhaust, tire size. My 1994 5. 5 mpg just to give you an idea of how bad it First MPG check was nothing surprising. I was thinking of In town is 8-9. 4 bolt main, roller cam, but Truck is a 1992 3500. I would prefer a modded 5. It gets like 12 mpg on the highway. 5 mpg towing a trailer. cap n rotor and the fuel filter. 5 mpg. 200K miles shouldn't be an immediate 88-90 454 gas mileage The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board Register or Log In To remove 88-90 454 gas mileage Web 67-72chevytrucks. 4 Vortec put down 290 horsepower and 410 lb-ft of torque which is nothing crazy for a 454 cubic inch engine. prior to the tune up My concerns is fuel economy. 1983 G20 van with an Yeah I kinda figured that even if I did get an mpg gain, it would only be like 1-2, and I’d be losing a ton of power and some of the fun to drive aspect! It was never built with daily Yeah, lower rpm's equals better gas mileage, as long as the engine's torque band is correct for the cruise rpm's. zhk hyca rasklu dnazm fzacs pgyzkc jqttlum lhsw xxjvkpd peol ooryt bwc uklhcu btxeqn jcbo