5 Speed vs 6 speed - Miles Per Gallon
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- čas přidán 20. 10. 2019
- 1968 Chevelle SS396 (LS6 454), TKO600 5 speed
vs
1971 Chevelle SS454, T56 Magnum 6 Speed
Who will get the better HIGHWAY miles per gallon?
#T56magnum #TKO600
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Great video! Not many out there to compare fuel economy of car setups like this. I am building a Mark IV 454 with Holley Sniper EFI, T56 Magnum 6 speed, and 3.73 gears so when seeing that result on the 6 speed here it gets me excited at how well it could do. Thanks for making the video!
Cool video guys, when I swapped the T56 into my 68 with a bone stock 76 dually 454 engine it got 17mpg with 3.90 gears and 26” tires and a holly 750 double pumper. Since then I’ve built a 496 for it, built the rear end with eaton posi and 4.11 gears complete ride tech suspension frame off rotisserie restoration. When the car is back together I’m expecting to break into the 20mpg range. It will cruise at 2300rpm. The rpm is half the battle. The cam is the other half, you need to be up on the cam in order to take advantage of the drop in rpm. If the cam doesn’t start making power until 3000 rpm you’ll be lugging. With my previous setup I was lugging in 6th unless I was doing 75mph. I will let you folks know how I do because I found it to be a serious struggle gathering information when I did this 4 years ago. Nobody had done this, people would laugh when I would try to talk about a big block chevelle and fuel economy in the same sentence. I’m here to prove you can have your cake and eat it too, keep the simple carburetor, jet it properly, with the proper combination I know we can compete and even beat newer cars.
I hope you share your results
Update?
A race to see which Chevrolet is faster 5 speed Vs the 6 speed
his 5 speed has the .80 rather than the .64 option . that would have helped . also taller tiers would have lowered the rpm as well . Gratz on the 18.34 mpg tho thats awesome .
Thanks so much for the comparison, it's hard to find good mpg comparisons on aftermarket stuff like this!
you are welcome. I think MPG is an interesting figure for a street car.
Cool video! 2 thumbs up!
It would have been cool if you had swapped driver mid-way on the trip, so that the driving styles would have blended to 50/50.
Anyway, the result speaks for itself.
My 72 chevelle has 496 bbc Holley terminator efi 6 speed wide ratio magnum trans
Ice cold vintage air ac it’s so fun to drive daily after this swap I would never go back
joel herder u enjoy it more with 6 gears?
Had to give this video a like
Id say the 5 speed would pull much harder with the 4.11 gears and i bet if he put 3.73 gears in it he would get nearly the 18 mpg the black one got. Personally with my 454 5 speed i dont care about mpg. If you are worried about mpg you need a different hobby than big block chevies
In my 70 El Camino with an ls5 454 turbo 400 running 273 gears I was easily getting 13 miles to the gallon running 65 to 70 and I kept thinking with overdrive transmission and a EFI carburetor I should seriously get better gas mileage this video pretty much proves that point
I’m surprised a 454 Chevelle got 18 mpg. That’s way more than I thought it would.
Excellent video gentlemen!!! I learned a lot and look forward to seeing more of them! Im new into this world of Fitech so im learning from everyone but i really like your channel the most. Beautiful cars too guys. Greetings and salutations from Saskatoon.
Thank you!
U enjoy it much better with 6 gears?
@@jesco6830 Yeah. It shifts better, much more positive feel in the shifter itself. Before I would hate going on the highway, now I enjoy it.
SS454LS6 thank u for the response. Guess I’ll put aside 6k for the t56.. maybe in the long run ill save money buy using up less gas with the 6 speed. I’ll look at it that way as an excuse lol.
Glad to find this. I was able to achieve 19 mpg best in 1975 with my 1967 chevelle. 396 350 horse 4 spd Muncie 3:55 gears . Ran high 13s at Detroit dragway. No BS. Same engine in my 70 w31 would barely get 15 with a little less gear. Must admit I drove the chevelle at that time about 60. 55 mph speed limit. Not so slow in the w31 in 1977. I wonder if the fuel would factor in between then and now. I know how fortunate I am to have been able to be in my teens back then. Still have my chevelle and want to drive it on long cruises, thinking about a od trans.
I have a 1970 LS6 car, original owner. We just installed the T56, and thanks for your videos, they were a big help! Maybe we will see you out and about next summer!
That's awesome! Are you in Alberta?
@SS454LS6 Wetaskiwin, we will cruise Edmonton and occasionally frequent the dragway.
@@woggz21 Send me a message next time you bring the car through Edmonton. Instagram probably best bet.
@@SS454LS6 I definitely will. It's one of kind, you won't miss it. are you on FB?
@@woggz21 I don't have FB.
Seems like a fun drive between Chevelle friends under the guise of a science experiment. It really comes down to how much air/fuel you are running through the engine or RPM you are running while driving. You can get a TKO-600 with a .64 ratio 5th speed that is similar to the .63 ratio of your 6 speed. Tire diam and diff gears play a factor as well. If you had the same tires and diff gears you may not notice any difference in MPG if the 68 had the .64 5th. Given the two options I would prefer the 68 with the 4.11 diff. I prefer the 60's look and the acceleration with the 4.11 is more fun.
Lower rear gearing with one less transmission gear = less gas mileage. Turned out exactly the way most would expect it to.
you can get the TKO600 with a .64 5th gear, which would even things out a lot.
Unfortunately he chose the TKO with a .82 overdrive. If he had installed the .64 overdrive TKO the outcome would have been nearly identical to the 6 speed.
I definitely think with a 0.64 gear in the TKO it would be much closer. However I think most that own a TKO with a .64 say it's too much of an RPM drop between 4th gear and 5th gear. If most of your cruising is below 50 mph/80 kph, I would say the .82 gear is a better choice.
@@SS454LS6
I've done a couple dozen of those swaps and haven't had an owner yet complain of the rpm drop. The big blocks soak it up easily, and even less of a problem with the 4.10 gear he's running. I'm currently running a .64 version behind a little 302 with just 3.55's out back, and it works beautifully. I think people miss the boat choosing the .82 unless they have something like 3.08's out back.
With the .82 version and 4.10's, it only makes his effective ratio a 3.36, that's why his highway rpm isn't all that great and his mpg is suffering as a result. He could have run a 3.31 out back with an M-20 and accomplished the same thing. Just pointing out the discrepancy on the comparison. I like the cars so don't take it the wrong way, I have a 454 chevelle myself and I like what you guys are doing. As long as you're enjoying it that's what counts.
@@firebirdjone You are pointing out a fact, and I agree. Another way to look at is my T56 has a .80 5th gear, so having that extra OD gear has some cruising benefits over a 5 speed.
I'm surprised you haven't seen more issues with the .64 5th gear. A lot, if not most guys I know with some pepped up muscle car's (SB or BB), their engines don't like steady cruise much below 1800 rpm. A .64 gear on a 27-28" tall tire falls around 1400-1500 rpm at 50 mph. But at highway speeds the .64 gear is great!
@@SS454LS6
Most of it is tuning, especially if running a camshaft with some overlap. I use 5th cruising around town in the 302. It pulls down to 35 mph without complaints with the 3.55 out back and a 27" tire. 1800 is 65mph and it pulls the mountain grades around here without downshifting. Pretty nice actually. Speed limit here is 75mph which is about 2100 rpm. Really a sweet area rpm wise to be in for good fuel economy, which is the whole benefit of having it. I actually like 3.73's with this trans the best but the 3.55's work well enough it's not worth messing with.
I do like that T56 swap. I had a couple cars with T56's but it's been a few years. Mine were .50 6th gear. Really nice trans with a nice gear spread.
Actually I like the .082 overdrive and I made the best decision for my driving. I typically drive the car below highway speeds and use 5th gear all the time. The car doesn't see the faster highway speeds that we drove on the video too often. I restored the car in 1994 and back then it had a 4 speed and 4:56 gears. It used to rev so high on the highway that I threw out my tach because I was driving too slow trying to keep the RPM at 3500. After removing the tach I kept up with traffic by not knowing my RPM. I drove for 20 years like that. So to swap to a 5 speed and 4:11 gears for me is perfect. Side note: The car has a GM built LS-6 big block crate motor that I bought 29 years ago and I will not take it apart because it has ran 12 seconds in the quarter the past 25 years. I have replaced only valve springs 3 times over that period. I need the gear ratio to work with the dinosaur engine.
I didn't realize you guys were in Edmonton until the end. I just filled up at that gas station yesterday....
North enders on manning drive
Just proves that the overdrive transmissions whether stick or automatic work! You have to keep that highway rpm down around 2,000 rpm.
Hey guys. I bought the Fitech Power adder 4 master kit from my local speed shoppe for my79 Chevy Silverado with a 383 and 700r4. I got a Msd system for it too with the 6al box,blaster coil and distributor.
I really hope this will help with how it runs as im really new to all this fuel injection system stuff.
When i get it running id like to bring it up to show you guys if thats ok.
let us know when you get it running.
The .82 OD 5th in the 68 killed the mileage had it had a .64/.68 OD the test would have been way closer. 4.11 gear with a .82 OD works out to be a 3.329 rear gear which still isn't all that highway/mileage friendly
I thought long and hard about the overdrive ratio. I don't drive at highway speeds often. I use 5th gear always when I drive. If I had the .68 . I would likely lug the engine. My fuel mileage is better in urban areas where I normally drive. I have no regrets. Thanks for the comment
4.11 to 3.90 rear gear make a difference as well, but not as much as the double overdrive.
Great gas comparison. I'm probably getting around 10 miles per gallon. My combo is a mild 496 with 565hp/600tq, th400, 3,000 stall, and 10 bolt with 3.36 rear gears.
Overdrive definitely makes a big difference. Cruising around the city in the first 4 gears I get as crappy of mpg as anyone else haha.
@@SS454LS6 I agree! I'm in the process of installing a gear vendors overdrive which has a .78 overdrive gear. It will turn my 3.36's into 2.62 on the highway. I'll let you know once I test it.
@@musclebone7875 Please keep us updated
@@SS454LS6 will do bud😁👍
@@SS454LS6 update on the gear vendors overdrive. It's installed and I love it! 2,000 rpms is 60mph and 2,500 rpms is around 75mph. 👍
I might upgrade my 74 corvette transmission to a tremec 6 speed.
Should I use a cable clutch or a hydraulic clutch?
I'm currently changing my TH400 to a TKO500 5 speed. The hydraulic clutch is the way to go. Less headaches trying to get the fork angle and all that done. I should be done in about 2 weeks. Just waiting on a couple more parts.
It was an interesting comparison of the vehicle setup and fuel mileage. But not even close in looking at the differences between a 6spd and 5spd. If the 6spd car had only shifted to 5th (.80) then there might be some common ground. A reasonable test would to have both transmissions (5spd and 6spd)
with the same overdrive ratio, the same differential gear and of course the the same (identical) rear tires.
The extra gear is what it's about. Both cars staying in the 5th gear would then be about other factors, where as the primary factor in this result is down to the 6th speed's extra over drive gear.
Seriously guys... how can you drive these cars without having the urge to floor it? 😁
After our gas mileage test, we sure did!
I have a 65 Mustang 289 with a Tremec 5 speed .68 gear... the rear-end gear is 3.50 cruising at 70 is 2200 RPMs and I'm getting 27 miles to the gallon on the interstate
very impressive
I'd really like to know how tall of a tire you have. My 70 chevelle has a 508hp stroker and has the TKO600 with the .64 OD. 30.5 inch tire. Still has the 3.08 from when I had the muncie and I have yet to use 5th gear. WAY TOO HIGH GEARED. I'm debating on 3.73 or 4.11.
The rear tire diameter on the 1968 chevelle with the TKO60 is 26.5 inches.
T56 for the win 🏆
I’m looking to drop a tko into my 79 Camaro, gearing is surprisingly similar compared to the super t10…. except it has a 5th gear
Overdrive is gold
I was expecting kilometers per litre...
Great video! Early in your video you referenced what looks like a GPS hanging off the windshield bracket. What is it?
It is a Traqmate data logging device. I use it mainly for road racing, but it's pretty cool to see real time data and accurate GPS speed.
@@SS454LS6Very cool
I just did about 87 miles last night and used 6 gallons of gas, which works out to about 14.5mpg with my 6 speed. These are at speeds of 65 so I was right on the line of not being able to use 6th.
Honestly I cant complain... a 489 with a big cam getting 14.5 is pretty darn good. With EFI and the Overdrive I have double my gas mileage though!
The 69 had a 411 with a .080 overdrive, while the other car had a 3.91 with a .063 overdrive. That’s the reason for the better gas mileage. If the 69 fad .063 his gas mileage would have been better a lot better. The question is why such big gears ? This not an apples to apples test.
The whole point is to show what an extra OD can do. We even said it is not an exact apples to apples comparison.
5 spd with 3/70 gears
Ya what's the ET difference ?
about 4 tenths and about 2 mph. The 68 has a little more power, is lighter, and runs full slicks.
Good luck with the fitech I bot 1 it was garbage and customer service is non existance...thank God for summit givin me my money back Cool video tho 👍👍👍👍
If you check out some of my tuning videos you can see I got my Fitech running pretty good. But it certainly wasn't amazing out of the box. I agree their customer service is not great to say the least.
you need to LS swap those cars
never! Big block in my car for life, even if it isn't as efficient.