40 plus MPG C5
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1/4 mile/AutoX
Joined: Jun 2014
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From: Buffalo Texas
40 plus MPG C5
I have often pondered what it you took a C5 installed a 4.8 or alum 5.3 engine (we are NOT building a Prius here) change rear gears to 3.15, used smaller tires, like 225 front and 245 rear, this car would be a manual. I think with the right tune and mentioned mods you could get 40 plus ??? I think it would be a fun project and with gas prices well !!! any other brainstorms out there ???
Le Mans Master
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From: Virginia
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I'm much more concerned with power and performance than I am about fuel economy. With the mods you propose, driving it would no longer feel like driving a Corvette. So with that said, you could just pull the engine and convert it to all electric. Then you won't use any gas at all. Plus, if you do it right, the car will be VERY fast.
No Hostility Be Happy
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
I don't remember fully but I feel like someone already did this on youtube or something. They took a C5 with hp tuners and created a very narrow range in the VE table for lean cruise.
Supposed to run somewhat normal outside of that range but capable of crazy fuel mileage if you keep it in just the right spot.
I would think this would only really work for highway driving.
Even if you took Pounder's ideas while it would help for side street driving IMO 40mpg is impossible once any kind of stop light driving is involved.
Supposed to run somewhat normal outside of that range but capable of crazy fuel mileage if you keep it in just the right spot.
I would think this would only really work for highway driving.
Even if you took Pounder's ideas while it would help for side street driving IMO 40mpg is impossible once any kind of stop light driving is involved.
Last edited by Mr. Black; Nov 1, 2021 at 03:35 PM.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
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From: Buffalo Texas
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
I'm much more concerned with power and performance than I am about fuel economy. With the mods you propose, driving it would no longer feel like driving a Corvette. So with that said, you could just pull the engine and convert it to all electric. Then you won't use any gas at all. Plus, if you do it right, the car will be VERY fast.
Drifting
Joined: Apr 2005
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From: Bellinum Wa
https://www.hydrogen-generators-usa....rogen_kit.html
This isn't just for mileage. You can get small increases in performance also
This isn't just for mileage. You can get small increases in performance also
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Drove down to Indy Friday. Instant mileage was running around 30.5 mpg. That was a dream when I was a kid with a Chevelle. We used to draft trucks to get into the 20s. Had a buddy (still a great friend) who had a 71 and I a 69 (nice). They had motors that were very close in mods. We would drive to college together following each other. Man, those were the days.
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With gas prices what they are now, 40 mpg sounds pretty good, but I for one would not want to give up the enjoyment I get from my stock engine. Getting between 25-30 mpg is good enough for me along with the performance capability.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
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From: Buffalo Texas
Drove down to Indy Friday. Instant mileage was running around 30.5 mpg. That was a dream when I was a kid with a Chevelle. We used to draft trucks to get into the 20s. Had a buddy (still a great friend) who had a 71 and I a 69 (nice). They had motors that were very close in mods. We would drive to college together following each other. Man, those were the days.
my big block 69 Camaro got like 6 mpg
Melting Slicks
Joined: Nov 2014
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From: Havre de Grace Maryland
Agree with Jack. Why own a Corvette if you are interested in getting MPG. If price of gas is an issue then maybe your should park it or sell your C5.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
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From: Buffalo Texas
I guess some of you just don't get it !! my thread started by "I often pondered" the point of it was, if gas gets way out of sight I still want to drive a Vette and NO electric piece of crap !!!!
Le Mans Master
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I don't think I would go the 4.8 or 5.3 route as you may not see significant mpg gains versus your 5.7. Rather, I would increase the compression ratio, long tubes, free flowing cats, etc. as far as engine mods. Make sure the car is running 100% in shape to eliminate preventable inefficiencies. I would also look for ways to reduce weight - wheels, tires, brakes, carbon body panels, etc. Most importantly, look to improve your driving habits to increase fuel mileage, like hypermiling.
Last edited by 64drvr; Nov 2, 2021 at 04:45 PM.
No Hostility Be Happy
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
A valid solution to your pondering is right in this thread. Buy HP tuners (while you still can) and play around with it.
Drifting
Joined: Mar 2018
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From: New Jersey
I have often pondered what it you took a C5 installed a 4.8 or alum 5.3 engine (we are NOT building a Prius here) change rear gears to 3.15, used smaller tires, like 225 front and 245 rear, this car would be a manual. I think with the right tune and mentioned mods you could get 40 plus ??? I think it would be a fun project and with gas prices well !!! any other brainstorms out there ???