Blue Print 383 economy udate! - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 18th, 17, 01:44 PM Thread Starter
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Blue Print 383 economy udate!

Just went over the 500 miles on 383 roller w/ Aluminum Heads break in and took a drive to test the gas mileage. I have a set of 3.08's, a TKO500 and she's topped with an Edelbrock 1406. At 80mph, 2K RPM, with the AC on, we averaged 21.75mpg. We includes my wife, 2 kids and myself. Around town with a normal shift between 2500 and 3K, I'm getting 16mpg.
- Rob

1968, Keisler RS500, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Radiator, BMR front suspension w/ Koni's, 4 wheel manual drum...
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post #2 of 8 (permalink) Old Mar 18th, 17, 02:13 PM
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Re: Blue Print 383 economy udate!

Very good...right there with some new cars

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post #3 of 8 (permalink) Old Mar 19th, 17, 05:11 AM
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Re: Blue Print 383 economy udate!

Congrats on the MPG.

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post #4 of 8 (permalink) Old Mar 19th, 17, 05:51 AM
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Re: Blue Print 383 economy udate!

Hard to believe you are getting that mileage with 3.08 gears but I think the first gear tko 3.27 does take away a little.

I had the 3.27 and went to 600 w/ 2.77, stock rear 3.73 and a Holley 3310. 23 mpg at hiway cruises at 2300 rpm. My set up is a little different from yours. I have AC also.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #5 of 8 (permalink) Old Mar 19th, 17, 07:16 AM Thread Starter
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Trust me, I'm not complaining. We're contemplating efi. That should be helpful!
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post #6 of 8 (permalink) Old Mar 19th, 17, 07:53 AM
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Re: Blue Print 383 economy udate!

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Originally Posted by rtchaney View Post
Trust me, I'm not complaining. We're contemplating efi. That should be helpful!
While the low first gear on the tko can be a problem as it was for me with a 3.73 gear, (dump truck feel), I feel that you can take advantage of getting your motor within its cams power band and feel its needs to cruise a little higher on the road to give you better gas mileage. In some terms, the faster you go, you will probably get better mileage as running that motor with that cam say at 22-2400 rpm on long cruises. That's where mine runs on PowerTours. Just a rear gear change could benefit you. Or shorter tires.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #7 of 8 (permalink) Old Mar 19th, 17, 02:40 PM Thread Starter
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Re: Blue Print 383 economy udate!

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While the low first gear on the tko can be a problem as it was for me with a 3.73 gear, (dump truck feel), I feel that you can take advantage of getting your motor within its cams power band and feel its needs to cruise a little higher on the road to give you better gas mileage. In some terms, the faster you go, you will probably get better mileage as running that motor with that cam say at 22-2400 rpm on long cruises. That's where mine runs on PowerTours. Just a rear gear change could benefit you. Or shorter tires.
I hit 45mph in first as I shift at 6K. The torque curve on this engine is quite flat. I'm not sure that she cares too much about anything over 1500rpm. Maybe someone else can chime in with 383 experience but it seems that tko likes a 3.08; while I'm certain that preference plays a large role.

Are you suggesting a 3.31 or 3.55 over my current 3.08?

- Rob

1968, Keisler RS500, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Radiator, BMR front suspension w/ Koni's, 4 wheel manual drum...
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post #8 of 8 (permalink) Old Mar 19th, 17, 05:14 PM
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Re: Blue Print 383 economy udate!

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Originally Posted by rtchaney View Post
I hit 45mph in first as I shift at 6K. The torque curve on this engine is quite flat. I'm not sure that she cares too much about anything over 1500rpm. Maybe someone else can chime in with 383 experience but it seems that tko likes a 3.08; while I'm certain that preference plays a large role.

Are you suggesting a 3.31 or 3.55 over my current 3.08?

- Rob
I mentioned that I did have the same TKO 500 with my stroker and 3.73 rear. I made a long trip in it, Billings, MT. to be exact. It was only the first gear, 3.27 that I didn't like. I could nail it and it would wrap up quick as you see first gear starting line ratio was 12.19:1. That's not much more than guys running a muncie 4 speed and 5.86:1 rear gear.
Your current starting line ratio is at 10.09:1 with your first gear and rear ratio. Then you shift to second and its almost half of your first gear start line ratio. Where as if you had a 3.73 rear with a muncie 2.20 first, you would be a 8.20:1.

Its all about getting your 3300# car moving and in the motors camshaft power band. While 3.31 & 3.50 are better , you can make things even better if you went 3.73. Its your the same effort to change rear ratios so make the best of it.

One thing certain in what ever you do, You will have to change the little plastic speedo gear in that tko to make final drive correct with mph if you change rear ratios, its easy. Its the same as many older Ford transmissions.
For a long time, before I found a driver that had a small 327, that wanted the 3.27 first gear TKO, I just used 2nd for take off , if I was driving line a senior citizen. Otherwise it was the first gear dump truck feel and the car would launch but only move maybe 30 feet.

This is my second TKO and I prefer the 2.77:1 first gear. Both sill gave the my final 23 mpg at 70 @ 2300 rpm.
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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