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Old 02-09-2013, 11:53 AM
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Turbo charging 69 nova 250 Straight six

Can you all give advice on the best combination of turbo and fuel feed for
69 Nova straight six 250?

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Old 02-09-2013, 12:06 PM
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there is a guy on you tube that was able to make over 250 hp with a turbo 6.The head is a poor design for power,but different is always good. good luck.
also look up clifford research
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Old 02-09-2013, 12:56 PM
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Way back in the April, 1968 edition of HOT ROD MAGAZINE, is an article where a 250 Chevy six was turbo-charged in a 1966 Oldsmobile F-85. With a four speed manual trans, and 3.91 rear end gears, it went 13.32 @ 103.21 MPH, and gets 17-20 MPG. Now, they made everything for this application; I can well imagine what it might do today with the improvements, and availability in turbo-charger technology. You might be able to find a copy of the magazine at your local library; I've kept mine all these years because it was so unique. Butch/junior stocker.
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Old 02-14-2013, 11:39 PM
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tom lowe is on u-tube making dyno pulls on a 250 turbo charged chevy and making 377hp and 388 torque. it might be a 292. I think he's at 12bolt.com
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Old 02-15-2013, 03:07 AM
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Inliners International devoted to all Inline powered vehicles

CHeck out the blown and injcted section on the inliners site. Also, find an Chevy Inline Power Manual. Tons ans tons of info on the site and in the power manual. Also, there are many guys at Inliners making tons of HP with turbo'd inlines.

Tom Lowe, mentioned in another of the posts, is one of the inline guru's. He will help you out with anything, either online or on the phone at 12bolt.com.

Good luck
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Old 02-15-2013, 05:10 AM
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Best to add fuel injection first then add the turbo. Check out megasquirt diy efi systems.

In theory, hp and torque will double with 15 psi of boost and 50% more with 7.5 psi.

I have a 168 cid (2.8L) inline 6 that trapped 110 mph in the 1/4 miles in a 3000 pound car using around 13 psi of boost. Around 260 hp at the wheels.
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Old 02-15-2013, 04:29 PM
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Back in the mid seventies I had a 75 F 250 hi boy that I had bought new with a 300 six. I put a turbo on it with help from a outfit called turbo city, I don't know if they are still in business or not. I remember not having a wastegate or a aftercooler. The truck ran very good and made really great power, We even hooked it to a pulling sled a couple of times just for fun. It really did good against some of the smaller V8's! It did have very bad boost lag. But with FI and a wastegate you could have almost no boost lag. I built it for pulling trailers and My first Wife used it to pull a big gooseneck horse trailer all over the nation going to endurance horse races. When We got divorced she kept the truck and I have no idea what happened to it. So with the advancements in turbo tech today I say go for it. I am currently working on a 2.3L ford with a turbo for my 27 C cab pick up. I would think long and hard about using forged pistons and keeping the compression down around 8.5 to 1. If you are going to run it on pump gas. And boost retard of some type. I won't even begin to try and tell you what cam to use as I really don't know what is even out there for a 250 chevy. But you might try Clifford research or Hamilton cams for a turbo grind, or something close to a turbo grind. If you do it please post pict's Thanks Bill
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Old 02-15-2013, 07:54 PM
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Could be some info here for you.
Inline 250 - T3 Turbo - w/ Video - The 1947 - Present Chevrolet & GMC Truck Message Board Network
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Old 02-16-2013, 06:53 AM
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For low boost (less than 8) then 8.5:1 is ok. But I recommend using 7.5:1 cr and using more boost (like 12 or 14 psi).

In 1969 the 250 was rated at 155hp at 4200 rpms, 235 ftlb torque at 1600, and had 8.5:1 cr. With 7 psi of boost then the engine should get 230hp and 345 ftlb of torque (in theory).

Hp/Tq multiplier = (boost + 14.7)/14.7

If you get a used super T3 turbo off a 81 to 83 280zx nissan turbo (also an inline 6) then it would make full boost by 2000 rpms with a 250 cid engine. If you want to raise the rpm for full boost, then get the turbine opened up a bit. Any turbo shop can do that. These turbo can be found at your local U-Pull-It type junk yards for less than $100 and come with a 7-8 psi waste gate and down pipe. These turbos are good for around 270 hp and work well on a inline 6.

If you make a draw through turbo setup then the turbo seals will be to be changed to carbon type seals.

Will need a boost retard ignition system or just lock the timing out at some value below detonation. Like 25 degrees. (the cheap way)

If you get an efi system, make sure to get one that has ignition timing control.

The cheap way would to use a junk yard turbo, get carbon seal installed, use your current carb as a draw through setup, do some diy plumbing, lock the mechanical advance and set the timing to 25 degrees.
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