1974 13b-re Nova
Thread Starter
Joined: Jan 2008
Posts: 438
Likes: 5
From: Ft Worth, Tx
Sonoco 116. Wow! 12-13 afr is much leaner than I'm used to going on turbo'd piston cars. Considering the extra 20 hp we saw from the bump from 10.0 to 10.5 afr, I'd bet there would be a considerable amount of power going that lean! Looked for a good thread concerning afrs on race gas but came up nil.
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Joined: Oct 2007
Posts: 799
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From: Plymouth, MN
Sonoco 116. Wow! 12-13 afr is much leaner than I'm used to going on turbo'd piston cars. Considering the extra 20 hp we saw from the bump from 10.0 to 10.5 afr, I'd bet there would be a considerable amount of power going that lean! Looked for a good thread concerning afrs on race gas but came up nil.
Nice build.
Chris
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Joined: Jan 2008
Posts: 438
Likes: 5
From: Ft Worth, Tx
Thread Starter
Joined: Jan 2008
Posts: 438
Likes: 5
From: Ft Worth, Tx
Yep. It's true......popped the motor. On the first cool day of fall, I took it out for a run and the boost hit 27 psi instead of the previous 22 psi. A number of things lead to it's demise, but two of the major contributors were too hot of a plug with too large of a gap coupled with a week ignition.
No worries though, I planned on toasting at least one motor in the learning process. Gives me time to finish the lingering things on the car in the meantime.
When the engine let go.........that ****** was straight out flying!
No worries though, I planned on toasting at least one motor in the learning process. Gives me time to finish the lingering things on the car in the meantime.
When the engine let go.........that ****** was straight out flying!
Thread Starter
Joined: Jan 2008
Posts: 438
Likes: 5
From: Ft Worth, Tx
Well, the revival begins. Sending the turbo to A-Spec for inspection and a swap from the 1.15 ar turbine housing to a 1.01. The new 4.30 back cut gears came in from Moser to replace the original 4.88 gears. These two things should help the boost come in a little bit quicker. Going to finish the windows, chassis wiring, and some other pending items before pulling the engine for a rebuild.
In the meantime, I finished the new driveshaft loop.
In the meantime, I finished the new driveshaft loop.
Thread Starter
Joined: Jan 2008
Posts: 438
Likes: 5
From: Ft Worth, Tx
A little more progress. I decided to add loops to the front and rear of the car to hook to for dyno runs, strapping the car on the trailer, and towing the car when the engine blows. 
When we took the car to the dyno, they screwed up the paint on the axle and scuffed the finish on the gas tank. Kind of pissed me off, so I came up with these. Pics of the front to come....
When we took the car to the dyno, they screwed up the paint on the axle and scuffed the finish on the gas tank. Kind of pissed me off, so I came up with these. Pics of the front to come....
