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Old 08-28-2010, 12:14 PM
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hotrod road trip.. carb swap??

Im about to drive a short 375 mile trip in my trans am again. Car has a 383 and an lt1 t56 (.5 6th gear) with a 3.42 posi rear end also from a 4th gen. Right now I have a Holley 750 double pumper with a proform mainbody on the car. Car runs AMAZING with this carb, but I can tell its running slightly rich during cruise. Ive checked my plugs a couple weeks ago, i remember checking cylinders 1 2 3 4 and they were a slight tan color after a decent drive. I checked plug 7 and it was a tad bit rich. I understand you cant make all cylinders run the perfect stocheometric ratio, but you can get close.

I was given an edelbrock 1406 carb (600 cfm electric choke) about a week ago. I took it apart and cleaned it and rebuilt it. It was sitting up for a while. I have yet to put it on my car, but I thought I might as well rebuild it and sell it. Then somthing just popped in my head.. would the smaller carb help with the fuel economy for this trip or would it make the car run too lean during cruise?

Right now the engine is running 30 total centrifugal advance with 20 vacuum advance with a max of 50 degrees during cruise. Should I slap the carb on, or just sell it to pay for gas??
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Old 08-28-2010, 01:37 PM
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I'd give it a try, if it doesn't help then sell it.
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Old 08-28-2010, 04:12 PM
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Thats what I was thinking, Just wanted some input. Thanks!
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Old 08-29-2010, 09:37 AM
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The 1406 is setup pretty lean from the factory. I have one on a 350 SBC and ended up going about 2 steps richer for both the primaries and secondaries.
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Old 08-29-2010, 03:32 PM
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If the Holley gets 10 mpg, even if the Edel picked up 3 mpg, on a 375 mile trip it likely won't even save enough to pay for the rebuild kit and cleaning fluid. It's not going to be some mpg miracle. I wouldn't think it would be worth the hassle of setting it up, fuel line differences, etc. And thats if the calibration is right(not likely)

Probably make two-three times off selling it what it will return in gas savings on one trip
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Old 08-29-2010, 03:36 PM
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But if you keep the edelbrock and sell the holley, you'd make even more than if you sold the edelbrock.
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Old 08-29-2010, 05:30 PM
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I slapped it on, but it wasnt as great as I suspected. I put my holley back on the smile came back on my face when i pressed the go pedal hehe. Honestly the car gets horrible mileage if I get into the secondaires, but i imagine the little 600 would also. Doing 70 in my car is only at around 1700 rpm on the interstate, im not positve on what Im getting, but its around 18-22 highway.
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Old 08-29-2010, 08:17 PM
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You should be thrilled that you are getting 18-22 highway, it will take some intense tuning and time to prove each step to make an improvement. It isn't like you have a stock 290hp LT engine w/injection in front of that trans. I think you will be hard pressed to do much better, most guys with performance engines would be extremely happy with your figures.
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Old 08-29-2010, 09:07 PM
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Quote:
Originally Posted by ericnova72
You should be thrilled that you are getting 18-22 highway, it will take some intense tuning and time to prove each step to make an improvement. It isn't like you have a stock 290hp LT engine w/injection in front of that trans. I think you will be hard pressed to do much better, most guys with performance engines would be extremely happy with your figures.

I supose you are right.. my fuel gauge is really wonky, but ill see what i get this next few days when i leave for the trip.
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Old 08-29-2010, 10:02 PM
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Try a leaner jet in your primaries. Just one step leaner may clean your plugs up.
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