Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: MSD EFI vs Carb
All good comments, after learning more about the MSD set up, less I am liking it. I am leaning back on my carb at this point.
When I first installed Eddy Proflow , I thought it was a good deal. Issue I had with it and even contacted an engineer on it, was the inlet air temp sensor, which was mounted on the carb.
The engine required like most EFI, the chip to match the intake cam degrees.
All ran well until hot weather set in, then engine would surge at in any traffic when the inlet air sensor temp got over 140°. I was sitting in traffic on a 114° day, down town. My cooling system ran about 100° higher than ambient so water temp was about that, the hand held tuner recorded this as well as inlet air temp.
The electronics could not find a air or fuel window to compensate.
After discussing with the engineer, he agreed this was a problem, he recommended I move this sensor away from the engine but in path of fresh ambient air, which I did. The car was a 57 Chevy and above the head lamps , there was a fresh air duct that used to feed the interior floor. I put the sensor in that air passage and never had any other issues.
I see this MSD has almost the same sensor , but in the throttle body. With some tweaking , I could put the sensor in the cowl hood inlet and solve this.
So, I am still debating. I rebuilt my Z with cruise street so it appears I will keep the carb, at this point. I am getting good mileage at 23mpg running 2300 rpm . So I am asking myself, why mess with it. If I got 30 mpg, maybe but I don't see it unless I went to a v6 .
Thanks to every one that commented.
TC # 349
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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