converting carbs to tbi?? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-05-2008, 06:34 PM Thread Starter
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converting carbs to tbi??

Hello, folks. Anyone out there have any experience trying to convert a natuarally aspirated old MB to an aftermarket or junkyard tbi setup? I know it sounds crazy, but I have done some pretty neat tpi conversions back in the 80's when gm's tpi came out, and was wondering why I couldn't get rid of the INAT's and replace them wth a pair of small tbi's. If anyone has ever heard of this being done, I would like to hear from you. Al DeVo
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post #2 of 3 (permalink) Old 11-05-2008, 09:17 PM
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I'm thinking about the conversion of my 65 220S to megasquirt, I also looked at the Holley web site and they have TBI conversions but they are for V8's. the main problem is the small engine size and that there are two sets of carbs, making the CFM rather low, per the Holley calculation.

I have the intake and exhaust manifolds from a 250SE and all I have to do is weld on injector bungs, make a fuel rail etc and make the megasquirt module.

Maybe there is a way to convert the Zenith carbs to TBI and let Megasquirt run the whole set up.

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post #3 of 3 (permalink) Old 11-06-2008, 10:54 PM
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it can be done but you would need to use a single TBI rather than dual,I have done a few and used a 1991 Chevy 350 pickup wiring/computer/Car is still working fine after 7 years,dual set up would pose quite a bit of problems
but it possible could still be worked out,just off hand I would think you would need to remove one injector from each throttle body and would need to merge the two tps signals into one...I could do it for you but I'm in Washington State....

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