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Mounting ECU (and other sensitive parts) to the car; hard mount to chassis, or mount on rubber bushes?

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So I'm in the process of changing the KE-Jetronic out for an EFI setup on my Mercedes W124 300E right now, and I was wondering what the best way to mount my ECU is. And my fuel pressure regulator too, if we're really on this topic anyways.

So my train of thought was; if I mount it, I'd want it to suffer from the least vibrations possible, right? So, if I put it on those rubber little mounting bushes with threads coming out of either end (IDK if they have a specific name, but you probably know exactly what I mean), that should make any kind of shock less harsh on the ECU, but it would mean more bouncing around in general, since the mounts obviously have some flexibility. Or I could hard mount it to the chassis with a simple bracket adapted to cleanly fit the ECU onto the firewall, which would reduce any kind of bounce from rubberized mounting bushes, but it might increase the effect of chassis vibrations on the ECU. Now I'm probably overthinking this wayy too much, and I'm sure the ECU (MaxxECU Race in case you were wondering) was designed to more than hold up to a car's vibrations, but I'd like to hear your thoughts regardless. Better safe than sorry right?

I've been wondering about the exact same thing about mounting my FPR to the chassis, which is less sensitive than a ECU, but like I said, if I'm asking about this anyways, might as well throw this in here too.

Would love to hear your thougts,


Done it both ways, never had a problem doing either.

If its a solid mounted race car its probably advisable. The advice I've heard is to keep the FPR as close to the rail as possible for pressure dampening.

Way i look at it, the high frequency, high acc'n vibration may cause fatigue failure of the electronics and/or wiring and, if there's a socketed chip, or chips, it may promote it working out and/or fretting wear of contacts, which is a known problem.

If mounted on insulators, it should reduce these problems.

Oh, I think you're thinking of bobbins - examples of' https://www.gmtrubber.com/products/rubber-bobbins/

THanks for the input gentlemen, I guess I will put on some dampeners to be sure.

Also, now I know they're called bobbins, never knew that, thank you!

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