Who knows their iron duke TBI?
Posted: Fri Nov 04, 2016 4:13 am
Yeah, that's right TBI!
So I have one of these
1972 Mercedes 220 gas. 72 makes it pre-DOT do it's got the euro style bumpers, taillights, big bakelite steering wheel, etc.
Ton of fun to drive... when its warm. It has a bastard of a Stromberg sidedraft carb on it that is hard to keep in tune (I've rebuilt it and cleaned it all out), the side draft with with the mechanical fuel pump loses prime when the car sits more than a couple of days. The automatic choke of course doesn't work and you've got to let it warm up for a while before you try to get on the road otherwise you're sputtering at backfiring at 7 mph pissing off all of traffic behind you. So,
I found this guy who put TBI on one.
http://www.peachparts.com/shopforum/vin ... rsion.html
He initially uses megasquirt to run the TBI, then uses the megasquirt to run a DIS system.
I was thinking, could this just be done with the stock "ecu" from an 80s GM iron duke tbi car? How many inputs does TBI really need to run? Seems like a coolant sensor, low pressure electric fuel pump, oxygen sensor, and map sensor is all that runs TBI. Its constant injection so there isn't a crank or cam sensor is there?
I would retain the stock Mercedes distributor and coil (probably go Pertronix or something at some point for further simplicity)
I have a spare 220 engine on the shelf to mock up a manifold on, but it seems like this could be done with a few wires, and a $50 raid on a Cavalier at Pick and Pull. Fuel pump, odds and ends, etc. Seems like it could be not all that complicated to do and be cheaper than having the automatic choke professionally rebuilt or replaced.
Is the TBI ECU as simple as I think it is?
This is a 105HP car 2.2L 4cyl car. I am not trying to make more power, just faster starts, shorter warm-up times, and probably smoother idle.
In that other thread he's running the TBI on its side, I would think the way TBI works it wouldn't be thrilled with being run sidedraft. I have access to an aluminum welder, I thought about welding a cast aluminum elbow onto the Mercedes manifold to be able to position the TBI like GM would have. But if you guys think it would work fine sideways, that's even simpler.
So I have one of these
1972 Mercedes 220 gas. 72 makes it pre-DOT do it's got the euro style bumpers, taillights, big bakelite steering wheel, etc.
Ton of fun to drive... when its warm. It has a bastard of a Stromberg sidedraft carb on it that is hard to keep in tune (I've rebuilt it and cleaned it all out), the side draft with with the mechanical fuel pump loses prime when the car sits more than a couple of days. The automatic choke of course doesn't work and you've got to let it warm up for a while before you try to get on the road otherwise you're sputtering at backfiring at 7 mph pissing off all of traffic behind you. So,
I found this guy who put TBI on one.
http://www.peachparts.com/shopforum/vin ... rsion.html
He initially uses megasquirt to run the TBI, then uses the megasquirt to run a DIS system.
I was thinking, could this just be done with the stock "ecu" from an 80s GM iron duke tbi car? How many inputs does TBI really need to run? Seems like a coolant sensor, low pressure electric fuel pump, oxygen sensor, and map sensor is all that runs TBI. Its constant injection so there isn't a crank or cam sensor is there?
I would retain the stock Mercedes distributor and coil (probably go Pertronix or something at some point for further simplicity)
I have a spare 220 engine on the shelf to mock up a manifold on, but it seems like this could be done with a few wires, and a $50 raid on a Cavalier at Pick and Pull. Fuel pump, odds and ends, etc. Seems like it could be not all that complicated to do and be cheaper than having the automatic choke professionally rebuilt or replaced.
Is the TBI ECU as simple as I think it is?
This is a 105HP car 2.2L 4cyl car. I am not trying to make more power, just faster starts, shorter warm-up times, and probably smoother idle.
In that other thread he's running the TBI on its side, I would think the way TBI works it wouldn't be thrilled with being run sidedraft. I have access to an aluminum welder, I thought about welding a cast aluminum elbow onto the Mercedes manifold to be able to position the TBI like GM would have. But if you guys think it would work fine sideways, that's even simpler.