So, As you can see on the post before, I am on the market for 745...the more I do the research, I get more confused. Tell me all the Brick experts out there, what really are the pro and cons of having a used brick with either of the fuel system?

Cheers,
T

Bosch is a really elegantly designed system in my opinion. It measures the weight of the intake air directly. And injects fuel in proportion.

I think that Regina is cheap garbage. Instead of directly measuring the weight of the intake air, the mass is calculated from references and a pressure sensor.

I know that they both work well, but my "preference" is for "elegance".

I'm with Lucid.

Not sure what you're smoking here. :-)

Regina is garbage?: My arse. Arguably better than Bosch LH 2.4, IMHO.

Perhaps the AMM is "elegant", but it's (-016 AMM) also half as durable in my experience. Regina gets the same results, and the MAP sensor doesn't break until about 300K miles from my experience. An additional benefit of using a MAP sensor is that the IAC can suck air from the airbox instead of the PCV oil-laden stuff that the Bosch system has to suck. That's elegance.

Otherwise, it's a wash between the two. Though if I had to choose, I'd probably go with Regina. The 740's I've had/have with Regina almost never break. Both of those, a 1990 and '91 had a pile of mileage: 250k and 300k miles respectively. The LH 2.4 245 with a mere 134k miles is MUCH more needy...

-Ryan

--

Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 295k, Regina, 23/21mm Turbo Sway Bars
Buckeye Volvo Club

My '91 744 Rex/Regina car with 174K still runs like a Swiss watch.

Andrew S.

I'm sure there must be an obvious answer to this question, but why does the Bosch system require two fuel pumps while the Regina system only requires the in tank pump?

If you put the main pump in the fuel tank, you no longer need to have a pre-pump to get fuel to the main pump. :-)

A Bosch car runs pretty well with a bad pre-pump... as long as the tank is at least half full. Though, the main pump will hate you.

-Ryan
--

Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 295k, Regina, 23/21mm Turbo Sway Bars
Buckeye Volvo Club

Yeah - I suspect the leading cause of main pump failure in the Bosch setup is a failed in tank pump.

Which begs the obvious question. Can one replace the in-tank pump in the Bosch setup with the one designed for the Regina, eliminate the main pump, and drive happily ever after?

If so, seems like some fuse/relay bypassing would have to be done to make it work.

Can one replace the in-tank pump in the Bosch setup with the one designed for the Regina, eliminate the main pump, and drive happily ever after?
If so, seems like some fuse/relay bypassing would have to be done to make it work.

It would be a Plug & Play as far as wiring goes. The Bosch Tank pump is fed by Fuel relay via fuse 11, and connectors C1 and C93, exactly like the Regina Main pump.

I'm not sure if the Gauge Sender assembly would have to be swapped or not. The Regina Main pump is the same diameter as the Bosch Tank pump, but about an inch longer.

However, there are those who say the Regina pump is not as long-lived as the Bosch Main. But it's about $40 cheaper. IMO, the lifespan thing is hearsay at this point. So...........????
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

"I think that Regina is cheap garbage."

I think you are perpetuating a myth based on tech snobbery and an aversion to the unknown.

The engine performance specs are the same for either FI/IGN combo, the ECU pin-outs are also virtually identical, and the Regina MAP sensor + inlet air temp sensing is at least as reliable as the Bosch AMM, if not more so.

The Rex Ignition may even have an edge over the Bosch EZ 117 K if the frequency of reported problems here is a valid indication.

That's my opinion based on nearly 5 trouble-free years and good mileage with a Rex-Regina 940, as well as many prior years with Bosch. It's a toss-up.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

I've had a bunch of both and have no preference for one over the other.
--
St. paul, MN. 740 Regina x 2 and '95 944. Several past 200-700.

Either. They're both pretty much bullet proof. Some parts are different, but about the same cost to replace... and for each "more expensive than the other" part, there's usually a vice-versa, so it all evens out.

If I were in the market for a 740, I'd stick with 1990 and newer... and I'd look for one in the nicest mechanical and cosmetic condition. Then the question boils down to turbo or non-turbo. Bosch is in turbo's, Regina is in virtually all non-turbo's except for California cars, 16-valves, and a few oddballs.

In other words, FI system consideration should be at a much lower priority than anything else. Thus, based on the above, I bet you won't have to even consider the question of Bosch vs. Regina.

-Ryan


--

Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 295k, Regina, 23/21mm Turbo Sway Bars
Buckeye Volvo Club

T,


I can't say much about the pros and cons as I've only owned and operated Bricks with Bosch FI. Generally the Bosch stuff has worked quite well for me in a half dozen or more Bricks. You can, however, learn more about both system by checking the 700/900 FAQ. http://brickboard.com/FAQ/700-900/EngineFuelinjection.htm