- Joined
- Feb 2, 2007
- Location
- Falls Church, VA
So first off, what is a Regina 740/940? A Regina 740/940 is a non-turbo B230F powered car that got the Siemens/Bendix engine management, produced for the American market from 1989-1994. Not all cars from those years have the Regina fuel system, depending on your locality. It is my personal belief that Volvo got a bin of cheap, out-dated EMS parts from Siemens/Bendix in bulk and decided they could cut production costs by throwing these systems on American market cars because we wouldn’t know the difference.
Regina cars differ from Bosch LH2.4 cars in a few ways. The Regina fuel system relies on a MAP (manifold absolute pressure) sensor to calculate engine load instead of a Mass Air Flow sensor, there is only 1 primary fuel pump in the tank, and the coil has a built-in ignition module. There are many other differences but the fact of the matter is that it is a non-turbo car with a non-turbo fuel system that cannot be modified for turbo use like a Bosch system can be.
The easiest way to identify a Regina car is to look at the ignition coil, if it looks like this, it’s a Regina…
Many threads have been started about turbocharging a Regina car but to my knowledge, nobody actually has done it. This made me curious, to the point that I had to try it.
I am not going to go too far into depth explaining how I ran the oil line and return for the turbo, there are a plethora of threads on this site explaining how to do that, do a search and you will find multiple ways to run a oil feed line to the turbo and a return line from the turbo. I removed the oil gallery plug at the front of the block and used that as my feed for the turbo.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302951.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302951.jpg" border="0" alt="Photobucket" ></a> <a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302952.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302952.jpg" border="0" alt="Photobucket" ></a>
The return is simply a stock return line, cut and extended with some silicon hose to a pipe fitting that I put in the oil pan. The pipe fitting is just something I had laying around, I put a nut on the back of it and two copper crush washers in between, it doesn’t leak.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302948.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302948.jpg" border="0" alt="Photobucket" ></a>
I chose to use a 1st gen Mitsubishi TD04H-13c turbo for its fast spool, adjustable wastegate actuator and built-in bypass valve. You can use whatever you want but a big turbo isn’t necessary for this. Obviously, you first need to remove the n/a manifold and downpipe. Bolt up a 90+ manifold and your turbo to the block, run your oil feed and return before going further. The transmission cooler lines will probably get in your way, don't worry, just carefully bend them out of the way of the turbo.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302942.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302942.jpg" border="0" alt="Photobucket" ></a>
Use a stock 740t downpipe to plumb your freshly mounted turbo into the stock n/a exhaust system. If you go to a local auto parts store you can find any hardware needed to do this if you can’t figure it out.
Using stock 740t coolant lines, the lower radiator hose and coolant reservoir feed hose I mean, hook up the coolant feed lines to the turbo. Since we aren't installing any sort of oil cooler it would be in your best interest to use a watercooled turbo as I have.
After mounting the turbo, remove the stock airbox and intake, pull the IAT sensor out of its housing and just let it hang in the fender hole to get adequate airflow.
Install a stock intercooler and piping. You need the upper and lower i/c mounts to do this. From the turbo to the throttle body you should have no problems. If your car has a clutch fan, you’ll need to trim about an inch off the round part of the shroud so it doesn’t come in contact with the engine. Also, you will have to cut an inch or so off of the upper radiator hose since you'll be pushing the radiator closer to the engine.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302946.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302946.jpg" border="0" alt="Photobucket" ></a>
Cut the IAC hose short so that you can put it on the hotside intercooler pipe where it would go on a turbo car. You will need to take the PCV hose that was disconnected from the stock intake and extend it with a coupler and some more hose over to the inlet side of the turbo. Use the elbow that was originally at the throttle body on the n/a setup as an elbow at the turbo inlet. Route the PCV hose over to the intake elbow and install it pre-turbo. Use the rubber intake hose from the Regina setup to extend the turbo intake from the inlet elbow you installed to up and over the battery. Install any sort of cone filter on the end of that. Don’t forget to run a vacuum line over to the CBV!
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302945.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302945.jpg" border="0" alt="Photobucket" ></a>
Now that all the hardware is installed, it’s time to start tricking Regina into working with a turbo. I was able to slacken the wastegate actuator arm down some so that it only boosts at 4-5psi, it’s up to you if you want to do that or stick with the stock boost. If you lower it you’ll be able to run 87 octane gas which is nice.
Get a 4.0 Bar fuel pressure regulator and install it in place of the Regina FPR. These can be found on turbo Dodge cars and the like. This will bring the injectors up to about 20lb/hr from 18. I used an adjustable FPR that I had laying around but I tried it with a 4-bar to make sure that would work too.
The key to really getting that seat of the pants oomph you want when you punch the gas is to hook up the cold start injector so that it runs at WOT. You need a standard Bosch 4-pole relay to do this, and believe me it’s really simple to hook up.
On the cold start injector there are two wires, one is blue/green the other is gray/black. Tap a lead into the gray/black wire and run it to the ’87’ pole of the relay. Ground the wire from the ‘30’ pole of the relay to somewhere on the body, I used the firewall ground for mine. Tap into the 4th fuel injector power wire which is green and run that lead to the ‘85’ pole of the relay. Lastly you need to tap into the TPS pin #3 wire which is red/white, and run that lead to the ’86’ pole of the relay.
If you did it right, with the ignition on and engine off, you should hear your relay click when you stomp the pedal to the kick-down position. Furthermore after doing that a few times you should be able to notice excess fuel being delivered because when you start the car it will take longer to fire and run a bit rough for a second.
This is exactly how I did it on a 1990 740GL with Regina fuel system and the car runs awesome, it’s so much faster than n/a and really feels like a stock turbo car. I hope you can get your car to run just as well.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302944.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302944.jpg" border="0" alt="Photobucket" ></a>
Videos added for motivation!
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/B0Gzamy37_g&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/B0Gzamy37_g&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/-HzqJOB5iRA&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/-HzqJOB5iRA&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
Regina cars differ from Bosch LH2.4 cars in a few ways. The Regina fuel system relies on a MAP (manifold absolute pressure) sensor to calculate engine load instead of a Mass Air Flow sensor, there is only 1 primary fuel pump in the tank, and the coil has a built-in ignition module. There are many other differences but the fact of the matter is that it is a non-turbo car with a non-turbo fuel system that cannot be modified for turbo use like a Bosch system can be.
The easiest way to identify a Regina car is to look at the ignition coil, if it looks like this, it’s a Regina…
Many threads have been started about turbocharging a Regina car but to my knowledge, nobody actually has done it. This made me curious, to the point that I had to try it.
I am not going to go too far into depth explaining how I ran the oil line and return for the turbo, there are a plethora of threads on this site explaining how to do that, do a search and you will find multiple ways to run a oil feed line to the turbo and a return line from the turbo. I removed the oil gallery plug at the front of the block and used that as my feed for the turbo.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302951.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302951.jpg" border="0" alt="Photobucket" ></a> <a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302952.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302952.jpg" border="0" alt="Photobucket" ></a>
The return is simply a stock return line, cut and extended with some silicon hose to a pipe fitting that I put in the oil pan. The pipe fitting is just something I had laying around, I put a nut on the back of it and two copper crush washers in between, it doesn’t leak.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302948.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302948.jpg" border="0" alt="Photobucket" ></a>
I chose to use a 1st gen Mitsubishi TD04H-13c turbo for its fast spool, adjustable wastegate actuator and built-in bypass valve. You can use whatever you want but a big turbo isn’t necessary for this. Obviously, you first need to remove the n/a manifold and downpipe. Bolt up a 90+ manifold and your turbo to the block, run your oil feed and return before going further. The transmission cooler lines will probably get in your way, don't worry, just carefully bend them out of the way of the turbo.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302942.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302942.jpg" border="0" alt="Photobucket" ></a>
Use a stock 740t downpipe to plumb your freshly mounted turbo into the stock n/a exhaust system. If you go to a local auto parts store you can find any hardware needed to do this if you can’t figure it out.
Using stock 740t coolant lines, the lower radiator hose and coolant reservoir feed hose I mean, hook up the coolant feed lines to the turbo. Since we aren't installing any sort of oil cooler it would be in your best interest to use a watercooled turbo as I have.
After mounting the turbo, remove the stock airbox and intake, pull the IAT sensor out of its housing and just let it hang in the fender hole to get adequate airflow.
Install a stock intercooler and piping. You need the upper and lower i/c mounts to do this. From the turbo to the throttle body you should have no problems. If your car has a clutch fan, you’ll need to trim about an inch off the round part of the shroud so it doesn’t come in contact with the engine. Also, you will have to cut an inch or so off of the upper radiator hose since you'll be pushing the radiator closer to the engine.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302946.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302946.jpg" border="0" alt="Photobucket" ></a>
Cut the IAC hose short so that you can put it on the hotside intercooler pipe where it would go on a turbo car. You will need to take the PCV hose that was disconnected from the stock intake and extend it with a coupler and some more hose over to the inlet side of the turbo. Use the elbow that was originally at the throttle body on the n/a setup as an elbow at the turbo inlet. Route the PCV hose over to the intake elbow and install it pre-turbo. Use the rubber intake hose from the Regina setup to extend the turbo intake from the inlet elbow you installed to up and over the battery. Install any sort of cone filter on the end of that. Don’t forget to run a vacuum line over to the CBV!
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302945.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302945.jpg" border="0" alt="Photobucket" ></a>
Now that all the hardware is installed, it’s time to start tricking Regina into working with a turbo. I was able to slacken the wastegate actuator arm down some so that it only boosts at 4-5psi, it’s up to you if you want to do that or stick with the stock boost. If you lower it you’ll be able to run 87 octane gas which is nice.
Get a 4.0 Bar fuel pressure regulator and install it in place of the Regina FPR. These can be found on turbo Dodge cars and the like. This will bring the injectors up to about 20lb/hr from 18. I used an adjustable FPR that I had laying around but I tried it with a 4-bar to make sure that would work too.
The key to really getting that seat of the pants oomph you want when you punch the gas is to hook up the cold start injector so that it runs at WOT. You need a standard Bosch 4-pole relay to do this, and believe me it’s really simple to hook up.
On the cold start injector there are two wires, one is blue/green the other is gray/black. Tap a lead into the gray/black wire and run it to the ’87’ pole of the relay. Ground the wire from the ‘30’ pole of the relay to somewhere on the body, I used the firewall ground for mine. Tap into the 4th fuel injector power wire which is green and run that lead to the ‘85’ pole of the relay. Lastly you need to tap into the TPS pin #3 wire which is red/white, and run that lead to the ’86’ pole of the relay.
If you did it right, with the ignition on and engine off, you should hear your relay click when you stomp the pedal to the kick-down position. Furthermore after doing that a few times you should be able to notice excess fuel being delivered because when you start the car it will take longer to fire and run a bit rough for a second.
This is exactly how I did it on a 1990 740GL with Regina fuel system and the car runs awesome, it’s so much faster than n/a and really feels like a stock turbo car. I hope you can get your car to run just as well.
<a href="http://s294.photobucket.com/albums/mm104/promise383/?action=view¤t=S6302944.jpg" target="_blank"><img src="http://i294.photobucket.com/albums/mm104/promise383/th_S6302944.jpg" border="0" alt="Photobucket" ></a>
Videos added for motivation!
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/B0Gzamy37_g&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/B0Gzamy37_g&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/-HzqJOB5iRA&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/-HzqJOB5iRA&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
Last edited: