I was referred over here by one of your regulars. When I originally swapped my 88 Trofeo I chose a Series1 supercharged. It was then swapped to a Series 2. The Trofeo and your Reattas are build on very similar platforms, so most of this should apply to you.
The steel power steering hose must be modified. I did this by cutting the hose just below wear it screws into the power steering pump. Use a tube cutter to cut the tubing. Clean out the burrs and use a piece of 5/16” trany hose and hose clamps to reroute the hose to just under the passenger side of the engine compartment to were the hose originally ran. (this is for the power steering cooler)
I used the stock power steering line with just a little tweaking. No cuts or rubber required. I'd recommend avoiding this as it can lead to leaks in the future due to significant hydraulic pressures used by a power steering system. If you do go the rubber hose route, at least make sure you add a barb to the line to help retain the hose.
Heater hoses must be modified. This can be done by using four heater hose elbows (found in the Help parts section) or you may use a straight hose connector and Goodyear hose springs (they allow you to bend a hose how you like and not have to worry about collapsing the houses). I prefer the second option.
I used 95 Bonneville molded heater hoses.
Throttle linkage and down shift cable bracket from the Reatta must be used (the SC model had an electronic trany so there is no spot for the down shift cable).
The Reatta downshift cable attachment from the throttle body must be used (just one bolt)
A 92 (and maybe 93) throttle cable bracket has provisions for all 3 cables.
The Reatta injector wire harness may and should be used, but it must be extended a couple inches to reach up and over the supercharger.
The injector harness from the supercharged engine could also be used if it comes with the engine. I just repinned it to the Trofeo's plug.
The Reatta fuel pump must be swapped with one out of a 93’ S-10 Blazer with Vin W (mean Vortec engine) Partsamarica part # P74074
For this, I used a GM 25163468, which is the stock pump. No fuel supply issues with the Series 1 or Series 2. Both had overdriven superchargers.
Connecting the fuel rails to the existing fuel lines may be one of the most adventurous parts of this swap. The reason I say this is that I have seen a couple different rail assemblies. The rail assembly I used is from the Park Avenue Ultra. Using this rail I switched to a fuel filter out of a 95’ S-10 Blazer, and found a plastic fuel line out of a gm car that was roughly the length I needed. This mans I did not have to splice the supply line (less likely to fail). I did splice the return line to a from the metal Reatta return line to a plastic line from the Park Avenue Ultra (I figured there is not ass much pressure todeal with for the return path).
The lines can be done many ways. I built formed flexible plastic line like these engines had stock. I swapped to a fuel filter that matched the Trofeo's supply line, the outlet connected to standard quick-connect fittings. I can get the number for this filter if anyone needs it.
For the return line, near the fuel filter is a union. The line to the engine was removed and again a formed flexible plastic line was created.
Another method would be to retain the car's stock metal line until closer to the engine, then add a barb to each line and connect to a metal QD fitting with rubber fuel injection hose and clamps. This would not be as stock appearing as using the plastic line.
I suggest using the Series one engine because many of the components are directly compatible with our systems. If the series two engine will be used you will be looking to modify a lot of wiring, and a few other issues. You would get more power out of the series two, but this also means more likely to blow your trany. Also power is no good if you can not put it to the ground. The series one gave me just what I was looking for, a little kick when passing on the freeway.
The S1 engine is a far easier swap mechanically. It is also a more stock-appearing engine in these cars. The S2 doesn't look stock.
Many have attemtped this swap, some try using the supercharged car's ECM/PCM. I highly recommend using your existing ECM, due to the data stream interface. These cars use the GM-30 protocol, which is unique to cars of this era. You're opening a big can of worms trying to get this data stream copied into a newer PCM.
There are several key changes that need to be done to the operating code as well as substantial calibration changes. To accurately design a program for these cars, you will need to start with properly modified code then spend significant time on a load dynamometer to adjust the calibration.
Scott Pearson
88 Trofeo Supercharged
www.theautoshop.net/SuperchargedTrofeo.htm
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