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Hello, can anyone explain me the difference between the Bosh engine management systems for the B230F motors?<p>What is the diference between the 85-88 - LH2.2, the 89-93 - LH2.4 and the 91-95 - LH3.1 systems?<p>I've heard that the LH2.4 is the Regina and there is other that is the Rexx/Regina, but that is all I know about them.<p>Any info would be appreciated, thanks!!
 

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Re: Rexx/Regina and Regina! (Lucky_Avalon)

Melissa?<p>Play around on this to find all the answers!<p><A HREF="http://forums.swedespeed.com/zerosearch" TARGET="_blank">http://forums.swedespeed.com/zerosearch</A><p>or click away to<p><A HREF="http://www.angelfire.com/tx/texaschaptervcoa/VolvoFavoritesDillApril2006.htm" TARGET="_blank">http://www.angelfire.com/tx/te...6.htm</A><p>and get lost in the www Volvo World.<p>George Dill<p>
 

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Re: Rexx/Regina and Regina! (gdill2)

The Rex-I ignition and Regina Multi-port fuel injection systems are a bit different than the more common EZ116K/LH2.x systems. On one hand, the Mass Airflow Sensor used in the LH 2.2/2.4 system is more flexible since it directly measures the incoming air, as opposed to the Regina system that computes airflow based on air temperature and manifold pressure. The Regina system is, however, less intrusive in terms of air flow -- the intake system is not partially obstructed by MAF screens and cooling fins.<p>Regina based cars operate at the same fuel injection pressure as their LH counterparts. That said, the flow rate of the injectors deliver less fuel at their maximum duty cycle (170 cc/min per injector as opposed to 185 cc/min for LH injection systems). <p>Tthe REX-I ignition system has adaptive knock sensing capability. With a degree of additional safety from potentially destructive engine knocka more aggressive ignition setting of 10 degrees btdc for the REX-I is specified, as opposed to a slightly more conservative 12 degrees for the EZ116K.<p>The Regina/Rex-I system is most easily identified by the following key characteristics:<p>a. an air pressure sensor, located on the inboard side of the driver's side sheet metal shock tower brace. This is a small rectangular plastic box that is connected to the intake manifold by a small hose;<p>b. the presence of a diagnostic socket on the outboard side of the same brace; and<p>c. an Intake Temperature Sensor (ITS) located along the intake system, just after the air filter box. This feature is easily the most simple to spot, as Bosch (LH 2.x / EZ 116K) 740s used a Mass Airflow (MAF) Sensor in place of the air intake temperature sensor. While both the ITS and the MAF look similar to the untrained eye, the former has a small square two-pin connector whereas the latter has a rectangular six pin connector.<br><BR><BR>
<i>Modified by RearWheelPaul at 6:52 PM 7-20-2006</i>
 
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