Jag V12 ECU Mods

[steve ravet]

> A thread on another list describes the results of having a stock
> Jaguar V12 ECU modified by an outfit in the UK.  The net of it is
> that very significant performance improvements were realized.
> 
> The pros of this approach are that the outfit knows these ECUs
> inside and out.  They obviously have a winning formula.  The cons
> are that their service is somewhat pricy and maintainability is low
> (they are in the UK and I am in the US).
> 
> An obvious question regards the feasibility of an ECU transplant
> with something less expensive and more easily modified by local
> firms, or even the owner.  
> 
> These engines have 12 cylinders and displace 5.3 liters.  They have
> one injector for each intake port.  Could one not take a suitable
> ECU, say from an 8 cylinder GM product, and work out a replacement? 
> Use the GM sensors.  Somehow drive 12 injectors instead of 8. 
> Account for the net difference in displacement.  Now you have a
> starting point.  How feasible is it to fine tune from there?  Is
> this approach, overall, more risky or more expensive than the option
> of paying a specialist for a modified 'stock' ECU?
> 
> I would like to hear the lists collective thoughts on this idea.

One small bit of advice:  TPI engines aren't all sequential.  Some 
are batch fire.  The '89 corvette, for example, had two injector fire 
signals, one for each bank.  That could be extended to 6 injectors 
per bank.  You might have to worry about increased drive current, but 
you could use Sandy's driver board for that.  It's ready to go right 
now.

Another choice is to transplant an entire GM V8 in there...  I'm sure 
you've already seen www.jagsthatrun.com, but if not go give them a 
visit.

--steve