20 VALVE ENGINE DIFFERENCES

[desmond auld]

Hi I posted on this list a long time ago for my first time and have been 
quietly reading the posts since learning a little as I go.  I have always 
wanted a fast URQ.  To me fast means 400-500 bhp.  On my first post I had 
cooked up the idea of fitting a 2.7 v6 biTurbo into the URQ giving enough 
room for a big intercooler etc.  But I was advised by the many wise people 
here, that if I only wanted 4-5 hundred bhp then the tried and tested I 5 
20VT was the way to go and it kept the car more original.

At that point i hadn’t even a URQ but I new of a cheep 2.7 T hence if that 
was the way to go I would of got the engine and kept it until the URQ did 
show up.  Well in the mean time I got a 84WR that needs a little body 
attention parked at my garage.  I fitted new (hydraulic shop) oil cooler 
lines as the old ones where duff and got the old girl running.  She had been 
sleeping for 4 years.  I haven’t drove the car more that a few hundred yards 
but already got a bit of a four wheel drift going on, on gravel.  These cars 
are class!

Anyhow a 20VT is what I want under the bonnet of my URQ.  I have been 
looking for the right one for a while now, and two have came at once!  I 
have the option of a more expensive late model s2 ABY or a earlier(cheaper) 
RR.  I have looked through etka and found that the crank, and rods are 
different.  The rods are weaker on the RR I believe.  And the ABY has the 
spark on plug system and the RR has a dissy.

Basically I need to know what is the ultimate tuning potential of both 
engines, before you need to get into changing rods and other expensive 
stuff.  I want the car for track days and fast road use.  I would be using a 
complete stand alone ECU package.  I have also just got a garret GT30R ball 
bearing turbo that is good for 510bhp.  Im not a great fan of the 70’s 
technologies that are KKK 26/27.  Obviously a custom exhaust manifold will 
be used.  I want reliable power.

How much more is a ABY/ADU engine worth as compared to a RR.  Eg twice as 
much, 50% more?

Please lead me in the right direction once again.  Thanks, Des.

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