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RB30DET
You may recall
the R31 Skyline or the VL commodore both cars came out with a 3ltr,
single overhead cam engine named the RB30E, or in turbo form RB30ET.
Like later model Nissan engines it had great strength and tuning potential.
So, many serious enthusiasts
thought it would be a good idea to build a hybrid engine for the best
of both worlds, this would provide you with, extra displacement if you
had a latter model RB engine, or a twin cam head if you had the single
cam RB30 engine. Take a RB30 bottom end, add to it a twin cam head from
a later model skyline, put them together, and your left with a RB30DET.
If you own a RB engine and looking for 300+rwkw this engine should be
seriously considered.
Producing 350+rwkw with a
RB25DET (for example) is achievable but unless your engine is capable
of revving to 9000rpm your power band will be limited (dyno readings
will be peaky). This is because of the size of the turbo needed to produce
this power, larger turbos take longer to spool, boost may not come on
to 5000rpm, and in a street car this is not desirable.. Creating an
engine to reliably rev to 9000rpm is extremely expensive as your heads
and internals would need to be modified extensively.
This is what makes the RB30DET
a fantastic choice as you don’t need huge revs to make power. The extra
displacement of this engine means boost will start to build earlier
in the rev range and maximum boost will be produced much earlier. Modification
to the internals may be needed but not near as many compared to a smaller
displacement engine. This option is still by no means cheap, but it
is cost effective compared to other methods.
The following webpage contains
a PDF document which provides information on how to build one of these
torque monsters.
RB30DET
Guide
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