Looking at options for my next project, a turbo engine is a must to beat the
local boys in their WRX's etc. The Hot 4's 2001 yearbook has the NIS-016 510
that does 11.4 @ 120 mph with the SR20DET, and it looks pretty innocuous (ie
totally stock except for the wheels and stance) from the outside. It has 260
rwhp at 18psi, which indicates 335 engine hp assuming 22% drivetrain loss.
Diff is a billet axle 3.9:1 R200 LSD with 225/50-15 tyres.
The question is, given a similar size turbo would the L20B engine be able to
produce as much power as the SR20DET? Take it that the L20B would be
injected, with after-market computer, intercooled, mandrel exhaust and built
to the required standard. The fact that the modern engine would be cheaper
isn't the point. The idea is to keep the traditional L-series engine but
with a modern induction system.
Breathing (ie 2 valve vs. 4 valve) wouldn't be an issue would it, as the
turbo force-feeds the cylinders anyway. What about rev-ability and maximum
attainable revs, is the L20B too long a stroke and too slow to rev? Is the
non-crossflow head a disadvantage?
If the 300+hp L20 B turbo idea is feasible, then what needs to be done
w.r.t. engine internals? If anyone has already done this your thoughts would
be invaluable.
Thanks
Denzil Palmer
Queenstown
New Zealand
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