RB Racing Turbos...Big Twins:
Shovels to M8's (Click om Image or Text Below)
M8 Turbos
Twin Cam
Turbos
Evolution Turbos
Shovelhead
Turbos
Models: Shelby Sawyer. Harley FXWG
The first successful turbo for the Harley big
twin was our design which featured an IHI Turbo, a
draw-through SU CV Carb, equal length primary tubes joining
into a 2-1 turbo header; a 2 1/2" turbo exit pipe with a 3"
diameter turn-out muffler.
The RB Racing kit featured an RB Racing billet
Boost Master wastegate, a chromed inlet plenum, and a
glycerin filled boost gauge. These kits produced 125 to 150hp
@15psi of boost.
No heat on your leg with exhaust routed forward
Some 25 years later Shelby got in contact with us and we got her some prints of the photo shoot. She was at the audition for the shoot with a friend and did the shoot after another model sort of dared her to give it try. Pro photographers Mark Rice and Ron Tuso did the shoot. Small world. Shelby is doing fine these days, involved in religious art.
Some kits were produced with black
chrome headers
The black chrome pipes indicate this was one of
the first 33 units we produced. Draw through SU Carb. BDK
Needle 101.5 main jet, 2 1/2 turns out...can't seem to forget
that for some reason. Actually there are a lot of reasons we
can't forget that. These were the first successful
Harley-Davidson turbo kits. If you ran them up to 15 psi and
worked on the engines they would produce up to 150hp...Of
course you couldn't stop but that was another story.
We even built, in his shop, a turbo for Dick
Evalesky of Atlas-Precision Frames (closed /retired) for a big
money grudge race that he won. Testing against a CB750 his
Chopper would thunder by after the CB750 got it out of the
hole.
Mechanical Boost Gauge
3 Bar Boost Gauge with
Tattle-Tale indicator showing maximum boost actually
run. Glycerin filled to resist vibration. Easy to
reset, even with gloved hand. Not lighted.
Part Number 03-1013 $149.50. Center back mount w/12mm x 1.5 locknut and integral push-on hose nipple. On sequentially injected Harleys we mount this gauge directly off of the back of our RSR Dual Air Fuel Ratio Gauge. Viewing the tach, the air fuel ratio, and the boost all in one location. Only O2 feedback is fast enough for real-time monitoring.
Boost Control
(Optional with External Wastegate)
Black Knob controls the boost.
Clockwise increases the boost. Turn the boost all the way
off (full counter-clockwise) and it's about 6-7 PSI. For
very high boost levels like on our Pro Street Kits we
require you upgrade your fuel pump and regulator system.
Just remember, at 8 psi, you can outrun about anything. When
you're cruising at 75 mph and roll the throttle on it will
instantly produce boost pressure. Rider adjustable when you
are riding. 6-7 PSI (Wastegate Spring) to 25 PSI.
Dual RSR Air Fuel Ratio Gauge is to the right. We have no idea how anyone thinks they are going to get their programming right without actually riding and observing the Dual O2 Display. The O2 Display is a mandatory purchase with the kit. For instance, our Turbo with some higher end, higher lift cams, pulls 10" Hg. in a high speed (80 mph) cruise on level ground. Barely nudge the throttle and it goes to 5" Hg and anymore than that and it goes directly into boost. Hit a long steep grade at high speed and the turbo will hold at about 2 psi boost. These figures are way more air and manifold pressure than you are used to programming for and it's not a good idea to beat your bike to death on a dyno, especially with a turbo. Best to ride.
Single or Dual RSR Air Fuel Ratio
gauges. Single Gauge on Shovelheads is the norm.