LINDSEY RACING INTAKE 951, 944 2.5 & 2.7 8v
Putting up with the "far from perfect" stock intake manifold is a thing of the past. Lindsey
Racing has after 18 months of development and refinement
introduced a high performance intake manifold for the
Porsche 944 at an affordable price. This is it folks!
It fits under the stock hood. It fits under your typical
strut brace. It clears all water plumbing with a stock or aftermarket water jacketed turbo. It utilizes any existing hard
pipes you have. In other words, you can install it on a completely stock 944 Turbo and it works with all existing systems. Of course it was not designed for a stock
machine, but we felt it needed to fit one physically. What it was designed for is to bring out the beast in your engine. You may only think you have done everything
to bring out the power in your machine. Look again. You want more high end HP and a much larger power band? This is the answer!
(Click images to enlarge)
The stock intake manifold not only has inadequate flow when you port your cylinder head,
it also has a 10% imbalance between the cylinders. The stock 951 intake flows between 206
CFM @ 28" on the first runner to 186 CFM on the third. Cylinders 2 and 4 flow between these numbers.
The only way to insure all your cylinders are running at
the same air fuel ratios is to deliver
identical air and fuel to each one. Our Ported Heads with guaranteed equal flow numbers, our matched Fuel Injectors, and now, our intake manifold, are what it takes to be sure.
The stock cylinder head flows 180 CFM so the intake is not a huge issue since all the intake runners are capable
of that. However....
Let's assume you're running our 232 CFM Level II cylinder
head or our 252 CFM Level III head. You're feeding it
with between 186 and 206 CFM from a stock intake. See
the restriction? The prototype intake to this which resides on our 944 Turbo Project Car flowed 250 CFM on
every port with the stock throttle body and this production piece is even
better due to it's improvements as we moved into
production. Now you can feed your ported head without
starving it for air and supply the
identical charge to each cylinder. Even higher lift
cams with our heads or larger valved heads will need the additional air this new intake can supply.
With a stock intake, or even a extrude honed intake,
you cannot correct the imbalance. If you tune your
largest flowing cylinder (#1) to run perfect, the other
three are rich. If you tune your least
flowing cylinder (#3) to run perfect, the other three are running lean. Even if you're running complete stand alone engine management with exhaust temperature probes on each cylinder, and can adjust the injectors independently, you will have 3 cylinders receiving up to 10% less air than the others, causing the engine to be imbalanced. If you're using a single O2 sensor in the pipe, you're actually getting an average of the 4 cylinders and
the actual values can vary. Without this intake, you
are probably running too lean on at least the
number one cylinder.
In comparison, it would be like having weak rings on 3 cylinders, clogged injectors, or leaky valves even if the engine is fresh. Far from optimum. Even the
strongest cylinder is being held back trying to drag along the weaker ones.
The correction of the imbalance and additional flow can equate to a substantial Horse Power and Torque increase in a way not offered until now.
(Click images to enlarge)
This intake is made from scratch. The injector flange is Precision NC Machined
from T6061 Aluminum to accept your injectors and fuel
rail perfectly. The Plenum backing plate is also
machined from T6061 and tapped for fittings for all
your vacuum driven accessories. The threads for your stock banjo bolts have steel thread inserts. The bores for the runners are NC machined with
a Smooth Flowing Radius
in effect making a perfect velocity stack out of each
runner without any obstructions in the air flow stream
like poorly designed systems. The runners are aluminum
cast from a high production pattern producing identical
parts every time. The runners have a 20% taper from top
to bottom. From the mold, they are NC machined on the
ends to insure a perfect weld fixture fit and identical
finished sizing from one to the other. The plenum is Cast Aluminum and NC
machined for the throttle body and mating surface to the plenum backing. The opening accepts an O-Ring that perfectly seals the intake to the intermediate pipe. The
threads are again fitted with steel inserts for
durability. All intakes are Professionally Welded by our new "weld guy".
The intermediate pipe is made from Stainless Steel. The
tube between the flanges is one piece and mandrel bent.
Your throttle body attaches to this pipe and seals with
an O-Ring. We have moved the throttle body up enough
to eliminate those fitting problems commonly associated
with installing a K27 sized turbo under the
throttle body. Want to go to a even larger turbo? No
problem. Request a custom intermediate pipe for no
additional cost. One of the beauties of this intake
system is the allowance of the throttle body to remain
in the stock location. By doing this, it allows you to
use your current hard pipes and everything else in the
area without "any" major modifications. This keeps the
flow of air the way it should be. Our flow testing of
intercoolers showed that when flowing them backwards, they lost as much as 10% flow. Some other poorly designed systems require you to flow intercoolers
backwards and buy all new and un-necessary plumbing.
The intake is available in three finishes. Fabricated
finish which is the base price appearance. Fully
polished for the show and go crowd, and
Thermal Coated with Teflon Lining for the serious racer. Thermal coatings keep the cold and heat where it belongs, and the Teflon makes the air passageway
slipperier.
All manifolds are
Ported and Flowed by our "Flow Guy". You are
"guaranteed" a minimum of 255 CFM per port. The 4
ports will be identical in their balanced flow.
Nobody else goes to the trouble to flow "each and every" intake manifold like we do, so you don't know what you're
getting. Should you have a head/cam combination
capable of more than that and would like additional
CFM, we can arrange that at additional cost. The
parts are thick enough to enter them and increase in
side diameters and get more flow. 312 CFM has already
been obtained with the stock throttle body. Increasing the throttle body size does nothing for you and may in
fact hurt the performance. The one area where bigger
is not always better. Don't be fooled by larger throttle body hype. If we needed one, we would have
installed one.
We have separated the components on the intake. Your throttle body can be bolted directly to the intake
manifold
if you like, since the bolt pattern was duplicated.
This will require you to make the necessary
modifications to your throttle linkage and intercooler
pipe to reach the extra distance as we did on our
project car. Or you can purchase our INTERMEDIATE PIPE
which allows you to make quick work of your assembly
with everything you need.
Intake manifold kits come with fittings, plugs, hardware, and dip stick mounting brackets (since
it used to attach to your old intake).
If you're looking for the hands-down best designed and
manufactured intake at an affordable price, then we
got the piece for you. Order yours today! Allow extra lead times for optional thermal coatings and polishing.
We now have Solid Motor Mounts that are 5mm shorter than
the Kokeln mounts. This will lower the entire engine
5mm should you need additional clearance under your
strut brace. In addition, it will lower the center of gravity of your car along with making it easier to remove the bell housing when servicing the clutch.
Lindsey Racing Intake Manifold Installation Instructions
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