Through extensive
testing, trial and error we have tried with various pipe sizes
and combinations to find the best possible results for the
highest possible performance in all RPM ranges.
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The
Engine Dyno graph on the left shows the overall perforamnce
increase throughout all RPM ranges to give the overall improved
performance results. This was achived with extensive engine
bench testing time from our R&D.
This is the results based on the Z33 (350Z) exhaust manifold
(headers) + straight front pipes which brings out the overall
higher performance throughout the entire RPM range.
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Here
at Tomei we have 2 engine Dyno rooms dedicated for heavy
testing and research and development. Day in and day out
we just test and build daily with our passion. From running
the bench testing it is the best way to find the efficiency
of the engine through all power ranges whilst pushing the
engines durability to the limits.
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All data is
logged and tested for accruate testing and attention to
detail on the products efficiency for finding the best results.
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Case Example: Lancer Evolution
where the exhaust is situated at the front of the car, every bit
of weight reduction there helps a lot in improving the handling
of the cars cornering characteristics. Every bit helps for you to
gain that extra edge over your rivals.
Pictured:@EVO Outlet
(Dump Pipe)
Genuine@3.05kg
TOMEI POWERED EXPREME@1.75kg
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Another example of the product concept
designs that TOMEI has developed for the best performance and looks,
our Exhaust system for the Subaru Impreza WRX models GDB C/D/E/F.
Pipe Diameter.
A
Main Pipe
38.0mm φ
From
the exhaust port up to the gathering section (B), the pipes diameters
are 38Σthis has sucessfully raised the exhaust flux for a smoother
flow.
B
Gathering Pipe
42.7mm φ
By making it
wider helps with flow without impairing torque. This size was found
to be the ideal pipe diameter which gives the best improvement of
power.
C
Turbo Support Pipe
42.7mm φ
This helps the
exhaust flow from the turbine, by improving this section you can
then maximise the turbos potential efficiency.
D
Outlet
75.0mm φ
Optimised design
for increased performance and efficiency.
E
Following the Catalizer
75~70~65mm φ
To have the power
& torque be more better balanced a pipe with 3 stages of diameters
was adopted.
Angles in the
bend
f
Left Block
Side
Increased
efficiency and designed to be made as straight as possible.
g
Right Block Side
The
right section extractors have been specially designed for optimum
performance whilst preventing the thermo heat from effecting the
oil pan (sump) temperature.
h
Merging Section
The designates
the confluence point as possible limit acute angle, keeps flowing
together the exhaust of each bank smoothly.
i
Following the Outlet
Pipe
Attention to
detail and calculating the best ways to maximise exhaust flow efficiency,
we have taken all aspects into consideration such as clearance and
operating efficiency of each section.