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I
change the RPM limit from 6,800 (which is stock for most US KL
cars) to 8,000 RPM. This unleashes a much wider power
band that you could not experience before with the stock
ECU. With the correct valve springs you can make a lot
of power above 7,000 RPM. You can swap out the ZE valve
springs and retainers for DE ones and these will do fine!
Also the air/fuel mixture is raised from 10.5:1 to 12.5:1
for a typical engine in good running shape with good O2
sensors. The VRIS points are set for the long neck KLZE
intake manifold but upon request I can leave them at KLDE
points or modify them for the KLG4 intake.
Keep in mind that when you purchase an item from
Xtremethings - nearly all of the profits go right back into
research and development of new products. So to help in
the efforts -when you purchase an item and become satisfied
with it -then please pass on the word. Your help in
spreading the word will be helping with the continued research
and development of new products that were currently
un-available. |
One of the most popular items I have is the
Xtremethings chipped ECU for
93-95 2.5L V6 Probe GT and Mazda cars. These ECU's
improve the performance significantly above 4,000 RPMs.
It will also eliminate an Engine Check Light (ECL)
cuased by faulty O2 errors or EGR codes. Also
this computer will work with your OEM (KL02) air sensor unlike a JDM
KLZE computer that requires a JE50 MAF sensor. If you
are currently running a stock computer you will be impressed
with the gains. 
The highlighted area
above shows how my solder
joints are better than OEM ones nearby. I
do this soldering work myself and I have 23 years of electronics
experience so you can be assured that it is done correctly.
All 93 and 94 ECUs are thoroughly tested after modification.
95 ECUs are not tested due to lack of 95 test car but are
warrantied to work and if it doesn't -send it back and I will
replace it and pay the shipping both ways. The
ECUs are now only $145 plus shipping due to the savings on
eBay fees. Please inquire about shipping costs before
sending money. Current
ECU stock: 1 - 93 ZE VRIS Chipped 4 -94 ZE VRIS Chipped |
 Click
the image for a super-sized photo.
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Need some high performance turbo fuel rails? How
about some 550cc injectors in rails that bolt directly up with
-AN fittings on every end? I have a large supply of
injectors suited for heavy boost applications to make some
very serious horsepower. I have matched sets that have
been sent off for professional cleaning, flow testing, coil
testing and matched in sets of 6 for our engines.
For a set similar to the set seen to the left with matched
injectors, custom modified and powdercoated fuel rails with
-AN fittings, rail bore run-out correction and powdercoated
hold-down caps I am asking $650. I will powdercoat them
in a color combination of your choice. This is the
ultimate in fuel for your turbo'd monster. |
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To the right here you can see what fuel rail bore run-out
is. The rail in the left of each photo is a severe case
compared to a less severe case on the right. No two
run-outs are the same so a rear rail can be severe while a
front one less so or visa-versa. This factory flaw can cause
a severe in-balance between the
front and rear cylinder banks during high fuel flow demand.
You do not want this if you want maximized power. Also
this can be bad on your engine because of incorrectly balanced
fuel/air ratios between banks.
The KL factory fuel rails are bored after casting with a
long drill bit. The drill bit wanders from center as it
nears the other end. To make it look centered on the
other end - they stop before the end and then drill from that
end to meet the two bores. This leaves a sometimes
severe overlapping section and restriction between the two misaligned
bores. I correct this problem with all of my fuel rails
so that both rails will flow equally under high fuel flow
demand conditions.
I also can set you up with a set of 850cc matched fuel
rails in your choice of color. Just let me know what you
want and I will make it so. I can either accept direct
PayPal payments or I can set up an ebay auction for you if you
prefer. |


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I do custom work such as seen in these
throttle bodies. I can cone the bore, hourglass the
butterfly shaft and even polish it if requested.
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A coned bore, hourglassed shaft throttle body is $135 plus
shipping. This is $5 cheaper than before because of the
savings in eBay listing fees.
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This is the latest XtremeThings
development. In cooperation with Nordskog Digital
Instruments we are developing a digital instrument panel for
the Probe GT. The speedometer can be fully calibrated to
your particular final drive ratio with your tire size to a
fair degree of accuracy. Once calibrated this display
can give you your 1/4 mile drag time, 1/8th mile
drag time and top speed in the quarter mile with the press of
a button. The cost for a fully plug-and-play digital
cluster will be in the range of $600. It will be
available in amber (shown), red and blue. Blue will be a
bit more because the high quality blue LED segments typically
cost more from the LED manufacturers
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