Late model Subaru Injector Modifications
We can increase the flow on both the top feed and side feed Subaru injectors. The injectors are modified, cleaned, new parts installed, and flow test data is included.
Just indicate you would like your injectors modded on the customer information sheet.
Be aware that your injector flows may or may not match up closely after being modified, (no matter who does them), that is why we recommend considering purchasing a already matched set... Since they grouped by flow characteristics.
All the top feed injectors shown here are interchangable, if you have one color, a different colored one will work since the size and connectors are the same.
A lot of "Hacks" are modding these injectors out there with bench grinders and the flows can vary by up to 10%. Do you want to trust your engine to them? Save a few dollars doing that... And it may cost you an engine.
It is always best get a matched set of injectors. It makes the difference between a good running engine and a great one.
Replacing any injector with another injector with a different flow requires the ECU to be reprogrammed, please consult a professional mechanic and tuner.
Note: Our injectors have been known to outflow competitor injectors.
Flow differences between shops can vary some. Click the link below for the explanation of flow variations.
We are not buying any injectors outright at this time.
2-6-10
We do not ship outside the USA or it's territories.
For shipments inside Washington state, please contact us about sale tax rates before ordering.
Modified injector sets purchased from us have a warranty for 90 days from the purchase date regardless of when they are installed. Any issues have to be reported during this time, no exceptions.
We assume no responsability on how these injectors are used or damage resulting due their use.
Injector Modifications
Modding your side feed yellow top (0D20 only) $50 each
800 cc's/min nominal
We also sell 1% flow matched sets of these side-feeds for $390 per set of four, shipped.
Please call for availability.
These sets are ready to install, and come complete with test data.
You can send us back your stock injectors for $150 refund.
Modding your top feed light blue (3920) $25 each
820 cc's/min nominal
For you folks that down time is an issue, we do have a limited number of matched sets of these injectors for sale. They flow within 1% of each other.... Typically 2 to 4 times closer than the average set because they are tested and grouped together from a large number or injectors.
They are ready to install, and come complete with test data.
You can send us your stock injectors back for $100 refund.
$250 per set of four, shipped.
Please call for availability as we may have various flow ratings for you to choose from.
Modding your top feed pink (3910) $25 each
870 cc's/min nominal
.........NEW..........
We now have limited stock of 1% flow matched sets of these pink injectors on fresh cores for $310 per set of four, shipped.
These sets are ready to install, and come complete with test data.
You can send back your stock injectors for $100 refund.
We also have stock flowing pink injectors available.
This part is just for your information only.
Are having trouble tuning this type injector?
Many customers are sending these injectors for cleaning and testing, but we have found most of them are fine and work as intended. The problem is that they are are a 15+ year old Denso design that were intended to be used as the secondary injector for the 93 to 95 Mazda RX-7 turbo engine. It's the same old technology injector with a spacer and different o-rings.They were not designed for use in a multi-valve new OBD II system.
Here is one of the reasons why... Note the difference in spray patterns
The stock yellow topped side-feed injector has the V shaped pattern on the left and the Denso (RX-7) injector on the right has a very narrow stream that causes idle and light throttle issues.
Due to the high coil resistance and heavy pintle design, they are very slow and that is causing misfire codes
Also their shorter length and non-stock two lower o-ring setup may not seal in the rail correctly.
One interesting fact about this Denso injector that very few people know about... They will flow more the longer they are used. This is one of a handful of injectors that exhibit this behavior. We have observed up to a 10% increase in flow in older, high mileage ones. Probably best to leave them for use in the old RX-7's.
Just some factual and hopefully useful information.
They are a fine injector.... for a an old OBD-I rotary engine, just not for the OBD-II Subaru's
Best to use a matched set of modified yellow topped side feeds. They will drop in without changing the connectors and be easier to tune.
7am - 6pm M-F & most Saturdays 9 -4 (pacific time)
Local drop-offs by appointment only.
info@witchhunter.com
WitchHunter Performance
22833 Bothell Everett Hwy
#1221 Suite 110
Bothell, WA 98021
206-919-0794
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