DeatschWerks Fuel Injectors Top Feed 850cc

Part #: DET 21S-01-0850-4
( 7 reviews )



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Brand: DeatschWerks
Injector Size: 850cc
Injector Type: Top Feed
O-Rings Included: Yes
Plug and Play: Yes
QTY: 4
Rails Included: No
Mfgr. Warranty: 3 Years
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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Subaru Impreza
WRX STI 2007WRX STI Limited 2007WRX STI Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX STI Special Edition Hatchback 2010WRX STI Limited Sedan 2011, 2012, 2013, 2014WRX STI Limited Hatchback 2011, 2012, 2013, 2014WRX STI Sedan 2011, 2012, 2013, 2014WRX 2002, 2003, 2004, 2005, 2006, 2007WRX TR 2006, 2007WRX Limited 2006, 2007WRX Sedan 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Premium Sedan 2010, 2011, 2012, 2013, 2014WRX Premium Hatchback 2010, 2011, 2012, 2013, 2014WRX Limited Sedan 2010, 2011, 2012, 2013, 2014WRX Limited Hatchback 2010, 2011, 2012, 2013, 20142.5 GT Sedan 2009, 20102.5 GT Hatchback 2009, 2010
Subaru Legacy
GT Limited 2007, 2008, 2009GT spec.B 2007, 2008, 2009
Subaru Forester
XT Limited 2006, 2007, 2008Sports 2.5 X 2008Sports 2.5 XT 2008
Subaru WRX STI
Base 2015

The Deatschwerks WRX / STi Fuel Injectors includes a set of 4 100% drop-in fitment injectors for Subaru WRX 2002-2011 and STi 2007-2011.

The new WRX injectors have been developed with the same commitment to quality, drop-in fitment, and easy tunability that have made the Deatschwerks Subaru injectors the #1 choice of top Subaru tuners around the US and world.

High impedance coils for compatibility with OEM injector driver, ethanol and methanol compatible, each set is flow matched to within 1-2%. A flow report is included with your specific flow results, drop-in fitment for easy installation. Price listed is for a matched/balanced set of 4 injectors.

Deatschwerks fuel injectors are built from using only OEM Cores. Some of these injectors are new and some of them are core swaps. Each injector that is processed and built by Deatschwerks goes through a 40 point data inspection before it can ship out the door.

DeatschWerks has a core buyback program available for certain fuel injectors. If this buyback program is available for your application, information will be included with your injectors.
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edwiin 12 months ago
Shipping was FASTT!!
Verified Purchase
great stuff
putter380 2 years ago
Huge pain to install but awesome performance increase with tune. great injectors
Verified Purchase
great stuff
putter380 2 years ago
Huge pain to install but awesome performance increase with tune. great injectors
Verified Purchase
Deatschwerks 850cc Injectors
guest55c52785caae52f5098b6bb7 3 years ago
Over a year now, and these injectors are still performing very well. Thanks to the techs hear at, whom helped me pick out the correct size for my upgrade build, things are just fine. Very knowledgable staff. Thank You!
Verified Purchase
E85 Awesomsauce
bridgerhenriksen 3 years ago
I installed these at the same time with my DW 65c pump. I have an 08' STi and have tuned on a dynojet dyno at 344whp and 418wtq on stock VF48 turbo. The highest I've seen my Injector duty cycles go is 86% for reference... Been about a month so far and they are doing great!


  • AnswerQ: Injector latency  davinelika 12 months ago

    Can i get ecuflash / romraider injector latency data table for this injector?

    • A: Latency values are included with the injectors and we do not have them separately.

      Zach G. 12 months ago

  • AnswerQ: Power Gains?   2014wrbsti 1 year ago

    I have a 2014 Sti with down pipe and a Cobb AP tuned to make 280hp at the wheels on pump gas...will I see any power gains or get the max out of my stock turbo?

    • A: You might see slight gains with a pro tune however, you won't utilize these injectors until you upgrade the turbo.

      Spencer H. 1 year ago

  • AnswerQ: Pump gas and e85  chk122025199 1 year ago

    So if these can handle more power on pump gas, does that just mean that more mods are needed to build that power on pump gas?

    • A: Yes, chk. The pump is a supporting mod, only. It cannot produce any additional power only supply enough fuel to support it.

      Chris@DeatschWerks 1 year ago

    • A: I said pump in my initial reply, but both pumps and injectors are supporting mods. They will not make more power on their own as they are only able to provide more fuel.

      Chris@DeatschWerks 1 year ago

  • AnswerQ: E 85  Alain.wrxsti05255 2 years ago

    I am running a Cobb stage to and I want to get a custom tune for E 85 are these good injectors or need to go higher

    • A: 850cc injectors will support approximately 320whp on E85 and larger injectors are recommended if your power goal is higher than that.

      Zach G. 2 years ago

    • A: Ok what is the highest they do on pump gas

      Alain.wrxsti05255 2 years ago

    • A: 850cc injectors will support up to approximately 430whp on pump gas.

      Zach G. 2 years ago

    • A: I'm sorry but I do not understand on pump gas they support 100 hp more I thought once you put E85 it would make you faster

      Alain.wrxsti05255 2 years ago

    • A: E85 is capable of making more power because the combustion temps will be lower and that is safer for the engine so you can make more power, but you will need to use more E85 to get the same results.

      Zach G. 2 years ago

  • AnswerQ: Would These Be Optimal Size  akalawur77 2 years ago

    I have a 2012 WRX and I am running the Cobb Stage 1+SF 93 map. Just with that map I seem to be maxing out my stock injectors; highest I've seen is 123.08% injector duty cycle @just before redline. Would these be a good size to run around 80-85% max IDC? With a custom tune of course.. and maybe a downpipe.

    • A: Yes you could go with those without having any issues or you could also use the stock STi injectors. Either option would be perfect for you.

      Spencer H. 2 years ago