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Old 05-06-2014, 03:10 PM   #1
no694terry
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Default JDM Yellow top side feed size

I bought a manifold off my buddy for $12 to snag the Yellow tops out of it for my forester build. He buys JDM ej20's to fix blown EJ205 WRX's. At first I thought they were EJ20K motors but they are actually, i think, JDM EJ205 motors for the 99-01 Foresters. (No AVCS).

There is a ton of conflicting info out there on these old Yellow tops, from 440cc to 550cc, wether they are sized based on 80% DC or 100% DC. Anyone know what they really are????



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Old 05-07-2014, 08:55 AM   #2
no694terry
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couple pics of them out of the rail. They are the phase two style. From a 99 JDM Forester. The intake manifold has the USDM EJ205 bolt pattern and no TGV's. Coils off to the side the fuel lines are set up for a front mounted charcoal canister. Throttle canle comes in on the RH side of throttle body.


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Old 05-10-2014, 03:26 PM   #3
subaru_gc8
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you can call deatschwerks and ask them or just send it to them and let them flow test them
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Old 06-02-2014, 02:40 PM   #4
no694terry
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DW said they are probably between 440 and 565 LOL. He wasnt too sure since they dont see a lot JDM/Europe stuff. I may just send them to get cleaned and have them flow tested. I need to know so I can input the size into the emanage so initial startup would be a lot easier.
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Old 06-03-2014, 12:30 AM   #5
Andrewxxcarlson
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Quote:
Originally Posted by no694terry View Post
DW said they are probably between 440 and 565 LOL. He wasnt too sure since they dont see a lot JDM/Europe stuff. I may just send them to get cleaned and have them flow tested. I need to know so I can input the size into the emanage so initial startup would be a lot easier.
They don't deal with imports much, ummmm...one of the biggest names in injectors for us.

Stop guessing. Send the injectors with unknown condition to be cleaned and flow tested. Easier most precise way to know fer sure. Orrrr have fun playin with the pw and latency..
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Old 06-04-2014, 07:52 PM   #6
no694terry
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ok. tomorrow i'm going to send them to DW, while i'm at it i'm going to send a set of red tops i modded to see what they are and if the could be used if i out grow the yellows.

here's a video i made showing how easy it is to remove flow restrictor from a side feed.

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Old 06-06-2014, 09:01 PM   #7
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Curiosity was killing me so i put together a simple injector tester with an old fuel rail, pump and stuff. First i tried a stock 280cc red top and i measured it at 300cc but that was at 100% duty cycle. I did the same thing to a modded redtop and measured 530cc. This was by no means to take seriously, just something to do with old parts. I might fix up my little tester and go find a better graduated cylinder. If i get four that flow similar ill try them in my NA motor with some e85. I just dont know how the straight pressure shot of fuel will reactor compared to the nice cone spray of the stock injector.
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Old 07-03-2014, 10:40 AM   #8
no694terry
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Well according to DW my 99 JDM Yellow tops flowed 556 CC average with a 0.5% variance. A well matched set I'm told.
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Old 07-08-2014, 02:39 PM   #9
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