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Old 05-13-2008, 09:24 PM   #51
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As always Ron, well thought and laid out.. and very informative, as all your FAQ's are.... the only piece of info I can't seem to find among them ( or through many searches) is the stock 07 injector CC's..I need a baseline to go from when upgrading...finally decided on a td06/ 20g, and am gathering my arsenal of supporting mods
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Old 06-05-2008, 06:32 AM   #52
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Do anyone have any idea about how capable the paralell fuelrail-mod (using original rails) is vs Perrin Fuelrails?

I have already done the paralell rail mod on my subaru-rails. But are going to get the car mapped again, having added dual walbro pumps and 1000cc injectors. I have a twin scroll GT35 and I am thinking about E85 fuel.

For a 500whp application, would it be a a good thing to upgrade the fuel-rails futher (like Perrin rails), or will the parallell mod be enough?
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Old 06-05-2008, 09:21 AM   #53
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Parallel does nothing. It was designed back in the day when people though there was fueling issue with specific Subaru cylinders. Now that we know it has to do with the exhaust design, there really is no need for the parallel mod except for those that like to modify for modify's sake. Real fuel rails are an upgrade as they have physically bigger hoses, so they will flow more. And by upgrade I mean that only for people who need them AKA the over 500 WHP crowd.
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Old 06-05-2008, 11:46 AM   #54
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Quote:
Originally Posted by BoostUnderPressure03 View Post
What about the walbro 255lph fuel pump? Is that to small of a fuel pump compared to the 341?
i would also like to know why the 255lph is the only walbro i seem to see on subaru performance sites? what is the difference in the 255 and the 341/342?
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Old 06-06-2008, 04:30 AM   #55
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Thanks Unabomber! That makes it a bit more clear.

The Satch: Both 341/342 are a walbro 255lph (GSS 342 is the name of the kit that is more plug and play for subarus, 255lhp just means it flows 255 liters (l) per hour at high pressure (hp)).
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Old 06-07-2008, 03:39 AM   #56
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Quote:
Originally Posted by markman View Post
^old thread bump for an answer to this question?

I'm curious, as I have an STi pump, and soon also will have a VF39 & STi TMIC along with some pinks to slap on my bugeye... logic would dictate that if the STi pump can fuel a 2.5L engine with a VF39 it should very well be able to fuel an ej205...

I could be wrong though and would like to know.

I agree can anyone confirm this though.
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Old 06-07-2008, 04:26 PM   #57
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^ I am guessing it will still work but I think most are suggesting not to go with the sti pump since the stock STi's fuel capacity is already being maxed with the stock tune. It is a wise idea to just spend the extra $50 and get the walbro pump.
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Old 06-14-2008, 09:35 PM   #58
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bump for an old question, are the 07 STI injectors the same as 06+ WRX injectors.

Judging from the Cobb maps 06 and 07 injectors can support comparable power levels(VF39 WRX and stage 2 STI, resp.) , thus, they must be flowing pretty close, but I have not seen anyone posting a rate measurement for 07 STI injectors.

Quote:
Originally Posted by DomozitoLK View Post
I just got a set of 07 STI injectors from someone here on NASIOC. One side is labeled: "Denso 7DGID" and the other side "0580 725 08".

Does anyone have 06-07 WRX blue injectors that we can compare part numbers with so we can see if they are the same or different (since no one is 100% sure) ? Some people say the 07 STI vs. the 06-07 WRX blue injectors are different. Other searches say they are the same.



LMK, thanks!

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Old 08-16-2008, 10:47 AM   #59
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are PE 510CC's the same injector as sti pink 565cc's? does PE make the sti pinks?
what injector is recommended for a big 18g at stage 2?
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Old 08-16-2008, 06:38 PM   #60
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Quote:
Originally Posted by maxpowr View Post
are PE 510CC's the same injector as sti pink 565cc's? does PE make the sti pinks?
what injector is recommended for a big 18g at stage 2?

This is how it was explained to me. I ordered a set of "STIpinks" from a reputable vendor, when I got them they were indeed made by PE. Now when I called them asked them why they were not "subaru" so to speak he said that the JDM "STI Pinks" are made by PE and thats what I got. Hope this clears things up for you. As for the 18G question, I would go at least 650 or 750 to have enough headroom for tuning. I personally think Pinks are to small for an 18G.



PS, I think Denso makes the USDM Pinks, someone correct me if I'm wrong.
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Old 08-20-2008, 08:24 AM   #61
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What about this injector http://cgi.ebay.com/ebaymotors/Injec...mZ380055230517 is stated 600cc,same from Denso too.Is this for wrx07 or wrx08 model?
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Old 08-20-2008, 02:04 PM   #62
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This is not the eBay support forum, nor do we have one ASK THE SELLER
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Old 09-17-2008, 05:42 PM   #63
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Any info on N/A injectors ? People wanting to upgrade their N/A cars to run straight E85 need to get bigger injectors as well . Thanks
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Old 10-13-2008, 03:16 AM   #64
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Also for all the GC8 people out there, you can use the std Nissan side feed injectors.

Nismo provides 550s and also excellent 740s than have very similar lag times to the GC8s (if needed I can provide the infos for both injectors) The 740s can be modified up to 1050s and are also sold flowmatched.

They are bolt on to MY99/00 GC8s or can be used with some adaptors in pre 99 Imprezas. You can either find some Nissan plugs to fit them or modify slightly your cars one to fit or do complete new plugs.

Custom plugs



Modified Impreza plugs





Pre 99 setup + adaptors



Custom billet fuel rails (www.fecker.co.uk)





Hope this helps the GC8 people ..
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Old 02-03-2009, 11:20 PM   #65
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so 05 sti injectors wont fit an 02 wrx???
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Old 02-04-2009, 01:21 AM   #66
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Quote:
Originally Posted by ONE_1 View Post
so 05 sti injectors wont fit an 02 wrx???
nope, 02+ wrx used topfeed injectors and 04-06 sti uses side feed injectors. the 07 sti is topfeed and can be used with the wrx rails though
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Old 02-05-2009, 03:37 AM   #67
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The info from this post would be usefull to add I think.
http://forums.nasioc.com/forums/show...6&postcount=11
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Old 03-30-2009, 11:44 PM   #68
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Hey thanks for another great faq, I was wondering though about fuel pressure regulators. What are they, what do they do, and at which point should after market ones be used and why?



And another question I have is in regard to this post:
Quote:
Originally Posted by Unabomber View Post
Parallel does nothing. It was designed back in the day when people though there was fueling issue with specific Subaru cylinders. Now that we know it has to do with the exhaust design, there really is no need for the parallel mod except for those that like to modify for modify's sake. Real fuel rails are an upgrade as they have physically bigger hoses, so they will flow more. And by upgrade I mean that only for people who need them AKA the over 500 WHP crowd.
Is there a thread documenting any testing? I found this one http://forums.nasioc.com/forums/showthread.php?t=346413 which has a lot of info from vendors and designers on why it is hard to make a good after market fuel rail, but specifically what I'm curious about is what specific kind of improper exhaust is responsible for those cylindar failures, and what evidence there is that parallel fuel rails are not helpful (other then their increased flow capacity).

Also recently you posted in a thread I made in the newbie forums stating that I "would need fuel rails like a second butt hole". As much as I love to hear about my need for a second butt hole, this recommendation seems to be contradictory to what you have recommended in this thread, unless I misread/misunderstood things.

Last edited by sburck; 03-30-2009 at 11:58 PM.
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Old 03-31-2009, 03:10 AM   #69
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Re-read the first post. Two tuners talk about fuel rails being unnecessary. If you want into on the exhaust question, that is answered in the Header FAQ as there are links to the 4 channel EGT testing that shows that a full TBE and to a small degree headers fixes the issue. The only reason for rails is bling, high HP, or getting them to make things easier and cleaner under the hood.
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Old 03-31-2009, 11:18 AM   #70
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Ah thanks, I thought those 2 links went to manufacturer home pages or user homepages.
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Old 04-15-2009, 02:10 AM   #71
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It'd be nice to add Foresters to the list. From what I've found out, 04-05 are 500/535, they are yellow side feeds. 06+ are 565cc top feeds.
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Old 04-15-2009, 02:43 PM   #72
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Old 04-15-2009, 10:29 PM   #73
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WhyTF do people do that? Does anybody really need to know?
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Old 04-15-2009, 11:45 PM   #74
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Quote:
Originally Posted by Unabomber View Post
Re-read the first post. Two tuners talk about fuel rails being unnecessary. If you want into on the exhaust question, that is answered in the Header FAQ as there are links to the 4 channel EGT testing that shows that a full TBE and to a small degree headers fixes the issue. The only reason for rails is bling, high HP, or getting them to make things easier and cleaner under the hood.
That thread in the exhaust faq is amazing, nasioc should compile a list of threads that contain in depth research such as this. It's amazing what this community can collectively come up with and I wish I could just find all of these projects.
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Old 04-16-2009, 04:16 AM   #75
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Originally Posted by phils04wrx View Post
WhyTF do people do that? Does anybody really need to know?
YUP!!
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