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Old 06-13-2007, 12:19 AM   #1
C J
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Default Fuel Injector Size Questions

Ok I am thinking about upgrading to a TD05H 20G for a bit more power and top end for the STi without going crazy. I cannot find a writeup here though that shows what injector sizes are most commonly ran with different turbo configurations. I have been to the deatschwerks website since they do a core refund for my stock injectors.

My question is....will a 550cc injector be large enough to support a 20G or do i need to go with 720cc (more $$$). I am hoping to just beable to run safely with 550's and a fuel pump upgrade. Let me know!
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Old 06-13-2007, 12:23 AM   #2
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You will want to go to the 720's or nismo 740's. As to my understanding the vf39 w/ good tuning close to it's limits will max or almost max out the stockers. Plus you really don't want to get into the problem of not having enough injector. Just my $.02
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Old 06-13-2007, 12:28 AM   #3
C J
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What is the stock injector sizing?
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Old 06-13-2007, 12:49 AM   #4
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Quote:
Originally Posted by C J View Post
What is the stock injector sizing?
565cc i believe....

like the last person said....go with 720s/740s to be safe at least.....or even go with some 816's, 850s, etc... incase your decided to up the boost and power a little bit and require a lot more fuel
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Old 06-13-2007, 01:51 PM   #5
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Most of our customers with a similar turbo use the 740's.
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Old 06-13-2007, 01:58 PM   #6
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Quote:
Originally Posted by DeatschWerks View Post
Most of our customers with a similar turbo use the 740's.
What size do you recommend for a 20g turbo?

What size do you recommend for a fp green turbo?
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Old 06-13-2007, 02:09 PM   #7
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740 or 850 power enterprise injectors. You will also need a Walbro 255 fuel pump.

CLark
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Old 06-13-2007, 02:36 PM   #8
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Attention new guy to the NASIOC forums.....read the sticky threads. All of your answers are in the sticky threads. Please stick to the Newbies and FAQ forum until you get the hang of what and where to post. Weve been discussing injectors here since like 1999 or so and we've pretty much covered all of the questions and they are inside one of the sticky threads. Moving to Newbies...
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Old 06-13-2007, 05:42 PM   #9
C J
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i swear this guy moves everyone of my threads. Oh well if the search feature worked on this forum i wouldnt have to post. Search fuel injectors or fuel injector size and you get pages of useless information and no link to any kind of sticky threads.
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Old 06-13-2007, 06:06 PM   #10
RP31
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And the FAQ makes no mention of the answer to the question you posed in your first post. This thread contained nothing but useful information until post #8.

Unabomber, if you spent half as much time updating your FAQs with the information that you claim is in them, as you do telling people to read them and moving threads around, your posts might have a bit more credibility.

OP, this does not forgive your lack of searching though. Search the 2.5L Turbo forum for "20G injectors" and you'd get all of this info. A thread telling you exactly what was described in this one can be found about half way down in the search results.
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Old 06-13-2007, 08:42 PM   #11
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Quote:
Originally Posted by C J View Post
i swear this guy moves everyone of my threads. Oh well if the search feature worked on this forum i wouldnt have to post. Search fuel injectors or fuel injector size and you get pages of useless information and no link to any kind of sticky threads.
When I say read the sticky threads, I don't mean make a cursory search, I mean:

Go to them.
Click them.
Read them.

Had you done so, you would have found the following post at the top of this forum, the 2.0L forum, and the 2.5L forum.

http://forums.nasioc.com/forums/show....php?t=1218460

Quote:
Originally Posted by RP31 View Post
And the FAQ makes no mention of the answer to the question you posed in your first post. This thread contained nothing but useful information until post #8.

Unabomber, if you spent half as much time updating your FAQs with the information that you claim is in them, as you do telling people to read them and moving threads around, your posts might have a bit more credibility.
Here's a quote from my FAQ, perhaps you should read it again and familiarize yourself on how to give advice on this subject in the future.

What are the best fuel injectors? Fuel injectors should be purchased based on the best possible match between the flow rating and needs of your aftermarket turbo. This should be a determination by your tuner to provide the best possible match. It is better to opt on the side of too large if there is any possibility of maxing out the injectors with your upgrade plans. Bigger is not always better with injectors so it is always best to purchase injectors best suited for your application and upgrade as need as opposed to starting off too large. This online calculator may assist you in the decision process. This post by hotrod will also help. As well, ask your tuner for his recommendation on brands. It will be cheaper to buy the brand he is familiar with rather than wasting dyno time + tuner fees while he fiddles around with your rogue brand injectors.
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