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Suggested Injector Size

 
Old 11-26-2007, 05:06 PM
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Default Suggested Injector Size

On a basicly stock greddy setup running 5-5.5psi what would be a good upgraded injector size? I'm selling the car soon so don't want to go crazy but figured if I picked up a set of 1.8L injectors and throw them in it would be cheap and effective. Not sure how big the 1.6L's are and how big the 1.8L's are so wasn't sure if I should just get larger than 1.8L's.

Reason being the car was leaning out slightly stock fuel setup with vortech fmu and 190lph pump. Wanted to see how different injectors would result. Same setup has been on the car for 2 years and no issues.
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Old 11-26-2007, 05:10 PM
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Any 1.8 is better than no 1.8. The NB 1.8 injectors are larger. Get what you can get cheap. I think there is a set forsale on m.net right now.
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Old 11-26-2007, 05:15 PM
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The 1.6 injectors are 230cc. The 1.8 injectors are 265cc. You are basically maxing out the 1.6's at about 6 psi.

What disc do you have in your FMU?
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Old 11-26-2007, 09:07 PM
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Originally Posted by supersaiyan93 View Post
The 1.6 injectors are 230cc. The 1.8 injectors are 265cc. You are basically maxing out the 1.6's at about 6 psi.

What disc do you have in your FMU?
Stock disc is still installed...believe the stock is 10:1 or something like that.
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Old 11-26-2007, 09:22 PM
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cool so now we know you have the ability to run about 90-100 psi of FP by 10psi giving the 230's headroom for 200 or so whp.
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Old 11-26-2007, 10:00 PM
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Originally Posted by magnamx-5 View Post
cool so now we know you have the ability to run about 90-100 psi of FP by 10psi giving the 230's headroom for 200 or so whp.
so with my current setup my guess is around 145whp with an intercooler and bipes. so why would I be leaning out something wrong with my current injectors or fmu?
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Old 11-27-2007, 10:53 AM
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If I remember right the stock disk is 12:1
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Old 11-27-2007, 11:37 AM
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where are you lean up top? on midrange tip in? please elaborate as to what you are experiencing. Notice my numbers are given 10 psi of boost to raise the Fuel pressure to 100 psi given 5-6 psi you have enough fuel for 200 whp still given a 10-1 disk or a little more given a 12-1 stock greddy disk but please tell us where you are lean this could be a base Fuel pressure issue a O2 clamp issue a dirty fuel filter etc. And tell us how you know you are lean as well.
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Old 09-20-2011, 09:47 AM
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I didn't feel like being a dick and starting a new thread, I plan on 9:1 forged internals, gt2860, valve springs for raised rpm, deshrouded valves, a slight polishing of the head and aim for 19 to 20 psi to stay under the diypnp bar limit. How big injectors will I need? I was thinking 600, but I'm probably wrong.
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Old 09-20-2011, 10:01 AM
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If you're planning on pump gas only and sticking with that turbo then 600 should be just fine
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Old 09-20-2011, 10:23 AM
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Is there a way to figure out an approximate amout of power I'll make? I just found a injector calculator. It said 600cc would be sufficient for 380 bhp. That can't be right?
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Old 09-20-2011, 10:37 AM
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You calculated with stock fuel pressure?
and 380bhp = ~320whp which should be over the upper limit of that 2860...
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Old 09-20-2011, 11:00 AM
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I just went from 550's to 660's for a little extra headroom, running right around the power you're shooting for. With a decent ECU to control the injectors you might as well go a little bigger than you're planning to need IMO.
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Old 09-20-2011, 11:07 AM
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660 will be perfect.
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Old 09-24-2011, 01:24 AM
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660s will do it, but ID1000s will idle as good or better and you will never need to upgrade.
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Old 09-24-2011, 05:22 AM
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I highly recommend the Fuel Injector Clinic 650cc EV14. They are so good, they idle better than the stock injectors. I can provide basemaps for these. If you need to go bigger, I can also provide basmaps for the 775cc and 850cc variants as well.
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Old 09-24-2011, 08:12 AM
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If you going to buy injectors there's absolutely no reason to buy anything other then ID1000s IMO. With a built motor your eventually going to want more and anything smaller will not give you room to expand.
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Old 09-24-2011, 08:23 AM
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I'm going to have problems with getting those bitches to idle aren't I? Not to mention the shitty fuel atomization of injectors that large?
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Old 09-25-2011, 02:00 AM
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Originally Posted by 85z28 View Post
I'm going to have problems with getting those bitches to idle aren't I? Not to mention the shitty fuel atomization of injectors that large?
Do us all a favor and quickly forget everything you've ever learned or assumed about fuel injectors.

You can idle ID1000s at stoich. They probably have a better spray pattern than the factory injector does. The IDs are dynamically matched, so low-speed driveability and idle quality will be extremely good.

In general, all of the downsides of big injectors are no longer a concern with EV14 injectors. You can have one set of injectors that will idle stoich, pass emissions testing, exhibit perfect driveability, and then support 500+whp on stock fuel pressure.
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Originally Posted by codrus View Post
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Old 09-25-2011, 12:48 PM
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not to mention impress all your friends.
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