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Old 01-29-2009, 07:32 PM   #1
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Default 1000cc injectors

So, I am looking to order some larger injectors. However, 1000cc injectors don't seem to be as easy to find as 550's. According to Braineack's faq, 7mgte injectors are the same as miata injectors. Following that logic, I have found these injectors. Before I order these, I want to make sure that they will fit. If you have any other advice or suggestions, please let me know

Thanks in advance,
Wes
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Old 01-29-2009, 07:58 PM   #2
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1000cc. WOW!
I neverlooked for any that big, but RC SH4-750D worked great for me.
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Old 01-29-2009, 08:05 PM   #3
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My ultimate goal is 400whp. This isnt going to happen any time soon but i am on my 4th set of injectors now and i only want to buy one more. Therefore, i plan on going with 1000cc to give me the headroom i need to get to my power goal.

(440 crank HP * .63 B.S.F.C)/ (4 injectors * .8 DC) = 86.6 lb/hr * 10.5 cc/min =909cc/min

I am estimating crank hp and BSFC obviously.
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Old 01-29-2009, 08:30 PM   #4
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Did you check with our sponsor vendor Deatschworks? They have up to 1600cc injectors listed for the RX7 which should be compatible.

I like to always check with the forum sponsors first. If you find a better deal they might even match it.

Throw 'em a bone.

my two pennies...
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Old 01-29-2009, 08:36 PM   #5
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Think you can actually have a stable idle with 1000cc injectors?
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Old 01-29-2009, 08:44 PM   #6
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I'll buy your 550's when you upgrade to 1000's
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Old 01-29-2009, 08:45 PM   #7
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What are you using for engine management? 1000 cc is more than you need for you HP goals. Bigger is not always better with injectors.
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Old 01-29-2009, 08:49 PM   #8
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I have almost brand new 1000 cc/min injectors. I idled at between 12:1 to 13:1 AFR.

PM me offer.
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Old 01-29-2009, 09:15 PM   #9
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Quote:
Originally Posted by karter74 View Post
Think you can actually have a stable idle with 1000cc injectors?
I am going to try it with lo-res code and see if i can iron it out. It may work if i do low impedance. If not, i will go to hi-res and get it worked out that way. Justin at diyautotune said that i would need to add resistors to run hi-res with low impedance injectors which kinda sucks but i'm sure i will be able to work it out.
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Old 01-29-2009, 09:17 PM   #10
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Quote:
Originally Posted by mikef85 View Post
I have almost brand new 1000 cc/min injectors. I idled at between 12:1 to 13:1 AFR.

PM me offer.
PM sent
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Old 01-29-2009, 09:53 PM   #11
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Quote:
Originally Posted by wes65 View Post
I am going to try it with lo-res code and see if i can iron it out. It may work if i do low impedance. If not, i will go to hi-res and get it worked out that way. Justin at diyautotune said that i would need to add resistors to run hi-res with low impedance injectors which kinda sucks but i'm sure i will be able to work it out.
before you pick hi res or low impedance, check which will allow you to run a shorter fuel pulse. or better yet, upgrade to MS2Extra
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Old 01-29-2009, 10:28 PM   #12
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before you pick hi res or low impedance, check which will allow you to run a shorter fuel pulse. or better yet, upgrade to MS2Extra
Unless my thinking is wrong, both will allow me to run a shorter fuel pulse. The low impedance injectors have a shorter opening time. The hi-res code is more precise. I am still pretty new to MS so i dont really know what's involved with upgrading a mspnp to ms2extra.
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Old 01-29-2009, 11:58 PM   #13
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Quote:
Originally Posted by wes65 View Post
Unless my thinking is wrong, both will allow me to run a shorter fuel pulse. The low impedance injectors have a shorter opening time. The hi-res code is more precise. I am still pretty new to MS so i dont really know what's involved with upgrading a mspnp to ms2extra.
true on both counts, however, as you mention above you're required to run a resistor pack if you run the hirez code. running the resistor pack essentially turns your low impedance injectors into high impedance injectors and you lose the fine control advantage.
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Old 01-30-2009, 12:01 AM   #14
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Quote:
Originally Posted by y8s View Post
true on both counts, however, as you mention above you're required to run a resistor pack if you run the hirez code. running the resistor pack essentially turns your low impedance injectors into high impedance injectors and you lose the fine control advantage.
So i guess the real question is, which gives you better control? hi-res high impedance or lo-res low impedance?
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Old 01-30-2009, 12:22 AM   #15
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I'd think at some point you'd shovel over to batch fire. You've got so much fuel going in there anyway whats it going to matter?
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Old 01-30-2009, 12:25 AM   #16
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I'd think at some point you'd shovel over to batch fire. You've got so much fuel going in there anyway whats it going to matter?
I was under the impression that they were already using batch fire.


Whenever you get your car turbo'd i would love to come take a look at it.
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Old 01-30-2009, 12:35 AM   #17
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You'll have hell idling 1000cc low ohm injectors w/resistor pack with high res. You need to run them as low ohm. MS2. Besides, I was gonna buy mikes injectors this summer.
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Old 01-30-2009, 01:10 AM   #18
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Quote:
Originally Posted by patsmx5 View Post
You'll have hell idling 1000cc low ohm injectors w/resistor pack with high res. You need to run them as low ohm. MS2. Besides, I was gonna buy mikes injectors this summer.
I'm not planning on getting rid of them until the price is right. People like to compare the stuff I buy to ebay specials.

I could always use them on another 4 cylinder build, but i've pretty much decided I would never waste my money building another 4 cylinder motor........
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Old 01-30-2009, 02:03 AM   #19
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Quote:
Originally Posted by wes65 View Post
I was under the impression that they were already using batch fire.


Whenever you get your car turbo'd i would love to come take a look at it.
Probably be a very long time from now!

I've done plenty of turbo cars before, although I think a Miata would be a whole other planet. I'm happy just tearing my car apart for R&D and fitment. I always got a kick out of the engineering and design more then the drive. Its weird can't explain it. Where do you live at? I actually live in Georgetown.

On a look at the math it doesn't seem like batch makes any difference what so ever, because your just extending the injection cycle past IVC anyways in performance applications.

At first look I thought the equation had something missing form it, but it is solid for every situation. Its just hard to believe you need a 1dm^3 injector

Your idle should be around .5ms of open time. Every .1ms you add is like adding .5 ms to the stock injectors. 2.3ms 2.8ms or 1.8ms. That is a serious adjustment!
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Old 01-30-2009, 02:08 AM   #20
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georgetown ky i assume? I go between jeffersonville and madison, indiana
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