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Old 03-13-2014, 07:47 PM   #1
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Default Should I (naturally aspirated) install bigger injectors now?

Like the title says.

Naturally aspirated, built engine, cop ignition, Megasquirt pnp gen1
headers, air intake. Stock fuel pressure reg, with a 190lph fuel pump

Probably wont be getting into my turbo project for another month.

Getting in some rx7 550cc

a few quick questions.
Should i install them now.
Obviously what would i need to change? fuel tables of course, and some engine constants. but what about spark tables? or AFR
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Old 03-13-2014, 07:58 PM   #2
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Do you want to run different AFRs with your bigger injectors? Do you want to run different ignition timing with your bigger injectors?
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Old 03-13-2014, 08:01 PM   #3
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Install, change req fuel, minor fuel retune, done.
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Old 03-13-2014, 09:16 PM   #4
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You should be installing some ev14 injectors. Do it once, do it right...
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Old 03-13-2014, 09:17 PM   #5
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yes, to compliment all those headerS
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Old 03-14-2014, 01:20 AM   #6
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I'd install them before i toss the turbo on. Also why not run e85? Err wait nvm rx7 injectors, uck.
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Old 03-14-2014, 02:04 AM   #7
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Quick answer from Emilio with my build for 150WHP, Nope... (99-00 used)

Now for turbo part, I did try RX7 injectors and they're junk.... bought 1000CC Injector dynamics and they idle like stockers.

By changing Req Fuel, AFR stay about the same so you can work with either injectors. At least RX8 injectors, they're far superior to RX7's
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Old 03-14-2014, 01:14 PM   #8
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Quote:
Originally Posted by joyrider View Post
Quick answer from Emilio with my build for 150WHP, Nope... (99-00 used)

Now for turbo part, I did try RX7 injectors and they're junk.... bought 1000CC Injector dynamics and they idle like stockers.

By changing Req Fuel, AFR stay about the same so you can work with either injectors. At least RX8 injectors, they're far superior to RX7's
So you guys are saying it is safe to run bigger injectors now?
Will i notice any type of power increase?

Also the injectors I am buying are from a member on this site. They are a little rough but he only wants 70$.
-You really think i should buck up and pay 30-50 more $ for rx-8 injectors? i may be able to locate some.
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Old 03-14-2014, 01:22 PM   #9
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Quote:
Originally Posted by joyrider View Post
Now for turbo part, I did try RX7 injectors and they're junk....
Well that makes me sad... didn't you buy my RX7 Reds? :(

Quote:
Originally Posted by zacktrotter_uncc View Post
So you guys are saying it is safe to run bigger injectors now?
Safe is relative. You have a megasquirt, right? You should be fine with something larger (as long as its not like a 850cc EV1 ) just retune for them, just like NiklasFalk said above.

Quote:
Originally Posted by zacktrotter_uncc View Post
Will i notice any type of power increase?
No. IF the ones you are moving too have a better spray pattern, you might see an efficiency increase, but that's about it. Be sure you have your deadtime/battery correction/latency configured correctly.

Quote:
Originally Posted by zacktrotter_uncc View Post
Also the injectors I am buying are from a member on this site. They are a little rough but he only wants 70$.
-You really think i should buck up and pay 30-50 more $ for rx-8 injectors? i may be able to locate some.
Yes, I'd spend the extra $30-50 for the Denso RX8s rather than the EV1 RX7s even if the RX8s are slightly smaller. What is your power goal again?

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Originally Posted by carnut169 View Post
You should be installing some ev14 injectors. Do it once, do it right...
^^ Best advice in this thread thus far. Propz
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Old 03-14-2014, 03:36 PM   #10
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Quote:
Originally Posted by EO2K View Post
Well that makes me sad... didn't you buy my RX7 Reds? :(


Safe is relative. You have a megasquirt, right? You should be fine with something larger (as long as its not like a 850cc EV1 ) just retune for them, just like NiklasFalk said above.

No. IF the ones you are moving too have a better spray pattern, you might see an efficiency increase, but that's about it. Be sure you have your deadtime/battery correction/latency configured correctly.


Yes, I'd spend the extra $30-50 for the Denso RX8s rather than the EV1 RX7s even if the RX8s are slightly smaller. What is your power goal again?



^^ Best advice in this thread thus far. Propz
Thank you sir for this reply, i like the way you actually read and answered my questions.
probably the nicest and most helpful response i've had while on this forum EVER props to you.

Also, right now im just slowly preparing for boost.
i will end up running low boost 5-8psi on an entry level kit, begi and misc parts.

thank you once again
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Old 03-14-2014, 04:29 PM   #11
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Guess I don't need to bring injectors to work to ship Monday after all?
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Old 03-14-2014, 04:30 PM   #12
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E02K, Please send me $70.
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Old 03-14-2014, 05:33 PM   #13
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Quote:
Originally Posted by Stein View Post
E02K, Please send me $70.
Well ****, now I feel even worse PM me your PP address.
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Old 03-14-2014, 06:53 PM   #14
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Quote:
Originally Posted by EO2K View Post
Well ****, now I feel even worse PM me your PP address.
pfft no biggie
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Old 03-14-2014, 07:58 PM   #15
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Quote:
Originally Posted by EO2K View Post
Well ****, now I feel even worse PM me your PP address.
Hey i saw these,

I know the seller did not say much on the add, but he did list the compatible vehicles as the 1.3l 2005 rx-8
are these the guys im looking for?
Mazda RX8 Yellow Fuel Injectors Original 2004 2005 2006 2007 2008 | eBay
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Old 03-14-2014, 08:15 PM   #16
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EOK yeah I think they we're from you. Not your fault, don't worry...

Rx8's worth the difference but so does injector dynamics IMHO. Depends how serious you want your build to be... Aids or awesomeness isn't the same price and quality.
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Old 03-14-2014, 08:17 PM   #17
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Quote:
Originally Posted by zacktrotter_uncc View Post
Hey i saw these,

I know the seller did not say much on the add, but he did list the compatible vehicles as the 1.3l 2005 rx-8
are these the guys im looking for?
Mazda RX8 Yellow Fuel Injectors Original 2004 2005 2006 2007 2008 | eBay
Those are the ones. Not saying, "THOSE are THE ONES", but they are the correct 425cc yellows referred to.
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Old 03-17-2014, 12:35 AM   #18
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Quote:
Originally Posted by DNMakinson View Post

Those are the ones. Not saying, "THOSE are THE ONES", but they are the correct 425cc yellows referred to.


You dont think i should buy that particular one?
To late i did
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Old 03-17-2014, 12:46 AM   #19
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It's ok. Your car probably won't spontaneously burst into flames.
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Old 03-17-2014, 08:50 AM   #20
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Quote:
Originally Posted by zacktrotter_uncc View Post
You dont think i should buy that particular one?
To late i did
You're fine. If they are in good shape, then a reasonable price. If the rubber parts need replacement, then they can be found. Just wanting to be plain, and perhaps add some humor (sometimes difficult to convey via text).

I am running the same Inj with good results N/A with MS3. Turbo is not in yet, but build is in progress.

The particular route I went was to buy some in rough shape for $10 each and then add $22 each to have them cleaned, checked, and the bits replaced. Pretty much same total $$.

Easy to change out. Just watch the little rubber spaces that go between the rail mounting tabs and the mounting surface (head or intake manifold, I don't remember which). When you pull the bolts and move the rail, they can fall out.
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