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How far will 780cc injectors take me?

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Old Feb 19, 2008, 07:31 PM
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How far will 780cc injectors take me?

What types of turbo's will the PTE 780cc injectors work well with? I just want to know if these injectors will work with turbo's like the 50trim or 3076? I realize they'll be fine the Evo green which is also a possibility for me, I just don't want my injectors to hold me back if I install them now and get scaled and what not.

Any suggestions?
Old Feb 19, 2008, 07:42 PM
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they shoudl work becuase i ordered 780cc injkectors and i am going to run the BR 3065 kit which is bigger than both those turbos and ppl told me they woudl be fine
Old Feb 19, 2008, 07:48 PM
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There perfect.
Old Feb 19, 2008, 08:15 PM
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well then mine are off the market lol. Thanks for the help!
Old Feb 19, 2008, 08:23 PM
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A set of 780cc injectors would be plenty for the 3076R!
Old Feb 19, 2008, 08:24 PM
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ya im gunan do 3065 and they told me its plenty so ur all set
Old Feb 19, 2008, 08:46 PM
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I am using 780s on my 50trim.
Old Feb 19, 2008, 09:13 PM
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780s on my 35r (but i'm running 1000cc of meth with it... and i stopped turning up the boost at 29-30psi because i'm at 95% duty cycle at 7500 rpm). DLL estimated about 500whp.
Old Feb 20, 2008, 06:25 AM
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I'm going to run 850's on my stock turbo car (stockers are at 95% on current mods) - figure i will have enough injector for whatever i want to do in the future?

If your questioning 780's then just jump to 850's or 1000's and don't worry about it
Old Feb 20, 2008, 07:49 AM
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on 93 octane these were the results from my own car:

20g evogreen @ 26psi DLL 400awhp - 680's were fine

35R @ 28psi DLL 504awhp - 780's were at 120% IDC, AFR was 11.5 until 7000RPM where they moved towards the 12's regardless of how much fuel I threw at it in the fuel map.

35R @ 30psi DLL 534awhp - 880's are fine at 96% IDC with kenne bell boost a pump.
Old Feb 20, 2008, 09:33 AM
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Originally Posted by Mellon
35R @ 30psi DLL 534awhp - 880's are fine at 96% IDC with kenne bell boost a pump.
Since when is 96% duty cycle fine?

I have always thought and read that 85% is about the max you want to push an injector unless you want to live on the edge of failure.
Old Feb 20, 2008, 10:48 AM
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Originally Posted by travman
Since when is 96% duty cycle fine?

I have always thought and read that 85% is about the max you want to push an injector unless you want to live on the edge of failure.
the IDC calculation isn't accurate....naturally you can't physically flow more that 100% IDC, that would mean the injectors at static and spraying all the time. Notice I mentioned earlier that I didn't begin to lean out until 120% IDC

EVOm is no different than any other forum...there's some old hands that said this and that a long time ago and it's been regurgitated through the ages. Sometimes you have to ignore the gospel and figure out what works on your own.

Just like when I was told you can't go beyond 680cc injectors on the stock ECU by a reputable tuner on this forum less than a year ago

Last edited by Mellon Racing; Feb 20, 2008 at 10:50 AM.
Old Feb 20, 2008, 11:25 AM
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Chris you have a PM. Interesting data that you have there as well.
Old Feb 22, 2008, 01:56 PM
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Originally Posted by Mellon
the IDC calculation isn't accurate....naturally you can't physically flow more that 100% IDC, that would mean the injectors at static and spraying all the time. Notice I mentioned earlier that I didn't begin to lean out until 120% IDC

EVOm is no different than any other forum...there's some old hands that said this and that a long time ago and it's been regurgitated through the ages. Sometimes you have to ignore the gospel and figure out what works on your own.

Just like when I was told you can't go beyond 680cc injectors on the stock ECU by a reputable tuner on this forum less than a year ago
I've been doing the calculations manually on travis's car. He is flat out of injector. His car leans out up top (even with a proper pump).

I don't like pushing the duty cycles because when you do long hard pulls you really stress the coil to heat up and failures can occur. I try to stay under 80% but typically run up to 90% as I make more power than I intend. I've had friends run years on stock injectors saturated going down the track with no failures. I've also raced a turbo honda that lost a motor pushing the injectors pretty hard and he lost it after only a week.

I've been saying since the Ecuflash forum started a lot of ****. In the end it all turns out to be true. One of them is you can run any size injector just as well as a standalone and usually better than an AEM. I run 1000's on a cammed DSM with enough base fuel pressure that they look like 1200's to the ecu. It'll start and idle fine in freezing weather with a mini battery every time.

So yeah, experience says don't push injectors. Its your engine or your customers so I personally don't care, just saying.

You can easily run 1000+cc injectors on the stock ecu. I actually think 1600's would be fine.
Old Feb 22, 2008, 01:58 PM
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I think you missed the point... the calculation is wrong, hence we aren't really running over 80-90% on the cars I'm working with.


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