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E85 & injectors

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Old Nov 10, 2008 | 10:28 AM
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Default E85 & injectors

Tried E85 over the weekend and working good. Was able to add some timing up top and boost comes in sooner and engine load at cruise is down. The only issue is my injectors are maxing out, I got up to 149% inj duty cycle.
What size injectors you guys think I need to keep under 100%?
I'm running 8lbs boost.
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Old Nov 10, 2008 | 10:55 AM
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75's will get you to over 500whp with e85 and still be in the 80% duty cycle range.
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Old Nov 10, 2008 | 02:28 PM
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Whats the largest high impedence you can run and tune properly?
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Old Nov 10, 2008 | 03:37 PM
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You can get 79's, it will not be exactly super easy to tune but it can be done.
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Old Nov 10, 2008 | 03:45 PM
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why not easy to tune ^ ^ ^

also i want to run 1000wrhp on e85.

if i do two sets of injectors will that work
set one - 60lbs
set two - 60lbs

and keep both high impedance. have second set turn on at 11 psi

then i can run around on 10psi on street
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Old Nov 10, 2008 | 04:01 PM
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Originally Posted by hellbents10
You can get 79's, it will not be exactly super easy to tune but it can be done.
I'm not an expert at tuning, but I was under the impression that I would only need to plug in the new values and upload them to the PCM.
I'm using HPTUNERS software.
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Old Dec 3, 2008 | 05:38 PM
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Did some research and found out plugging in the values for injectors this big is needed along with tweking some other values. Found the info on the hptuners.com forum
http://www.hptuners.com/forum/showth...70lb+injectors
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Old Dec 3, 2008 | 06:05 PM
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There is always more to it, not a biggy though.
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Old Dec 3, 2008 | 07:50 PM
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I switched to 75lb injectors (from 50's) and have had no idle problems that couldn't be tuned out easily. It's getting the big injectors to idle and low-load cruise that can be difficult.

Jim
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Old Dec 3, 2008 | 08:32 PM
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I have twin 255 pumps big fuel line aem rails boost reference regulator with 60lb injectors, running out of fuel over 5000 rpm. Car is making 581hp and 596lb ft on e85 on a dynamics dyno. I am at 11psi also, think about going to some 95lb injectors soon.
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Old Dec 4, 2008 | 09:04 AM
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I have a set of brand spankin new flow matched 95lb Acceleronics for $390 shipped
with paypal fees if anyone needs a set.

Looking for 120's now...

FWIW - if you fellow E85 guys need guidance on injector sizing, I suggest using the calculator on the rc engineering website per the sticky at the top of the fueling section. http://www.rceng.com/technical.htm
Use .85 as the BSFC number to see what injectors to run on E85 !!!


edited, added link

Last edited by camarols1; Dec 4, 2008 at 10:55 AM.
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Old Dec 4, 2008 | 09:21 AM
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How did you run the 96's withthe stock pcm?

I may be interested in em....
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Old Dec 4, 2008 | 10:19 AM
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Originally Posted by 1320
How did you run the 96's withthe stock pcm?
Impedance converter. They run about $250ish.....
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Old Dec 4, 2008 | 10:31 AM
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Originally Posted by camarols1
I have a set of brand spankin new flow matched 95lb Acceleronics for $390 shipped
with paypal fees if anyone needs a set.

Looking for 120's now...

FWIW - if you fellow E85 guys need guidance on injector sizing, I suggest using the calculator on the rc engineering website per the sticky at the top of this section.
Use .85 as the BSFC number to see what injectors to run on E85 !!!
Where is the cal? I have the big magafuel pump to support 1500hp so I have the pump. I have the injector driver.

However I am lost to what size injectors I will need to support 1200rwhp. I was thinking 160lb but if 120lb will do it. Ideas?
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Old Dec 4, 2008 | 10:42 AM
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On E85 you will need 160's at the least. You will need to run them at about 60psi base to keep the duty cycle below 100. Also you will be out of pump assuming you will be making 1350fwhp. I use a BSFC of .9-.95 when using e85 with FI, .85 is better suited to a NA eng. Maybe a supercharged engine on a stretch, defiantly not a turbo engine.
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Old Dec 4, 2008 | 11:07 AM
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Originally Posted by hellbents10
On E85 you will need 160's at the least. You will need to run them at about 60psi base to keep the duty cycle below 100. Also you will be out of pump assuming you will be making 1350fwhp. I use a BSFC of .9-.95 when using e85 with FI, .85 is better suited to a NA eng. Maybe a supercharged engine on a stretch, defiantly not a turbo engine.

Thanks for the input !
BTW~ I am running a belt driven pump to ensure proper flow.
I am trying to avoid the jump to 160's so that I can still drive on gas if I get stuck between E85 stations and have to run 93 in it to get home.
I am thinking the belt drive will allow me to crank up the fuel pressure for my E85 tune to get the most out of the 120's.
I'm not as greedy as 1INSANEGTO, as I am only looking for 1200 at the crank!

Jim
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Old Dec 4, 2008 | 11:18 AM
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1200 at the crank could work with enough base pressure. What pump are you running, belt drives rock.
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Old Dec 4, 2008 | 11:20 AM
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You mean acceleronics? Or are there others also? Any preference, good or bad , tuning difficulties? Pm me any info or post it please.
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Old Dec 4, 2008 | 11:23 AM
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they make 96lb High Imp injectors now.... But they are not cheap, somewhere in the $1000 range!
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Old Dec 4, 2008 | 11:39 AM
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Originally Posted by hellbents10
1200 at the crank could work with enough base pressure. What pump are you running, belt drives rock.

One of these...
Aeromotive pump bolted to a truck a/c compressor bracket.
The bolt holes for the a/c tensioner line up with the bracket for the pump.


I have heard the 96's I have could hang with 100+ base pressure.
Does anyone have thoughts on the max working pressure of 96's or 120's?
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