Stock Injectors unable to run FULL E85
11-05-2019, 06:41 PM
#1
Member
Thread Starter
Stock Injectors unable to run FULL E85
I've read many different threads on how people are running full E85.
Gas station in San Diego I live next to out of the pump was around 71-76% E85 With injector duty cycle around 85% which i would say is high but fair~
I went up to my parents place in Carlsbad The shell gas station up there had E85 measured at 82-86% I was shocked i checked the duty cycle sure enough at WOT was 95%
Pulled over and filled up with some gas to lower it back down.
My Question is why does VRP sell this kit for being safe with stock injectors If they are running at 95%?
No Headers <------
K&N drop in filters
Straight piped from the cats back
Eurocharge V7 Tune
If i wanted to get headers down the road with E85 what CC injectors would be perfect? 630CC injectors that VRP sells?
Gas station in San Diego I live next to out of the pump was around 71-76% E85 With injector duty cycle around 85% which i would say is high but fair~
I went up to my parents place in Carlsbad The shell gas station up there had E85 measured at 82-86% I was shocked i checked the duty cycle sure enough at WOT was 95%
Pulled over and filled up with some gas to lower it back down.
My Question is why does VRP sell this kit for being safe with stock injectors If they are running at 95%?
No Headers <------
K&N drop in filters
Straight piped from the cats back
Eurocharge V7 Tune
If i wanted to get headers down the road with E85 what CC injectors would be perfect? 630CC injectors that VRP sells?
11-05-2019, 11:23 PM
#3
Not just VRP selling their kit, my car isnt happy on more than e60, gets hard to start, sometimes stalls immediately after starting and is jerky at low speed when using e85.
I doubt we get any advantage NA beyond e40 anyway so i usually run e50-60.
I doubt we get any advantage NA beyond e40 anyway so i usually run e50-60.
11-06-2019, 11:05 AM
#4
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Thread Starter
I don't have that issue with hard starts. Car fires up right on the spot just like it did before even with 83%. But then again San Diego doesn't get as cold as most places.
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AbsoluteGr8est (03-09-2020)
11-06-2019, 01:00 PM
#5
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2007 Mercedes E63 AMG
for the 4 months i ran e85 in san diego...ethanol reading from the pump never dropped below 81% ethanol. you can run at 95% duty cycle on your injectors, but it is just not recommended. above 98% is the danger zone.
11-06-2019, 03:27 PM
#6
Junior Member
The kits seem to work best on E85R. I ran a 12.3 @113 on Pilot 4S without the VRP kit. added the VRP kit and ran 11.9 @117.8 on Pilot 4S with E85R. two week later I ran 12.2 @ 115 on pump E85 @ 75%.
All on stock injectors. The injectors peaked at 90%. I have the VRP kit with stock headers with x-pipe, no secondary cats or resonator, V7 Eurocharged Tune (non-e-85), afe air filters.
All on stock injectors. The injectors peaked at 90%. I have the VRP kit with stock headers with x-pipe, no secondary cats or resonator, V7 Eurocharged Tune (non-e-85), afe air filters.
Last edited by AbsoluteGr8est; 11-07-2019 at 08:07 PM.
11-06-2019, 05:26 PM
#7
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Built 2008 G55 & one big 80 Series LandCruiser !
I assume you mean at 12.3 @ 123 mph ? not 133....
with headers and cooler plugs my rig starts rough when it's cold.... likely going to standard plugs shortly for the winter ( TX style- 25-70 degrees) last winter at 25 it wouldn't even catch....
E
with headers and cooler plugs my rig starts rough when it's cold.... likely going to standard plugs shortly for the winter ( TX style- 25-70 degrees) last winter at 25 it wouldn't even catch....
E
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11-07-2019, 06:44 PM
#9
Member
Thread Starter
95% Is something i would consider the danger zone lol. Not much headroom left.
The power is definitely noticeable which makes it addicting
12-26-2019, 01:34 AM
#12
Super Member
Why not raise fuelpressure and read log Longterm fueltrim, adjust pressure so it is near 0% in fueltrim?
This way you stretch the limits of the injectors and gain lower dutycycle.
I did it like this in my c55 i had before, worked just fine.
But i would consider build a return fuelsystem also as i did, i ran a aeromotive regulator and a walbro 450(this because i had supercharger also)
No,, i didn´t run stock injectors, but i needed to stretch the capacity some anyway
This way you stretch the limits of the injectors and gain lower dutycycle.
I did it like this in my c55 i had before, worked just fine.
But i would consider build a return fuelsystem also as i did, i ran a aeromotive regulator and a walbro 450(this because i had supercharger also)
No,, i didn´t run stock injectors, but i needed to stretch the capacity some anyway
12-26-2019, 06:05 PM
#13
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not possible to raiser fuel pressure. 2 reasons, we have a static fuel pressure system, 2, the computer is calibrated for this specific fuel pressure.
additionally, increasing fuel pressure can affect spray pattern. without knowing for sure, its generally not advisable.
additionally, increasing fuel pressure can affect spray pattern. without knowing for sure, its generally not advisable.
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serialpyro (12-27-2019)
12-27-2019, 04:12 PM
#14
Super Member
No problems rising the pressure, the regulator if it is similar to C55 is located in the tank, just delete it.
And place new adjustable in enginecompartment, then run a returnline.
I did it in my c55.
You can leave it with static pressure also, you do not need to plug in the reference signal(vaccum) on the regulator.
Just raise pressure til ltft goes to zero.
This will give you more capacity on the injectors.
And, affect spraypattern,, don't care about that, you are for gods sake doing mods that might demand ecu tune, and you can tune it to run correctly.
And, spraypattern often just gets better with higher pressure.
And place new adjustable in enginecompartment, then run a returnline.
I did it in my c55.
You can leave it with static pressure also, you do not need to plug in the reference signal(vaccum) on the regulator.
Just raise pressure til ltft goes to zero.
This will give you more capacity on the injectors.
And, affect spraypattern,, don't care about that, you are for gods sake doing mods that might demand ecu tune, and you can tune it to run correctly.
And, spraypattern often just gets better with higher pressure.
12-28-2019, 06:30 AM
#15
I don't understand. How a bigger pressure from the low pressure pump can give a bigger pressure or bigger outflow of the injector? This is the high pressure pump wich decides the final pressure.
12-30-2019, 05:14 AM
#17
Super Member
If it has a sensor, you probably can look away from my posts in this thread.
But there are some possibilites to alter the signal also to acheive higher pressure.
One can actually control the signal with a potentiometer as it probably just is an ordinary 0-5v signal.
A Friend of mine did it this way in an Opel Vectra OPC, it has this system with a sensor in the rail.
I googled a little:
M156 sensor:
Opel sensor:
But there are some possibilites to alter the signal also to acheive higher pressure.
One can actually control the signal with a potentiometer as it probably just is an ordinary 0-5v signal.
A Friend of mine did it this way in an Opel Vectra OPC, it has this system with a sensor in the rail.
I googled a little:
M156 sensor:
Opel sensor:
12-30-2019, 10:12 PM
#18
MBWorld Fanatic!
Yes running higher fuel pressures will make the injector larger technically. I would advise you run high fuel pressures from tuning rather than modifying the hardware and then going a step further and lying to the ecu about the fuel pressure sensor output signal. The real solution here is bigger injectors though.
12-30-2019, 10:51 PM
#19
Yes running higher fuel pressures will make the injector larger technically. I would advise you run high fuel pressures from tuning rather than modifying the hardware and then going a step further and lying to the ecu about the fuel pressure sensor output signal. The real solution here is bigger injectors though.
