injectors and FPR installed
injectors and FPR installed
Hey everyone,
I just got my long awaited 300cc injectors and 1.7:1 rising FPR from Vision Imports today. I also installed them. I believe i'm going to get it dyno tuned tomorrow and get some serious numbers out.
I just got my long awaited 300cc injectors and 1.7:1 rising FPR from Vision Imports today. I also installed them. I believe i'm going to get it dyno tuned tomorrow and get some serious numbers out.
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Joined: Apr 2002
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From: Kilorado
congrats, my buddies Saab project car really responded much better after teh FPR was put on. He claimed lag was eliminated but I drove it, it was merely greatly reduced. Can't wait to see your dynochart.
Evolved Member
Joined: Apr 2002
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From: Kilorado
higher CFM injectors (CFM=Cubic Feet per Minute) push more fuel, a FPR (Fuel pressure Regulator) helps to maintain a constant stream of fuel and is necessary to utilize the capability of higher flow injectors.
http://www.howstuffworks.com/turbo.htm
God, I love this site.
Congrats. Hope they eliminates any and all fuel problems. I don't remember if anyone else asked, but what are your intentions as far as possibly raising the boost?
God, I love this site.
Congrats. Hope they eliminates any and all fuel problems. I don't remember if anyone else asked, but what are your intentions as far as possibly raising the boost?
Evolved Member
Joined: Apr 2002
Posts: 697
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From: Perth, Western Australia
The FPR unit as well being a rising rate unit for 1 psi of boost the FPR unit will also raise the fuel pressure by another 1.7 psi which is perfect for cars with turbo's to help stop leaning them out.
David Thomas
www.rpw.com.au
David Thomas
www.rpw.com.au
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Evolving Member
Joined: Oct 2002
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From: Third rock.
Mr Thomas,
Interesting shop you have there! I especially appreciate your Galant drag car. I have begun a project based on the same generation Lancer. Working a VR4 engine turned the right way around with a hybrid turbo. I chose a GEMS computer as I am familiar with them from my E5 GSR. I may have to ask for your help sometime.
General Public,
For anyone interested in learning more about car tuning and performance I would highly recommend “21st Century PERFORMANCE”, by Julian Edgar. It will help dispel many misperceptions that abound regarding go fast cars.
Interesting shop you have there! I especially appreciate your Galant drag car. I have begun a project based on the same generation Lancer. Working a VR4 engine turned the right way around with a hybrid turbo. I chose a GEMS computer as I am familiar with them from my E5 GSR. I may have to ask for your help sometime.
General Public,
For anyone interested in learning more about car tuning and performance I would highly recommend “21st Century PERFORMANCE”, by Julian Edgar. It will help dispel many misperceptions that abound regarding go fast cars.
Evolved Member
Joined: Apr 2002
Posts: 2,167
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From: TB, FL
Why use 300cc injectors? At max, you can barely hit 200 HP before the injectors get stuck.
Go to RC engineering site and plug 300cc into their formula . . . you will plateau around 200 HP and no more, because injectors will get stuck. All injectors cannot go beyond 80% cycle duty. I'm not making this up . . . it's a fact.
Go to RC engineering site and plug 300cc into their formula . . . you will plateau around 200 HP and no more, because injectors will get stuck. All injectors cannot go beyond 80% cycle duty. I'm not making this up . . . it's a fact.
Evolving Member
Joined: Oct 2002
Posts: 152
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From: Third rock.
Stuck injectors? 80% duty cycle limit?
Help me out here. Set me straight before I damage my car. I regularly run my injectors beyond 80% duty cycle. I thought that increasing fuel pressure allowed higher rates of fuel delivery with stock injectors anyway.
Help me out here. Set me straight before I damage my car. I regularly run my injectors beyond 80% duty cycle. I thought that increasing fuel pressure allowed higher rates of fuel delivery with stock injectors anyway.
braf
Running your duty cycle beyond 80% is bad in two ways; one if the injector gets stuck in an open position you'll lose the spray pattern and dump more fuel than can be properly combusted and you'll lose hp.
On the other hand a worse case scenario can happen if the injector remains stuck in a closed position, which no fuel is being administered and a lean detonating condition will occur in which you'll lose hp again and worse maybe your engine too.
How are you monitoring your duty cycle? Do you have a real time data logger or engine management system that shows this?
Also increasing your fuel pressure will only increase the injectors flow rates a minimum amount but will greatly increase strain on opening the injectors. eg. a 24lbs. injector at 30psi. will flow 25lbs. at 40psi. of fuel pressure.
F2=(P2/F1) 0.5xP1
F2= new fuel flow rate
F1= original fuel flow rate
P2= new fuel pressure
P1= original fuel pressure
40psi/24lbs./hr. x 0.5 x 30psi = 25lbs./hr.
zlancer
Although 300cc injectors aren't that big and will not support a massive amount of hp, you shouldn't run injectors larger than can be controlled by your ecu, or your AFC. I don't know how much of the duty cycle can be cut by using your AFC, but with larger injectors such as 550cc or 720cc you need to have the duty cycle cut down below 1.4ms, probably even lower just to fire the engine much less even having a decent idle. My advice is until you can properly control the injectors don't run them too big.
Running your duty cycle beyond 80% is bad in two ways; one if the injector gets stuck in an open position you'll lose the spray pattern and dump more fuel than can be properly combusted and you'll lose hp.
On the other hand a worse case scenario can happen if the injector remains stuck in a closed position, which no fuel is being administered and a lean detonating condition will occur in which you'll lose hp again and worse maybe your engine too.
How are you monitoring your duty cycle? Do you have a real time data logger or engine management system that shows this?
Also increasing your fuel pressure will only increase the injectors flow rates a minimum amount but will greatly increase strain on opening the injectors. eg. a 24lbs. injector at 30psi. will flow 25lbs. at 40psi. of fuel pressure.
F2=(P2/F1) 0.5xP1
F2= new fuel flow rate
F1= original fuel flow rate
P2= new fuel pressure
P1= original fuel pressure
40psi/24lbs./hr. x 0.5 x 30psi = 25lbs./hr.
zlancer
Although 300cc injectors aren't that big and will not support a massive amount of hp, you shouldn't run injectors larger than can be controlled by your ecu, or your AFC. I don't know how much of the duty cycle can be cut by using your AFC, but with larger injectors such as 550cc or 720cc you need to have the duty cycle cut down below 1.4ms, probably even lower just to fire the engine much less even having a decent idle. My advice is until you can properly control the injectors don't run them too big.