will i need a chip?
02-18-2006, 06:10 PM
#1
Rennlist Member
Thread Starter
will i need a chip?
Ok well... I am in the process of restoring a 944n/a. I am at the point where i just wish to make it run correctly.
The fuel injectors needed replacement so i figured as long as I was going to replace them i might as well get big ones. So i ordered 50# injectors.
I am also fairly sure that I am going to purchase a SciVision MAF system, and they recommend a 3.0bar FPR.
Will a 3.0bar FPR be enough for my 48# injectors? or should i just get an adjustable one? I would just get an adjustable but it seems a little unreliable and its also more than twice as expensive.
But if i just do a SciVision MAF and a 3.0 FPR and my new injectors will i require a new chip?
Thank You!
-Brett
The fuel injectors needed replacement so i figured as long as I was going to replace them i might as well get big ones. So i ordered 50# injectors.
I am also fairly sure that I am going to purchase a SciVision MAF system, and they recommend a 3.0bar FPR.
Will a 3.0bar FPR be enough for my 48# injectors? or should i just get an adjustable one? I would just get an adjustable but it seems a little unreliable and its also more than twice as expensive.
But if i just do a SciVision MAF and a 3.0 FPR and my new injectors will i require a new chip?
Thank You!
-Brett
Last edited by Calmchaos; 02-18-2006 at 06:41 PM.
02-18-2006, 06:24 PM
#4
Rennlist Member
your car will run like crap. You need to tell the DME what size injectors you have, hence the need for a new chip.
You might be better off buying an integrated system, rather than a hodge podge of parts...
You might be better off buying an integrated system, rather than a hodge podge of parts...
02-18-2006, 06:32 PM
#6
Three Wheelin'
Why did you order bigger injectors when you are not making more power? Is the maf kit even intended for a 944? There is not such thing as 50psi injectors, you probably mean 50 lb/hr.
Sounds like you should go back to stock stuff if you ever want the car to run right. That or do a lot of learning before ordering any more stuff.
Sounds like you should go back to stock stuff if you ever want the car to run right. That or do a lot of learning before ordering any more stuff.
02-18-2006, 06:39 PM
#7
Rennlist Member
Thread Starter
I do plan on making more power. But a problem has come up and I need the car to run as quickly as possible. I planned on making all the necessary upgrades. But the clutch in my truck is gone and I need 2 vehicles. And with the 48# injectors on the way i wanted to know what was necessary for the car to just run well enough to move from pt a to b.
Sorry.
And yes the MAF kit would be for the 944
Sorry.
And yes the MAF kit would be for the 944
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02-18-2006, 06:45 PM
#8
Racer
Hi,
Running bigger injectors will require a change on the chip. Depending on the change of injector size, we can set the scaling value on the chip to suit and you then select this vis your FQS switch. Quite simple.
Regards,
Andrew
www.promaxmotorsport.com
Running bigger injectors will require a change on the chip. Depending on the change of injector size, we can set the scaling value on the chip to suit and you then select this vis your FQS switch. Quite simple.
Regards,
Andrew
www.promaxmotorsport.com
02-18-2006, 06:47 PM
#9
Three Wheelin'
I see.
In that case I would re-use the stock fuel pressure regulator and injectors, if you have them. The custom chip that you will need to run your new ones will cost you more than some good used stock injectors. The maf and bigger fpr will add more complexity to the chips. Who did you plan on buying the chip from?
Sorry to come off as an *******.
In that case I would re-use the stock fuel pressure regulator and injectors, if you have them. The custom chip that you will need to run your new ones will cost you more than some good used stock injectors. The maf and bigger fpr will add more complexity to the chips. Who did you plan on buying the chip from?
Sorry to come off as an *******.
02-18-2006, 06:51 PM
#10
Race Director
you will need stock injectors to make the car run.
Big one will make the car run like crap. Hell even when you get a custom chip and a MAF the car won't make any more hp. That stuff alone does not make hp. There are no real bolt ons for the 944 NA that will make hp. None that I know of that would require or even take advantage of bigger injectors.
The bottomline is air flow. The 944 NA is fairly optimized for airflow. So while the injectors allow alot more fuel unless you get more air through the engine it make no difference. There are ways to increase the air flow in the 944 NA engine. Couple of them lead you to forced induction by either superchaging or turbo charging. Both of those would take advantage of bigger injectors.
The only other ways I know of to increase the flow in the NA engine are to start swapping cams, doing the right kind of head work or increasing displacement. None of which are really easy. Cams are a mixed bag often trading low end power for a few more hp up top. Headwork is tough since the obvious head work stuff has little impact. There are a few that can do it, but that skill comes at great expense. Displacement is always an option, but becomes very costly.
Big one will make the car run like crap. Hell even when you get a custom chip and a MAF the car won't make any more hp. That stuff alone does not make hp. There are no real bolt ons for the 944 NA that will make hp. None that I know of that would require or even take advantage of bigger injectors.
The bottomline is air flow. The 944 NA is fairly optimized for airflow. So while the injectors allow alot more fuel unless you get more air through the engine it make no difference. There are ways to increase the air flow in the 944 NA engine. Couple of them lead you to forced induction by either superchaging or turbo charging. Both of those would take advantage of bigger injectors.
The only other ways I know of to increase the flow in the NA engine are to start swapping cams, doing the right kind of head work or increasing displacement. None of which are really easy. Cams are a mixed bag often trading low end power for a few more hp up top. Headwork is tough since the obvious head work stuff has little impact. There are a few that can do it, but that skill comes at great expense. Displacement is always an option, but becomes very costly.
02-18-2006, 06:55 PM
#11
Rennlist Member
Thread Starter
If I were to buy the new FPR and remap the chip, could I put off buying the MAF for now?
I ask because I hear that the SciVision is supposed to self compensate to the system that I would be using?
Don't sweat it mark, I know you were just trying to keep me from making anything any worse. lol
Andrew, how much would it cost for scale a chip for just a FPR and 48# injectors?
I ask because I hear that the SciVision is supposed to self compensate to the system that I would be using?
Don't sweat it mark, I know you were just trying to keep me from making anything any worse. lol
Andrew, how much would it cost for scale a chip for just a FPR and 48# injectors?
02-18-2006, 07:00 PM
#12
Three Wheelin'
"Andrew, how much would it cost for scale a chip for just a FPR and 48# injectors?"
If it is more than the cost of used injectors (almost nothing), it is not worth it, since you will be getting no power increase.
The car will also run worse, since scaling the overall fuel down does not compensate for injector dead time and other variables that are effected by an injector change. Not a huge deal, but why pay to make the car worse?
If it is more than the cost of used injectors (almost nothing), it is not worth it, since you will be getting no power increase.
The car will also run worse, since scaling the overall fuel down does not compensate for injector dead time and other variables that are effected by an injector change. Not a huge deal, but why pay to make the car worse?
02-18-2006, 07:21 PM
#13
Rennlist Member
Thread Starter
So my best option at this time would be to return the 48# injectors, and get stock spec ones?
I'm not trying to argue with you guys im just looking for the quickest option. And if i will see no increase in power by completing the modifications i have mentioned, it's stupid to do them.
I'm not trying to argue with you guys im just looking for the quickest option. And if i will see no increase in power by completing the modifications i have mentioned, it's stupid to do them.