Here's the deal, i have my truck, it's paid for and its exactly how i want it (besides being gutless) so i don't want to trade it in and take a hit.. got an 02 quad cab 4x4 with manual trans and 4.7 engine. I am in process of custom installing twin turbo's on it. My question is this: I was plan on using a rising rate fuel pressure regulator and aftermarket fuel pump. I would have to add a fuel return line and disable the stock fuel pump for this to work. Is there someone or some tuners in the Houston TX area that could just remap the ecu for boosted applications with larger fuel injectors? I've got the first manifold about 40% complete and they should look something like this. Thanks for the help

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Why do you need to disable the factory pump? It's a passive pump, so if your aux pump is pumping more fuel than the factory one, it will just suck past it.

 

Factory fuel pump has integral fuel pressure regulator inside the tank; the fuel system is a returnless fuel system. If i cannot get the engine control module reprogrammed for boost compensation, then my other choice is to use a rising rate fuel pressure regulator that raises fuel pressure by choking off the return line from the fuel rail (vacuum/boost line hooked to fpr determines this). You can't raise fuel pressure at the rail with the factory pump/fpr and have it boost compensated. At least I don't think you can, i haven't actually tore into the factory pump to see if it can be modified.

 

rtkota5point9 i see what you are saying now...i didn't want to mess with adding another 20 amp fused supply...but it's probably alot easier....

 

There are some people that will do ECU flashes but I wouldn't do it with your application. Since you are using a turbo set up a reflash would be too hit or miss. I would go with the FMU set up you are talking about.

Just remove the old fuel pump and put in one of the high output pumps. The fuel rails are easy to tap into and put a return line on. The hardest part is adjusting the FMU. You can either pay for expensive dyno runs or you can put on a A/F monitoring system on the truck. I like the ones from Innovate Mortorsports. They have a system that can monitor just about everything with a data logger so you can tune the car yourself. Plus you know when something is going bad before you cause engine problems.

If you are going to be going over 10lbs of boost I would use bigger injectors with the FMU.



My Durango runs 9psi with a reflash and 24lb injectors and a fuel pump that is 55lb/hr. I am fixing to put on the Innovate wideband sensor and gauge, then the FMU with return line so I can actually tune my car. I have no idea what the reflash acutally did as it was done by the Shelby builders during its assembly.

Make sure you put on a boost retard on you car too or you will definately have problems.

 

Mike954...Thanks for the advice..I have already installed the wideband commander & autometer electric boost/vac gauge...i can now log throttle position, boost, A/F ratio & RPM simultaneously with the wideband commander...I'm guessing stock injectors are 20 lb/hr?? Which boost retard do you recommend?...I'm going to start small on the boost, around 5 psi then go from there. I also plan on new cams..have any suggestions on this? Is there much gain from porting & polishing these 4.7 heads? Sorry for all the questions...I just did my first port and polish on my C5 vette's throttle body, so i'll probably have to do this on the dodge also...It was pretty easy...[sm=icon_cheers.gif]

 

Well, its UGLY but it's about 95% complete... this is the LH turbo manifold...I'll clean it up later...[sm=icon_cheers.gif]

I'll start on the RH next weekend...gotta finish the vette work first!!

 

My truck has the MSD 6BTM on it, at 5psi I would not worry too much about retarding if the A/F ration is good.

I just took mine to a dyno shop and found out that I am runnig rediculously lean under boost. I knew that I was running somewhat lean but not this bad!!!

I am not sure a Rising Rate Reg. will be enough to compensate for this so I am looking into a piggy back system that will allow me to run much bigger injectors. I am looking to see if Greddy's E-manage will work since Dodge like to use map sensors.
I think that I may still run a return line with aR.R. Reg. first to see how much it helps with the stock injectors.


I would not worry too much about porting your heads and getting a different cam until your car is up and running well. When all of the work was done to my truck the fuel system was never addressed and therefore it was all poinltess because it does not make the power it is supposed too.

Plus save you mney for bigger injectors, you will definately need them even at 5psi. My previous comment was way off, I said it thinking my truck was only slightly lean.

 

Nasty check out A'PEXI's AFC NEO piggy back, it is what I think I am going to try! It interupts the signal coming from the map sensor and will let you program your own signal to the computer in open loop and closed loop in I think 200rpm increments. I hoope this will alow me to run injectors in the 40lb area without using the RR regulator. I am doing more research but it looks like it will work.

 

Thanks Mike...I took a quick look at the apexi neo...looks like that would work good, but i might even go a different route to save a little money..Aeromotive p/n 16303 fmu...probably not ideal like the apexi, but i think it would work and i already have a walbro inline fuel pump...

Well, here's manifold #2 all tacked together..[sm=icon_cheers.gif]




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