I have 750's, 255 pump, and my SAFC 2 which is pulling mad fuel. I have no problem going with a return system, but before I do, are there any alternatives that will allow you to reduce/regulate the stock fuel pressure while maintaining the stock fuel system? Sorry if this is an ignorant question.
Since my car is supposedly adding too much timing, how much timing is too much on these motors?
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I know about that mod (currently viewing the FPR MOD thread) but can it reduce FP? I def don't need to increase it.
no u cant reduce it only increase... i swapped out the 85 psi unt and s2 injectors for the sock fuel pressure regulator and rc 750's and the car drove so much smoother...
returnline> FPR mod
I know about that mod (currently viewing the FPR MOD thread) but can it reduce FP? I def don't need to increase it.
no u cant reduce it only increase... i swapped out the 85 psi unt and s2 injectors for the sock fuel pressure regulator and rc 750's and the car drove so much smoother...
returnline> FPR mod
Yeah, I figured that. It would be nice to have some way of reducing FP w/out going return. I'm switching from SAFC to E-Manage to get some control over the 750's. Hopefully this will help out.
You guys made up my mind and I'm going w/ the return line and the 255 and the aeromotive fpr. I have the S1, ripped out almost all the vacuum lines, safc-2 and all supporting mods. Part throttle really sucks. It really does feel like the pump is going out or the spark is cutting out. So it's proven that the ride feels better at part throttle and more power is still to be made on the stock set-up, then that's where I am headed next. Not to mention that tiny little hole the fuel has to go through on the stock fpr.
So is the rewire reccomended on the walbro set-up?
What about the Perrin fuel rail? Is it no better than factory? Also, could you install a return line kit on a stocker or without tuning? I have been thinking about doing this but, I can't afford it + SAFC at the same time.
Ive got the same question as Bebo, Im stage 1, what all can I do to my fuel system without SAFC to gain horsepower and prepare for the big turbo plans? would Walboro pump, fuel pressure regulator, and return fuel like be hard on my car until I get a bigger turbo or will it actually help?
If I'm wrong, someone with HANDS ON experience jump in here... I'm only an engineer (3 more classes). You DON'T NEED a fuel return kit. The last injector getting "starved" is a result of insufficient fuel pressure and/or fuel rail volume. The reason newer cars have this system is to meet Federal requirements for evaporative emissions. A returnless system will work fine with high horsepower (hence, stg. 3); IF someone can TUNE it and properly match the components (AND avoid unwanted pressure differentials w/i the rail). Many tuners just swap back to the old return system because its easier to set a static fuel pressure with injector PWM (Pulse Width Modulation, to control flow) than to set up a seperate fuel pressure table (pump voltage) for all possibilities of throttle angle, mani. pressure, injector duty cycle, etc. A pro, with the right background, resources and TIME could make a returnless system work with a really high hp car. Of course, at the moment, that would entail ripping out the factory ecu and wiring and swapping in a MoTec or other high end programmable system with lots of functions. Put that in your pipe and smoke it.
but with the time and $$ to tune without is far more than just using a return
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Quote:
Originally Posted by dansrt4
For a shop thats so behind maybe you should catch up on orders before you catch up to me.
ok with out all the technical mombo jombo will i see any difference with my car if i do the fpr mod? if i do it how much more can i turn up the boost? (i do not have a high horsepower car, yet)
Last edited by spinnin3rd : 11-30-2006 at 04:04 PM.
answer the question technically...why do we need it...
you dont!!!! a return line is used for larger pumps allowing the pump to maintain a steady flow of fuel there are benifitsto this
1 cooler fuel
2 less wear on pump
3 volume on hand is increased dramaticaly
3 less mechanical noise
you dont need one unless you are running huge injectors that when open drop fuel pressure so atomization of fuel sufers"lean out",with a return line, the return will shut to match the volume and pressure thats it end of story no majic
the cooler fuel will yeild some power also
ps its not the last injector starving .the laws of physics prevent that the pressure of fluid in a contained enviornment is the same even if its that poor last injector!
becareful what you read in the fourms 98%is bs from kids
I know about that mod (currently viewing the FPR MOD thread) but can it reduce FP? I def don't need to increase it.
dude you need to lessen the amount of fuel the only way is to lessen the duty cycly if you lower your pressure your injectors will lose their ability to atomize fuel that means your car will run like crap all the time THE INJECTORS DONT JUST DELIVER FUEL THE BREAK DOWN THE STREAM INTO A MIST OF TINY DROPLETS
Anyone know what the lowest you can set a return line with stage 2 injectors and still have the fuel atomoiz (s?) correctly at idle? Mine is set for a base of 35right now. (running 23psi boost, 255 pump and w/I lots of fuel)
Right now with a base of 35 it runs smooth as apple pie at idle
(LTFT is only +1.2, that flops around when driving around anywere from -4 to + 18 at low part throttle, so depending on the fuel cell map)
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