big fuel questions, please help - Boost Forum

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big fuel questions, please help
Monday, July 18, 2005 10:51 AM
well I began doing some research on a turbo project and I had a few quaetions that I can't find awnsers to. well here we go.

Fuel Pressure Regulators and fmu
what is a stable setting for running 6 pounds?
do I need both boost dependent fmu and adjustalbe regulator ?
will i need to change fuel pumps?
were would I mount them on 2.4 cavy ?
will I have to chang injactors if so to what size ?
and where can I get cheap ones?
will i have to change fuel rail?



there are probalby be more questions following

Re: big fuel questions, please help
Monday, July 18, 2005 10:58 AM
Fuel Pressure Regulators and fmu
What are you asking?
what is a stable setting for running 6 pounds?
Depends on what turbo you have, 6lbs on a T04E isn't 6lbs on a GT35R
do I need both boost dependent fmu and adjustalbe regulator ?
Yes
will i need to change fuel pumps?
It is recommended that you do, yes
were would I mount them on 2.4 cavy ?
Same place the stock pump is
will I have to chang injactors if so to what size ?
Yes, but depends on what size turbo, and what year car and engine you have.
and where can I get cheap ones?
Depends on above question
will i have to change fuel rail?
No





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Re: big fuel questions, please help
Monday, July 18, 2005 11:02 AM
Well, fisrt the fuel rail isn't necessary, but you might want to tap a guage onto it to read your pressure. Running 6 psi, I would replace the pump just to be safe, along with the injectors. Getting an AFPR( like the accel one that goes inplace of the stock one) and lowering your base pressure is a good idea as well. With the higher flow pump and larger injectors you will need to lower the base pressure so you don't over fuel. Also, knowing how much fun boost is, you will end up turning up the pressure, and will need pretty much everything you listed. FMU's are pretty pointless, since they are such a PITA to tune, unless you fork out the $250 bucks or so for the cartech one. Personally I would install an S-AFC or Greddy E-manage to properly tune the fuel/air mixture, and A nice wideband will work wonders for you.
Hope this helps you out, athough it's kinda hard to understand this crap when you first start with forced induction.








Failure is not failure if you learn from it
Re: big fuel questions, please help
Monday, July 18, 2005 11:12 AM
well first is a tdo4hl-15g turbo I want only six lbs from it then i wish to start up grading to the t3/t4 hybrid to get like 10-12 then from there my new motor should be done with bore stroke and all internals I want to get to 350 to 400 hp with that motorbut for now I just want to get about 210 to 220hp twith this setting
and all of this will go in to my 2.4 l cavalier.
any tips besides be patient
Re: big fuel questions, please help
Monday, July 18, 2005 11:23 AM
Well, after you build the engine to be bulletproof , you are gunna have to upgrade the tranny to handle that much power, that gets very costly since a good set of axles can run you upwards of a grand. Speed and reliability isn't cheap. Also, since you are gunna upgrade later, fuel items are expensive, so is the proper equipment to tune it. You might as well buy the bigger injectors,pump, AFPR,etc now and just install it with a e-manage unit and turn the chit down for know, this will save you the trouble of doing all over again later.








Failure is not failure if you learn from it
Re: big fuel questions, please help
Monday, July 18, 2005 11:42 AM
Don't stroke a motor you are going to add boost to.

Also, pick the turbo you are going to use, the Mitsu turbos have a different flange than the T3 style, so in order to change your turbo later, you'll also have to change your manifold, and probably a portion of your hot side piping. The T3/T4 will give you the 220ish you are looking for, but the Mitsu probably won't.





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Re: big fuel questions, please help
Monday, July 18, 2005 4:06 PM
if its any help i have the rsm charger running between 6 and 7 lbs. of boost and i am running RC 370cc injectors, Accel adjustable fuel regulator, and a 255 lph pump. the motor is running prime with a 11.5:1 air fuel ratio under boost. just some info that may be helpful. good luck....do your home work and take some time with it. you will find out that is the most important thing with forced induction.......READ, and when you think you've read everything, read some more...
Re: big fuel questions, please help
Wednesday, July 20, 2005 12:49 AM
Shifted wrote:Don't stroke a motor you are going to add boost to.
Turbos love load introduced by a longer stroke. I would go with a stroker motor if I was going to redo your bottom end and go with a turbo setup. As long as you keep a mild compression ratio and good a/f ratio, you'll be fine. The big bore won't hurt either as that will help unshrowd the valves -- you could also run over-sized valves then too (would require a port job to take full effect). Just be careful if you port your heads. You still want to maintain high velocities, even with forced induction.

As a reference, a conservative compression ratio for a v8 is 8.5:1. This is a good number for a turbo or a roots/twin screw type supercharger. You can get away with higher compression ratios on a centrifugal though (up to 11:1 with mild boost on pump gas).



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