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Old 06-01-2009, 10:58 AM   #1
SL1_sleeper670
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Default low boost/stock fuel system? help?!?

my question is: if i do a custom turbo, w/ Apexi SAFC unit, and such..keeping budget low since this is a lil DD w/ bout 4-8psi boost.
*if i upgrade my stock fuel injectors to 350-380cc fuel injectors, will this work good enough? or am i gonna need the RRFPR (Rising Rate Fuel Pressure Regulator)??

thanks for the help!
ive looked around, and i had a setup i was gonna run, but now some stuff came up n im trying to keep cost down, but still run my boost so i get a better understanding for my fully built setup over winter.

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Old 06-01-2009, 12:45 PM   #2
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Default Re: low boost/stock fuel system? help?!?

Keep in mind that with a piggyback tuning solution like the apexi, you can't tune for partial throttle. While it will let you, the PCM will adjust itself around the apexi's trickery right back to stock settings. The general consensus seems to be that tuning a turbo setup with a piggyback is a bad idea. An extra injector controller or standalone is more the way to go.

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Old 06-02-2009, 11:00 AM   #3
SL1_sleeper670
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Default Re: low boost/stock fuel system? help?!?

i thought about going witht he megasquirt -1 or 2 system, with about 32-35lb injectors, or the same injectors with the SDS system......that stuffs EXPENSIVE tho.
i saw qwksltwo.coms how to turbo a saturn
he said larger injectors with the AFC unit would work pretty well..

how bout 32-35 injectors and a 1:1 RRFPR?

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Old 06-02-2009, 11:14 AM   #4
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Default Re: low boost/stock fuel system? help?!?

I haven't gotten into tuning yet, I should be getting an MS2 in the semi near future though. My biggest advice would be to go to the tuning forum on sixthsphere & read a LOT. Also, if you can solder, you can get a MS for not much more than a piggyback, you just have to assemble it yourself.

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Old 06-02-2009, 11:30 AM   #5
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Default Re: low boost/stock fuel system? help?!?

+1...

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Old 06-02-2009, 12:07 PM   #6
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Default Re: low boost/stock fuel system? help?!?

Quote:
Originally Posted by OnDaGround View Post
+1...
i thought our stock fuel system could support up to 12psi of boost???? but after that u may need a nice fuel pump like walbro hp 255lph and some nice injectors and a wideband o2 sensor would help

also a good system to me is megasquirt

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Old 06-02-2009, 01:20 PM   #7
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Default Re: low boost/stock fuel system? help?!?

Quote:
Originally Posted by Nelsonspride View Post
i thought our stock fuel system could support up to 12psi of boost???? but after that u may need a nice fuel pump like walbro hp 255lph and some nice injectors and a wideband o2 sensor would help

also a good system to me is megasquirt
psi means little in some of these things. Injectors have to be up-sized fairly quickly, but the rest of the fuel system can handle quite a bit before being upgraded, aside from needing a tuning solution.

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Old 06-02-2009, 03:20 PM   #8
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Default Re: low boost/stock fuel system? help?!?

First off to do any tuning you are going to want a Wideband, otherwise say bye bye to valves and possibly your motor. Secondly, psi is relative, its more horsepower. 10psi on one system will make a horsepower number, and 10psi on a different will make a different horsepower number. Thats why you set your goals to horsepower and not psi.

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Old 06-02-2009, 03:48 PM   #9
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Default Re: low boost/stock fuel system? help?!?

+1 for "you will need a wideband oxygen sensor", and you may find some other sensors helpful as well. You can't tune if you don't know how rich or lean you are.

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Old 06-02-2009, 03:50 PM   #10
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Default Re: low boost/stock fuel system? help?!?

Running any boost you should have a Wb02. Also a boost gauge would be good, oil temp I would say, water temp don't need (duh its on your dash).

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Old 06-04-2009, 12:19 AM   #11
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Default Re: low boost/stock fuel system? help?!?

You're on the right track. Head over to sixthsphere and you will get your questions answered. Sounds like you've done a good deal of research, and that is always appreciated there.

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Old 06-06-2009, 05:09 PM   #12
SL1_sleeper670
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Default Re: low boost/stock fuel system? help?!?

haha yeah i tink ive read more in forums in the past 6 months then i have ever read in my life. LOL.

thanks for the advice/help. ill keep researching, and such. im only half saved up for the build atm anyways.

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Old 06-07-2009, 12:26 PM   #13
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Default Re: low boost/stock fuel system? help?!?

sorrry ima noob but i know alot about saturns but not all, always looking for more info i have a 1995 sc2, and im wanting to turbo it ive had people tell me piggyback sytems, added injector ( standalone system ran off map sensor ) water injection, and to run it without anything im only wanting to run around 6-7 psi, just to gain a little more power, would the dtock rods, pistons, block and head stand up to it?

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Old 06-07-2009, 12:51 PM   #14
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Default Re: low boost/stock fuel system? help?!?

If I'm not mistaken stock rods will bend at like 250hp.

As for your goal, don't go for PSI, go for HP. Different setups make different horsepower at the same PSI.

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