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Newbie Forum: Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

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Old 12-16-2009, 03:34 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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15 psi Fuel system question.


I am buying all kinds of parts right now for my 98 gst, im going to be running an evo 3 16g, using a MAFT and GM MAF, i was wanting to run 15 psi, i was told by a buddy of mine that i can use the stock injectors safely at 15 psi, should i upgrade the injectors and fuel pump or will i be safe?


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Old 12-16-2009, 03:40 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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If that is all you want I recommend getting a Walbro 190lph and I would recommend some bigger injectors. Especially since you are getting a MAF-T setup. Go with some 660's since you will have the pump and injectors to support more power if you want it while not needing an adjustable fuel pressure regulator setup. Make sure you have something to log your knock with though. And a wideband is always helpful when tuning.


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Old 12-16-2009, 04:22 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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im wanting my car to have as best ga mileage as i can get, its a dd, if 15 psi is not safe on stock injectors and pump ### is the highest safe boost?

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Old 12-16-2009, 04:27 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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Your gas mileage won't be affected if you tune it correctly, or it won't be affected to a significant degree, you can have 1000 CC injectors in and a 255 Wally and still get 25+ mpg, its all about boosting, if you don't boost you don't use as much gas, simple as that. Your injectors and pump will only push so much with the demand, if you get what I'm saying, if your boosting your demanding more fuel, which therefore makes the injectors push more fuel. Get it?

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Old 12-16-2009, 05:01 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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Quote:
Originally Posted by Nati0nalxCrisis View Post
Your gas mileage won't be affected if you tune it correctly, or it won't be affected to a significant degree, you can have 1000 CC injectors in and a 255 Wally and still get 25+ mpg, its all about boosting, if you don't boost you don't use as much gas, simple as that. Your injectors and pump will only push so much with the demand, if you get what I'm saying, if your boosting your demanding more fuel, which therefore makes the injectors push more fuel. Get it?
yea i know that much but if i have the power im gonna use it lol i was just wondering if i can use the stock stuff safely on 15 psi

anyone know?

please someone help! lol

Quote:
Originally Posted by Nati0nalxCrisis View Post
Your gas mileage won't be affected if you tune it correctly, or it won't be affected to a significant degree, you can have 1000 CC injectors in and a 255 Wally and still get 25+ mpg, its all about boosting, if you don't boost you don't use as much gas, simple as that. Your injectors and pump will only push so much with the demand, if you get what I'm saying, if your boosting your demanding more fuel, which therefore makes the injectors push more fuel. Get it?
yea just tryinto find out if the stock FP and injectors will hold 15 psi

Last edited by gstbobby; 12-16-2009 at 11:05 PM. Reason: Auto-merged with previous post to prevent "bumping"

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