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Old 02-18-2010, 02:17 PM   #1
camarron
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Fuel Pressure

Hey does anybody know how much fuel pressure to run for desired boost settings such as 15 psi is there a set fuel pressure that you need to have in order to run such numbers?

Just something Ive been wondering.

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Old 02-18-2010, 02:21 PM   #2
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Re: Fuel Pressure

You can run all different base fuel pressures depending on the setup. We need more info on your car.
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Old 02-18-2010, 02:24 PM   #3
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Re: Fuel Pressure

Oh Im sorry completely stock 420a afpr hahn racecraft kit, big intercooler and aftermarket fuel pump my fuel pressure is set on 40 right now.
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Old 02-18-2010, 02:29 PM   #4
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Re: Fuel Pressure

Injector size?
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Old 02-18-2010, 02:31 PM   #5
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Re: Fuel Pressure

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Injector size?
Stock, so its like what 450 cc?
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Old 02-18-2010, 02:52 PM   #6
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Re: Fuel Pressure

Stock injectors on a 420a? Try less than half of that.

Stock specs of a 420a fuel system...

190cc injectors 235 cc/min @ 43.5 psi fuel pressure. Assuming your 420a block is stock too, I would not push that motor to 15psi, tuned or not tuned it is not a good idea.
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Old 02-18-2010, 03:05 PM   #7
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Re: Fuel Pressure

I did some more searching for you because I needed to know. The Hahn kits for 420a motors look like they upgraded the injector size to 270cc injectors.

Just so you know, nobody on this site really tunes 420a's. Most people on this forum will tell you to keep a 420a car a pretty DD, and get yourself a stock turbo 1g or 2g if you are looking to go for big upgrades. Cost/benefit ratio for 420's just isn't the same as a 4g63t, and I'm sure someone is going to bitch and moan about that, but what are you gonna do.
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Old 02-18-2010, 03:07 PM   #8
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Re: Fuel Pressure

I recently figured this out do to the amount of cylinder wall damage I had but I didnt build this car somone else did. But what be a safe yet faster boost setting to run including the fuel press.

Thanks for the input.
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Old 02-18-2010, 03:10 PM   #9
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Re: Fuel Pressure

Well i blew the motor in it recently like I said I didnt build it. I found out that it was a 420a this way but the previous owners got a 13 second quarter mile out of the car and I know you cant do that on 5 psi boost.

The car is my DD that I pushed to far.
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Old 02-18-2010, 03:12 PM   #10
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Re: Fuel Pressure

Honestly, that motor should never be boosted IMO. Friend tried boosting one and it exploded at like 7psi.
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Old 02-18-2010, 03:12 PM   #11
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Re: Fuel Pressure

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Originally Posted by camarron View Post
I recently figured this out do to the amount of cylinder wall damage I had but I didnt build this car somone else did. But what be a safe yet faster boost setting to run including the fuel press.

Thanks for the input.
No problem man, if you really want to make that 420a fast, I won't discourage you. Might I suggest keep your car running for now, tune down the boost, and find a used 420a engine in somewhat decent shape. Rods, Pistons, Rings, Head studs, you might be able to build yourself a motor that can handle the 15psi for between $1,500 and $2,000k, depending on how you budget and if you're willing to put in some of the work yourself.

Then again, for that price, if you wait long enough, you might be able to find someone letting go of their GST or GSX for that price. Just saying that's how I would look at it.
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Old 02-18-2010, 03:17 PM   #12
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Re: Fuel Pressure

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Originally Posted by gdmbat85 View Post
Honestly, that motor should never be boosted IMO. Friend tried boosting one and it exploded at like 7psi.
Lol well I had it at 15 psi for a while it ran 5 its whole life but I have all the drag racing slips so its legit. Ill run it at a safe 5 psi this time
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Old 02-18-2010, 03:20 PM   #13
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Re: Fuel Pressure

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Originally Posted by aferraro21 View Post
No problem man, if you really want to make that 420a fast, I won't discourage you. Might I suggest keep your car running for now, tune down the boost, and find a used 420a engine in somewhat decent shape. Rods, Pistons, Rings, Head studs, you might be able to build yourself a motor that can handle the 15psi for between $1,500 and $2,000k, depending on how you budget and if you're willing to put in some of the work yourself.

Then again, for that price, if you wait long enough, you might be able to find someone letting go of their GST or GSX for that price. Just saying that's how I would look at it.
Well your a little late bro lol. I already got the motor tor apart and am gettin it bored out because of all the cylinder wall damage I gave it. I have a nice setup on it but the vin reads GS model. Im underfunded so im going with different pistons and ill baby it I guess.
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