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Old 11-19-2001, 02:11 AM   #1
RotarFreak
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Default Need more fuel

hi all.

from what i've been reading the 2000 rs is capable of about 195 HP with stock fuel injectors. With fuel pressure riser i can get up to 240-260.

1) How much can the stock fuel rail handle without modifications?

2) Will Intake + 3 pulley set + torque chip II +headers + full exhaust with 1 freeflow cat + cobb cams put me over the top?
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Old 11-19-2001, 02:13 AM   #2
bsquare
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Better safe than sorry? The stock fuel rails are fairly feeble, and have an unfortunate design flaw which can starve cylinder 4.
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Old 11-19-2001, 02:26 AM   #3
Eric SS
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swap and N20. gone. : (

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It will take a lot more than that to get to 240hp.

Something that I think needs to be addressed is that injectors is not a case in which the "bigger is better" rule applies. To big of an injector can be bad for an engine and cause fowling and poor performance.

Here is a good size calculator and a little info:
http://www.rceng.com/technical.htm

Here is a site that I have bookmarked because of how much info it has on different kinds of fuel injectors:
http://www.autospeed.com/A_0102/P_1/article.html

Eric
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Old 11-19-2001, 02:31 AM   #4
bsquare
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I think he meant over the top of the capacity of the stock fuel system, not over the 240hp top.
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Old 11-19-2001, 05:34 AM   #5
RotarFreak
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Default pretty much

I just wanted to know what's the max fuel capacity of stock fuel system.

i belive stock injectors are 240cc or so..
max hp with stock injectors is 195

since i know i will be over that i'll need a fuel riser. that will get me to 240-260 max hp.

I just want to know what other components will present a bottle neck and when. It would seem that Fuel Rail and fuel pump will be the next bottlenecks.

ps: rx7 secondary injectors are 750cc each
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Old 11-19-2001, 07:24 AM   #6
wac
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Quote:
The stock fuel rails are fairly feeble, and have an unfortunate design flaw which can starve cylinder 4.
Really? Then why does almost every post in the archives say that cylinder 3 is the one that runs lean?

I'm still trying to figure out which one is true...

-WaC
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Old 11-19-2001, 07:57 AM   #7
RotarFreak
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Quote:
....have an unfortunate design flaw which can starve cylinder 4 or 3.
When you say that... are we talking about stock car, or a car with significant upgrades?
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Old 11-19-2001, 08:17 AM   #8
Section 8
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When you creep up on the maximum fueling the system is capable of, since the injectors are run in series, the last injector begines to "run out of fuel". When you begin to have fueling problems, this starts.

Greg
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Old 11-19-2001, 09:58 AM   #9
RotarFreak
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Default ok

i finnaly found it.

how much will this help?
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Old 11-19-2001, 01:43 PM   #10
Midwayman
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If you up the fuel pressure you should be able to support over 200hp. FWIW the stock injectors are 280cc. From what I hear, its a bad idea to run more than 50psi or so on stock injectors. Ask the turbo guys about that.
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Old 11-19-2001, 03:46 PM   #11
Eric SS
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Quote:
Originally posted by wac


Really? Then why does almost every post in the archives say that cylinder 3 is the one that runs lean?

I'm still trying to figure out which one is true...

-WaC
Wayne
Almost all of us Turbo guys that have fried a piston fried #4.

Eric
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Old 11-19-2001, 03:57 PM   #12
Drac9
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That mod would be great if it didn't leave rubber fuel lines laying RIGHT on top of the engine, not to mention the coolant running through that channel right up there could potentially super-heat the fuel. It would be better to run larger steel line across. and run larger injectors. The cheap mod wont be so cheap if it starts an engine fire.
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