Power Fc
10-28-2003, 03:03 PM
#1
Junior Member
Thread Starter
Join Date: Sep 2003
Posts: 17
Hi i have a single T04E turbo set up...with stock intercooler and fuel pump and injectors...i was wondering what would be the a safe high boost limit...how much can i increase my boost till with the powerfc installed that my car does not lean out.....i have intakes and free flow exhast also.....your advise is greatly apprciated..
thanks.....
thanks.....
10-28-2003, 06:41 PM
#4
Senior Member
Join Date: Dec 2001
Location: Okinawa Japan at McDonalds
Posts: 472
.8-1.0k with a better fuel pump and some tuning. If you run on the map that comes with the power fc for twins, you will have a slight rich spot at 3500-4000, and a big lean spot from 4000 up. The car will run for a couple of months maybe, but then you will be buying a new motor. I have tuned 3 such setups in the last year, all had aftermarket fuel pumps. By using a stock fuel system and a larger pump, you are effectively getting higher fuel pressure, which makes the injectors flow more fuel than they are rated at.
10-29-2003, 02:05 AM
#6
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Join Date: May 2002
Location: Okinawa, Japan
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Originally Posted by little rotor' date='Oct 29 2003, 04:32 PM
If your using the stock fuel pressure regulator, why would you have higher fuel pressure?
10-29-2003, 03:18 AM
#7
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Join Date: Dec 2001
Location: Okinawa Japan at McDonalds
Posts: 472
Originally Posted by little rotor' date='Oct 29 2003, 04:32 PM
If your using the stock fuel pressure regulator, why would you have higher fuel pressure?
10-29-2003, 05:48 AM
#9
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Join Date: Aug 2002
Posts: 65
Shouldn't the regulator just allow the extra fuel to flow down the return line to keep the desired pressure? i.e its not just a fixed size hole. Obviously at some point you would get to the point where the regulator could physically not pass enough fuel to maitain the desired pressure, but this would be more of an issue at idle when the injectors are not passing much fuel and if the two stage pump speed is not being used.
In regard to JSpecs post, I realise you will have higher fuel pressure at higher boost, my question was relating to the effect of changing the fuel pump only.
In regard to JSpecs post, I realise you will have higher fuel pressure at higher boost, my question was relating to the effect of changing the fuel pump only.
10-29-2003, 07:23 AM
#10
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Join Date: Dec 2001
Location: Okinawa Japan at McDonalds
Posts: 472
Originally Posted by sleeper7' date='Oct 29 2003, 06:54 PM
Is what I think should of been said was, with a bigger fuel pump you increase fuel volume, not pressure. The stock fuel pump runs out of fuel under higher boost. Just my .2 cents
chuck
chuck