how much extra power
09-15-10, 01:41 AM
#27
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Yes however there are different types of RRFPR.
Thanks for posting...........Mine is from this company http://www.bellengineering.net/produ...&products_id=1 but is the same as the link you included.
here's info on a "real" rising rate fuel pressure regulator, courtesy of a wise old sage by the name of Google.com http://www.cartech.net/fmu2020instruc.htm
09-15-10, 01:46 AM
#28
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Don't let the terminology confuse you. A traditional FPR, like the factory one and your typical Aeromotive one, maintain the same pressure differential between the fuel and the manifold. So at 0psi boost you may have fuel pressure of 36psi. At 10psi boost you will have fuel pressure of 46psi. The fuel pressure increases at the same rate as the manifold pressure. This can be called a 1:1 FPR, although people sometimes mistakenly refer to it as "rising rate."
On a "real" rising rate fuel pressure regulator, the oldschool kind, the fuel pressure increases faster than the manifold pressure. So at 0psi you may have 36psi fuel pressure. At 10psi boost, instead of having 46psi fuel pressure you might have 50psi. I refer to this as an "oldschool" mod because back in the day when engine management was more limited people had to do it this way rather than having a computer to calibrate.
The fuel cut varies with rpm. Here is the graph for the series 6:
The ceiling could be higher on the later models. Do the '99+ models run higher boost from the factory?
On a "real" rising rate fuel pressure regulator, the oldschool kind, the fuel pressure increases faster than the manifold pressure. So at 0psi you may have 36psi fuel pressure. At 10psi boost, instead of having 46psi fuel pressure you might have 50psi. I refer to this as an "oldschool" mod because back in the day when engine management was more limited people had to do it this way rather than having a computer to calibrate.
The fuel cut varies with rpm. Here is the graph for the series 6:
The ceiling could be higher on the later models. Do the '99+ models run higher boost from the factory?
09-15-10, 01:55 AM
#29
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The hose attached to the wastegate is now going to a restricted orfice. Boost can be increased or decreased by placing a larger or samller orfice in the line. Not sure that is the answer to your question. I think that's how the stock ECU is 'fooled'.
09-15-10, 02:15 AM
#30
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not what he meant, the stock ecu will cut fuel if it sees boost past a certain point, he was wondering how you get around this, you're talking about using different restrictor(er?) pills in the wastegate line.
09-15-10, 04:44 PM
#33
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I talked to Carlos years ago (like more than 10) and he explained something about the fuel cuts having been altered. However, for the life of me, I don't remember what he said. I would love to get in contact with him again and ask. I have his # from 10 years ago. I've called it twice and it rings then goes to VM. The VM has the standard pre-recorded message (not someone's actual voice) so I don't know if it's his current # or not. Anyone know his current # please PM it to me.
09-15-10, 04:49 PM
#34
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Correct. The only aftermarket gauge I have is a boost gauge mounted on the A-pillar. I need to get a whole **** load of aftermarket gauges now that my car is back on the road!
09-15-10, 05:28 PM
#35
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CLR
(305) 235-3696
you don't need a bunch of gauges, search around, threads about gauges pop up every so often, general consensus is boost and wideband are mandatory.
the factory 93-95 ecu should perform as described, it will cut fuel if boost goes past a certain point, the OP has a JDM/AUDM 2000 model that seems to not have this feature. Not sure if it's the stock ecu or aftermarket and if it's stock, how he got around this limitation.
(305) 235-3696
you don't need a bunch of gauges, search around, threads about gauges pop up every so often, general consensus is boost and wideband are mandatory.
the factory 93-95 ecu should perform as described, it will cut fuel if boost goes past a certain point, the OP has a JDM/AUDM 2000 model that seems to not have this feature. Not sure if it's the stock ecu or aftermarket and if it's stock, how he got around this limitation.
09-15-10, 09:48 PM
#36
ahh.. the op said he has a PowerFC ... not sure about fuel cut capability with those.
still 15 psi on stock motor, ic and fuel system with an open intake and exhaust .. WOW! that is even beyond my level of bravery!!! pfc or not.
to the op, why dont you have an AFR guage? or do you? what kinda readings do you get at 15psi ?
still 15 psi on stock motor, ic and fuel system with an open intake and exhaust .. WOW! that is even beyond my level of bravery!!! pfc or not.
to the op, why dont you have an AFR guage? or do you? what kinda readings do you get at 15psi ?
09-15-10, 11:16 PM
#37
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whoops, thought it was the OP we were discussing hitting fuel cut, the PFC can have the limit raised.
94rx7tt, still don't know how you're avoiding fuel cut.
94rx7tt, still don't know how you're avoiding fuel cut.
09-16-10, 12:55 AM
#38
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as i said the factory boost gauge fitted to my car when it was in stock condition would read 10 x10kpa which equates to 14.5 psi absolutely stock standard.no i dont have an afr gauge but the car sounds and runs like magic day in day out on some occasions to 9000 rpm,does blow a large cloud of blue smoke after revving to 9000rpm and letting off but only at 9000 that's what the rev limiter is set to on pfc.i could rev it to 8500 all day with no smoke ,is this the rev limiter causing this smoke to occur
09-16-10, 08:37 AM
#40
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[QUOTE=MrNizzles;10218740]still 15 psi on stock motor, ic and fuel system with an open intake and exhaust .. WOW! that is even beyond my level of bravery!!! pfc or not.QUOTE]
I am the bravest man on earth, lol. But seriously, it's funny, when I first got my FD (14 years ago) I didn't know what I didn't know. So, I talked to CLR and he explained what he did to the car to protect it against running lean and it made sense to me. I pushed my car to the limit time after time on the track, without the worry that I might run lean. Now, that's not to say I was running blind. I did use the appropriate ratio of two stroke to fuel, I ran 93 octane (East Coast at the time), octane boost or race fuel if available and the aftermarket RRFPR. I also made sure the car ran as cool as possible using water wetter, under drive pulleys, a fluidyne radiator, proper cool down time back in the pits at idle with hood raised.
That makes two of us, man. I'll see if I can get ahold of CLR again and ask.
I am the bravest man on earth, lol. But seriously, it's funny, when I first got my FD (14 years ago) I didn't know what I didn't know. So, I talked to CLR and he explained what he did to the car to protect it against running lean and it made sense to me. I pushed my car to the limit time after time on the track, without the worry that I might run lean. Now, that's not to say I was running blind. I did use the appropriate ratio of two stroke to fuel, I ran 93 octane (East Coast at the time), octane boost or race fuel if available and the aftermarket RRFPR. I also made sure the car ran as cool as possible using water wetter, under drive pulleys, a fluidyne radiator, proper cool down time back in the pits at idle with hood raised.
That makes two of us, man. I'll see if I can get ahold of CLR again and ask.
