Adjustable Fuel Pressure Regulator
Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
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From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Adjustable Fuel Pressure Regulator
Has anyone used this Adjustable Fuel Pressure Regulator on your 97/98?
How do you adjust it?
http://www.madvet.com/shop?store=2&category=13&frame=19
:cheers:
How do you adjust it?
http://www.madvet.com/shop?store=2&category=13&frame=19
:cheers:
Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
Likes: 3
From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Re: Adjustable Fuel Pressure Regulator (Red C5)
Why is it only for 97-98?
I have read it from the Corvette Magazine but could not find that info.
I only find this link from them ...
http://www.corvettemagazine.com/2003.../np1-1-3rd.asp
Pro
Joined: Oct 2000
Posts: 545
Likes: 1
From: Charlotte NC
Re: Adjustable Fuel Pressure Regulator (Red C5)
97 and 98 had a different fuel system. This configuration had 2 fuel lines to the fuel rail, one a delivery and one was a return line. It allowed for the pressure to be regulated at the fuel rail, ie., regulator. It is adjusted by an adjustment screw on the housing. You would need to attach a fuel pressure gauge to get a correct adjustment.
Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
Likes: 3
From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Re: Adjustable Fuel Pressure Regulator (CapeCodCoupe)
Does anyone have instructions on installation and configuration? I bought one a year ago and never installed it.
I thought it is adjust fuel pressure automatically
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Re: Adjustable Fuel Pressure Regulator (mike76002)
I have the instructions somewhere and I will go look for them. If you add this to your car you will need some way to monitor all of the functions that it effects. You need to know where your LTFT and STFT are already. If your car if running real rich or lean the regulator adjustment will be able to help. If you already have good fuel trims and crank in more or less fuel pressure you could hurt your performance. That is why I never installed mine. I am going to wait until I purchase LS1 edit.
BC
Bill C
BC
Bill C
Melting Slicks
Joined: Mar 1999
Posts: 2,499
Likes: 0
Re: Adjustable Fuel Pressure Regulator (mike76002)
I have an AFPR on my '98. Mine has a bolt that you turn to adjust the pressure. You need the fuel pressure guage to know what the pressure is set to. Set it with the BARO line disconnected.
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Racer
Joined: Mar 2002
Posts: 397
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From: Marstons Mills MA
Re: Adjustable Fuel Pressure Regulator (MMarquez)
Yes it does come with instructions but they are vague to say the least. The bottom line in the instructions says: "Tip: Set to 54-55 psi." Can anyone agree this is the right pressure for my set up?
Thread Starter
Former Vendor
Joined: Feb 2002
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From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Re: Adjustable Fuel Pressure Regulator (Bill Curlee)
I have the instructions somewhere and I will go look for them. If you add this to your car you will need some way to monitor all of the functions that it effects. You need to know where your LTFT and STFT are already. If your car if running real rich or lean the regulator adjustment will be able to help. If you already have good fuel trims and crank in more or less fuel pressure you could hurt your performance. That is why I never installed mine. I am going to wait until I purchase LS1 edit.
BC
Bill C
BC
Bill C
Thanks
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Re: Adjustable Fuel Pressure Regulator (mike76002)
Well,,,, that may not be totally true. If your Fuel Pressure is high or low the adjustable regulator can fix it, The regulator is just another method of changing the way you engine runs. Use the LS1 edit to see what your engine is doing and what it needs to do it better!!! :thumbs:
Bill C
Bill C
Pro
Joined: Apr 2002
Posts: 726
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From: Denver CO
Re: Adjustable Fuel Pressure Regulator (mike76002)
This is what I found out; choose the path you like, just suggestions. The 97/98s, as I've learned, run rich, period. Especially at WOT. You can lean them out some with intake (Blackwing) and cat-backs. Perfect fuel ratio is @ 14.7:1 (stoichiometric ratio). Max. power is achieved at @ 13:1. You can get an AFPR for @ $120 plus an MAFT (@$100+) for a temporary fix (the PCM learns out the MAFT except for the WOT fuel tables), or get a mail-order LS1 Edit (@$250), or purchase AutoTap and LS1 Edit to make the changes yourself.
If you choose the AFPR, I've heard that 51 psig is the setting to shoot for. However, lowering your fuel pressure will impact the injector spray pattern, i.e. less efficient air/fuel mixture in the combustion chamber. For now, I've chosen the mail order route since I can have the PCM updated free (plus shipping) for the next 60 days, and $50 thereafter. I WILL purchase LS1 Edit in the future to fine tune myself, but as a quick fix to the run-rich problem (plus adjusting the fan 'turn-on' temps, tranny shift points, etc, etc, etc) I felt that having the mail-order tune was the best route.....and I'm very happy with my decision :D :D :D :D :D
If you choose the AFPR, I've heard that 51 psig is the setting to shoot for. However, lowering your fuel pressure will impact the injector spray pattern, i.e. less efficient air/fuel mixture in the combustion chamber. For now, I've chosen the mail order route since I can have the PCM updated free (plus shipping) for the next 60 days, and $50 thereafter. I WILL purchase LS1 Edit in the future to fine tune myself, but as a quick fix to the run-rich problem (plus adjusting the fan 'turn-on' temps, tranny shift points, etc, etc, etc) I felt that having the mail-order tune was the best route.....and I'm very happy with my decision :D :D :D :D :D
Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
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From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Re: Adjustable Fuel Pressure Regulator (TopCat)
Well, I got LS1 edited by LG and re-tune will cost 150$ if I put in on a dyno.
I am about to have it re-tuned so I think they will adjust fuel pressor.
I know my car is running rich now because at idle, I can smell all the gasoline even with cats.
Anh why with cat-backs can lean out a bit?
Thanks
I am about to have it re-tuned so I think they will adjust fuel pressor.
I know my car is running rich now because at idle, I can smell all the gasoline even with cats.
Anh why with cat-backs can lean out a bit?
Thanks
