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1984 GPz1100-A2 DFI FPR?
- droptail
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18 Jun 2009 20:19 - 18 Jun 2009 20:21 #300481
by droptail
'84 GPz1100A2
'83 GS1100ES
'79 CBX1000
1984 GPz1100-A2 DFI FPR? was created by droptail
Before buying an adjustable FPR, I better understand how they work first, and what the role is of the vacuum signal.
Does the fuel pressure delivered to the injectors increase with load?
Need I get a replacement FPR that uses a vacuum signal?
Thanks,
Does the fuel pressure delivered to the injectors increase with load?
Need I get a replacement FPR that uses a vacuum signal?
Thanks,
'84 GPz1100A2
'83 GS1100ES
'79 CBX1000
Last edit: 18 Jun 2009 20:21 by droptail.
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- Dave Sloan
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19 Jun 2009 15:39 - 19 Jun 2009 15:47 #300700
by Dave Sloan
Z650B2 - Injected
Replied by Dave Sloan on topic 1984 GPz1100-A2 DFI FPR?
fuel pressure regulator has a vac line so that hte fuel pressure to the injectors is always constant. So when the pressure in your intake runners changes due to the throttle opening and closing the fuel pressure varies the same amount so that the injectors supply a constant amount and any changes are done by the ecu. So yes you definatly need a vac referenced FPR
Copied this from the msefi.com site
The vacuum referenced fuel pressure regulator is essential. It provides constant pressure differential between fuel at injector nozzle and manifold air pressure [port EFI] or atmospheric pressure [TBI]. This makes the injected fuel quantity solely a function of the injector open time.
If you were to 'cap off' the manifold vacuum port on the fuel pressure regulator, you are reducing the dynamic range of the injectors. This means you will need lower pulse widths at at (giving less control over idle mixtures) and lower flow under boost (restricting the maximum horsepower).
So, in general, for port injectors, have the fuel pressure regulator connected to the manifold vacuum is a good thing. There is very little reason not to do it (though some have argued against it for individual runner port EFI set-ups).
If you have an adjustable fuel pressure regulator (FPR), set the pressure with the fuel pump running, but the engine not running - that's your base fuel pressure (it is referenced to atmospheric pressure).
Copied this from the msefi.com site
The vacuum referenced fuel pressure regulator is essential. It provides constant pressure differential between fuel at injector nozzle and manifold air pressure [port EFI] or atmospheric pressure [TBI]. This makes the injected fuel quantity solely a function of the injector open time.
If you were to 'cap off' the manifold vacuum port on the fuel pressure regulator, you are reducing the dynamic range of the injectors. This means you will need lower pulse widths at at (giving less control over idle mixtures) and lower flow under boost (restricting the maximum horsepower).
So, in general, for port injectors, have the fuel pressure regulator connected to the manifold vacuum is a good thing. There is very little reason not to do it (though some have argued against it for individual runner port EFI set-ups).
If you have an adjustable fuel pressure regulator (FPR), set the pressure with the fuel pump running, but the engine not running - that's your base fuel pressure (it is referenced to atmospheric pressure).
Z650B2 - Injected
Last edit: 19 Jun 2009 15:47 by Dave Sloan.
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- larrycavan
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19 Jun 2009 17:44 #300759
by larrycavan
Replied by larrycavan on topic 1984 GPz1100-A2 DFI FPR?
405-677-6397, ask to speak with Sid. He'll hook you up with a good adjustable regulator.
I spoke to him 2 days ago. He'll still do the Throttle Body bore as well.
I spoke to him 2 days ago. He'll still do the Throttle Body bore as well.
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- otakar
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19 Jun 2009 18:49 #300775
by otakar
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Replied by otakar on topic 1984 GPz1100-A2 DFI FPR?
This is the one I bought.
cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll...ported#ht_500wt_1214
cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll...ported#ht_500wt_1214
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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