01-13-2024, 08:34 AM | #1 |
Drives: 98 Camaro Join Date: Apr 2022
Location: MD
Posts: 274
|
New injectors coming
|
01-13-2024, 08:56 AM | #2 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 5,125
|
Quote:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
|
|
01-13-2024, 09:39 AM | #3 |
Drives: 98 Camaro Join Date: Apr 2022
Location: MD
Posts: 274
|
|
01-13-2024, 10:08 AM | #4 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,953
|
The XDI +65's are stable to 26-2700psi max.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
01-13-2024, 12:07 PM | #5 |
Drives: 98 Camaro Join Date: Apr 2022
Location: MD
Posts: 274
|
|
01-13-2024, 03:41 PM | #6 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,953
|
yes, I ran mine at 2900 psi when I had LT4 injectors.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
01-13-2024, 05:21 PM | #7 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 5,125
|
Keep in mind that asking the HPFP for more PRESSURE results in a lower VOLUME through the pump. While the injectors obviously move more fuel volume at higher pressures (as long as they don’t misfire), the HPFP volume it can move decreases. So it’s a balancing act between your injector size, HPFP of choice, cam lobe, etc. King’s point is a great example, his new injectors are bigger than the LT4 ones so he was able to lower the pressure requested from the HPFP.
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
|
01-13-2024, 05:51 PM | #8 | |
Snackbar Tuning
Drives: 2023 SGM ZL1 Join Date: Oct 2016
Location: Florida
Posts: 1,288
|
Quote:
|
|
01-13-2024, 06:47 PM | #9 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 5,125
|
Quote:
If you have smaller injectors (LT4, +30, etc) then yes, you can run higher pressures because you simply aren’t moving as much fuel and can not make as much horsepower as someone with bigger injectors and less pressure. Which is why the XDI +65s kick the stuffing out of the +30s even though their max operating pressure is less…they move more volume. Just for fun, here’s a typical 285 pump. Look at the big drop in volume produced as you ask for more pressure:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
|
|
01-14-2024, 10:19 AM | #10 | |
Snackbar Tuning
Drives: 2023 SGM ZL1 Join Date: Oct 2016
Location: Florida
Posts: 1,288
|
Quote:
Now if you add a larger cam lobe, the pump is flowing more due to volume displacement of the piston travel length x bore diameter. So that "fall off" still occurs at a higher amount because this changes the flow volume vs pressure graph. I hope this makes sense. I'm not arguing your point at all but your graph seems to be showing an electrical pump with a set housing/displacement value. The high side pump fuel pump has variable displacement (simple way of saying it). So yes you are correct. But yes I am correct. There will be a point where flow volume falls off enough to flow less than X injector can flow. Last edited by Megahurtz; 01-14-2024 at 10:30 AM. |
|
01-14-2024, 10:30 AM | #11 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 5,125
|
Quote:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
|
|
01-17-2024, 12:02 PM | #12 | |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,278
|
Quote:
The HPFP are positive displacement piston pumps with a variable opening time. The change in pressure effects the volume of fuel that can pass through the injector in the opening time. Ted. Ted.
__________________
www.jannettyracing.com
Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com |
|
01-17-2024, 06:38 PM | #13 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 5,125
|
Doesn’t matter since even positive displacement and/or variable pumps are still limited by the ultimate physical limitations of the pump itself. If you max it out, attempts at more pressure will be met with a reduction in volume THROUGH THE PUMP. The higher outlet pressure can band-aid injectors that are too small, but ultimately the HPFP will not keep up. If you’re not maxing out the pump then sure, crank it up like Megahurtz stated.
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
|
01-18-2024, 06:30 AM | #14 | |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,278
|
Quote:
You presented a chart for electric pump which is accurate, stating that higher pressure means less volume. True for electric pumps. Reason for that is more about the resistance to pump motor RPM falling as pressure is requested. Which is why Amp draw goes up with requested pressure. However with a positive displacement piston pump that is not the case, UNTIL you try to exceed the displacement. In order to have higher pressure you must have higher volume with a PD pump. The PD pump pressure is controlled via the volume allowed in to the piston chamber. Volume = pressure. So in summary your chart is not relevant when speaking about PD pumps. Open for discussion. Ted.
__________________
www.jannettyracing.com
Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com |
|
|
|
Post Reply
|
Thread Tools | |
|
|