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Originally Posted by sixshooter
(Post 1138418)
The second most common fuel problem was a big enough pump but stock wiring and relay that isn't able to keep up with the electrical demand when the pump gets worked to the max. Many aftermarket fuel pumps are serious amperage hogs. The wiring, grounding, and the relay often needs to be upgraded to a higher amperage capable unit.
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Originally Posted by Savington
(Post 1138335)
1300ccs should be more than enough injector, but the problem is that you shouldn't be maxing the 1000s you have with your fuel setup. Adding 1300s or 2000s now would be a bandaid on internal injuries. Others have done exactly what you are trying to do (450whp on E85 with ID1000s, 60psi base + atmosphere reference), so there's no reason you shouldn't be able to do it too. Do you have fuel pressure data at high RPM? Any idea how much power the car is making at 19psi when you're running out of injector?
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Originally Posted by 92mazdaspeed
(Post 1138426)
If larger injectors are going to be a bandaid. I am asking with open arms. What would you suggest I look at. Ive checked that my line from the manifold is seeing vacuum and getting to the FPR. The FPR gauge is reading 62psi at idle. The fuel pump Amps are right in line acceptable. AFR are reading correctly and running at 11 at 17-19 PSI, DC is reading 100%. at 20-22 psi the AFR are climbing to 11.5-12 again DC 100%. I can only assume this is from lack of fuel as the AFR map is requesting more in LTFT. Added 10% Fuel above 17psi to base map. LTFT's are still requesting more. Im going to double check all of the above again tonight. Power I have no idea as it has not been dyno'd yet. was waiting to get everything kind of set before taking and making sure I didnt have any Issues. Which I do now.
Are you running stock fuel pump wiring? You should NOT, i repeat, should NOT be seeing 62psi at idle if you followed FM's directions. |
Originally Posted by 92mazdaspeed
(Post 1138426)
If larger injectors are going to be a bandaid. I am asking with open arms. What would you suggest I look at. Ive checked that my line from the manifold is seeing vacuum and getting to the FPR. The FPR gauge is reading 62psi at idle. The fuel pump Amps are right in line acceptable. AFR are reading correctly and running at 11 at 17-19 PSI, DC is reading 100%. at 20-22 psi the AFR are climbing to 11.5-12 again DC 100%. I can only assume this is from lack of fuel as the AFR map is requesting more in LTFT. Added 10% Fuel above 17psi to base map. LTFT's are still requesting more. Im going to double check all of the above again tonight. Power I have no idea as it has not been dyno'd yet. was waiting to get everything kind of set before taking and making sure I didnt have any Issues. Which I do now.
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^
This. My guess is that you're trying to run a DW300 on stock circuit at higher-than-necessary/higher-than-FM-specified fuel pressures. Or you know... pretty much exactly what i alluded two within my very first two posts in this thread. 1) That you aren't making enough power to max this shit out and 2) your pump isn't keeping up. |
Originally Posted by Savington
(Post 1138357)
erm :party:
....fuck... |
Originally Posted by soviet
(Post 1138396)
You're still on DW300 pump? Or something else? |
Ok since no-one has asked this already: what kind of air/fuel ratio are you running under boost? I bet you are so rich that you are running out of duty cycle! Lean that bitch out!
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Originally Posted by bcrx7
(Post 1138451)
Ok since no-one has asked this already: what kind of air/fuel ratio are you running under boost? I bet you are so rich that you are running out of duty cycle! Lean that bitch out!
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Originally Posted by 92mazdaspeed
(Post 1138426)
If larger injectors are going to be a bandaid. I am asking with open arms. What would you suggest I look at. Ive checked that my line from the manifold is seeing vacuum and getting to the FPR. The FPR gauge is reading 62psi at idle. The fuel pump Amps are right in line acceptable. AFR are reading correctly and running at 11 at 17-19 PSI, DC is reading 100%. at 20-22 psi the AFR are climbing to 11.5-12 again DC 100%. I can only assume this is from lack of fuel as the AFR map is requesting more in LTFT. Added 10% Fuel above 17psi to base map. LTFT's are still requesting more. Im going to double check all of the above again tonight. Power I have no idea as it has not been dyno'd yet. was waiting to get everything kind of set before taking and making sure I didnt have any Issues. Which I do now.
1st. I was wrong. In my testing a mixed up my FPR numbers. Base pressure is 60psi with diagnostic pins crossed. Idle is 50psi. 18psi or so its around 80psi. these are all off the built in gauge on the AEM FPR. 2nd Fuel trims are again the same at 17-22psi hovering around 11-12. I can lean these out later. Its running a base tune till I have everything checked out before taking it for tuning on a Dyno. 3rd. Still maxing out injectors around 19psi at 100% DC 4th. Fuel pump when loaded is pulling a acceptable 12.2amps at adle and 14.3amps under high load boost at around the 80psi. Again thank you for all the help given. |
Do you know how hydra calculates duty cycle?
Injectors actually flow 1180cc @ 60psi 14.4a for 80psi sounds about right and the pump flows 275lph at that pressure - just barely enough to max out 1000cc injectors. |
Nvm, Soviet got it.
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heeeey loooook
Hydra is a piece of shit the sky is blue https://www.flyinmiata.com/support/i...ECU_Tuning.pdf Also take note that the Hydra reads a conservative injector duty cycle- 100% in the Hydra is really around 80-85% in actuality. Therefore, you can tune your fuel out to 100% in the Hydra real-time screen and datalogs. |
Originally Posted by soviet
(Post 1138571)
heeeey loooook
Hydra is a piece of shit the sky is blue https://www.flyinmiata.com/support/i...ECU_Tuning.pdf |
Also take note that the Hydra reads a conservative injector duty cycle- 100% in the Hydra is really around 80-85% in actuality. Therefore, you can tune your fuel out to 100% in the Hydra real-time screen and datalogs. |
I love how it's "around 80-85%", like the actual number is a closely guarded trade secret.
Because Hydra. |
Originally Posted by Savington
(Post 1138589)
:facepalm:
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I recommend ID1300, Walbro 450 E85 (part #F90000267) pump, 12 gauge wires for the pump and the fuel pump relay relocated to the trunk.
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Originally Posted by soviet
(Post 1138628)
I recommend ID1300, Walbro 450 E85 (part #F90000267) pump, 12 gauge wires for the pump and the fuel pump relay relocated to the trunk.
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