1300 or 2000cc Injector dynamics and precision 600 or vibrant 550hp intercooler
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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Thread Starter
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Joined: Aug 2009
Posts: 50
Total Cats: 1
From: Sun Prairie WI
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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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.
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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 **** out and 2) your pump isn't keeping up.
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 **** out and 2) your pump isn't keeping up.
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Answered in post 63: between 11:1 and 12:1. That's a little rich for E85, but not excessively so, and not enough to solve the problem.
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Thread Starter
Junior Member
Joined: Aug 2009
Posts: 50
Total Cats: 1
From: Sun Prairie WI
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.
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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.
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.
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heeeey loooook
Hydra is a piece of ****
the sky is blue
https://www.flyinmiata.com/support/i...ECU_Tuning.pdf
Hydra is a piece of ****
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.
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heeeey loooook
Hydra is a piece of ****
the sky is blue
https://www.flyinmiata.com/support/i...ECU_Tuning.pdf
Hydra is a piece of ****
the sky is blue
https://www.flyinmiata.com/support/i...ECU_Tuning.pdf
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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.
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Thread Starter
Junior Member
Joined: Aug 2009
Posts: 50
Total Cats: 1
From: Sun Prairie WI
That is true. However, at this point I have no clue how close I am to actually reaching true 100% If you say I don't need to worry about it that's great. However, I'm uneasy about not knowing true 100%. If I didn't already have the Hydra I would have done a megasquirt yrs ago. It has issues I know. I also want some room to move. Since, I'm sure my fuel system is ok after double checking and know one has said otherwise yet after posting last nights info. What injectors do I need to make 500+RWHP? Is a vibrant 550hp intercooler going to be large enough for heat soak issues during track sessions? Or soni need to go larger?
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For 500whp, this is what you want. Use the factory fuel pump relay to trigger a dedicated 25A relay with 12awg wires straight from the battery.
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