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Old 12-16-2014, 08:09 PM   #1
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Default 1.6 Greddy Turbo Fuel Questions

So I did some research and it seems that the stock fuel pump with an aftermarket ECU can run up to 300whp with the stock regulator.
But just with common knowledge of boosted cars (I've been with 240's for 4-5 years and been through a few boosted setups) stock pumps don't go very far.

My plans were to use my greddy turbo kit that's stuck at 5psi and up the boost till I'm close to 200whp.
Now my plans for fuel were a 255lph walbro pump, 550cc tan RX7 injectors, an Aeromotive FPR, and all controlled by my MS2.

But after researching I'm under the assumption that if I keep my stock injectors, FPR, and stock pump I with MS2 I can get enough fuel up to 300whp?
Or is that with a stock pump, stock FPR, but bigger injectors?

So the real question is can I just run 550cc injectors on my stock FPR and fuel pump and safely reach my 200whp goal and not worry about the pump?
Or should I shell out for the walbro and aeromotive FPR?
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Old 12-16-2014, 08:11 PM   #2
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Larger injectors is all you need. I reached 200rwhp with 350cc injectors with room to spare. Those 550s are more than enough.
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Old 12-16-2014, 09:26 PM   #3
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No need for the pump or FPR. Leave those stock. With a standalone ECU all you need for your power goals is injectors.

My stock pump went bad at some point so I swapped it for a Walbro, but it isn't actually needed. Doing 215-ish whp for years on 460cc injectors controlled by megasquirt on stock FPR and fuel rail.

-Ryan
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Old 12-17-2014, 11:20 AM   #4
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Our stock regulator is a tried and true unit that keeps base fuel pressure at 43.5psi, very reliably. That's not asking much of the pump, so as other say the stock one will work fine.

Once you get to using a decent duty cycle percentage of a 1000cc injector, they start emptying out the fuel rail with every pulse. Or at least start to desire more. That's when a larger fuel rail, pump, feed lines, and higher pressures might come in handy.

Absurdflow's fuel rail is still droll worthy:

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Old 12-17-2014, 12:24 PM   #5
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Quote:
Originally Posted by curly View Post
Once you get to using a decent duty cycle percentage of a 1000cc injector
Just so you're not confused, maxing out a 1000cc injector is WAAAAYYYY above 200rwhp.
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Old 12-17-2014, 12:29 PM   #6
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I've seen stock pumps give up at 200whp and I've seen them stretch to 220-230whp. The FPR is only necessary if you want to increase the base fuel pressure or control a much larger (Walbro 255, DW300 or larger) fuel pump. For 200whp, stick with the stock pump (unless it's weak) and the stock FPR. Injectors are required at 200whp no matter what.
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Old 12-17-2014, 02:10 PM   #7
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Quote:
Originally Posted by hornetball View Post
Just so you're not confused, maxing out a 1000cc injector is WAAAAYYYY above 200rwhp.
Yeah, what he said.

My point was you need to max out 1000cc injectors at 500ish hp before the rail, pump, and/or FPR need to be looked at, assuming they're in good working condition.
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