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Author Topic: Crome fuel injector sizing question. (beware wall of text )  (Read 5127 times)

92CXyD

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Crome fuel injector sizing question. (beware wall of text )
« on: April 23, 2010, 10:30:34 AM »

Management setup:

Crome 1.5.3
75# Delphi Injectors
225LPH fuel pump (intank)
Boost-a-pump MSD 2351 (Digitally raises the fp voltage linearly with boost pressure)
Autometer/Dynojet Commando WB gauge w/ bosch 17014 wb O2 sensor.
Ebay Electronic Fuel Pressure Gauge.

The fuel pressure registers 50-52psi at idle and under load (No supercharger, strictly N/A)

I have the fuel injector size in Crome as a 788cc inj. size and 1612cc engine size in the multiplier calculator (Crome).

Using http://www.rceng.com/technical.aspx I plugged in 50 psi pressure and 788 original inj. size and get ~845cc.

So do I just plug in 845cc inj. size and 1612cc engine size again and the program automatically change everything?

Or do I just play with the injector size only in the multiplier calculator in Crome?

And does this matter that much on my WB gauge?

The WB sits at 10.5:1 until I get the engine under a load and it pegs out at past 22:1 and then if I cruise it goes back down to 10.5:1 sometimes 11:1.

I have an AEM wb Gauge with the supplied sensor I could use and see if this makes a difference in readings.

Looking at the plugs, and exhaust it runs a very rich at idle.

I have a Hulog but since I do not have Crome Pro I can not datalog so I'm relying on my gauges for info.


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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #1 on: April 23, 2010, 02:36:06 PM »

i would just adjust all settings in crome and leave FP at around stock levels.  I use FPR's for fine tuning or if i need to just richen/lean up across the map. 
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92CXyD

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #2 on: April 23, 2010, 02:48:42 PM »

i would just adjust all settings in crome and leave FP at around stock levels.  I use FPR's for fine tuning or if i need to just richen/lean up across the map. 

I did nothing w/ fuel pressure I only upgrade the fuel system.

Still using stock fuel regulator.

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #3 on: April 23, 2010, 04:00:44 PM »

He's referring to the boost a pump, do you really need that?
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92CXyD

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #4 on: April 23, 2010, 04:12:54 PM »

He's referring to the boost a pump, do you really need that?

No but I got it at a good price and it is only running the fuel pump at 13.5 to 14 volts. (stock voltage but stable)

I have not put the S/C back on yet.

I wanted it to be there when I go fuel twincharge as added insurance from getting my fuel system failing at 30psi.

Plus the program for the boost-a-pump give temps of pump, amp draw, voltage from fuel relay, voltage output to the fuel pump and I like extra info. to look at when I attempt to tune my car. ;D

I'm just trying to get the n/a street tuning done while I wait for some machine time at my foundry to make my inlet and outlet manifolds for my s/c. ;D

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #5 on: April 27, 2010, 03:54:43 AM »

Does it actually still pull when you're wb is reading 22:1??? if so then the WB is obiously not correct.
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92CXyD

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #6 on: April 27, 2010, 09:37:15 AM »

Does it actually still pull when you're wb is reading 22:1??? if so then the WB is obiously not correct.

Yeah it still pulls. I'll switch WB or troubleshoot the one I have in the car now.

All after I get another motor in hopefully this week. ;D

d112crzy

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #7 on: April 27, 2010, 11:29:23 AM »

Something is off with your wideband if its only reading rich or lean.

Get rid of that boost a pump, you won't need it. Sell it and get a walbro. KISS
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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #8 on: April 27, 2010, 11:49:16 AM »

He's referring to the boost a pump, do you really need that?

BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH


Plus the program for the boost-a-pump give temps of pump, amp draw, voltage from fuel relay, voltage output to the fuel pump and I like to overcomlicate things


BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH BLAH
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92CXyD

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #9 on: April 27, 2010, 12:13:46 PM »

Something is off with your wideband if its only reading rich or lean.

Get rid of that boost a pump, you won't need it. Sell it and get a walbro. KISS

Already have a walboro in the tank. ;D

And since the boost a pump was helps with consistent voltage then I will keep it.

Yeah I do overcomplicated thinks. :?:

But I like installing things to learn from.

I think it is my WB.

So I'm changing to the AEM WB I have one laying around and see if it is any better.

I'm also checking the wiring for the Autometer/Dynojet WB and make sure I have good ground and power.

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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #10 on: April 27, 2010, 12:20:08 PM »

Something is off with your wideband if its only reading rich or lean.

Get rid of that boost a pump, you won't need it. Sell it and get a walbro. KISS

Already have a walboro in the tank. ;D

And since the boost a pump was helps with consistent voltage then I will keep it.

Yeah I do overcomplicated thinks. :?:

But I like installing things to learn from.

I think it is my WB.

So I'm changing to the AEM WB I have one laying around and see if it is any better.

I'm also checking the wiring for the Autometer/Dynojet WB and make sure I have good ground and power.


Damn dude, you just don't learn do you? Keep shit simple and it will work. Add mulitple needless bullshit, well go look at UI's thread.

If you want to keep voltage stable, ground your ecu/motor properly and rewire your fuel pump as well.
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Re: Crome fuel injector sizing question. (beware wall of text )
« Reply #11 on: April 27, 2010, 12:27:21 PM »

I have rewired the fuel pump using the Boost-a-pump wiring.  ;D

I will have this car running again I'm not too worried. I like the challenge.

I have the ecu and motor grounded well. But I have the WB grounded at the thermostat housing stacked on top of harness ground.

I just need to clean up the surfaces and run my extra ground cable to that area instead to the distributor mount.

I like your guys concerns. I like doing things different.
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