575SCI throttle body upgrades??
02-25-2015 | 09:36 PM
#91
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Joined: Jul 2011
Posts: 9,594
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From: Ft. Worth TX
I hear you, the regulator sits / mounted on top of the fuel cooler which has a tiny hole and screen installed is the stock Merc GEN II cool fuel app.
Who's ECM are using to drive 8 injectors currently and the calibration, the MAP sensor input to the ECM has changed from the air density most definitely has increased thru the intake from your design especially compared to top mounted TBI ?
I totally understand this is a speed density EFI system. MAP sensor inputs controls a lot for ECM outputs and in return the injector pulse width. PW = open / close timeframes of the injector(s).
Very interesting project you have so great to see an improved version of the outdated set up. Good luck with it.
Who's ECM are using to drive 8 injectors currently and the calibration, the MAP sensor input to the ECM has changed from the air density most definitely has increased thru the intake from your design especially compared to top mounted TBI ?
I totally understand this is a speed density EFI system. MAP sensor inputs controls a lot for ECM outputs and in return the injector pulse width. PW = open / close timeframes of the injector(s).
Very interesting project you have so great to see an improved version of the outdated set up. Good luck with it.
Last edited by BUP; 02-25-2015 at 09:55 PM.
02-25-2015 | 10:16 PM
#92
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Joined: Jan 2004
Posts: 4,480
Likes: 43
From: Tennessee
We are using the existing Mefi 3 ecm and harness. I made an injector sub harness that will connect all of the injectors to a 4 pin plug. I will also supply the other end of that plug with about 8" of wire. All the customer will have to do is pull back the wire loom and cut the 3 injector wires and splice them to my harness. That will take care of the wiring changes. It should take all of about 5 minutes. All plugs are weather tight and the wire is tin coated.
I can supply a custom tune with the kit. I have the ability to tune all Mefi ecm's, as we use them on our custom built engines. The problem that I'm having is finding a stock engine so that I can get a good cal for it. All of the 575's that I'm seeing have already been modified to some extent. They have either had the cam and lifters changed to a hyd roller, had a pulley change, etc. A 575 with some custom parts, custom cam, higher boost, etc, will require a custom tune, but I have tuned quite a few of them so I have a number of different calibrations. Those will have to be done on a per engine basis. I will be able to get them a base cal if the customer wanted to tune it themselves or I would be more than happy to tune it.
Thank you BUP.
Eddie
I can supply a custom tune with the kit. I have the ability to tune all Mefi ecm's, as we use them on our custom built engines. The problem that I'm having is finding a stock engine so that I can get a good cal for it. All of the 575's that I'm seeing have already been modified to some extent. They have either had the cam and lifters changed to a hyd roller, had a pulley change, etc. A 575 with some custom parts, custom cam, higher boost, etc, will require a custom tune, but I have tuned quite a few of them so I have a number of different calibrations. Those will have to be done on a per engine basis. I will be able to get them a base cal if the customer wanted to tune it themselves or I would be more than happy to tune it.
Thank you BUP.
Eddie
02-28-2015 | 11:29 PM
#93
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Joined: Jan 2008
Posts: 2,357
Likes: 2
From: San Diego
We are using the existing Mefi 3 ecm and harness. I made an injector sub harness that will connect all of the injectors to a 4 pin plug. I will also supply the other end of that plug with about 8" of wire. All the customer will have to do is pull back the wire loom and cut the 3 injector wires and splice them to my harness. That will take care of the wiring changes. It should take all of about 5 minutes. All plugs are weather tight and the wire is tin coated.
I can supply a custom tune with the kit. I have the ability to tune all Mefi ecm's, as we use them on our custom built engines. The problem that I'm having is finding a stock engine so that I can get a good cal for it. All of the 575's that I'm seeing have already been modified to some extent. They have either had the cam and lifters changed to a hyd roller, had a pulley change, etc. A 575 with some custom parts, custom cam, higher boost, etc, will require a custom tune, but I have tuned quite a few of them so I have a number of different calibrations. Those will have to be done on a per engine basis. I will be able to get them a base cal if the customer wanted to tune it themselves or I would be more than happy to tune it.
Thank you BUP.
Eddie
I can supply a custom tune with the kit. I have the ability to tune all Mefi ecm's, as we use them on our custom built engines. The problem that I'm having is finding a stock engine so that I can get a good cal for it. All of the 575's that I'm seeing have already been modified to some extent. They have either had the cam and lifters changed to a hyd roller, had a pulley change, etc. A 575 with some custom parts, custom cam, higher boost, etc, will require a custom tune, but I have tuned quite a few of them so I have a number of different calibrations. Those will have to be done on a per engine basis. I will be able to get them a base cal if the customer wanted to tune it themselves or I would be more than happy to tune it.
Thank you BUP.
Eddie
03-02-2015 | 11:52 PM
#94
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Joined: Jan 2004
Posts: 4,480
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From: Tennessee
Well that sucks. Sorry to hear that.
However, since you change the blower, yours isn't stock anymore. That is a much better blower and I would be willing to bet that you are making more boost than a stock setup. That is what I keep running into. Everyone that I know that has a 575 has changed something....blower, pulley, cam, heads, etc. I would love to get my hands on a bone stock engine to put my injection on so that I can get a good tune on it. That way, if someone calls and wants a bolt on deal for a stocker, I'll have them covered. Guys with modified engines expect to have to do some type of tuning. Guys with stockers want to bolt something on and go.
Sorry about your engine. Let me know if I can help in any way.
Eddie
However, since you change the blower, yours isn't stock anymore. That is a much better blower and I would be willing to bet that you are making more boost than a stock setup. That is what I keep running into. Everyone that I know that has a 575 has changed something....blower, pulley, cam, heads, etc. I would love to get my hands on a bone stock engine to put my injection on so that I can get a good tune on it. That way, if someone calls and wants a bolt on deal for a stocker, I'll have them covered. Guys with modified engines expect to have to do some type of tuning. Guys with stockers want to bolt something on and go.
Sorry about your engine. Let me know if I can help in any way.
Eddie
03-04-2015 | 07:19 AM
#96
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Joined: Nov 2005
Posts: 2,399
Likes: 15
From: Toronto, Canada
The FAST throttle bodies that you are talking about will work great. The problem with the stock setup is that not only will you start to run out of injector around 750 hp, but you also have the injectors sitting right in the venturi to disrupt the airflow. I have seen a few guys swap over to the FAST setup and they seem to work great.
Another route is to put together your own setup. You can buy an injector plate like shown in the kit above. I wouldn't use the injector hat setup. Tip in (just off idle) is really tough to control. THat's 3 really big holes that open at once. It's almost an all or nothing deal. It makes docking fun
All you need is an injector plate like shown, a side saddle carb adapter, 2 1000 cfm throttle bodies, injectors, fuel pump, regulator and some plumbing.
Or, if you are handy, you can make the injector plate and fuel rails yourself. When I need one to hold 10 or 12 injectors, we just make them. No one offers one with anything other than 8 injectors, so we made our own. It's not really that hard. It just takes some time.
Let me know if I can help in any way.
Eddie
Another route is to put together your own setup. You can buy an injector plate like shown in the kit above. I wouldn't use the injector hat setup. Tip in (just off idle) is really tough to control. THat's 3 really big holes that open at once. It's almost an all or nothing deal. It makes docking fun
All you need is an injector plate like shown, a side saddle carb adapter, 2 1000 cfm throttle bodies, injectors, fuel pump, regulator and some plumbing.Or, if you are handy, you can make the injector plate and fuel rails yourself. When I need one to hold 10 or 12 injectors, we just make them. No one offers one with anything other than 8 injectors, so we made our own. It's not really that hard. It just takes some time.
Let me know if I can help in any way.
Eddie
03-04-2015 | 07:23 AM
#97
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Joined: Nov 2005
Posts: 2,399
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From: Toronto, Canada
I hae one completed. I haven't had a chance to run it on an engine yet, as I don't currently have one. Instead, I decided to take the time to digitize the injector plate on the CNC so that I can make several of them. I am hoping to have a few made in the next couple of weeks. Here is a pic of it with the harness installed on it.
Let me know what you think.
Eddie
Let me know what you think.
Eddie
03-04-2015 | 09:51 AM
#98
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Posts: 4,480
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From: Tennessee
It's not idle that's the issue. It's right off of idle. We actually use dual IAC's in most SC applications. With a bird catcher, you have 3 massive holes that open all at once. It's not progressive like most setups. It can certainly work, but just off idle at throttle tip in is where it gets pretty aggressive. If you have to give it a little throttle when docking, it's hard to just ease into it.
03-04-2015 | 09:53 AM
#99
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From: Tennessee
The Mefi will only batch fire. We are trying to keep it as simple as possible. I want it to be a bolt on deal for the average guy. Not only that, I'm trying to keep the cost down as much as I can.
03-04-2015 | 10:58 AM
#100
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Posts: 2,399
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From: Toronto, Canada
It's not idle that's the issue. It's right off of idle. We actually use dual IAC's in most SC applications. With a bird catcher, you have 3 massive holes that open all at once. It's not progressive like most setups. It can certainly work, but just off idle at throttle tip in is where it gets pretty aggressive. If you have to give it a little throttle when docking, it's hard to just ease into it.
