quick fuel question
Legend
Joined: Jul 2004
Posts: 9,606
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From:
RE: quick fuel question
ORIGINAL: RadarLove
Mustang injectors work fine. Automakers don't make injectors. Kinda like Dell doesn't make microchips.
You don't need to go to bigger injectors unless you are putting out 225-250 HP, which you aren't going to do naturally aspirated on your 2.0L. To be honest, the mods you have right now probably didn't get you any power. Skip the injectors until you actually need them.
If you run bigger injuectors, the PCM doesn't know. All it does is check O2 sensor readings in closed loop (normal driving) and adjust pulse width to maintain a 14.7 a/f ratio. In open loop (wide open throttle or idle, for example), it has a default setting and doesn't pay attention to the O2 sensor. So it's opening the fuel injectors as if you had the stockers in there, so you are getting an extra 26% fuel in the cylinders. Since the Neon already runs rich, you are now running stupid rich, and the car will be slower. To fix this, you need to find some way to control fuel flow in all situations. The most common approach is with an aftermarket fuel pressure regulator. Better still is a complete engine management system like Megasquirt. How you go about setting it up depends on what sort of forced induction you go with (turbo or nitrous). Either way, you should spend plenty of time on a dyno getting it right if you want the engine to last.
Best of luck!
Mustang injectors work fine. Automakers don't make injectors. Kinda like Dell doesn't make microchips.
You don't need to go to bigger injectors unless you are putting out 225-250 HP, which you aren't going to do naturally aspirated on your 2.0L. To be honest, the mods you have right now probably didn't get you any power. Skip the injectors until you actually need them.
If you run bigger injuectors, the PCM doesn't know. All it does is check O2 sensor readings in closed loop (normal driving) and adjust pulse width to maintain a 14.7 a/f ratio. In open loop (wide open throttle or idle, for example), it has a default setting and doesn't pay attention to the O2 sensor. So it's opening the fuel injectors as if you had the stockers in there, so you are getting an extra 26% fuel in the cylinders. Since the Neon already runs rich, you are now running stupid rich, and the car will be slower. To fix this, you need to find some way to control fuel flow in all situations. The most common approach is with an aftermarket fuel pressure regulator. Better still is a complete engine management system like Megasquirt. How you go about setting it up depends on what sort of forced induction you go with (turbo or nitrous). Either way, you should spend plenty of time on a dyno getting it right if you want the engine to last.
Best of luck!
Legend
Joined: Feb 2006
Posts: 9,284
Likes: 1
From: mendota, illinois
RE: quick fuel question
the underdrive pully isnt hard to get to. take off the passenger tire, then remove the splash guard(if it has one). just make sure that you dont use a cheat puller to get it off. the pulley will more or less weld itself to the crank over time. i broke 8 cheap pullers trying to get mine off, till i found a snap on puller ment for the car on ebay for 60 bucks.
Record Breaker
Joined: Mar 2005
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RE: quick fuel question
The stock injectors used on the 8-cylinder Mustangs are the same as the ones used on a stock 2.4L Caravan, cloud car, or PT Cruiser. The difference is that you can grab a set of 8 for not much more than it costs for a set of for. Neon owners are cheap, that's why we do things like that...
I considered getting the new Mustang GT (my brother has one now). Going with the RX-8 instead... I like to turn too much
I considered getting the new Mustang GT (my brother has one now). Going with the RX-8 instead... I like to turn too much
Rookie
Joined: Jan 2006
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RE: quick fuel question
OK I've been looking around the megasquirt site and want to know will my car still pass the OBDII emistions test here in NY state?
All cars 96 and newer have to hook to the computer to pass I havent been able to find this info on the Megasquirt site.
I was looking at going fuel only control, anyone know about this? Is it still compliant?
Till then im gonna put the stock injectors back in and see what it does for me as far as the to-rich code im getting now.
All cars 96 and newer have to hook to the computer to pass I havent been able to find this info on the Megasquirt site.
I was looking at going fuel only control, anyone know about this? Is it still compliant?
Till then im gonna put the stock injectors back in and see what it does for me as far as the to-rich code im getting now.
Record Breaker
Joined: Mar 2005
Posts: 1,205
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From:
RE: quick fuel question
If you use MS for full fuel and spark control, you'd have to switch back to a stock setup to pass the OBD-2 scan... If you use it for only spark, it's just a matter of hooking the injectors back up to the stock harness (you'll have a CEL with the MS controlling, and you'll want to switch back a couple hundred miles before the test, they can tell when a PCM's been reset and will fail you for it...).
